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    Rev. Date 1/13/05 BULLETIN ED-6-6

    B

    ULLETIN ED-6-6

    AC Wound Rotor Motors

    INST

    ALLATION

    LOCA

    TION. The main considerations in locating amotor are air circulation and environment. The location

    must be such that adequate motor ventilation isassured. If the motor is to be located in an extremely

    adverse environment, for example with abrasiveparticles or corrosive elements in the surrounding air,

    consult the factory for information on protecting themotor.

    MOUNTING. The motor should be securely mounted toa firm foundation, as close to the machinery to be driven

    as possible, and grouted if necessary. These motors aredesigned primarily for direct coupling to the devicebeing driven. Refer to separate data sheets for motor

    dimensions, and install a flexible coupling between themotor and the machinery according to the instructions

    furnished by the coupling manufacturer.

    If the motor is to be used in an application which is

    chain, belt or gear coupled, contact the factory for thenecessary sprocket, sheave, pulley or gear size

    requirements.

    POWER CONNECTIONS. Check the power supply to

    make sure it conforms with the nameplate values.Motors will operate successfully under running

    conditions at rated load with a variation in voltage up to 10 per cent of the rated voltage, provided that the linefrequency matches the rated frequency. A Variation in

    frequency up to 5 per cent of the rated frequency isallowed without appreciably affecting operating

    efficiency under running conditions at rated load and atrated voltage. Performance within the above voltage

    and frequency variations, however, may well be belowthe standards established for operation at rated voltageand frequency. It should be noted that voltage and

    frequency variations become more critical as motorspeed decreases or number of poles increases.

    Motors that are furnished as dual-voltage motors can beconnected for either operating voltage by following the

    instructions on the connection diagram attached to themotor.

    ! DANGERWARNING

    Hazar

    dous voltage can cause burns, injury,

    or death. Disconnect, lock open, and tag thepower source which feeds this device toprevent power from being applied while

    inspection and repairs are being performed.

    Disconnect, loc

    k open, and tag the power source which

    feeds this device to prevent power from being appliedwhile inspection and repairs are being performed.

    If the direction of rotation of a 3-phase motor isincorrect, reverse any two of the three line leads to the

    stator at the motor or motor controller. If the direction orotation of a 2-phase motor is incorrect, reverse the two

    motor stator leads of one phase, either at the line or atthe motor controller.

    The motor, control winding, overload protection, and

    grounding should be in accordance with the NationaElectr ical Codes (latest issue), state and loca

    regulations.

    INITIAL LUBRICATION. Although all motors are fullylubricated prior to leaving the factory, it is recommendedthat a small amount of grease be added to the bearing

    capsules of larger motors soon after placing the motoin operation. Refer to the topic, Relubricating Externally

    Lubricated Bearings, for the correct procedure.

    DRAIN HOLES AND PLUGS. One or two drain holes

    are provided in most motors. These holes are located inthe bottom of the frame near the head ends, at the

    lowest points. The purpose of the drain holes is toprevent accumulations of moisture inside the motor

    Therefore, the drain holes should be left open, exceptwhere a motor is located in an extremely dirty or dustyatmosphere. Where heavy concentrations of dirt or dus

    are present, plug the drain holes with threaded pipeplugs.

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    AC Wound Rotor Motors

    NOTICE

    It is especially impor

    tant that these drain holesbe lef t open on motors used in marine

    applications.

    MAINTENANCE

    GENERAL.

    I t is recommended that a per iodicinspection schedule be set up to inspect and clean themotor. Forms are provided at the back of this manual for

    the purpose of recording test results and otherimportant motor information. These forms should be

    copied, completed, and included as part of a permanentrecord of the motor.

    The following points should be kept in mind wheninspecting the motor:

    ! DANGERWARNING

    Hazar

    dous voltage can cause burns, injury,

    or death. Disconnect, lock open, and tag thepower source which feeds this device to

    prevent power from being applied whileinspection and repairs are being performed.

    Disconnect, loc

    k open, and tag the power source whichfeeds this device to prevent power from being appliedwhile inspection and repairs are being performed.

    ! DANGERWARNING

    Compressed air can cause injur

    y or death.

