AC Motor Repair Specs

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N W I B R

T

AC MOTORS REPAIR SPECIFICATION

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 NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

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AC MOTORS R EPAIR  EPAIR  S  SPECIFICATION  ABLE  OF  C  ONTENTS  T   C ONTENTS  DATED: 3/1/99 Revision 8/16/05

 1.  2.  3.  3.  4.  5.  6.  7.  8.  9. 10. 11. 12.

Overview Definitions Pre-Repair Activity and Responsibility User Responsibility R Reepair Facility Responsibility Incoming Inspection Disassembly Procedures and Instructions Repair Procedure Balancing Electrical Connection Fits Assembly

13. Run Test Standard 14. Painting 15. F Fiinal Inspection and Shipping Preparation 16. Shipping Precaution 17. Field Repairs Appendix A – AC Motor Incoming Check List Appendix B – AC Motor Data Summary Appendix B1 – Failu Failure re Analysis Cause Codes Appendix C – Mechanical Inspection for Motor as Received Appendix D – AC Motor Strip Report Appendix E – AC Motor Repair Report Form

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Appe Ap pend ndiix F – M Mec echa han nic ical al nspe fror Moto rs aass Co Com mplete leted d BaIlns anpect cictio ngion Cnefor tifiMo catetors

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Appedata ndisuch x G as – Dynamic This website stores cookies to enable essential site functionality, as well as marketing, personalization, and analytics. You References may change your settings at any time 1. IEEE Std 43-2000 or accept the default settings. 2. IEEE Std 1068-1996

3. NEMA MG 1-2003 Rev.1-2004 Rev.1-2004 4. ISO 8821-1989(E) Privacy Policy 5. ISO 18436-2 Marketing 6. ISO 9921 7. ISO 1940/41 Personalization Analytics Save

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345 East 47th St, New York, York, NY 10017 th 345 East 47  St, New York, York, NY 10017 2101 L St NW Suite 300, Washin ashington, gton, DC 20037 1 rue de Varembe, 1211 Geneva 20, Switzerland 1 rue de Varembe, 1211 Geneva 20, Switzerland 1 rue de Varembe, 1211 Geneva 20, Switzerland 1 rue de Varembe, 1211 Geneva 20, Switzerland

 NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

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 NWIBRT AC MOTORS R EPAIR  EPAIR  S  SPECIFICATION Revised: 8/16/05 1.0 – Overview 1.1 – Mission

This recommended practice covers general recommendations for the repair of AC electric motors and includes includes recommendations forthe both the User andinstruction the Repairbook Facility Facility. is not intendedagreement to supplant specific instructions contained in manufacturer's or .inItany contractual  between a manufacturer manufacturer and a purchaser of a given given machine. machine. These recommendations apply to horizontal and vertical motors, NEMA frame size 140 and above, having a voltage rating of 15 kV or less. These recommendations apply only to the repair rep air of motors and are not intended to cover major modification modifications. s. Excluded from the scope of this recommended practice are the following: •

Specific requirements, certification, and inspection required for listed explosionproof and dustignitionproof machines.



Any specific or additional requirements for hermetic motors, hydrogen-cooled machines, submersible motors, or Class IE nuclear service motors.

The use of this recommended practice by Users and Repair Facilities is expected to result in higher quality, quality, more cost-effective cost -effective and timely timely repairs. It also provides a means of evaluating repairs aand nd facilities. 1.2 – Purpose

This recommended practice is intended to be a basic or primary document that can be utilized and referenced by owners of motors that need repair as well as by owners and operators of establishments that offer motor repair re pair services. It has been developed primarily for the needs of the NWIBRT NWIBRT,, but can  be adapted to other applications. applications. 2.0 – Definitions 2.1 – Major Modifications: Include conversions from one type of machine to another type of

This website stores data such machine, mach ine, conversion conversi on as from one type of enclosure to ano another ther type of enclosure, or o r conversion from one cookies rating to enable essential site to another rating. functionality, as well as marketing, Motor: You A rot rotating ating machine that converts electrical elect rical energy into mechanical energy or personalization, 2.2 and –analytics. may change your settings at into any time mechanical energy electrical energy. energy. As used in this recommended practice, pra ctice, the term t erm can also be or accept the default settings. used to mean an alternator. alternator.

2.3 – Repairs:  Include incoming incoming inspection inspection and test, damage appraisal, cleaning, replacement Privacy and/or Policy repair of damaged part(s), assembly, post-repair inspection and test, and refinishing. Marketing2.4 – Repair Facility:  The entity contracted to make repairs; inclu includes des the “on site” repair(s) repair(s)

made by employe employees es or subcontractors of that entity in in addition to repair(s) made at a shop operated o perated by or under the supervision of that entity.

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2.5 – User: The owner of the motor or an authorized agent of the owner 3.0 – Pre-Repair Activity and Responsibility Save Accept All

Several items items should should be considered considered and documented prior to repairs. Indeed, some pre-

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qualification activities should be finished qualification finished prior to failure or shipment to a Repair Facility Facility.. Some of these activities are the responsibility of the User, while others are assigned to the Repair Facility. 4.0 – User Responsibility

In order for the repair to be of high quality and cost effective, the User should prepare in advance to schedule and make the motors available for pick up. Special rigging (lift (lift truck or cran crane) e) will will be  provided at the User’s site site to transport t ransport and set the equipment to be repaired on (pickup) and of offf (delivery) the Repair Facility’s transport vehicle.   4.1 – Records The User should furnish sufficient manufacture and previous repair information to aid the Repair Facility to make the th e best failure investigation investigation and repair rep air plan. For example, at times the nameplate will not be readily readable after several years in service, and pertinent data must be obtained largely by measurements. measure ments. It would be ideal if if the User would keep a record of the namepl nameplate ate and other moto motorr information in a file along with any data such as failure history, bearing replacement, and other problems and repairs. This record would then be furnished to the Repair Facility Facility,, if available. available. Records Recor ds are to be stored by the User and Repair Facility for a minimum of 10 years. 5.0 – Repair Facility Responsibility  

As a minimum, the Repair Facility shall comply: ISO-9000 Quality Certification required Only Class “F” or “H” or better materials, as a total insulation system, shall be used. All materials used for repair shall be new. Any reused parts shall be approved by the User and completely reconditioned, and Records shall be archived by the Repair Facility for a minimum of 10 years. 6.0 – Incoming Inspection

A thorough appraisal of the motor’s condition, as received, is essential for the following purposes: •

To determine what specific repairs are needed. (The motor may have been sent to the Repair Facility with limited external evidence as to the nature and location of trouble. What seems wrong may be correctable in several ways.)

This website stores data such as • To find find unsuspected trouble, perhaps unrelated to the obvious defect. cookies to enable essential site functionality, as well as marketing, • To diagnose cause and effect effect to help prevent a recurrence. personalization, and analytics. You may change your settings at anyshould time include a complete review of the following conditions of each part of the This appraisal or accept the default settings.

motor:

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General cleanliness



Cracked or broken welds or castings

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• • •

Wear or rub marks, including fretting Discoloration, Discolorat ion, charring, or other evidence evidence of overheating

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Looseness at mating fits

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Corrosion, moisture, or oil inside the machine

Photographs of any abnormal conditions found are strongly recommended as part of the appraisal  process and inspection inspection report. In the absence of clear clear photographs, all drawi drawings, ngs, diagrams, diagrams, or descriptions shall allow no uncertainty as to the location loca tion of the conditions described. If references are made to “clock position” or to ends of the machine machine (e.g., “inboard” or “outboard”), “ou tboard”), some explanatory note or sketch sketc h should make clear the location being described. The terms “drive “drive end” and “opposite “oppo site drive end” are recommended for horizontal shaft machines, “top” and “bottom” for vertical shaft units. Prior to unloading unloading the motor, moto r, it should be inspected for obvious damage that may have occurred during shipment. A. A receiving receiving report should be fil filled led out and include include broken or missing missing parts and/or any unusual problem(s); include photos. B. For conditions that cannot cannot be adequately described, described, pi pictures ctures should be be taken for clarity clarity.. C. Record all motor nameplate nameplate informatio information n availab available le on Appendi Appendixes xes B, D, and E as applicable. 6.1 – Incoming Tests Tests

Prior to an incoming run test, perform the following and record information where appropriate: A. Motor must be mechanic mechanicall ally y inspected inspected to determine determine if shaft shaft turns freely freely. B. Verify erify that that bearings bearings are lubri lubricated. cated. C. Insulation Insulation resistan resistance ce tests should be performed. performed. (See Section 8.1, I through L for minimum insulation resistance values, temperature compensation requirements, and test voltages.) See Appendixes Appendixes A and and E for a motor data insulation insulation resistance resistance record form. D. Other tests required before energizing energizing the motor are as follows: 1. Continuity of stator windings 2. Condition and installation of brushes, if applicable 3. Single-phase, Single-phase, low-voltage test tes t (approxim (appr oximately ately 10-20% of rated voltage) v oltage) on AC squirrel-cage rotor to find defective rotor bars—maximum accepted line current This website stores data such as  variation variation <3%, as the shaft shaft is is rotated with full-load full-load current applied applied per IEEE cookies to enable essential site Std. 1068-1996 functionality, as well as marketing, 4. Polari P olarization zation index (where appropriate) personalization, and analytics. You 5. Surge test (where appropriate) may change your settings at any time or accept the default settings. E. If conditions conditions permit, the motor should be run at reduced voltage init initial ially ly (25 -

50% of rated voltage). If the test is successfu successful, l, complete the data sheets in Appendixes A and C, and then run the motor at full voltage, if possible.

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F. The intent of the “As Received”, Received”, no load, run test is to get the motor operating safely safely up to top speed for electrical characteristic characteristics, s, bearing temperature, and vibration Personalization checks prior to disassembly. disassembly. If the “A “Ass Received” motor conditions permit, the motor shalll be run to 100% speed for these tests. (See Run Test, shal Test, paragraph 13.0 and 13.3.) Analytics Complete the data sheet in Appendix A. Marketing

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7.0 – Disassembly Procedures and Instructions

A. Before any disassembly disassembly is begun, parts part s should be marked (i.e., brackets, brack ets, frame, covers, and

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brush holders). B. Brackets and bearings bearings should should be be identif identified ied as as pairs. pairs. C. Check Check and record rotor air air gap gap (Append (Appendix ix B). D. Frame-mounted Frame-mounted devices devices should should be identifi identified ed and recorded.

 

E. Wiring iring should should be recorded, sketched, and marked marked before disconnecting disconnecting (for (for external connection). F. Before removing removing the coupling coupling or other shaft-mou shaft-mounted nted components, measure and record their  their    position with respect respec t to the end of the shaft (flush, past flush, or from flush). Critical components may need to be match marked for reassembly (Appendix C). G. Visually isually check check fan blades for damage and and cracks. When necessary use a penetrating dye   system. Any damaged fan should be replaced. H. As parts are removed, record all all noted damage damage or special special markin markings. gs. I. Check shaft extension extension runout complia compliance nce with original original motor specif specification ications. s. If other information is not available, use the following: AC motor runout = 0.001 inch tot total al indicator reading taken within 0.25” from the end of the shaft

 

J. Visually isually check for evidence evidence of rubbing rubbing at outside diameters diameters (fan, (fan, shrouds, end end rings, rings, armature laminations, etc.). K. If possible, check for tightness of the core on its shaft. Visually inspect for signs of axial and   radial movement. L. Vi Visually sually check rotating rot ating components componen ts for excessive heating and other abnormalities. 7.1 – Motor Inspection

Inspect condition of bar joints, end rings, windings, slip rings, key ways, threaded fits, synchronous syn chronous pole pieces, etc. (Note: Complete Appendi Appendixes xes B and C.). A. Measure and record dimensions of the following following (Appendix C):

This website stores data such as 1) Shaft extension cookies to enable essential site 2) Journal and bearing fits functionality, as well as marketing, 3) Shaft personalization, and analytics. Youextension runout 4)atShaft seal fits may change your settings any time 5) Collector ring diameter  or accept the default settings.

6) Brush size and type of quantity B. Visually inspect the condition of non-rotating non-ro tating components componen ts (brackets, baffles, baffles, shrouds, brush Privacy Policy holders, brushes, gasket, spacers, shims, threaded fits, machine fits, feet, etc.). MarketingC. Measure and record bracket fits fits for housings, cartridges, and beari bearings ngs (Appendix (Appendix C). Personalization D. Visually inspect the condition of ball or roller bearing housing or cartridg cartridges es (wear, grooving, gro oving,

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seal fits, fretting, grease fitting, insulation, oil gages, etc.). etc. ).

