OL_P1254 Model (1) - TECO-Westinghouse Motor Company

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6. FAULT FINDING AND RECOGNITIONKinds ofBreakdownFail to startwithout loadLoading afterstartSymptomsMotionless andsoundlessFuse blowing.(Automaticswitch trips off,slow start withelectromagneticnoise)Fuse blowing.Fail to restart dueto trip-off ofautomatic switchOverheating motorPossibleCausesPower-offSwitch-offNo fuseBroken wiringBroken leadBroken windingsShort circuit of circuit switchesIncorrect wiringPoor contact at terminalWindings groundedBroken windingsPoor contact of circuit switchesBroken wiringPoor contact of starting switchesShort circuit of starting switchesIncorrect connections of startingswitchesInsufficient capacity of fuseOverloadHigh load at low voltageOverload or intermittentoverloadUnder-voltageOver-voltageVentilation duct cloggedAmbient temperature exceeds40°CFriction between rotor and statorFuse blown (Single-phaserotating)Poor contact of circuit switchesPoor contact of circuit startingswitchesUnbalance three-phase voltageRemediesConsult power companySwitch-onInstall fuseCheck wiring and repairCheck wiring and repairCheck windings and repairCheck circuit switches and replaceCheck wiring according tonameplateLock tightlyFactory repairFactory repairCheck and repairCheck and repairCheck and repairCheck and repairConnect according to nameplateReplace fuse if wiring permitsLighten loadCheck circuit capacity and reduceloadLighten loadCheck circuit capacity and powersourceCheck power sourceRemove the foreign matter in theductCorrect insulation class to B or F, orlower ambient temperatureFactory repairInstall the specified fuseCheck and repairCheck and repairCheck circuit or consult powercompany31
Kinds ofBreakdownLoadingafter startNoiseVibrationSymptomsPossibleCausesRemediesVoltage dropCheck circuit and powers sourceSpeed fallsSudden overloadCheck machinesharplySingle-phase rotatingCheck circuit and repairSwitch overheatInsufficient capacity of switchReplace switchHigh loadLighten loadHigh belt tensionAdjust belt tensionSlack belt tensionAdjust belt tensionBearing overheatingmachine shaftsMisalignment between motor andRe-alignOver speed of bearing outer-ring Adjust bracketHigh bearing noiseReplace the damaged bearingElectromagnetic Occurrence from its first operation May be normalnoise induced byShort circuit of windings should beSudden sharp noise and smokingelectricityrepaired at the factoryNoise of low shishi or Thru-Thru May be normalBearing noiseKala-Kala as a result of poor lubrication GreaseKulo-Kulo as a result of poor lubrication Clean bearing and greaseSa-Sa or larger noiseReplace the damaged bearingLoose belt sheaveAdjust key and lock the screwLoose coupling or skipAdjust the position of couplings, lockkey and screwLoose screw on fan coverLock fan cover screw tightlyMechanical noiseFan rubbingAdjust fan positioncaused bymachineryRubbing as a result of ingression of Clean motor interior and ventilationforeign matterductsWind noiseNoise induced by air flowing throughventilation ductsInduced by conveyance machine Repair machineElectromagnetic Short circuit of windingFactory repairvibration Open circuit of rotor Factory repairUnbalanced rotorFactory repairUnbalanced fanFactory repairBroken fan bladeReplace fanUnsymmetric centers between beltMechanical sheavesAlign central pointsvibration Central points of couplings do not lie on Adjust the central points of couplingsthe same levelto the same levelImproper mounting installationLock the mounting screws<strong>Motor</strong> mounting bed is not strongenoughReinforce mounting bedRemarks:(1) Circuit switches: These include knife switches, electromagnetic switches, fuse and other connectionswitches etc.(2) Starting switches: These include Delta-Star starters, compensate starters, reactance starters, resistorstarters, starting controller’s etc.32
Page 4 and 5: ISSUEDJune 18, 2007TYPEASHAPAPERFOR
Page 6: OPERATION&MAINTENANCEMANUALFORTHREE
Page 9 and 10: 2. ACCEPTING, INSPECTION, STORAGE,
Page 11 and 12: Do not use the hoisting hook/eyebol
Page 13 and 14: 3.2.4 Installation of vertical moto
Page 15 and 16: The motor shaft and the driven shaf
Page 17 and 18: ATTENTION!Place the sheave and belt
Page 19 and 20: 3.6.4The rotation direction of the
Page 21 and 22: 4.1.4 Bearing lubrication(a) For sl
Page 23 and 24: 4.2.3 Rotating direction(a) Most TW
Page 25 and 26: Owing to the varied time and circum
Page 27 and 28: (d) If the periods referred to in T
Page 29 and 30: TABLE 2.Bearing No. Amount of reple
Page 31 and 32: 5.6 Maintenance of sleeve bearings5
Page 33 and 34: (h) Roll the bottom bearing half to
Page 35 and 36: 5.7.2 Brush replacementThe carbon b
Page 37: when, on shutdown, the falling wate

OL_P1254 Model (1) - TECO-Westinghouse Motor Company

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