    When cleaning the motor with compressedair, do not exceed 50 psi air pressure or

    damage will result to the windings or othermotor parts. Wear appropriate protective

    clothing, safety glasses, and face maskswhen using compressed air to clean or dryparts and equipment.

    1.

    The motor should be blown out with filtered, drycompressed air (50 psi maximum), or vacuumed at

    least once each year (more often if conditions

    warrant) to keep the motor free of dust or othercontaminants. Using a clean cloth wipe any dirtfrom the slip ring assembly, so that a short circuit

    cannot be established between the slip rings. Neverallow oil or grease to get on slip ring or brushes.Failure to observe this precaution will result in slip

    ring and brush problems.

    ! DANGERWARNING

    Hazar

    dous voltage can cause burns, injury,or death. Disconnect, lock open, and tag thepower source which feeds this device to

    prevent power from being applied while

    inspection and repairs are being performed.

    2.

    Disconnect, lock open, and tag the power sourcethat feeds this device to prevent power from being

    applied while inspection and repairs are beingperformed, and to prevent damage to the

    semiconductors while performing the following step.

    3. The stator and rotor should be subjected to an

    insulation resistance test using a 500-volt megger.The insulation resistance between the rotor andstator windings and ground should not be less than

    1 megohm for windings up to 600 volts. For highervol tage windings, the min imum insulat ion

    resistance can be calculated using the followingformula:

    4. Inspect the banding for tightness.

    5. Check the flexible copper brush shunt to be sure

    that the pig tail lug is securely fastened to the brushholder (refer to the topic, Brush Service).

    NOTICE

    Oil on the br

    ushes will cause problems and

    reduce brush life. Make sure your hands areclean when handling the brushes. Avoid

    touching the bottom and side of brushes toprevent oil from your hands getting on the brush

    surface.

    6. When replacing or renewing the brushes, carefully

    fit the brushes to the contour of the slip rings with#00 sandpaper (never use emery cloth, as emery

    grit is a conductor). After seating the brushes,

    remove them from the holders and clean thebrushes and brush holder to ensure free movement

    of the brushes in the holders. Be sure to blow thecarbon dust from the motor after sanding the

    brushes.

    7. The slip rings must be kept clean, smooth and

    concentr ic. They can be cleaned with #00sandpaper or a commutator stone.

    Rated Voltage

    Rated KVA100

    + 1000= Megohms

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    BULLETIN ED-6-6

    3

    8.

    If the slip rings are rough or pitted, smooth them

    with fine sandpaper, cut them with a lathe, or grindthem with a fine stone. Then polish the slip ringsusing #00 or #000 sandpaper.

    9. Make frequent checks of the motor for unusual

    noises or vibration. These conditions may indicatebearing failure.

    10. If a rough or otherwise defective bearing issuspected, it should be replaced as soon aspossible.

    BEARING LUBRICA

    TION

    GENERAL.

    Experience shows that one of the major

    causes of motor failure is related to the bearings.Therefore, great care must be taken to ensure proper

    lubr icat ion and maintenance of the bear ings.Cleanliness is especially important. Use every

    precaution in keeping the grease clean while in storage

    and during the time is necessary to have the greasecontainer open, and also to avoid introducing dirt or

    other fore ign mat ter in to the bear ings whenrelubricating.

    Two basic types of bearings are used: sealed (orshielded); and externally lubricated, enclosed in a

    capsule. Sealed bearings are used on all smallermotors, as well as some specially designed larger

    motors. Externally lubricated bearings are used onlarger motors of standard design. Separate procedures

    for relubricating both types of bearings are outlinedbelow.

    RECOMMENDED LUBRICANTS. Bearings of allmotors are lubricated prior to leaving the factory withgrease specifically suited for the motor type and

    application. It is imperative that the same type oflubricant continue to be used.

    Class F and H insulated motors, except those usedin a high temperature environment, require a high

    quality #2EP NLGI multi-purpose grease, meeting P&Hspecification #472.

    Class H insulated motors used in a high-temperatureenvironment require a high- quality, high-temperature

    grease, conforming to P&H specification #476.

    For lubricants suitable for use in extremely low ambient

    temperatures (-10 F, or lower, for periods of 72 hours orlonger), consult the factory.