E. Visually inspect the condition co ndition of sleeve bearings while while still still in brackets ((wear, wear, oil grooves, grooves , Accept All oil rings, seals, insulation, seal fit, bracket ware, dowels, parts, etc.). F. Visually inspect stator stat or laminations, mounting blocks, welds, machined fits, brush rigging, rigging,

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space heaters, etc. G. Visually inspect rotor rot or pole pieces, mounting blocks, amortisseur windings, lleads, eads, etc. H. When inspecti inspecting ng squirrel-cage squirrel-cage rotor bars and their their connecting end rings rings inspect inspect for cracks, arcing in in slots, slots, and for cage migration. migration. All cracks and evidence of arcing should be recorded recorde d and, if possible, pictures should be taken showing the location of damaged bars or end rings. A drawing should be made showing the defective bar location, and all connecting parts

   

 between poles and end rings rings should should be identif identified ied and recorded on the drawing. I. Damage appraisal of motor moto r components componen ts is divided into two categories, categ ories, electrical and mechanical. J.  A strip report shall be sent to User for approval prior to starting repairs (Appendix D).

8.0 – Repair Procedures 8.1 – Electrical

Stator Sta tor Windings. Windings. Observe the following: A. Slot wedges (“top sticks”) sticks”) that are loose, damaged, damaged, or have shift shifted ed in position B. Ties, las lashi hings ngs,, or blocki blocking ng that are loose loose or broken C. Dirt, Dirt, oil, oil, or moisture moisture deposited deposited on coil coil surface surfacess D. Coil damage – Besides Besides obvious burnin burning, g, tracking, or charring, charring, look for loose or cracked tape, coils that have moved within the slot, deposits of dirt or chemicals, and insulation pitted or worn away by airborne abrasive particles. If severe arcing or  burning  burni ng has taken place, inspect inspect the entire un unit it interior careful carefully ly for globules globules or fragments or molten copper that may have been projected from the failed winding. Windings of motors rated 5 kV and above that have slot partial discharges will have evidence evide nce white or gray powder on o n the surface. E. On lead lead cables, cables, straps, straps, and bus work, look for cracked, cracked, overheated overheated,, or fraye frayed d insulation, and loose or burned terminal lugs. F. When a winding winding shows clear clear evidence evidence of destructive arcing arcing or overheating, overheating, observe

This website stores data such as record carefully and ca refully the location and nature of the damage. If all all coils coils appear equally cookies to enable essential site overheated, likely causes are ventilation failure, under-voltage, stalling, or prolonged functionality, as well as marketing, overload. overloa d. If coils within one phase are largely largely undamaged, the likely causes are singlepersonalization, and analytics. You  phase operation or serious voltage unbalance. unbalance. If only only certain co coils ils adjacent to line line may change your settings at any time leads have been damaged, especially with relatively little heating, the likely cause is a or accept the default settings.

transient transie nt surge voltage on the feeder circuit.

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G. Be alert also for evidence evidence of insulation insulation damage damage caused by flyi flying ng objects such as broken fan blades blades within the motor. moto r. The impact will will typically typically gouge goug e down to bare copper copp er without any burning unless adjacent turns become short-circuited and failure  progresses. H. Pay close close attention, whether whether or not winding winding damage is apparent, to all stator ventilating passages. These can be blocked blocked by varnish varnish or contaminants even when a winding looks fairly clean on the surface.

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If no stator winding damage is apparent, test the insulation resistance for windings using usin g a megohmmeter megohmmeter in accordance with IEEE Std 43-2000. Record the value of

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insulation resistance (IR) between the winding (all leads connected together) and the stator core. c ore. Test voltage, applied for one minute, minute, should should be as follows: follows: Rated motor voltage 240/480 2400 3000 – 4800 5200 – 13800

Megohmmeter test voltage, DC 500 1000 2500 2500 or 5000

J.

If the measured insulation insulation resistance resistance corrected to a reference of 40°C is not at least equal to 1 MΩ per 1000 V of motor nameplate rating plus plus 1 MΩ, the winding should  be thoroughly dried dried and the test then repeated. Drying Drying out temperature of the winding winding should not exceed 80°C as measured by thermometer.

K.

To correct IR readings to the referenc referencee temperature, use the formula found in IEEE’s IEEE’s Std 43-2000. R c = K t x R t Where R c = Insulation resistance (in megohms) corrected to 40 °C R t = Measured insulation resistance (in megohms) at temperature t  K t = Insulation resistance temperature coefficient at temperature  t  Obtain K  from  from Figure Figure 1 in IEEE Std 43-2000. 43-200 0.

L.

Windings in apparently good condition should receive a DC Overpotential Test (HIPOT) for one minute at a voltage T  calculated  calculated as follows: (Record (Reco rd microamps microamps on Appendix B.) (HIPOT to be requested by User User.) .) T = 0.65 (2Em + 1000 V)(1.7) Volts

  Where  E m  = Rated motor nameplate nameplate voltage M.

480V = 2166 VDC 2400 V = 6409 VDC

If these tests are not passed, the Repair Facility should discuss the results with the User to arrive at a decision decision to rewind or to attempt further reconditioning reconditioning and retesting.

 N. Inspect the stator core c ore structure itself careful carefully ly for for evidence evidence of severe corrosion, core

This website stores data such as shifting, local overheating of laminations, loose or broken slot teeth, loose or broken cookies to enable essential site finger finger plates, core blocki blocking, ng, loose or shifted shifted vent spacers, or rub marks from contact functionality, as well as marketing,  byYou the rotor or material material caught in the air gap. A Core Loss Test Test should be performed performed personalization, and analytics. the condition of the laminations. may change your settings at to anyevaluate time or accept the default settings.

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O. The rotor is the second major electrical electrical component to be appraised. Cleanli Cleanliness, ness, laminatio lam inations, ns, vent spacers, slot tooth condition, and rub marks are checked as in the stator. stat or. Rotor Rot or laminations laminations should should be checked for “coning” (separation (separa tion of lami laminations, nations, causing the length of the rotor to be greater at the outer diameter than it is at the shaft).

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A squirrel-cage squirrel-cage rotor will be the type most often encountered. It may use a cage-bar and end ring structure that is cast in place using aluminum alloy, a fabricated aluminum  bar and ring ring assembly assembly,, or a fabricated copper alloy cage. Whichever Whichever the type, using using a dental Accept All mirror if necessary, inspect all accessible surfaces of bars and end rings, looking for “blued” (overheated) areas, cracks, missing pieces, bar movement in the slots,  porous or deteriorated brazed or welded joints, and bars that have “li “lifted” fted” outwards in

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the slots under centrifugal centrifugal force. If rotor bar/and ring irregular irregularities ities are suspected, the fabric banding hiding the bar to end ring joints should be removed for inspection if needed. Record the location and nature of all defects found. Q. When overheated overheated or melted melted bars are present, the most severe damage wil willl typical typically ly be at the ends of the rotor, outside the core stack, when starting duty is the source of trouble. tro uble. If running running overload or blocked ventilation is is the problem, rotor roto r damage is more likely to be within the core stack itself. R. Look for evidence evidence of arcing arcing or burning burning along along the edges of bars adjacent to slots. This generally indicates bar looseness. S. One or more more cracked or broken cage bars normally normally dictate replacement replacement of the entire cage. If the rotor cage cag e requires replacement, aluminum or aluminum alloy cages should be of low copper content (0.2% or less). Copper or copper coppe r alloy alloy cages should should use metal joining joining material that is phosphorus phospho rus free. If bars are loose but undamaged, undamaged , swaging swagi ng (with a properly radiused radiused tool) of the bars near each end of the core co re stack and at one or more locations along along the stack s tack length may expand expand the bar material material sufficiently suff iciently to tighten tight en the fit. Swaging is not acceptable if the bars are of the T-shape T-shape (narrow top, wide bottom) designed designed for a loose fit of the upper portion. Varnish arnish treatment of a rotor containing a loose cage, even if vacuum-pressure impregnation is used, will not permanently lock loose bars in position and shall not be used to repair a loose cage. Unless the bars can be mechanically mechanically tightened, tightened , they should be replaced. T. The entire entire rotor should should be tested tested in one one of two ways to locate broken broken cage bars bars that are not otherwise o therwise apparent. apparent. If the stator and bearings are in in usable usable condition, a singlesingle phase test may be be performed (Apply (Applying ing typical typically ly 10% rated voltage to only two leads of the stator stat or winding, turn the rotor r otor slowly slowly by hand hand and observe for current cu rrent variations indicati ind icating ng the possible possible presence of cage defects; see 6.1.D.3.). Otherwise, the removed rotor rot or can be similarly similarly tested teste d on a “growler”. “growler” . Neither test, unfortunately, unfort unately, is either infallib infallible le or procedur pro cedurally ally standardized. standar dized. A typical difficulty difficulty is is that th thee halves of a  broken bar may separate only when when the rotor is hot, the gap closing closing again when when the rotor cools off. off. Oven-heating Oven-heating the rotor for a short time prior to a Growler Test Test may  be helpful. helpful. U. Examine Examine steel retention caps or “shrink “shrink rings” rings” (usually (usually attached to the ends of high-

This website stores data such as rotor speed rot or cages c ages to restrain centrifugal centrifugal expansion) expansion) for signs of distortion, looseness, cookies to enable essential site or fretting. End rings themselves in such such rotors rot ors may sometimes sometimes fail fail by being expanded functionality, as well as marketing, outward into a somewhat conical shape by high centrifugal forces—a condition that personalization, and analytics. You must be corrected by replacement rather than remachining. may change your settings at any time or accept the default 8.2 –settings. Mechanical

The mechanical condition appraisal should give particular attention to the following: Privacy Policy Marketing Personalization Analytics Save

A.  Antifriction bearings –

Condition of lubricant; dirt, rust, or moisture; fretting corrosion; thermal discoloration; pitting or spalling of balls, rollers, or races; broken or missing miss ing retainers. ret ainers.

B. Sleeve bearings –

Scoring or wiping of babbitt; integrity of any insulation furnished to  block passage of bearing bearing current (50 MΩ minimum IR is recommended; no temperature correc tion is needed; use megohmmeter correction megohmmeter with less than 50 V output output); ); oil Accept All leakage; oil ring ring wear. Check forced-oil forced -oil lubrication lubrication systems for blockage blockage inside  piping;  pipi ng; presence of proper metering metering orif orifices ices in in the system; system; proper pump operation.

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C. Shafts – Straightnes S traightnesss

(NEMA MG 1-2003 Rev.1-2004, Rev.1-2004, Section Sec tion 1, Part 4 Par. 4.11); cracks, corrosion; co rrosion; scoring or galling galling

D. Seals – E.

Rubbing or wear; leakage; glazing or hardening of felt or elastomeric materials

Gaskets – Hardened, broken, or shifted parts; missing gaskets; evidence of lubricant or contaminant contami nant leakage passed a gasket

F.  Fasteners and dowels dowels – Loose, Lo ose,

missing, missing, or broken parts

G.  Frame or housing –  Corrosion; structural weld

integrity; integrity; blocked drains, breathers, or

ventilating air passages; paralleling of feet H. Condition of accessories accessories –

Space heaters, thermostats, etc.

 I. Bearing replacement 

1. Replace all all antifrict antifriction ion bearings bearings after removal as noted on Appendix Appendix B (except if advised differently by User). 2. Large expensiv expensivee bearings, bearings, such as, spherical spherical roller thrust beari bearings ngs may may be be kept and inspected and reused at User’s User’s discretion. a. Check Check for for sym symptoms ptoms of shaft shaft current current flow flow  b. Improper thrust loading c. Fatigue d. Lubr Lubric icat atio ion n failu failure re e. Inte Intern rnaal Clea Cleara ranc nces es J.  Mounting feet flatness flatn ess (motor

frame feet are to be flat within 0.005 inch when placed on a flat reference reference surface). If motor frame frame feet are out of tolerance, remachine remachine to specification or 0.003″ whichever is smaller.

8.2.1 – Recondition of Stator A.

All components’ compo nents’ parts shall be thoroughly thor oughly cleaned. Steam cleaning is the preferred method. Cleaning will will continue until all vent slots are free of any obstruction which may interfere with proper cooling of the motor. Insertion of any metal object into into

ventilation passages of a stator is unacceptable under any circumstances. This website stores data such as cookies to enable essential site B. Prior to the varnish application, the windings will be preheated to 110 °F to 130°F to functionality, as well as marketing, personalization, and analytics. You air and moisture and ensure thorough impregnation. Oven temperature must remove may change your settings at not any exceed time 290°F during the drying cycle for Class “F” or “H” insulation. Oven or accept the default settings. temperature must not exceed 250°F for Class “A” or “B” insulation.

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C.

D.

Final megger reading must exceed 10 megohms at room roo m temperature. temperature . A reading  below 10 megohms megohms requires com communi munications cations with with the User. User. The stator stato r must be sealed. If the stator is well well sealed, no additional varnish is required. If the stator requires seali sealing, ng, the “Dip and Bake” method is recommended. recommended. If this is not practical, either the spray or flow method can be used. If no varnish varnish is required or the “Dip and Bake” method is not practical. The User must be contacted.

Accept Allassembly E. The assembly of the motors repaired under preventive preventive maintenance maintenance should should follow follow the

normal repair specification for AC motors.