    RELUBRICATION INTERVALS. Ideal intervals betweenrelubrications of the motor bearings will vary according

    to the type and size, severity of operation (duty cycle,loads, etc.) and operating environment. Use the

    following guidelines in determining relubrication

    intervals:

    NOTICE

    Excessiv

    e grease can be almost as detrimentalas inadequate lubrication. Excessive grease in

    a bearing or bearing capsule will cause thebearing to overheat. Overheating results in

    shorter bearing life.

    Sealed bearings are packed with sufficient grease to

    permit the motor to operate for an extended periodbefore relubricating the bearings. In light-dutyapplications, and when operating intermittently in clean

    and dry atmospheres where ambient temperatures donot exceed 100 F (40 C), sealed bearings need only

    be relubricated every 10,000 operating hours or threeyears, whichever comes first. For continuous or heavy-

    duty operation, in a clean, dry and relatively coo

    environment, shorten the relubrication interval to 2,000hours or one year. When operat ing in severe

    environments (corrosive or extremely dirty atmospherehigh ambient temperatures, etc.), the relubrication

    interval must be further shortened. The actual interval inthis case can be determined on the basis of experience

    with other motors in similar environments.

    Large motors equipped with externally lubricated

    bearings that are enclosed in a capsule, when used in alight or moderate-duty application and in clean, dry

    atmosphere, should be relubricated according to theschedule in Table 1. When operating in heavy-duty

    applications and/or in more severe environments (suchas encountered in chemical plants), the interval must beshortened. The intervals in this case can either be

    determined by experience with similar conditions, or byperiodically analyzing samples of the grease from the

    bearing chambers. This analysis, which most lubricansuppliers can perform or arrange for, is for the purposeof determining the contamination level in the grease

    Once a critical contamination level is reached, thebearings must be relubricated as soon as possible. A

    series of analyses need only be made once for a motoror a group or motors operating under the same

    conditions. The time required for contamination to reach

    a critical level will serve as a basis for determining alfuture relubrication intervals.

    NOTICE

    As indicated on the lubr

    ication instruction plateattached to each motor, bearings should be

    relubricated as shown in Table 1. This point isbrought out here because, under someoperating condit ions, it is necessary to

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    AC Wound Rotor Motors

    relubr

    icate more frequently. In some cases,even daily lubrication may be in order. For

    specific advice on relubrication intervals for aparticular motor application, consult the factory.

    T

    able 1: Bearing Lubrication Schedule

    The bear

    ings and bearing capsules must be thoroughly

    cleaned and flushed, periodically. The recommendedintervals for cleaning and flushing are provided in Step

    6 of the topic, Relubricating Externally LubricatedBearings.

    RELUBRICATING SEALED OR SHIELDEDBEARINGS. Refer to the topics, Recommended

    Lubricants and Relubrication Intervals, to determine the

    proper type of lubricant to use and the frequency atwhich the bearings should be lubricated. Sealed (orshielded) bearings should be removed from the motorand cleaned at each relubrication interval. Relubricate

    the bearings as follows (see Figure 1):

    If motor is a hoist, move the crane to a suitable parkinglocation, lower block to the floor and support the blockto prevent it from falling over. Chock drum to prevent

    rotation due to weight of cables pulling on the drum. Ifthe motor is for traverse motion on an outdoor crane,

    move the crane to a suitable parking location and chockthe wheels to prevent movement of trolley/bridge due to

    wind forces.

    NOTICE

    Use e

    xtreme care to avoid introducingcontaminants in the bearings or in the grease,

    at any stage of handling.

    ! DANGERWARNING

    Hazar

    dous voltage can cause burns, injury,or death. Disconnect, lock open, and tag the

    power source which feeds this device toprevent power from being applied whileinspection and repairs are being performed.

    1.

    Disconnect, lock open, and tag the power sourcewhich feeds this device to prevent power from beingapplied while inspection and repairs are being

    performed.

    2. Clean the exteriors of the bearings, removing all dirtand other foreign matter. Then remove the snap ring

    using a screwdriver as shown.

    3. Carefully lift the seal from the bearing by gently

    prying against the projecting flanges at the outeredge of the seal.

    4. Remove as much of the old grease as possibleusing a good quality, short, stiff bristle brush. Then,

    flush the bearing with an oil spray to remove alltraces of old grease. Hold the bearing to prevent it

    from rotating while flushing with the oil spray.

    5. Fill the bearing two-thirds full with the

    recommended lubricant. Reinstall the seals and thesnaps rings.

    NOTICE

    Sealed (or shielded) bear

    ings on motors

    featuring capsule construction for the bearingsshould have a thick film of grease applied to the

    side of the bear ings when operat ing inextremely dusty atmospheres. Motors used intaconite or mining operations are examples. A

    motor operating in extremely wet surroundingsshould also have its bearings lubricated in the

    same manner. Lubricating the sides of thebearings in these cases is in addition to the

    normal lubrication outlined above.

    RELUBRICATING EXTERNALLY LUBRICATED

    BEARINGS. Proceed as follows:

    NOTICE

    Excess g

    rease in bearing capsules usuallyworks its way past the inner shaft seals and

    contaminates the inside of the motor, and willdamage the motor. Do not over-grease the

    motor bearings.

    This information applies to externally lubricated

    bearings which are enclosed in a capsule. Following theinstructions on the lubrication plate on the outside of themotor frame, a discrete amount of grease (1/2 to 1

    ounce, depending on the size of the bearing) should beadded to each bearing according to Table 1. Refer to the

    topic, Recommended Lubricants, for the proper type oflubricant to be used. Avoid over-greasing the bearings.

    Speed

    (RPM)

    Bearing

    T

    emp. (F)

    Relubricating

    Interval

    Operating

    Hours

    Up to 600

    Up to 150 deg.

    8 to 12 mo. 2000

    600 to 1800 Up to 150 deg. 6 to 8 mo. 1000

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    5

    NOTICE

    Use e

    xtreme care to avoid introducingcontaminants in the bearings or in the grease,at any stage of the handling.

    1. Wipe the grease plugs and surrounding areas of thecapsules using a clean, dry cloth.

    2. Remove the lower plugs from both capsules, andthe upper plugs if so equipped. Some capsules areequipped with grease fittings in the upper holes.

    3. After removing the plugs, check for hardenedgrease around the openings. Remove any

    hardened grease using a wooden or plastic stick.

    4. Install a grease fitting, if applicable, in the upper

    hole of each capsule.

    5. With the motor running, pump grease into each

    capsule from a hand-operated gun until cleangrease is expelled from the lower hole. Leave the

    lower holes open and run the motor until no moregrease is expelled (20 minutes or longer). Thenreplace the plugs.

    NOTICE

    P

    erforming the previous step exactly asdescribed will ensure that the capsules containthe correct quantity of grease. Leaving the

    lower holes open and running the motor for theprescribed time purges the capsules of surplus

    grease.

    6. After every 10,000 operating hours or two years

    which ever comes first, clean and flush the bearingsusing the following procedure:

    Figure 1Relubricating Sealed Bearings

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    AC Wound Rotor Motors

    NOTICE

    If a motor has been oper

    ating in a dirty or dustyatmosphere, a contaminated environment, or in

    high-ambient temperatures, the intervalsbetween the cleanings must be shortened.

    NOTICE

    Do not rotate the motor shaft if the bear

    ing are

    not lubricated to avoid damaging the motor.

    A. Remove the old grease from both the bearing

    and the bearing capsules.

    ! DANGERWARNING

    Mineral spirit solvent fumes can cause

    injury or death. Use only in outside or well

    ventilated areas. In enclosed areas, use anon-flammable perchloroethylene or similar

    solvent.

    B

    . Wash out the capsules using a suitable solvent.

    C.Flush the bearings and bearing capsule withclean, light oil.

    D.Repack the bearings and capsules with freshgrease, of the approved type. Pack the capsules

    to a level not exceeding one-half full.

    E. Assemble the motor and complete the lubrication

    of the bearings as described in Steps 1 through5.

    BR

    USH SERVICE

    GENERAL.

    Brushes should periodically be inspected to

    ensure that they are contacting the slip rings properlyand with sufficient pressure to achieve a good electricalconnection.

    ! DANGERWARNING

    High v

    oltage can cause injury or death.

    Disconnect, lock open, and tag the powersource which feeds the motor to prevent

    power from being applied to the motor whilerepairs are being performed.