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8.3 – Stripping and Cleaning

One of the most potentially damaging procedures in the rewinding operation is the removal of the old, failed, failed, electrical windings. windings. The controlled contr olled oven burnout burnou t is the recommended practice. practice . 8.3.1 – Oven Burnout

Prior to burnout, burn out, a Core Cor e Loss Test Test is to be performed by the Repair Facility. Facility. Coils are to be removed after burned out burned in the burnout bur nout oven. recordings Monitor and the lable stator stato lam inations ns with aor recording temperature indicator. indicator. Temperature arerecord to be availab avai le rtolaminatio User, inspector, authorized representative. A copy of this time/temperature time/temperature recording is to be submitted wit with h data sheets. Control the oven chamber to 650°F (353°C) or below and stator laminations to a maximum of 725 °F (385°C) to prevent damage to the lamination lamination insul insulation. ation. Control the rate of temperature rise to prevent ignition of combustibles.  Note: The use of hand-held hand-held torches or direct flam flamee is not acceptable. 8.4 – Replacement of Coils and Insulation System A.

After removal of the old coils, but prior to replacement of the coils, a Core Loss Test is performed, if acceptable, and the laminations should be cleaned, inspected, repaired if necessary, and repainted.

B. Slot lin liners ers are recom recomme mended nded for all all motors. C. Coils Coils should be formed formed from continuous lengths lengths of properly sized and insul insulated ated magnet wire (to match nameplate criteria). Splices are not recommended in individual individual coils under normal circumstances. D. Insertion of coils in slots slots should be be done with care to avoid damage damage to the insulation insulation or magnet wire. E. Crossings Crossings of magnet magnet wire within within the slots slots should be held held to a minimum minimum on randomwound coils. coils. RTDs or thermocouples should be placed within the windings if they were part of the original origin al design design or requested to be added by the User. User. Special care should be taken to ensure that the proper pr oper type RTD is used, and that the temperature/resistance values values are inas calibration. Record RTD type on Appendix B. This website stores data such F.

cookies to enable essential site G. Insulation functionality, as well as marketing, personalization, and analytics. You Insulation systems shall be classified as follows: may change your settings at any time or accept the defaultosettings.  NEMA Class A.  An insulation insulation system system (105°C temperature limit including a 40°C ambient

or 65°C rise) that by experience or accepted test can be shown to have suitable suitable thermal endurance when operating at the limiting Class A temperature specified in the temperature rise standard for the machine under consideration.

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 NEMA Class B.  An insulation insulation system system (130°C temperature limit including a 40°C ambient or 90°C rise) that by experience or accepted test can be shown to have suitable suitable thermal

endurance when at the limiting Class B temperature specified in the temperature rise standard for operating the machine under consideration.

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 NEMA Class F. F.  An insulation insulation system (155 °C temperature limit including a 40°C ambient or 115°C rise) that by experience or accepted test can be shown to have suitable suitable thermal

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endurance when operating at the limiting Class F temperature specified in the temperature rise standard for the machine under consideration. o

 NEMA Class H.  An insulation insulation system system (180°C temperature limit including a 40 °C ambient or 140°C rise) that by experience or accepted test can be shown to have suitable suitable thermal endurance when operating at the limiting Class H temperature specified in the temperature rise standard for the machine under consideration.

1. Only class “F” or “H” or better insulati insulating ng materials materials wil willl be us used ed for the following components: a. Slot Slot ins nsu ulati lation on  b. Magnet wire (Heavy armored P. P. Thermalexe Thermalexe 2000 or GP 200) c. Phas Phasee iin nsul sulatio ation n d. Wedges edges/m /mid iddl dlee wedges wedges e. Sleev Sleevin ing g (Acry (Acryli ligl glas ass) s) f. Tie cord g. Varnish 2. Phase insulat insulation ion will will be used on all all coil coil and turns over 5 HP. HP. A separator will will  be provided between each coil coil in slots. 3.

Motors name-plated C Class lass “H” “H” insulat insulation ion will will be rewound Class Class “H” in in all all respects.

4. All components that constitute the insulat insulation ion system system will will be compatible compatible with with each other. H. Construction Constru ction of Coils through thro ugh 6600 Volts 1. The coils are to be wound wo und with in insulated sulated copper wire and formed to the required shape. shape . Coils shall shall be checked for uniformity before taping and again  before assembl assembling ing in in the stator. The uninsulated uninsulated coil coil is to be made as void free as possible, by filling with epoxy or polyester varnishes, brushed on and hot  pressing  pressi ng operation to fully cure the slot position and maintai maintain n dimensi dimensions. ons. coils are are to be wound, connected connected and insu insulated lated in in the unimpr unimpregnat egnated ed state This website stores data such as2. The coils unless the VPI vessel size prohibits post-impregnation of the completely cookies to enable essential site sta tor. All connections connec tions between coils, phase rings, rings, and leads are to be functionality, as well as marketing, wound stator. personalization, and analytics. You silver soldered or brazed and completely sealed with ground wall insulation of may change your settings at any timelayers of tape. or accept the default settings.

3. Lacings Lacings and ties ties are to be thermosetting thermosetting synthet synthetic-resi ic-resin n impregnated impregnated glass-f glass-fiber iber roping and tapes. All coils are to be securely tied to the surge rings and adjacent coils. Conforming material shall be provided between the surge ring and the bottom bot tom coil side side and top coil c oil sides. All blocking must be tied.

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I.

Provide corona suppression suppression treatment on the outside ou tside of the coils for equipment equipment nameplate namep late rated at or above 6600 volts. HIPOT any area that has corona coron a suppression treatment.  1. Provide at least one sacrificial sacrificial coil, oriented in the stator stat or in line with the stator coils, installed in a facsimile slot, which undergoes the complete VPI process (including cure) with the stator.

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2. Stators S tators too lar large ge for VPI as a compl c omplete ete unit shall be constructed with windings windings that have been VPI’d with a 100% solids, synthetic synthetic thermosetting thermose tting resin. The entire stator shall shall be heat heat treated to cure all resins. resins. Use VPI process at the discretion of the User. 3. Clean the ventilation and air passage so that they are free and clear of restrictions before assembly. 4.washers Secure internal bolts, screws screws,by , and nuts by tack or bent tab keepers. Lock and liquid coatings, themselves, are weld not acceptable. 8.4.1 – Inspection and Removal of Field Coils for Synchronous Rotors

A. Prior to disconnecting disconnecting the wiring, wiring, make make an accurate drawing showing the location of all poles, wiring, fan fan blades, and associated associate d hardware. Shaft keyway can be used as a reference indicating relationship of collector rings, brush exciter, leads, and wiring cleats. B. Each pole pole piece piece should should be match match marked marked with with respect to the rotor spider spider to ensure that they are reassembled in in the same same location and in the same orientation. General  practice is to number number the poles in a clockwise clockwise sequence while while facing facing the collector collector ring or exciter end. C. Measure Measure and record the axia axiall location location of the pole pole pieces pieces with with respect to the rotor core and shaft. (Generally, (Generally, this is best accomplis acco mplished hed by identifyi identifying ng Pole #1, placing a center cente r  punch mark at its mid-point, mid-point, and measuri measuring ng the distance from from the center punch mark to the shaft reference. Then using this this dimension dimension and shaft reference, place a center  punch mark on each of the remain remaining ing poles. poles. Locating the poles in in this manner manner will will all allow ow the rotor to be returned to its correct magn magnetic etic center. center. An alternate alternate method is to measure the distance between each pole piece dovetail and its outside rotor roto r slot edge.) edg e.) D. When inspecti inspecting ng collector rings, rings, if the the rings must must be removed in in order to dismantl dismantlee the  poles, all orientations for for the rings should should be recorded on a drawing. Squirrel-cage rotor Squirrel-cage ro tor bars and their connecting end rings should should be inspected for cracks, arcing in slots, and for cage migration. All cracks and evidence of arcing should be recorded and, if possible, pictures should be taken showing the location of damaged  bars. should be made showing showing the defective defective bar location, location, and all connecting This website stores data such as A drawing should  parts between poles and end rings rings should be identi identifi fied ed and recorded on the drawing. cookies to enable essential site E.

functionality, as well as marketing, Replacement of Bearings and Restoration of Fits and Seals personalization, 8.5 and–analytics. You may change your settings at any time A.   Removal of bearings – Roller and ball bearings should be removed by using hydraulic or accept the default settings.

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 presses or screw-drive screw-drive bearing bearing pulling pulling equipment. equipment. Removal Removal by hamm hammerin ering g is not acceptable. When heat must be applied applied for remova removal, l, precautions are to be used to ensure that heating is concentric and that the shaft will not be heated unevenly, does not exceed 250°F, and the bearing should not be reinstalled.

B.  Reassembly of bearings – Split sleeve bearings should be fitted to journals by “bluing and scrapping” as in the following: 1. Bearing and journals must be mic’d and compared to the manufacturer’s journal are to be mic’d mic’d at three locations Accept All tolerances. Both the bearing and journal across the length; the location for these readings is in the center of each and 1/4″ in from from the ends. Also mic mic each at three locations around the surface; at

the 12:00, 2:00 2:0 0 and 4:00 o clock positions. These micrometer readings sshall hall be  NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

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recorded on Appendixes Appendixes F and F-1. 2. Using a bearing-scraping tool (typically a triangular file with the teeth ground off), scrape any side reliefs and lands to the clearances and contours recommended by the motor manufacturer. manufactu rer. Apply a small amount of nondrying  bluing  blu ing compound to the shaft journal, journal, spreading spreading it out to form a uniform uniform coating 1-2 inches wide over the full full length length of the bottom bot tom of the journal. Lift the shaft shaft slightly, roll the lower bearing half into place, then lower the shaft onto it, ensuring that the normal rot rotor or weight is applied to the bearing. Turn the shaft shaft 1/2 to 1 revolution. Lift the shaft again, and roll the lower bearing half out out.. A  pattern of very light light blue blue and dark blue areas wil willl be seen seen on the bearing surface. These correspond to “low” and “high” portions por tions of the bearing surface, surface, respectively respec tively.. Scrape the high spots to make the light/dark pattern patte rn uniform; uniform; the fitting process should be repeated with bluing as required until at least 80% contact cont act has been achieved. When this is complete, leave the lower bearing half half in place place with the rotor ro tor weight resting on it. 3. If the bearing halves are not within limits, according to the manufacturer’s specificat speci fications, ions, both bearing halves halves must be rebabbitted if too loose, or the top half of the bearing must be scraped if too tight. 4. Reassembly of horizontal or vertical tilting-pad tilting-pad or shoe bearings bea rings should follow whateverr procedures whateve procedure s the manufacturer prescribes. Unless supplied by by the User, details of that procedure should be given to the User as part of the final final repair report. 5. Ball or roller bearings should should be fitted fitted to shafts by heat-expanding the inner  bearing  bearin g race in accordance with with the bearing manufacturer’ manufacturer’ss recommendations, recommendations, however, not to exceed 250 F, using an oil-bath heater or an induction heater. Care must be exercised when using using an induction heater to ensure that heat is evenly applied to the bearings. Bearings must not be allowed allowed to seize onto the shaft in a cocked position or before being fully seated up to the location shaft shoulder or retaining ring. ring. For those motors moto rs in which the outer oute r bearing race is the “tight-fitted” member (e.g., vibration screen drives), the bearing chamber is to be heat-expand hea t-expanded: ed: the inner bearing race will be a slip fit on the shaft. Any tight-fitting bearing bearing race shall shall be equally equally applie applied d around This website stores data such as  pressure used to seat a tight-fitting that race. cookies to enable essential site  

functionality, as well as marketing, 6. Sealants should not be used to secure a bearing bearing race against against rotation. If the personalization, and analytics. You metal-to-metal fit between races and the shaft or bearing housing is not within may change your settings at any time design limits, the fits between the shaft and bearing inner race should be either or accept the default settings.

 bushed, sleeved, sleeved, remachined, remachined, or chrome plated and machi machined ned to size. Journals should be machined machined to an RMS 63 or better. bett er. Metal spraying should be avoided since it causes stress risers. Fits between the bearing bearing outer race and the housing  bore should be machin machined ed and welded or bored and sleeved, sleeved, whichever whichever is most most economical for the User.

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7. Grease-lubricated Grease-lubricate d bearing housings or chambers chambers should be packed no more than 1/3 full, using a grease approved by the User. 8. Either sleeve or antifriction bearings may be electrically insulated in some way to block the passage of damaging shaft currents originating within the machine’s electromagnetic electromagn etic dissymmetries. dissymmetries. The integrity of this insulation, insulation, as applied to the

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 bearings  bearin gs themselves, themselves, should should be tested during the reassembly reassembly process. (See  NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

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 paragraph 8.2.B.) 9. All accessories accesso ries fitted fitted to bearing assemblies assemblies shall shall be replaced so that tha t bearing insulation is not short-circuited, and so that no protective system sensitivity is lost. Such accessories accesso ries include include lubrication system piping and ffittings, ittings, as well as temperature or vibration sensing devices.  

10. Bearing assemblies assemblies should be adjusted to provide total tot al shaft endplay in accordance acco rdance withthe theendplay machine’s machine’ design limits. For horizontal horizon talon shaft antifriction antif riction  bearin  bearing g motors, must msust allow allowlimits. for thermal expansion expansi of the shaft without damage to the bearings. bearings. For vertical vertical motors, locknut adjustments, adjustments, spacer rings, and installations of thrust bearing, support springs must be in accordance with the manufacturer’s instructions (or User’s specifications). Sleeve-bearing machines must be assembled—by adjustment of bearing or rotor  positions—such  positions —such that the rotating assembly assembly wil willl “f “float” loat” at its magneti magneticc center  position within within the normal normal endplay endplay lim limits. its. This natural natural rest position wil willl be indicated by magnetic center indicator supplied on the motor, which should be carefully checked at a t reassembly. reassembly. Any change in the magnetic center position, although it may be acceptable, must be marked on the shaft so as not to mislead the installer into positioning the coupling inappropriately.  

11. Observe the bearing assembly for oil leaks with the system properly prope rly filled filled with oil and repair all leaks as needed.

8.6 – Rotor/Stator 8.6.1 – Stator and Rotor Lamination Repair

A. Eliminate Eliminate laminations laminations with mechanical or electrical damage. The following following four methods of repairing repairing laminati laminations ons in a motor stator or rotor ro tor are dependent on the degree of damage. Selection of a method method is based on the inspector’s inspector’s experience experience and  judgment  judgm ent as to which repair method method will will elim eliminate inate core hot spots. 1.  Method One. (Sta (Stator tor is slightly slightly rubbed by the rotor, rot or, fusing the edges of the laminations together.) The effectiveness of this method depends on the depth of the slot and the extent exten t to which the winding winding fills fills the slot. The fused laminations laminations be vibrated apart with an air-driven hammer placed against the end of the This website stores data such as may core section. sec tion. Vibrations of the lamination lamination fingers fingers will break the metal fusion. cookies to enable essential site While vibrating the damaged section, spray a high-quality insulation varnish in functionality, as well as marketing, the damaged area. As the fingers fingers vibrate, vibrate, the varnish will will penetrate penetr ate the air gaps personalization, and analytics. You caused by the vibration vibration and reinsulate the fingers. fingers. This method method assumes the may change your settings at any time damage is near near the end of the stator core section and the damage is on the tips or accept the default settings. Privacy Policy Marketing

of the fingers. Alternately, the laminations laminations can be separated and an d the interlaminar interlaminar insulation can be restored by the insertion of varnished mica splittings followed  by an overall overall varnis varnish h treatment.

2.  Method Two. failed in in the slot, thereby melting the laminations, laminations, or the th e Two.  (Coil has failed stator stat or is moderately rubbed by the rotor.) rot or.) With With a pencil metal grinder, grind Personalization away fused metal until a definition of core laminations laminations can be seen. Small, h highighAnalytics speed (25,000 r/min) r/min) hand grind g rinders ers equipped with carbide-tipped, carbide-tipped, cone-shaped rot rotary ary files files work best. Grind with with light, light, intermittent pressure (rather than Save Accept All continuously) with movement in the same plane as the laminations until the fused metal is removed. removed. Repaint the ground area and test the core for hot spot in the damaged area. Do not grind an area that will damage the mechanical integrity of

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the slot. If the damaged damaged area is more than 20% of the total surface surface area of the core, then go to Method Three. 3.  Method Three.  (Damage is is greater than 20% of total core-surface area or hot spot cannot be eliminated eliminated by Method Two.) If the damaged area cannot be repaired by one of the first first two Methods, then a partial or total t otal restacking of the stator or o r rotor rot or core must be considered. The laminati laminations ons will will need to be disassembled and replaced or repaired by hammering and sanding away the damaged metal. The laminations laminations must then be reinsulated by dipping in an organic insulating material with at least 300 °C temperature rating and air-drying  before reassembl reassembly y. Inorganic Inorganic insulation insulation with with higher temperature temperature ratings is is  preferred, if availabl available. e. The damaged area can be redistributed redistributed in in the core by rot rotation ation of each damaged lamination lamination by one slot. This may may require rekeying rekeying the lamination lami nation in the frame.  

4.  Method Four. Four. Coning (flaring) of end laminations on rotors should be fixed by welding to rigid laminations, installation of rigid fingerplates, undercutting and  banding,  bandi ng, or lamination lamination replacement. replacement. Excessive Excessive coning of the end lam laminatio inations ns will will often require replacement of the rot rotor or to achieve a satisfactory result. Vacuum pressure impregnation impregnation (VPI) or varnish varnish treatment shall shall not be used. B. Rotor/shaft Rot or/shaft assemblies lifted androtor handled as not to transmit any li lifti fting ng or other othe r stresses should to any be partlifted of the roto r cagecarefully or other so motor windings. windings . Lifting Lifting equipment equipm ent must not cause abrasion or other physical physical damage damage to journal surfaces surfaces or seal fits. fits. Do not allow allow the rotor rot or to drag against the inner inner diameter diameter of the stator when inserting ins erting the rotor into the stator.  C. Centering of the rotor within the stator should be checked, checked, whenever permitted permitted by the machine construction, by both “stationary gap” and “rotating gap” feeler gage readings at both ends of the motor. Readings Readings should be taken at not less than six six points 60° apart around the rotor r otor periphery. periphery. In the “stationary” check, check, feeler feeler gages are inserted successively successi vely at the separate points and the values are recorded. In the “rotating” check, the gages are left at one location and the rotor rot or is turned in 60° steps, noting the reading at each step. This test can reveal reveal an eccentri eccentricc rotor that may go undetected by the “stationary” test. Record Recor d final final air gap reading on Appendix B. Readings shall shall not exceed a 10% deviation deviation from the average at each end according to the following following This website stores data such as cookies to enable essential site formula. functionality, as well as marketing, personalization, and analytics. You may change your settings at any Where: time or accept the default settings.

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D = [(H-L)/A]100 D = percentage p ercentage deviation H = highest of the readings at one end of the motor  mot or  L = lowest of the readings at the same end of the motor  A = average of the readings at the same end of the motor 

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9.0 – Balancing

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9.1.1 – Balancing – Shaft and Fitment Key Convention

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9.1.1.1 – Standard Key Accept All

A. For rotating machines machines and machi machine ne components with with a keyed keyed shaft, this this Standard requires requires  balancing  bala ncing be achie achieved ved using a standard standard one-half key in the key seat in accordance with with

ISO 8821-1989(E). ISO 8821-1989(E) applies applies to rotors rot ors balanced balanced in balanc balancing ing machine machines, s,  NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

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in their own housings, or in situ, and applies to keys of constant rectangular or square cross-section, keys mounted on tapered tape red shaft surfaces, woodruff, gi gib, b, dowel and other o ther special keys. B. If a full full key, key, corresponding to the half key key used for balanci balancing, ng, is not provided with with the rotating machine, a tag, as shown in Figure 1, will be attached to the machine indicating the dimensions of the key used to perform the balance test. C. shaft, If no key is is shipped shipped with withalf-key h the shaft, anoriginally d a tag as for shown in in Figure Figure is not attachedtotobe thethe the length of the usedand balancing the 1, shaft is assumed same as the length of the shaft keyway (Ref. ISO 9921). A

B

 b

 

a

A = “HALF K EY” EY” LENGTH USED FOR 

 

BALANCING ROTOR 

A = ______________________________  ______________________________  FINAL ASSEMBLY KEY LENGTH

a = DEPTH OF K EYWAY EYWAY IN SHAFT   a = ____________ ___________________________ ________________  _  B = “ HALF K EY” EY” LENGTH USED FOR    BALANCING THE FITMENT B = ___________________________ 

This website data as IN FITMENT  b = Dstores EPTH O F K such EYWAY EYWAY cookies  to enable essential site b = _____________________________ ______________ _________________  __  functionality, as well as marketing, personalization, and analytics. You may change your settings at any time or accept the default settings.

FINAL ASSEMBLY K E EY Y LENGTH = (A X a) + (B X b) FINAL ASSEMBLY K E EY Y LENGTH = _____________ ____________________  _______ 

OTOR   A  R OTOR  ASSEMBL Y S/N or other ID# _____________________________________________ 

ITMENT S/N or other ID# ______________________________________________________  Privacy  F Policy

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9.1.2 – Shop Balancing Balancing   Save Accept All A. Speed

 

Fig. 1 – Balance Test Key Dimensions

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For the purposes of balancing, balancing, the greater of the maximum maximum speed indicated indicated on the motor name plate or the actual maximum in service speed shall be referred to as the “in service” speed.



Balancing shall occur at the highest practical rotating speed which does not exceed the in service speed nor place the rotating element within 25% of its critical speed.

  B. Weights •

The use of solder or simil similar ar deposits to achieve rotor rot or balance is not acceptable. acce ptable. Any  parent metal removed removed to achieve balance balance shall shall be be dril drilled led out in a manner manner which which will will maintain the structural integrity of the rotor.



The attachments of weights to the rotor rot or shall be done using non-corrosive material material and good practices to insure the integrity of the rotor and the attachment.



It is recommended that old weights be removed rather than applying new weights to oppose them.

  C. Balance Balance Methodology • Rotors Rot ors shall be supported suppor ted in the balancing balancing machine on the bearing fits, if if practical. If not  practical, it is is acceptable to support the rotor r otor close to the bearing fits, fits, provided that  portion of the shaft is concentric within within 0.0005″ TIR of the bearing bearing fit. •



During balancing, all unused key seats will be filled with a standard half key or its equivalent as described in this document. All rotors and rotors with integral attachments will initially be balanced in at least two  planes without without external attachments instal installed led to the shaft.



If the rotor ro tor is to be fitted with external attachments attachments or fixtures fixtures (coupling hubs, hubs, brake wheels, etc.) when delivered to the customer, it is recommended that these external attachments be fitted to the already balanced rotor using a standard key as described in This website stores data such as this document. The rotor roto r assembly assembly is then rebalanced with the primary correction corr ection cookies to enable essential site  plane(s)) corresponding to the attachme  plane(s at tachments nts or fixtures. If disassem disassembly bly is necessary necessary,, these functionality, as well as marketing, fixtures and keys must be marked so that they can be reassembled with the same mating personalization, and analytics.  parts You in the same same positions. positions. may change your settings at any time   or accept the default settings. D. Bala Balanc ncee Standa Standard rd Privacy Policy



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All rotors, rotors with integral attachments, and rotor assemblies including external fixtures and attachments must comply with the API balancing standard and methodology at the in service speed. This standard states st ates the maximum permissib permissible le residual iimbala mbalance nce  per balance plane plane using using the following following formul formula. a. Uper = (4 x W)/N Where Uper = Maximum permissible permissible residual imbalance imbalance in in that plane (ounce-inches) (oun ce-inches) Accept  W = All Weight supported by the balance machine at that journal (pounds)  N = In service service speed (RPM)

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Different balancing machines Different machines use different different units and method methodologies. ologies. Often, it is a matter of metric to English conversions, display in mils rather than ounce-inches or even conversions from balance standard RPM to actual a ctual balancing machine RPM. It is EXTREMELY important that each vendor recognize these differences and compensate for them so that their results are truly representative representative of the balance balance quality and and that they do comply with with the balance standard. standa rd. The result of this balance standard calculation is similar to an ISO 1940/41 G 0.67 specification.

E. Balance Balance Report •

A copy of the report from the final final run of the rotor rot or or rotor with integra integrall attachments as well as a copy of the report from the final run of the rotor assembly will be supplied to the User. At a mimim mimimum, um, the reports repor ts should identify the rot rotor, or, motor, moto r, and job, indicate indicate the date and time of the run, rotor r otor weight on each journal, in in service service speed of the rotor, ro tor,  balancing  bala ncing speed, speed, the make and model of balanci balancing ng equipment equipment used, the calculated acceptance limit based on the above balance standard, and the final balance readings. See Appendix G.