    Disconnect, loc

    k open, and tag the disconnect switchwhich feeds the motor to prevent power from being

    applied while repairs are being made.

    NOTICE

    Oil on the slip r

    ings or brushes can causeoperational problems and will reduce slip ring

    and brush life. Be sure your hands are cleanbefore handling brushes. Avoid touching

    bottom and sides of brushes.Check all brushes to ensure that they make good

    contact with the slip rings and that they move freely inthe brush holders.

    A constant pressure spring assembly is utilized on mostac motors (see Figure 2). No periodic adjustments arerequired when this type of spring is used. If for any

    reason the spring tension is lost, replace the spring andbackup plate as shown.

    While inspecting the brushes, the brush pig tail lugsshould be checked to ensure that the attaching screws

    are tight and good electrical contact is being made. Aloose screw or poor electrical connection will result in

    current flow through the brush holder spring. The springwill then eventually lose its temper and be unable to

    apply adequate pressure on the brush.

    The brushes should be replaced when they have worn

    40 to 60 per cent of their original length. The maximumallowable wear within this range is left to the judgementof the individual maintenance person.

    ADJUSTMENT. On some ac motors, an adjustable style

    brush holder is used. On this style of brush holder,brush tension will diminish as the brushes wear. The

    recommended brush tension is 3-1/2 to 4 pounds persquare inch of brush contact area. Check this tensionperiodically, and correct tension by rotating the

    adjusting pin. (See Figure 3.)

    Figure 2. Constant Pressure Brush Assembly

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    Figure 3. Adjustable Brush Holder Assembly

    Removal From Storage

    OPERATING VOLTAGE. Check the power supply to

    make sure it agrees with the nameplate data on themotor.

    CLEANING. Proceed as follows:

    ! DANGERWARNING

    Compressed air can cause injury or death.When cleaning motors, do not exceed 50 psi

    air pressure. Wear appropriate protectiveclothing, safety glasses, and face masks

    when using compressed air to clean or dryparts and equipment.

    Thoroughly clean the motor with compressed air (do notexceed 50 psi). Cleaning of the brushes and slip r ings iscovered under the topic, Cleaning Brushes.

    INSULATION RESISTANCE CHECKS. Measure

    insulation resistance of both the stator and rotor using amegger. The minimum resistance should be 1 to 2megohms. Operate the megger for a period of 3 to 4

    minutes. During this time, an increase in resistanceshould be noted. If either the initial resistance is low or

    resistance does not increase during the 3 to 4 minutesinterval as specified, some moisture has most likely

    been absorbed by the insulating material. The windingsmust then be dried as described below.

    DRYING THE WINDINGS. Three acceptable methods

    of drying windings are presented below:1. Remove the brush inspection cover and direct

    warm air from a heating unit with a blower on the

    windings inside the motor. Continue until theresistance values specified are achieved.

    ! DANGERCAUTION

    Rapid temperature buildup will cause the

    moisture in the windings to vaporize quick-ly, resulting in damage to the windings.Bring the oven temperature up slowly dur-

    ing the baking process.2. Disassemble the motor and bake the stator and

    rotor in an oven at 240-260 F until the specifiedresistance can be achieved. Be sure the grease is

    washed form the rotor bearings following the bakingprocess and replaced with fresh, clean grease. Thisprocedure is described in the preceding topic

    Bearing Lubrication.

    MOTOR STORAGE

    General

    The following information is general in nature and

    covers all sizes of ac motors. Preparation for the storagein exposed or contaminated areas is presented first.

    The balance of the information deals with preparation ofmotor for service that have been stored for an extended

    period or have been stored outside.

    Preparation for Storage

    The following steps should be taken to protect motorsduring storage in contaminated atmospheres and foroutside storage:

    1. Completely cover the motor by wrapping with twolayers of waterproof paper. Use one of the following

    products, or their equivalents: Oceanwrap Green,Kranz Company Green Core Heavyweight, StraussPaper Marvel Pak 12, or Butler Paper.

    2. To provide further protection, it is recommendedthat the brushes be lifted and a piece of vapor

    inhibiting paper be inserted between the brushesand the slip rings. For this purpose, use Strauss

    Paper Company Corrosion Retarding GreasePaper, or equal.