10.0 – Electr Electrica icall Connect Connection ion

A. Where any cables pass across or against metal edges of motor structural parts in the assembled machine, cable should be appropriately sleeved or taped for mechanical protection of the insulation against abrasion. B. All leads should be given permanent markings adjacent to the tterminal erminal lugs lugs in the form of indented metal bands (unless permanently die-stamped into the cable insulation or approved equivalent). Lead identification should be in in accordance accordanc e with NEMA MG 1-2003 REV.1REV.12004. Section 1, Part 2. C. Lead cables cables should should not be brazed or welded to terminal terminal lugs. The preferred method method of attachment is by crimping or pressure indenting the lug barrel, using a lug sized to suit the  particular cable cable stranding stranding provided, provided, in accordance with recommendatio recommendations ns of the lug manufacturer. No split barrel lugs are to be used. The crimping crimping tool too l used should have ratchet pressure control such that the tool cannot be opened and released from the lug unti untill the minimum minimum recommended crimping crimping force has been applied. Whenever possible, one cable should This website stores data suchbe ascrimped within the barrel of any one lug. In no case shall any strands of cable be cut or site ben t back out of the lug barrel so as to more easily fit the cable into the barrel. All bent cookies to enable essential strands must be fully attached to the lug. functionality, as well as marketing, personalization, and analytics. You  D. Any bolted joints in the lead connections, connec tions, such as where two or more mor e lugs are permanently may change your settings at any time  joined ned together or o r where bus bars are interconnected interconnected in some some large machi machines, nes, should should be or accept the default  joi settings.

tightened to the following following minim minimum um torque values values (based on heat-treated, Grade 5.0 steel  bolts having having non-lubri non-lubricated cated threads): Privacy  Policy Marketing Personalization Analytics Save

11. 1.0 0 – Fits

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Bolt Bo lt size (in) 1/4 5/16 3/8

Minimum dry dry tigh tighte teni ning ng torq torque ue (lb.-f b.-ft) t) 11 21 38

1/2 5/8

85 175

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  A. All parts containing cont aining machined fits—bearing brackets, bracke ts, frame structures, struc tures, bearing capsules or holders, etc.—should be handled in such a way as to avoid distorting or scarring any of the machined surfaces. Any such fits should be thoroughly thoro ughly cleaned cleaned before being reassembled to a mating mating part. Take care to avoid getting a fit fit “cocked”, and be sure parts are full fully y seated against any locating shoulders. B. All shaft attachments such as brake wheels and coupling hubs shal shalll be concentric with the shaft centerline of rotation. rotati on. Coupling hubs shall be concentric within the greater greate r of 0.001″ 0.001 ″ TIR or 0.0002″ 0. 0002″ TIR per pe r inch of shaft diameter. diameter. Brake wheels shall be concentric concent ric within within 0.005″ on the diameter. diameter.   C. Gaskets should be replaced with materials appropriate appro priate to the motor’s moto r’s in-service environment. Sealing compounds used in lieu of gasketing should be applied applied in adequate adequa te thickness to fully seal the opening and should be of a consistency such as to remain in place after assembly.   D. Any dowel pins pins supplied between mating parts are to be properly prop erly replaced. Tightness of mounting bolts, or any sort of sealing compound, is not to be relied upon to maintain part alignment.   E. Some large large motors may require shi shims ms to adjust stator position position for correct air gap or to control cont rol bearing pedestal position. Shims used for that purpose must be flat, flat, clean, free from  burrs, and either stepped or tapered as necessary to accommodate surfaces surfaces that may not be  parallel.  parall el. 12.0 – Assembly Assembly

All assembly will be according to good machine shop practices. If the shaft requires replacement, a new shaft will be made of A.I.S.I. 4140 Steel HRHT (Hot Rolled Heat Treated). Under special cases, shaft material will be replaced with 316 stainless or User approved material. material. Motors will be assembled in a manner that will ensure proper fit and alignment. Check and record air gap on o n Appendix Appendix B (Section 8.6.1.C). Al Alll data bolts,such nuts, will be replaced as required with with SAE grade 5 or better and torqued to This website stores as etc., will industry stry standards. metric fasteners use use a grade 8.8 (old grade = 8G) or better. be tter. cookies to indu enable essential site On metric functionality, as well as marketing, personalization, All and assembled analytics. You components will be checked to ensure secure fits. may change your settings at any time or accept the default settings. All covers on openings in the frames or housings must be fastened in a closed position. Privacy Policy

Motor terminals must be identified outside the motor frames.

 New brushes wil willl be instal installed led on all motors. A. Replacement Replacement brushes brushes will will be made made in kind. will supply all brushes. Personalization B. Vendor will C. Brushes will will be be properly seated to ensure proper commutation. Brush holders holders wil willl be be Analytics reconditioned or replaced as required. D. Brush pressure pressure springs springs will will be checked and recorded in in Lb./sq. iin. n. to ensure equal Save Accept All loading on all brushes. Marketing

Replacement cooling fans on rotors shall be of the same type or better than the original fan.

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All broken, burned or cracked motor feet shall be weld repaired and machined to within .003″ (Section 8.2.J) of parallel and flatness. All motors will be returned with an adequately sized conduit box and cover with a gasket between the box and cover. A repair ID Tag will be added showing shop name, identification number and date of repair. After painting, all nameplates, tags and an d shaft will be fully fully cleaned. A non-silicon rust inhibitor inhibitor or or light oil will be applied to the shaft before shipping.   13.0 – Run Test Stand Standard ardss Run test shall be a minimum of 45 minutes duration at the rated voltage and until the temperature of the bearings have stabilized (+/- 1 °C over 15 minutes). minutes). A maximum maximum temperature of 150 °F on  babbitt  babb itt bearings bearings shall shall not be exceeded (unless (unless bearing bearing manufacturer manufacturer specifies specifies otherwise). otherwise). On antifriction bearings and on motors with a cooling fan, the bearing housing temperature should not exceed 30°F above ambient temperature for oil lubrication, and 50°F above ambient for grease lubrication. lubrication. On motors without external cooling cooling fans, the bearing housing housing temperature should not exceed 50°F above ambient. amb ient. At no time should should the temperature exceed the drop test temperature of the lubrica lubricant. nt. On squirrel-cage squirrel-cage motors, check the current on all connect connections ions and check speed of the motor motor.. The current on each phase should be within within 10% deviation deviation between any two other phases. On wound rotor rot or motors, moto rs, apply full full primar primary y voltage to stator sta tor and with rotor ro tor circuit open for a nonn onrotational test. Measure rotor open circuit circuit voltage voltage and stator current. A non-load test run will be made on all motors to ensure that all electrical readings do not exceed the Name Plate Data ratings. A written record of all tests and inspection results will be furnished to the User upon completion of repairs.   13.1 – Vibration Testing on Motors This website data such Acceptance as   stores cookies to enable essential site 13.2 – Quotation functionality, as well as marketing, personalization, A. andThe analytics. You for repair or supply quotation supply of a motor motor shall specify specify that the motor will meet or exceed may change your settings at any time the vibration limits described in this document. or accept the default settings. B. The quotation will reiterate the vibration acceptance levels for the particular motor as defined

in this document and requested by the User. Privacy Policy

Any additional costs required to meet these vibration acceptance limits will be grouped separately on the quotation, itemized in sufficient detail as to permit evaluation by the User. This grouping will be titled “Vibration Limits”. Personalization C. Marketing

  13.3 – “As Found” Tests Analytics Save

A.

“As Found” tests will be conducted during the full voltage, full speed, and no load run test of Accept All a motor sent for repair re pair prior to disassembly. disassembly. If a full full voltage te test st is not performed, these thes e “As Found” vibration tests will be performed at reduced voltage while at full speed.

B. The “As Found” tests will will consist consist of the same same suite suite of measurement measurementss as the “Acceptance “Acceptance  NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

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Tests”, but will not be gauged against the acceptance criteria. C. Motor isolation in in the form of a mounting mounting plate and resil resilient ient support pads is not required during the “As Found” tests. D. Al Alll unused keyways keyways shall shall be fitted fitted with a standard or equivalent equivalent half half key as described described in the Standard Key section of this document. 13.4 – Acceptance Tests Tests A.

“Acceptance ” tests will be conducted “Acceptance” conduc ted after the machine is assembled. They will will be performed at full voltage, at full speed, under no load, and after the machine has achieved thermal stability.. In the case of high stability high voltage motors, “Acceptance” “Acceptan ce” tests may be performed at reduced voltage, at near full full speed (within (within 6% of synchronous synchronous speed), under no load, and after the machined has achieved thermal stability with the written approval of the User.

B. If the machin machinee is to be delivered delivered with a coupling coupling or other fittin fittings gs install installed ed to the rotating r otating component, componen t, these tests shall be done with those items installed. If these fittings fittings are keyed to the shaft, a standard key shall be used. C. Al Alll unused keyways keyways shall shall be fitted fitted with a standard, or equivalent, equivalent, half key as described described in the Standard Key section of this document. 13.5 – Responsibility A.

The Repair Facility shall be responsible for all aspects of test preparation, testing, presentation of results, and long-term storage of the results unless otherwise specified by the User.

B.

The testing shall be done in manner consistent with good vibration data collection practices using calibrated instrumentation that is in good condition to insure accurate, reliable results and shall be performed by ISO 18436-2 18436 -2 category categ ory 2 or higher higher certified persons. Testing by non-certified persons may be acceptable if they are working under the direct supervision of an ISO 18436-2 category 3 certified certified person.

C. The testing shall shall be done at the Repair Facil Facility ity.. If this this iiss impractica impractical, l, the User may may approve otherr arrangements. In no case, will the site of testing relieve the Repair Facility of othe responsibility for passing the vibration Acceptance Tests. This website stores D. data The such Useras shall shall have the option of being present during during vibration vibration testing and verify verifying ing testin testing g  performed Facility y prior to final final acceptance by the User. cookies to enable essential site by the Repair Facilit functionality, as well as marketing, E. The User will will maintai maintain n measurement measurement results of all all vibration vibration tests in el electronic ectronic (preferred) or personalization, and analytics. You hardcopy hardco py form for a minimu minimum m of 10 years. years. Make, Model, Mod el, Serial number, number, User number, number, may change your settings at any time order number, and date shall be used to index these sets of vibration results. or accept the defaultrepair/purchase settings.

F. Measurement Measurement results results according to paragraphs G and H below below,, will will be conveyed conveyed to the customer custom er in a format acceptable to the User. The format may be hardcopy, electronic transfer, Privacy Policy MIMOSA Data Exchange format, or o r other electronic format format acceptable to the User. Marketing

G. “As Found” vibration test results will will include:

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2. A tabular representation of maximum line amplitude measures in inches/second peak fortabular each frequency band of and location, andband limited overall amplitude in G’s peak 3. A representation the maximum Accept All for each frequency band and location.

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H. Post-repair Post -repair Acceptance Acceptan ce tests results will include: 1. Frequency domain domain (spectrum) plots plots across the frequency ranges ranges of interest, interest, 2. A tabular representa rep resentation tion of maximum maximum line line amplitude amplitude measures in inches/second  peak for each frequency band and location, 3. A tabular representa repr esentation tion of the maximum band limited limited overall amplitude amplitude in G’s G’s peak for each frequency band and location, 4. A tabular representation representa tion of the maximum maximum allowable vibration limit limitss for both 3 and 4. J. A signed signed statement of adherence adherence to the testing testing methods methods and compliance compliance with with the vibration vibration acceptance levels levels must accompany the post-repair results to the User before motor acceptance will be authorized. 13.6 – Instrumentation Requirements

A. Instrument Capability and Settings 1. The instrument will will be be capable of driving acceleration transduce tr ansducers rs directly, of integrating acceleration to velocity in either the analog or digital realms, of digitizing the analog vibration signal, and performing FFT  processing to the frequency domain ((rather rather than utilizi utilizing ng a swept or tunable filter to derive frequency components). 2. The instrument will have at least 72 dB of effective dynamic range. 3. The instrument will utilize appropriate anti-aliasing filters for all measurements. 4. The instrument will be capable of at least 400 usable FFT lines of resolution, however how ever no more than 800 FFT lines lines will will be used for for any measurement. Additional measurements measurements across lower frequency ranges m may ay  be necessary necessary to adequately adequa tely resolve signal signalss down to 0.3x running running speed. 5. The instrument will be able to apply ap ply a Hanning window window during FFT  processing. This Hanni Hanning ng window will will be used with all all FFT measurem measurements. ents. This website stores data such as cookies to enable essential site functionality, as well as marketing, personalization, and analytics. You may change your settings at any time or accept the default settings.

6. The instrument will be capable of linear averaging in the frequency domain. A minimum minimum of four (4) linear averages with no more mor e than 50% overlap processing proce ssing is required. No more than 16 averages will will be used for any measurement. 7. If overlap processing is available in the instrument, no more than 50% overlap will be used. 8. If used, high pass filtering filtering (low frequency cutoff) settings will will not filter filter out frequencies frequencies of   interest.

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13.7 – Transducer and Mounting

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Transducers will will be of the “Industrial “Industrial”” style and and measure acceleration. acceleration. AnalyticsA. Transducers Save

B. The transducer nomina nominall sensiti sensitivity vity will will be 50mV/g, 100 mV/g, mV/g, or 500mV/g. Accept All

C. The transducer calibration calibration value value will will be within within +/- 10% of nominal nominal at 100 Hz.

D. The transducer output will be linear linear,, within within +/ 5%, from 0.3x running running speed through 2000Hz.  NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

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E. The transducer wil willl b bee mounted to the ma machin chinee under test using using a 2-shoe magnet, magnet, flat magnet, or stud mounting. During acceptance testing, the mounting locations shall shall  be smooth, clean, and free free of debris debris or paint. During “as “as found” testing, testing, the mounting locations shall be clean and finished such that the mounting is firm,, not rocking. The use of a handheld probe mounting is not acceptable. firm acce ptable. F. The mounted natural natural fr frequency equency of the transducer and magnet magnet must exceed exceed 2000 Hz by at least 30%. In the case of triaxial triaxial transducers, the mounted natural frequency frequency of the transducer and magnet in all three planes must exceed 2000 Hz by at least 30%. G. The transducer electronics electronics must must be isolated isolated from case and ground. H. The measurement measurement system system used to take vibration measurem measurements ents (instrument, (instrument, cable, cable, transducer, and mounting) shall have a +/- 5% amplitude accuracy between 0.3x running speed and 2000 Hz.

  13.8 – Test Locations

A. Horizo Horizonta ntall Shaf Shaftt Motors Motors   1. A min minimum imum of six separate separa te locations on each motor will be tested. These locations shall be as close as practical to each bearing. 2. Each bearing will will have a radial measurement made in in the horizontal direction, facing the centerline of the shaft. These will be described using the conventio c onventions ns MTR OB HOR & MTR IB HOR or  MTR ODE HOR & MTR DE HOR  3. Each bearing will will have a radial measurement made in in the vertical direction, facing the centerline of the shaft. These will be described using the conventio c onventions ns MTR OB VER & MTR IB VER or  MTR ODE VER & MTR DE VER  This website stores data such as cookies to enable essential site functionality, as well as marketing, personalization, and analytics. You may change your settings at any time or accept the default settings.

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4. Each bearing will will have an axial (parallel to the shaft) measurement made. This axial measurement should be as close to the shaft as practical and located at the 12:00 position. These will be described using the conventions MTR OB AXL & MTR IB AXL or  MTR ODE AXL & MTR DE AXL TEFC or other shrouded machines may make it difficult to get close to the shaft. In those cases, a foot type measurement measurement is acceptable acceptable and should be noted with the results. 5. Measurements Measurements cannot be made made on sheet metal metal covers, fan fan shrouds, or other parts whose position, natural frequency, or damping will significantly affect the measured vibration.

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B. Vertical and Non-Horizontal Shaft Motors Accept All

1. A min minimum imum of six separate separa te locations on each motor will be tested. These locations shall be as close as practical to each bearing.

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2. Each bearing will have a radial measurement made inline inline with the direction of the “Point of Energy Input” (typically the junction box), facing the centerline of the shaft. shaft. These will will be described using the conventions MTR OB INL & MTR IB INL or  MTR ODE INL & MTR DE INL 3. Each bearing will will have a radial measurement made perpendicular to the direction of the “Point of Energy Input” (typically the junction box), facing the centerline of the shaft. shaft. These will will be described using the conventions MTR OB PER & MTR IB PER or  MTR ODE PER & MTR DE PER  4. Each bearing will have an axial (parallel to the shaft) measurement made. This axial measurement should be as close to the shaft as practical and located either in the center of the end bell or offset to the “Point of Energy Input” (typically ( typically the junction box). These will be described using the conventions MTR OB AXL & MTR IB AXL or  MTR ODE AXL & MTR DE AXL TEFC motors, shrouded machines, or mounting in the test stand may make it diff difficult icult to get close to the shaft. In those cases, a peripheral axial measurement is acceptable and should be noted with the results. 5. Measurements must be made on a rigid portion porti on of the machine. machine. They cannot be made on sheet metal covers, fan shrouds, or other o ther parts whose  position, natural frequency frequency,, or damping will will signif significant icantly ly affect affect the measured vibration. 13.9 – Technical Technical Details  

A.

Acceptable Units

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1. Frequency

Hertz or CPM

2. Ro Rotational Speed

RPS (revolutions per second)

or 

RPM (revolutions per minute)

3. Vibration Displacement 0.001”)

Mil Peak to Peak (1 Mil =

4. Vi Vibration Velocity

IPS Peak (Inches per second)

5. Vibrat bratiion Accel celerat eratio ion n

G Pe Peak ak (G is acce accellerat ration ion of gra gravity) ty)

  13.9.1 – RMS vs. Peak Types

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A. The FFT process, by definit definition, ion, produces only RMS (root mean square) amplitude amplitude values. values. These tests do not require the display display of RMS values.

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B. The Peak amplitude amplitude values are derived from the RMS FFT values values based on the si simpl mplee equation Peak (P) = 1.414 amplitude tude type is required required for these tests. Accept All x RMS value. This Peak ampli

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C. The Peak-to-Peak amplitude amplitude values are derived from from the RMS FFT FFT values values based on the simp simple le equation Peak (P) = 2 x 1.414 x RMS value. value. This Peak-to-Peak amplitude amplitude type is not required required for these tests. D. The true Peak amplitude amplitude value must be derived from the time time domain. domain. It is the the magnitude magnitude of the most extreme excursion from “zero” within a time block. This amplitude amplitude type is not required re quired for these tests. E. The true Peak-to-Peak amplitude amplitude value must be be derived derived from from the time domain. domain. It is the difference between the most negative observed value and the most positive observed value within a time block. This amplitude amplitude type is not required for these tests. tes ts.  13.10 – Frequency Bands A. The frequency frequency range of a measurement measurement will will be divided divided into into subgroups called called Bands. The Fmin Fmin and Fmax will be defined in terms of order of running speed or in absolute frequency units. B. If a line line of resolution resolution fall fallss upon the Fmin Fmin of one band and the Fmax Fmax of another band, it is included in both bands. C. The Bands Bands may may or may may not overla overlap. p. D. Acceptance criteria criteria wi will ll be associated associated to the vibration peaks (Line (Line Amplitude) Amplitude) or power (BandLimited Lim ited Overall O verall Amplitude) within each band.   13.11 – Line Amplitude Acceptance Limits A. Line Amplitude Amplitude Acceptance Limits Limits are applicable applicable to bands of any width. width. B. The “Line “Line Ampl Amplitude” itude” is the magnitude magnitude of the single single FFT line line or cell at that frequency or line of resolution.. Effectively, resolution Effectively, it is the RMS power powe r contained in one frequency bin. bin. C. The magnitude of all line liness within within a band must not no t exceed the Line Amplitude Amplitude Acceptance Limit Limit for that band.  

13.12 – Band-Limited Overall Amplitude Acceptance Limits

A. Band-Limited Band-Limited Overall Overall Amplitude Amplitude Acceptance Limits Limits are only applicab applicable le to bands that are at least This website stores data five (5)such linesasof resolution in width. cookies to enable essential site B. The “Band-Limited Overall Amplitude” Amplitude” is the overall vibration vibration contained con tained functionality, as well as marketing, within that band. It can be calculated using using the following following formula. formula. Please personalization, and analytics. You note that many software manufacturers that offer frequency banding and may change your settings at any time “powerr within band” as an option “powe optio n utilize utilize equivalent calculations. This should should or accept the default settings.

 be verifi verified ed with your software manuf manufacturer acturer before use.  N 

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∑ A  BLOA =

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2 i

i =1

 LS 

Where BLOA =Band Limited Overall Amplitude AI = Amplitude of the ith line of resolution (I=1) = The first line line of resolutio resolution n in the the band (I=N) = The last line of resolution in the band  N = The number number of lines lines of resolutio resolution n in the the band LS = Line Line Shape Shape Factor Factor (1.5 (1.5 for for Hann Hannin ing g Win Windo dow) w)

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C. The calculated Band-Limited Overall Amplitude of a band must not exceed the Band-Limited Overall Amplitude Acceptance Limits for that band. 13.13 – Motor Mounting for Testing

A. Base Base Pl Plat ates es 1. Motors that do d o not use resilient resilient mounting mounting in in service service will will utilize utilize a steel or aluminu aluminum m base  plate of substantial substantial stif stiffnes fnesss during testing. testing. 2. The base base plate plate must must not exceed exceed 5% 5% the mass mass of the motor. motor. 3. The motor must must not rock on the the plate; plate; soft soft foot must must be eli elim minated. inated. 4. The linear linear dimens dimension ion of the base plate plate will will at least equal, equal, but not exceed, the projected projected motor base by more than 10% or o r four (4) inches, inches, whichever whichever is the greater. 5. While While testing, testing, the motor shall shall be positioned on the base plate to provide unifor uniform m compression compressi on of the support pads.   13.13.1 – Cradles for Flange Mounted Non-Vertical Motors A. Flange Flange mounted motors shall shall be mounted to a cradle to simu simulate late their “in “in service” service” orientation. B. The base of the cradle will will be flat and sized sized as a base plate for a like like frame size foot mounted motor. C. The mass mass of the cradle and its base must must be no more than 10% of the mass of the motor under test.  

13.13.2 – Cradles and Adapter Plates for Vertical Vertical Motors

A. Vertical shaft motors wil willl require require the use of a cradle cradle or adapter plate to support the motor moto r in a vertical vertical orientation. orientation. These fixtures fixtures must support the motor in the “in service” orientation to mimic their in service mounting. B. If used, used, the adapter plate shall shall be ffixed ixed to the mounting flange flange of the motor under test. The motor must be be centered in in the adapter plate. plate. This website stores data such as cookies to enable essential site functionality, as well as marketing, personalization, and analytics. You may change your settings at any time or accept the default settings.

C. If a cradle is is used, the motor motor must rest securely securely,, without rocking in the cradle. Fastening Fastening the motor to the cradle is acceptable acceptable and suggested. D. The cradle or adapter plate shall shall not exceed the di dimens mensions ions of the motor flange by more than six (6) inches. E. The mass mass of of the cradle cradle or adapter plate plate must must be no more more than 5% of the mass of the motor.

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F. Extra care must be taken to secure vertical vertical machines machines in a safe manner manner during testing.

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13.13.3 – Support Pads

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A. Res Resil ilie ient nt support pads can can be used used to support the motor, motor, the motor sitting sitti ng on a base plate, the motor at attached tached to the cradle with base plate, plate, the motor sitting on the vertical cradle, cradle, or the motor attached a ttached to the vertical adapter plate.

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B. If used, used, resili resilient ent support pads shall shall support the entire base base plate area. The pad shall not be more than 10% larger than the base plate.

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C. Resilie Resilient nt support pads must must be selected such that when when the motor and auxiliary mounting fixtures (if any) are placed upon the support pads, they do not no t rock and the up and down natural frequency is less less than 25% of the test speed of the motor. D. Resilie Resilient nt support pad thickness thickness sha shall ll be such such that the downward deflection of the pad due to the static load of the motor and support plate, if used, shall not be more than 50% of the original pad thickness. The deflection must be at least that calculated with the formula: Deflection (inches) = (900/RPM)2 or the values in the table below.  

Motor Sync Speed

Minimum Deflection

72 7 20 900 1200 1800 3600

1.56″ 1.00″ 0.56″ 0.25″ 0.06″

E. For any motor motor to be tested, the necessa necessary ry thickn thickness ess of the the resili resilient ent pad can be calculated from the following formula: T = KDA/F Where T = Pad Thickness (inches) K = Modulus of elasticity (lbs. per square inch) D = Deflection required (inches) A = Area of contact between pad and base/feet base/feet F = Weight of motor and fixture   13.13.4 – Foot Mounted Horizontal Shaft Motors A. Select an appropriate base base plate plate for for the motor. Select and place the appropriate support pads on a flat horizontal horizontal test surfac surface. e. Place the base base  plate on the support pads. Place and center the motor on the base plate. This website stores data such as The motor musttoremain horizontal. horizont al. Reposition the pads,  base plate, shaft or motor obtainrelatively a stabl stablee test environment. environm ent. cookies to enable essential site functionality, as well B. as marketing, If th thee moto motorr is is to be be res resilient ientlly moun mounte ted d whi while le in se serv rvic ice, e, omit omit the the bas basee pla plate te.. Se Sele lect ct personalization, and analytics. You and place the the appropriate support pads on a flat horizontal horizontal test surface. Place the may change your settings at any time motor on the support pads. The motor shaft must remain remain relativ relatively ely horizontal. or accept the default settings.

Reposition the pads and motor to obtain a stable test environ environment. ment.

13.13.5 – Flange Mounted Non-Vertical Shaft Motors

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A. Attach the flange flange of the motor motor to an appropriate cradle with integral  base plate. Select and place place the appropriate support pads on a flat horizontal test surface. surface. Place the motor and cradle with integral integral base base plate on the support suppo rt pads. The motor shaft must remain positioned in its in service servi ce orientation. Reposition the the pads, base plate, or motor to obtain a stable test environment.