    NOTICE

    At least every two months during storage,

    slowly hand-rotate the motor shaft to distributethe oil in the grease, as well as to prevent

    bearing corrosion due to condensation or thepresence of corrosive gasses in the storage

    area.

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    8 AC Wound Rotor Motors

    NOTICE

    The following method involves application ofvoltage to the motor terminals. If the motor is to

    be rotated during this process, the brushes andslip rings must be checked and the rotor

    bearings must be lubricated preceding thedrying process. Fai lure to observe thisprecaution may lead to damage of the rotor

    bearings and/or slip rings.

    ! DANGERWARNING

    Hazardous voltage can cause injury ordeath. Before applying voltage to the motor

    make sure appropriate warning signs andflashing lights have been used to warn

    personnel against accidental contact withelectrical power.

    NOTICE

    Oil on brushes can cause operational problemsand will reduce brush and slip ring life. Be sure

    hands are clean before handling brushes. Donot touch sides or bottom of brushes.

    3. After the brushes and slip rings have been cleanedand the rotor bearings are properly lubricated, the

    motor can be dried by applying a low voltage to theterminals. The applied voltage should be limited to

    one-half the rated voltage if the motor is not rotated.If only a single-phase, low-voltage power source is

    available, each phase of the polyphase stator, aswell as the rotor, will need to be energizedindividually at not more than one-fourth the rated

    voltage. Continue to apply the recommendedvoltage until the minimum resistance values

    specified are achieved.

    CLEANING BRUSHES. Proceed as follows:

    ! DANGERWARNING

    Hazardous voltage can cause burns, injury,or death. Disconnect, lock open, and tag thepower source which feeds this device to

    prevent power from being applied whileinspection and repairs are being performed.

    Disconnect, lock open, and tag the power source whichfeeds this device to prevent power from being applied

    while inspection and repairs are being performed.

    NOTICE

    Oil on brushes can cause operational problemsand will reduce brush and slip ring life. Make

    sure hands are clean before handling brushes.Do not touch sides or bottom of brushes.

    Lift the brushes from the brush holders and clean thebrush boxes and brush surfaces by either wiping or

    blowing out with compressed air.

    ! DANGERWARNING

    Compressed air can cause injury or death.When cleaning motors, do not exceed 50 psiair pressure. Wear appropriate protective

    clothing, safety glasses, and face maskswhen using compressed air to clean or dry

    parts and equipment.

    Compressed air, if used, must be filtered and dry. If the

    slip rings need cleaning, polish them to a high glossusing a piece of clean canvas on the end of a wooden

    stick or use crocus cloth or fine sandpaper and oil.Never use emery cloth on bronze (or any slip rings),since emery grit is a conductor. After polishing, clean

    the rings thoroughly with a suitable solvent to remove allabrasives and foreign materials.

    INSPECTING BRUSHES. Proceed as follows:

    ! DANGERWARNING

    Hazardous voltage can cause burns, injury,or death. Disconnect, lock open, and tag the

    power source which feeds this device toprevent power from being applied while

    inspection and repairs are being performed.

    Disconnect, lock open, and tag the power source which

    feeds this device to prevent power from being appliedwhile inspection and repairs are being performed.

    NOTICE

    Oil on brushes can cause operational problemsand will reduce brush and slip ring life. Be surehands are clean before handling brushes. Do

    not touch sides or bottom of brushes.

    Be sure that the brushes move freely in the holders. If

    the motor is equipped with the adjustable type brushholder assembly (see Figure 3) measure the brush

    tension and make adjustments as necessary. Thecorrect tension is 3-1/2 to 4 pounds per square inch ofbrush contact area. Examine the slip ring surfaces for

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    BULLETIN ED-6-6 9

    corrosion or patterns etched on the slip rings where

    brushes were in contact during storage. Slip ringsurfaces can be cleaned, if necessary, as describedabove.