13.13.6 – Flange Mounted Vertical Shaft Motors (Cradle)

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A. Sel Select ect the appropriate appropriate cradle cradle and attach it to the motor flang flangee if needed. Select and place place the appropriate support pads on a flat hor horizontal izontal test surface, table, table, or structure. Place the cradle on the the support pads. Place the motor flange flange onto the cradle, if if not alr already eady attached. The motor shaft must be relatively vertical and in the in service orientation. Reposition the pads, cradle, or motor to obtain ob tain a stable stable test environment. environment. 13.13.7 – Flange Mounted Vertical Shaft Motors (Adapter Plate)

A. Attac Attach h the fla flange nge of of the motor motor to the appropriat appropriatee adapter plate. plate. Select Select and place the appropriate support pads on a flat horizontal test surface, table, or structure. Place tthe he motor and adapter plate plate on the support pads. The motor shaft must be vertical and in the in service orientation. Reposition the pads or motor/plate to t o obtain ob tain a stable stable test environment. environment. 13.13.8 – Other Mounting and Setup Recommendations

A. Use a test table, table, surface, surface, or structure which is of substa substantial ntial construction and free from vibration. B. Place Place the proper resil resilie ient nt pads on the test surfa surface. ce. C. As required, place place the base fixture fixture (if (if separate) on the pads pads.. D. Place the motor squarely squarely on the fixture fixture so that the fixture fixture is is reasonably reasonably level, within +/- 0.125 inches. E. Unless Unless otherwise otherwise specifi specified, ed, fit the the shaft keyway keyway with with a standard half half key, secured by tape or other suitable means. F. Safety is always always a concern. Steady larger larger machines machines and vertical vertical machines mach ines during during startup to avoid the danger of being being overturned or otherwise othe rwise becoming unstable. Relax stabilizing stabilizing fixtures while while testing so as not to alter the test results.   13.14 – Acceptance Limits This website stores data suchmaximum as A. those The maximu m ow Line Linefor Amplitude Ampl itudeunder of vibration in each band in all directions shallornot exceed excee d bel motors no external load operating at 675 RPM faster. cookies to enable essential sitelisted below functionality, as well as marketing, Band Frequency Range  personalization, and analytics. You Standard Motor  may change your settings at any time  1 (0.3 – 0.8) x Running Speed 0.05 or accept the default settings.

inch/second peak   2 (0.8 – 1.2) x Running Speed inch/second peak   3 (1.2 – 3.5) x Running Speed inch/second peak   4 (3.5 – 8.5) x Running Speed inch/second peak   5 8.5 x Running Speed – 1000 Hz

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inch/second peak   6 1000 Hz – 2000 Hz inch/second peak 

0.08 0.05 0.03 0.03 0.03

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B. The maximum maximum band band limited limited overall vibration vibration in each band in all all dir directions ections shall shall not exceed those listed below below for motors under no external load operating at 675 RPM or faster. Band Frequency Range  Standard Motor 

 1  peak 

0.3 x Running Speed – 5000 Hz

0.8 g’s

13.15 – Standard Keys For vibration testing and balancing purposes, a “half” key must be secured in the unused key seat(s) on the rotating rota ting component. Upon assembly assembly of of keyed parts to the shaft, a standard key will will be used unless requested reque sted otherwise oth erwise by the User. For those thos e cases where the key design or style does not fit the standard conventions, special consideration must be employed to follow the intent of the standard “half” key and standard key as referenced in Section 9.1.1.1. 14. Painting

A. Al Alll accessible accessible bare metal surfaces surfaces (includi (including ng weld beads applied applied during repair) should be thoroughly thor oughly cleaned and prime prime painted. Unless the User specifies specifies otherwise, finish finish paint paint can be chosen by the Repair Facility Facility.. Provide and mark a clean area for vibration probes as required. B. Exposed machined machined surfaces surfaces (such (such as shaft shaft extensions) extensions) should should be coated with a rust-preventive rust-preventive coating unless the machine is to be returned re turned to t o service immediately immediately.. Areas for vibration probes will  be clean. clean. 15. Final Inspection Inspection and Shipping Preparations •

Visually inspect the shaft, keyway, junction boxes and motor exterior for any defect or abnormality.



Check for lead identification as per the incoming markings.



Make sure the nameplate is complete and legible. legible. If no nameplate exists exists a new one must be completed and attached to the motor.



On motors with sleeve bearings, the shaft must be blocked to prevent vertical and axial

This website stores data such as movements while in transit. cookies to enable essential site functionality, as well as marketing, 16. Shipping Precautions personalization, and analytics. You may change your settings at any time   the A. default For settings. eithe eitherr rail railcar car or hi highwa ghway y truck trans transportatio portation, n, rotor/shaft rotor/shaft assemb assembli lies es of sleev sleeve-bea e-beari ring ng or accept

motor s should be blocked for shipment. motors shipment. All oil is is drained from bearing housing and tagged “ADD OIL BEFORE STARTUP”. The shaft should be restrained against either endwise, sidewise, sidewise, or upand-down wn movement caused by impact. Screws, clamps, plates, or other blocking means should Privacy Policy and-do  be clearly clearly identi identifie fied d for removal before the motor is started. Marketing

B.

Vertical ertical-sh -shaft aft motors motors or motors having having antif antifri rictio ction n bearing bearingss need not be bl blocked ocked for ship shipme ment nt  provided one bearing bearing is ““fi fixed” xed” as part of the normal assemb assembly ly.. Vertical motors are to be shipped shipped Analytics in the vertical position. Personalization

C.

Save

Motors Moto rsAccept having havingAllantifriction bearings need not be blocked for shipment provided one bearing is “fixed” as part of the normal assembly.

17. Field Repairs

 NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

First issue issue:: 1/1/99

Page 31

 

Although this recommended practice is intended to apply to repairs that are accomplished in a Repair Facility, Facility, it is recognized that th at repairs can and will be made at the installation installation location. For those tho se cases, not all of the clauses of this document will apply. apply. Others, however, ho wever, should still still be be required. These can be handled on a job-by-job basis through communication between the User and Repair Facility.

 Appendix A 

AC MOTOR INCOMING CHECK LIST

 

CUSTOMER  _______   _______   __________  _______ ___

JOB # .____________________   

DATE DATE ________________________ 

EMPLOYEE NO._______  1. MEGGER TEST. STATOR STATOR - VOLT VOLTAGE________________ RESUL RESULTS_____________________MEGS. TS_____________________MEGS.  

WOUND ROTOR/SYN. - VOLTAGE ________________ RESUL RESULTS_____________________MEGS. TS_____________________MEGS.

2. SPIN SHAFT AND CHECK TIR RUNOUT (RECORD).______________________  3. PUT REDUCED VOL VOLT TAGE SINGLE S INGLE PHASE ON MOTOR-25% OF RATED, TO CHECK FOR A DEFLECTION IN THE METER FOR OPEN ROTOR BARS. 4. IF ABOVE TESTS OKAY, RUN MOTOR NO-LOAD AND RECORD DATA. VOLTAGE_______________ RPM_____________ VOLTAGE_______________ BRG.TEMP__________DE_______ODE

CURRENT____________

5. ON SLIP RING ROTORS, CHECK SECO SECONDARY NDARY VOL VOLT TAGE AND RECORD________________________  6. RECORD AND REMOVE COUPLING, IF NEEDED. 7. DISASSEMBLE MOTOR. 8. IF IT HAS HEATERS, RECORD VO VOL LTAGE AND WA WATTS, AND DR DRA AW WIRING DIAGRAM. 9. CHECK ALL BEARING SIZES, FITS, F ITS, AND RECORD ALL NUM NUMBERS BERS ON JOB SHEET. 10. RECORD ALL BROKEN BOLTS, T-BOXES, EYE BOLTS, AND

This website stores suchVISUAL as ANYdata OTHER PROBLEMS THAT ARE SEEN ON THE MOTOR. 11. RECORD ALL SPACERS, SNAP-RINGS, SPACERS, AND SEALS WHERE THEY BELONG. cookies to enable essential site 12. IFas MEGGERS TO SPECIFICATION, SPECIFICATION, PROCEED WITH SURGE OR PHASE BALANCE AT 25% functionality, well as marketing,   OF RA RATED TED VOLTAGE. VOLT personalization, and analytics. You AGE. may change your settings at any time RESULTS:__________________________________ RESUL TS:____________________________________________(SURGE/PHASE __________(SURGE/PHASE VOL VOLT TAGE)___________AC or accept the default settings. 13. PUT ALUMINUM TAGS TAGS ON LEADS BEFORE STEAM/BA STEAM/BAKE. KE. 14. NOTE ON JOB SHEET IF THE WINDINGS ARE FLARED, LENGTH OF COIL EXTENSIONS, Privacy Policy LEAD-NUMBERS, AND IF THERE ARE INTERNAL AIR AIR SHIELDS, AND FANS. 15. STAMP JOB NUMBER BY NAME PLATE OR ON A FLAT SPOT BY THE EYE BOLT. Marketing   FOR THE ROTOR, STAMP STAMP NUMBER ON END OF SHAFT (ODE END). 16. CHECK AND RECORD ALL RTD’S, RTD’S, RES RESIST ISTANCES, ANCES, AND HEA HEATERS. TERS. Personalization

Analytics  _________________________________________________________________________________  _______________________________________ _____________________________________________________  ___________   _________________________________________________________________________________  _______________________________________ _____________________________________________________  ___________  Save Accept All  NOTES:______________________________________________________________  NOTES:___________________ __________________________________________________________________  _______________________  SUPERVISOR___________________________________________________DATE________________ 

 NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

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Page 32

 

 Appendix B 

AC MOTOR  D  DATA SUMMARY

Cust Cu stom omer er ____ ______ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ __

Job# Job# __ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____  __ 

Motor ID Tag # ________ ___________ _______ ________ ________ ________ ________ ____

Date Date rece receiv ived ed _______ ___________ ________ _______  ___ 

Seria Ser iall Numb Number er ________ ____________ ________ _______ _______ ________ ________ _____ _

Shop ID nu numb mber er _______ ___________ ________ _____  _ 

Tempe emperat ratur uree _______ _________ _____ _____ ____ __

Hum Humidity dity ____ _______ _____ _____ _____ ____  __ 

Surge test ____ _______ ________ _______ ____

passed _______ _______ _____

failed ______ _______ _____ 

Before

After

 

Voltage Megohms Microamps Tester Init. H=Shielded, O=Open Bearings *Indicate: S=sealed, H=Shielded, Drive-end bearing Opposite drive-end bearing Found Left Found Left Bearing size Shaft size Mfgr. Type* Model # # Balls/Rollers Tester Init. Init .

Vertical

0°/180°

Rotor Air Gap Before Opp. Drive end Drive end / /

This website stores data such as 60°/240° 120°/300° cookies to enable essential site # Rotor Bars functionality, as well as marketing, personalization, and analytics. # Stator Slots You may change your settings at any time Tester Init. Init . or accept the default settings.

Heat He ater er Volta oltage ge ____ ______ ___ _

Privacy Policy

/ /

Watta attage ge ____ ______ __

/ /

After Opp. Drive end /

  Drive end /

/ /

RTD type type ____ ______ ____ ____ ____ ___  _ 

Cause of Failure/Notes/Comments: (Appendi (Appendix x B-1)______________________________  B-1)_______________________ _______ 

Marketing

Personalization Analytics Save

Accept All

/ /

AC MOTORS

 Appendix B 1  NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

First issue issue:: 1/1/99

 

F AILURE  A NALYSIS  C AUSES 

01.

MOTOR  M  MISALIGNMENT

02.

COUPLING DEFECTIVE

03.

BRAKE WHEEL DEFECTIVE

04. 05.

DAMAGED SHAFT MOTOR   F FRAME DAMAGED

06.

BROKEN OR  M  MISSING FEET

07.

MOTOR  W  WET

08.

MOTOR   E EXCESSIVELY DIRTY

09.

FIELD COILS SHORTED

10.

FIELD COILS GROUNDED

11.

SHORTED OR   G GROUNDED ARMATURE

12.

MOTOR   L LAMINATIONS  LOOSE

13.

EXCESSIVE VIBRATIONS

14. 15.

ROTOR      D DAMAGED MOTOR   S STALLED

16.

SHORTED OR   G GROUNDED STATOR  C  COILS

17.

COMMUTATOR   D DAMAGED

18.

ROTOR     / ARMATUR E OUT OF BALANCE  /

19.

MOTOR   S SINGLE PHASED

20.

LAMINATION DAMAGE

21.

MOTOR   O OVERLOADED

22.

BEARING FAILURE – I NSUFFICIENT LUBRICATION 

23. BEARING FAILURE – E XCESSIVE LUBRICATION This website stores data such as 24. BEARING FAILURE – DEFECTIVE BEARINGS cookies to enable essential site functionality, as marketing, 25. as well BEARING  FAILURE – AGE (FATIGUE) personalization, and analytics. You 26. PULLED FOR  P  PREVENTIVE MAINTENANCE may change your settings at any time 27the . default DAMAGED or accept settings. BRUSHHOLDERS

28.