    BEARING LUBRICATION. Bearing grease (lubricant)

    will gradually deteriorate when the motor is idle forextended periods of time. Bearing grease will become

    contaminated during storage in dirty atmospheres oroutdoors. Deterioration, specifically, is the separation ofthe oil from the soap matrix. This leaves only the soap

    matrix, which is not in itself a good lubricant. Therefore,if the motor has been stored in a protected area for a

    period of 8 months of longer, or in a contaminatedenvironment for a period of 5 months or longer, thegrease must be removed from the bearings and

    capsules and the bearings and capsules must berelubricated with fresh, clean grease. Cleaning and

    relubricating of the bearings is discussed under thetopic, Bearing Lubrication.

    If a motor equipped with externally lubricated bearings,and enclosed in capsules, has been directly exposed to

    weather conditions during storage, for any duration, acareful check must be made for droplets of moisture inthe bearing chambers. Such moisture can either be the

    result of natural breathing of the bearing chamber orrain entering the chamber. If the grease has been

    contaminated with moisture, the contaminated greaseshould be flushed from the bearing and capsule. Then

    repack the bearing and capsule as described under thetopic, Relubricating Externally Lubricated Bearings.

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    10 AC Wound Rotor Motors

    PlantNo.

    MachineNo.

    InventoryNo.

    MotorNo.

    HP

    ManufacturedBy

    Series:

    Shunt:

    Compound:

    Synchronous

    Induction:

    Type:

    Frame:

    Speed:

    Volts:

    Amperes:

    Phase:

    Cycles:

    Temp.Rise:

    ExcitationAmps.

    R

    otororArmatuireorServiceNo.

    ModelNo.:

    FormNo.

    ManufacturersNo.:

    SerieslNo.:

    Mfgrs.OrderNo.:

    OurOrderNo.:

    Date:

    ConnectionDiagram-Rot

    ororArmature:

    Stator:

    Specification:

    OPEN

    EXP.PROOF

    DRIPPROOF

    TOTALLYENCL.

    VERTICAL

    ___________

    Be

    arings:

    SLEEVE

    BALL

    RO

    LLER

    SHAFTExten

    sion

    DIA._______________

    LENGTH___________

    KEYWAY___________

    PULLEY

    DIA._______________

    FACE___________

    G

    EAR

    TEETH.______________

    PITCH___________

    FACE___________

    VBELTDRIVE

    No.Grooves_

    ________

    PitchDia.__

    _________

    A-1/2x11

    /32

    B-21/32x

    7/16

    C-7/8X17/32

    D-1-1/4X

    3/4

    MO

    TORSERVICERECORD

    DateInstalled

    Loca

    tion

    Application

    DateRepaired

    RepairsorPartsReplaced

    Cause

    RepairedBy

    TotalCost

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    Morris Material Handling

    BULLETIN ED-6-6 1

    MOTORMAINTENAN

    CERECORD

    MotorHP

    AC

    D

    C

    Type

    Frame

    RPM

    PHASE

    CYCLES

    VOLTS

    DIVISION

    SECTION

    WINDING

    TOOLN

    O.

    MANUFACTURERSNO.

    SERIALNO.

    LOCATION-SECITON

    COL.NO.

    DATEINSTALLED

    D

    ATEINSTORAGE

    DATEINSTAL

    LED

    DATEINSTORAGE

    DATEINSTALLED

    DATEINSTORAGE

    DRIVESMACHINE

    TOOLNUMBER

    DRIVESMAC

    HINE

    TOOLNUMBER

    DRIVESMACHINE

    TOOLNUMBER

    DATE

    Blownout

    B

    earings

    EndPlay

    BRUSHES&

    HOLDER

    COMMU

    Megger

    GENERALCONDITION

    INSPECTEDBY

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    Revised 1/13/05

    12 AC Wound Rotor Motors

    OCM110-B N

    AMEOFPART

    NO.PER

    MOTOR

    MANUFACTURERS

    NUMBER

    PARTSPURCHASED

    Date

    Qty.

    TotalCostD

    ate

    Qty.

    TotalCost

    Date

    Qty.

    Total

    Cost

    RotororArmatureCoils

    StatorCoils

    FieldCoils-Shunt

    FieldCoils-Series

    FieldCoils-Cummutating

    AssembledSeg.orColl.Rings

    Brushes

    Brushholders

    BrushholderSprings

    BrushholderFingers

    Bearing-Front

    Bearing-Rear

    OilRing-Front

    OilRing-Rear