OTOR  R  INGS DAMAGED R OTOR   R INGS

9. DAMAGED LEADS Privacy 2 Policy 30. DAMAGED GEARS Marketing

Personalization Analytics Save

Accept All

Page 33

 NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

First issue issue:: 1/1/99

Page 34

 

 Appendix C 

 

AC MOTORS

Page 1 of 2

M  ECHANICAL  I NSPECTION  F OR    M OTORS  A S  R   ECEIVED 

TOTAL INDICATED RUNOUTS DIAGRAM POSITION

CUSTOMER ____________ 

VISUAL CONDITION OF SHAFT, BEARINGS & SEALS

OUTPUT A________ COLLECTOR RINGS BRUSH SIZE OUTER SEAL AREA B________ Collector ri ng B r us h BEARING FIT C________   INNER S SE EAL AREA D________ Diamete r________________Mfg.______________   ROTOR BODY E________   ROTOR BODY F________   ROTOR BODY G________   KEYWAY DIMENSIONS INNER SEAL AREA H________ “A” OUTPUT WDTH_________DEPTH________LENGTH_______  BEARING FIT I________ “K” OUTPUT WIDTH_________DEPTH________LENGTH_______  OUTER SEAL AREA J________  AUX. OUTPUT K_______ INSTRUMENT DIMENSIONS & CLEARANCES   INBOARD (PE) OUTBOARD (OPE)

This website stores data such as I.D. BRG cookies to enable essential site JOURNAL DIA functionality, as well as marketing, CLEARANCE personalization, and analytics. You I.D. BRG HSG may change your settings at any O.D. time BRG or accept the default settings. FIT + OR –  HOUSING/CARTRIDGE HOUSING/CAR TRIDGE F FIT IT +ORI.D. SEAL SHAFT SEAL AREA Privacy Policy CLEARANCE Marketing

 __________________________   __________________________   __________________________   __________________________   __________________________   __________________________  #1____________ #1____________ #1____________

#2_____________  #2_____________  #2_____________ 

I.D. BRG JOURNAL DIA CLEARANCE I.D. BRG HSG O.D. BRG FIT +OR FIT +OR #3_____________  #3_____________  #3_____________ 

 __________________   __________________   __________________   __________________   __________________   __________________   __________________  #4________________  #4________________  #4________________ 

OUTPUT SHAFTS POSITION ON SHAFT – FLUSH, PAST POSITION ON SHAFT – FLUSH, Personalization FLUSH, FROM FLUSH  _______________  PAST FLUSH, FROM FLUSH  ______________  Analytics (POSITION “K”) DIA  _______________  (POSITION “A’) DIA.  ______________ 

Save

COUPLING I.D.  ______________   ______________  INTERFERENCE Accept All

COUPLING I.D.  _______________   _______________  INTERFERENCE

 Appendix C    NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

AC MOTORS First issue issue:: 1/1/99

Page 35

 

Page 2/ of 2 OTHER OR SPECIAL ATTENTION TO: _________________________________________________________________ 

 _________________________________________________________________________________  _______________________________________ ____________________________________________________________  __________________   _ 

 _______________________________________ ____________________________________________________________   _________________________________________________________________________________ __________________   _ 

INSPECTED BY _____________________________________________ DATE______________________ 

This website stores data such as cookies to enable essential site functionality, as well as marketing, personalization, and analytics. You may change your settings at any time or accept the default settings.

Privacy Policy Marketing Personalization Analytics Save

Accept All

 NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

First issue issue:: 1/1/99

Page 36

 

AC MOTOR  S  STRIP R EPORT EPORT

 Appendix D PAGE 1 OF 2

SERVICE SHOP ___________________ CUSTOMER _________________________ JOB NO._____________ DATE_________ 

MOTOR  DATA MFGR __________________________ HP ___________________ SERIAL NO. ______________________  RPM _________________________ FRAME __________________ Equipment name _____________________ 

STATOR  WINDING CONDITION/PROBLEMS FOUND

CORRECTIVE ACTIONS PROPOSED

MATERIAL MA TERIAL COST $___________________

LABOR COST $________________ 

R OTOR  OTOR  AND SHAFT CONDITION/PROBLEMS FOUND

CORRECTIVE ACTIONS PROPOSED

MATERIAL MA TERIAL COST $_____________________

LABOR COST $______________________ 

STATOR STA TOR FRAME, BEARING B BRACKETS, RACKETS, BEARINGS, SEALS, MISC. CONDITION/PROBLEMS FOUND

CORRECTIVE ACTIONS PROPOSED

This website stores data such as MATERIAL MA TERIAL COST $_____________________ LABOR COST $______________________  cookies to enable essential site WORK TO BE SUBCONTRACTED functionality, as well as marketing, VENDOR _________________________  personalization, and analytics. You DESCRIPTION OF WORK may change your settings at any time  _________________________________________________________________________________  _______________________________________ ____________________________________________________________  __________________  or accept the default settings. COST $________________________  VENDOR _________________________  Privacy DESCRIPTION Policy OF WORK  _________________________________________________________________________________  _______________________________________ _____________________________________________  ___  Marketing

Personalization SERVIC SER VICE E SHO SHOP P SIGNA SIGNATU TURE RE ______ __________ _______ _______ _______ _______ _______ ___ Analytics Save

Accept All

COST $________________________  DA DATE TE ___ ______ ______ _______ _______ _______ ________ _____  _ 

 NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

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Page 37

 

 Appendix D 

AC MOTOR  D  DATA STRIP R EPORT EPORT

PAGE 2 OF 2

JOB# ____________________  ELECTRICAL / MECHANICAL  ______________________________________________________________________________   _______________________________________ _______________________________________    NAME DATE DATE PHONE COMMENTS:

OWNER SIGNATURE SIGNATURE ________________________________  ___________________________ _____  OTHER  _______________________________________ ____________________________________________________________   _________________________________________________________________________________ __________________   _    NAME DATE DA TE PHONE COMMENTS:

OTHER SIGNATURE SIGNATURE __________________________ _______________________________  _____ 

COST OF LABOR

$

COST OF MATERIAL

$

COST OF LABOR FOR ADDITIONAL REPAIR

$

COST CO ST OF MATERI TERIAL AL FOR AD ADDI DITI TION ONAL AL REP REPAI AIR R This website stores data such as cookies to enable essential site COST OF SUBCONTRACTED REPAIR functionality, as well as marketing, COST OF SHIPPING personalization, and analytics. You may change your settings at any time or accept the default settings. TOTAL COST

$ $ $ $

DATE DA TE OF RETURN DELIVERY ___________________________ 

Privacy Policy

REPAIR AUTHORIZA AUTHORI ZATION TION

Marketing

OWNER _________________________________________________________________________________________  Personalization  NAME DATE DATE PHONE Analytics DEPAR DEP ARTMENT/PURCHASING TMENT/PURCHASING SIGNATURE SIGNATURE __________________________ 

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Accept All

 NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

First issue issue:: 1/1/99

Page 38

 

 Appendix E  

AC MOTOR  R   R EPAIR   R EPORT EPAIR  R  EPORT FORM

Cust Cu stom omer er ____ ______ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ __

Job# Job# ____ ______ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ___  _ 

Motor Mo tor ID/T ID/Tag ag Num Number ber _____ _______ ____ ____ ____ ____ ____ ___ _

Date Date ____ ______ ____ ____ ____ ___ _ Vert ertical ical__ ____ ____ ____ ____  __ 

Seria Ser iall Num Number ber _____ ________ _____ _____ ______ _____ _____ _____ ____ __

Appl Applic icat atio ion_ n___ _____ _____ __ Horiz Horiz.. _____ _______ _____ ____  _ 

MFG

hp/kW

Frame

Type

Style

Power  Factor 

Exciter A

Voltage

Amps

Phase

Hz

RPM

Insulation class

Form/random wound

Design

Code

Exciter V

Secondary A Secondary V

Temper erat atur uree ris rise

Enclosure

Model

Service factor  

Ambient temp temper erat atur uree

Work Performed: Circle the appropriate items below or fill in as necessary.

STATOR:

Rewind

Retreat

STATOR SHORTED IRON:

Yes

No

SURGE TEST

Yes

No

Clean and Paint

If found shorted, action taken: _____________________________________________________  ROTOR SINGLE-PHASE TEST:

Good

Bad

SURGE TEST

Yes

No

This website stores data such as action taken: _____________________________________________________________  cookies If to bad, R Oenable TOR: essential site Rebuild Rewind Retreat Clean and Paint functionality, as well as marketing, ARMATand URanalytics. E OR FIE LDS: Rewind Retreat Clean and Paint personalization, You may change LEAyour DS: settings at any time Repair Replace Seal or accept the default settings.

BRUSH HOLDERS:

Reinsulate

Repair

Replace

Clean

SLIP RINGS:

Repair

Rebuild

Replace

Turn

METAL WORK:

Housing

Journal

Other:

Sealed

Shielded

Open

Privacy Policy

Marketing

ANTIFRICTION BEARINGS: (Indicate type:)

Personalization SLEEVE BEARINGS:

Rebuild

Replace

Scrape

Reinsulate

Analytics BEARING SEAL:

Rebuild

Replace

Remachine

Reset

FRAME SEAAccept L: Save All

Rebuild

Replace

Remachine

Reset

 NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

First issue issue:: 1/1/99

Page 39

 

 Appendix F   Appendix

AC MOTORS

Page 1 of 2 MECHANICAL INSPECTION INSPECTION FOR MOTORS AS COMPLETED CUSTOMER ______________ 

TOTAL INDICATED INDI CATED R RUNOUT UNOUTS S DIAGRAM POSITION OUTPUT A________

VISUAL CONDITION OF SHAFT, BEARING & SEALS COLLECTOR RINGS BRUSH SIZE

OUTER SEAL AREA B________ Collector ri ng B r us h BEARING FIT C________   INNER S SE EAL AREA D________ Diamete r________________Mfg.______________   ROTOR BODY E________   ROTOR BODY F________   ROTOR BODY G________   KEYWAY DIMENSIONS INNER SEAL AREA H________ “A” OUTPUT WDTH_________DEPTH________LENGTH_______  BEARING FIT I________ “K” OUTPUT WIDTH_________DEPTH________LENGTH_______  OUTER TER SEAL AREA J______ _____ __  AUX. OUTPUT K_______ INSTRUMENT ID’S:_______________________________________  DIMENSIONS & CLEARANCES   INBOARD (PE) OUTBOARD (OPE)

This website stores data such as I.D. BRG cookies to enable essential site JOURNAL DIA functionality, as well as marketing, CLEARANCE personalization, and analytics.I.D. YouBRG HSG may change your settings at any time O.D. BRG or accept the default settings. FIT + OR –  HOUSING/CARTRIDGE HOUSING/CAR TRIDGE FIT +ORI.D. SEAL Privacy Policy SHAFT SEAL AREA CLEARANCE Marketing

 __________________________   __________________________   __________________________   __________________________   __________________________   __________________________   __________________________  #1____________ #2_____________  #1____________ #2_____________  #1____________ #2_____________ 

I.D. BRG JOURNAL DIA CLEARANCE I.D. BRG HSG O.D. BRG FIT +OR FIT +OR #3_____________  #3_____________  #3_____________ 

 __________________   __________________   __________________   __________________   __________________   __________________   __________________  #4________________  #4________________  #4________________ 

OUTPUT SHAFTS Personalization POSITION ON SHAFT – FLUSH, POSITION ON SHAFT – FLUSH, PAST PAST  ______________  PAST FLUSH, FROM FLUSH  _______________  FLUSH, FROM FLUSH Analytics (POSITION “A’) DIA.  ______________  (POSITION “K”) DIA  _______________ 

Save

COUPLING I.D.  ______________  Accept All INTERFERENCE  ______________ 

COUPLING I.D.  _______________  INTERFERENCE  _______________ 

AC MOTORS

Page 2 of 2  NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

First issue issue:: 1/1/99

Page 40

 

OTHER OR SPECIAL A ATTENTION TTENTION TO:  _________________________________________________________________________________  _______________________________________ ____________________________________________________________  __________________   _ 

 _________________________________________________________________________________  _______________________________________ ____________________________________________________________  __________________   _ 

INSPECTED BY _____________________________________________ DATE______________________ 

 Appendix F-1 SLEEVE BEARING DIMENSIONS

B

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C

 NWIBRT  NWIBR TA AC C Motor Motor Sp Spec. ec. Revised Revised 10/18/05

  Page 41

First issue issue:: 1/1/99

 

 Appendix G 

AC MOTORS

DYNAMIC BALANCE CERTIFICATE Vendor endor __ ____ _____ _____ _____ ______ _____ _____ _____ _____ _____ _____ ____ _

Bala Balanc ncee Date__ Date____ _____ _____ __

Motor Tag # __________________________

Tim ime_ e___ _____  ___ 

Vendor No. ______________ 

Equipment Equipme nt balanced _____________________________________ __________________________________________________  _____________  Balance Balan ce Machine Machine Model No. ______________ ___________ ___

Last Calibration Calibration Date: __________ 

Balance Balan ce Machine Machine Serial No. __________________________  Rotor Weight Weight __________________; Rotor Ro tor “In Service” Speed (RPM) ________  Balance Speed (RPM) __________________________  Radius of permanent permanent balance balance weight weight (in.) (in.) ___________DE, ______________ODE. As Found Balance: Balance: (oz.in.*) _____________________DE, __________________ODE. As Left Balance: (oz.in.*) ______________________DE, __________________ODE. Calculated Calcu lated acceptance limi limitt per journal (4W/N): (4W/N): ___________DE, _________ODE. * If oz.in. value is not available for “As Found Balance” and “As Left Balance”, use the mils value. Count of of Rotor Bars: ___________________  Rotor Type: Cast Aluminum Aluminum     Fabricated Aluminum Aluminum This website stores data such as Fabricated Fabri cated site Copper  Copp er    cookies to enable essential Wound   functionality, as well as marketing,   _______________________  personalization, Other and analytics. You may change your settings at any time or accept the default settings.

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