ABB MT series Installation And Maintenance Instruction

Brand: ABB

Model: MT series

Type: Installation And Maintenance Instruction

ABB MT series three-phase asynchronous motors are designed for industrial drive applications, offering reliable performance and energy efficiency. With insulation resistance exceeding 10 MΩ measured at 25°C, these motors ensure safe operation. They feature sturdy construction, with cast iron frames for sizes above IEC 280, providing robustness and durability. The MT series motors are suitable for various applications, including pumps, fans, compressors, and conveyors, thanks to their wide power range and mounting options.

Fläkt Woods 8265 GB 2011.10 1 Specifications are subject to alteration without notice

Installation and maintenance instruction

Fläkt Woods three phase asyncronous motor

Manufacturer: ABB

Machine Instructions



 NOTE!

 Theseinstructionsmustbefollowedtoensure

 safeandproperinstallation,operationandmain-

 tenanceofthemotor.Theyshouldbebroughtto

 theattentionofanyonewhoinstalls,operatesor

 maintainsthisequipment.Ignoringtheinstruc-

 tionmayinvalidatethewarranty.



Declaration of Conformity

DeclarationsofConformitywithrespecttotheLowvol-

tageDirective73/23/EECamendedbyDirective93/68

EECareissuedseparatelywithindividualmachines.



TheDeclarationofConformityalsosatisfiestherequire-

mentsofaDeclarationofIncorporationwithrespect

totheMachineryDirective89/392/EEC,amendedby

91/368/EEC,93/44/EECand93/68/EEC.

Validity

TheinstructionsarevalidforthefollowingABBelectrical

machinetypes,inbothmotorandgeneratoroperation.



seriesMT*,MBT*,MXMA,

seriesM2A*/M3A*,M2B*/M3B*,M2C*/M3C*,M2F*/

M3F*,M2L*/M3L*,M2M*/M3M*,M2R*/M3R*,



inframesizes63-400.



(Additionalinformationmayberequiredforsome

machinetypesduetospecialapplicationand/ordesign

considerations.)

Putting into service (starting)

Reception check

Immediatelyuponreceiptcheckthemachineforexternal

damageandiffound,informtheforwardingagentwith-

outdelay.

Checkallratingplatedata,especiallyvoltageandwinding

connection(starordelta).Thetypeofbearingisspecified

ontheratingplatefromsize112andlarger.

Turnshaftbyhandtocheckfreerotation,removetrans-

portlockingifemployed.

Motors equipped with roller bearings:Runningthe

motorwithnoradialforceappliedtotheshaftmay

damagetherollerbearing.

Motors equipped with angular contact bearing:

Runningthemotorwithnoaxialforceappliedintheright

directiontotheshaftmaydamagetheangularcontact

bearing.

Motors equipped with regreasing devices:

Whenstartingthemotorforthefirsttime,applyatleast

thespecifiedquantityofgreaseuntilnewgreaseforced

outofthegreaseoutlet.Fordetailsseesection“Machines

withrelubricationsystem”onpage6.

Insulation resistance check

Measureinsulationresistancebeforecommissioningand

whenwindingdampnessissuspected.

Resistance,measuredat25°C,shallexceedthereference

value,i.e.

10Mohm(measuredwith500VdcMegger)



Insulationresistancereferencevalueishalvedforeach

20°Criseinambienttemperature.

Ifthereferenceresistancevalueisnotattained,thewinding

istoodampandmustbeovendried.

Oventemperatureshouldbe90°Cfor12-16hoursfollowed

by105°Cfor6-8hours.

Drainholeplugs,iffitted,mustberemovedduringheating.

Windingsdrenchedinseawaternormallyneedtobe

rewound.

Direct-on-line or star/delta starting

Theterminalboxonstandardsinglespeedmachines

normallycontains6windingterminalsandatleastone

earthterminal.

Earthingmustbecarriedoutaccordingtolocalregulations

beforethemachineisconnectedtothesupplyvoltage.

Thevoltageandconnectionarestampedontheratingplate.

Direct-on-line starting (DOL):

YorΔwindingconnectionsmaybeused.eg660VY,380VΔ

indicatesY-connectionfor660VandΔ-connectionfor380V.

Star/Delta starting (Y/Δ) :

Thesupplyvoltagemustbeequaltotheratedvoltageof

themachineinΔ-connection.

Removeallconnectionlinksfromtheterminalblock.

Fortwo-speed,singlephaseandspecialmachines,supply

connectionmustfollowtheinstructionsinsidethetermi-

nalbox.

Terminals and direction of rotation

Directionofrotationisclockwisewhenviewingtheshaft

faceatthemachinedriveend,whenthelinephasesequence

L1,L2,L3isconnectedtotheterminalsasshowninthe

figure1.

Toalterthedirectionofrotation,interchangetheconnec-

tionofanytwolinecables.

Ifthemachinehasauni-directionalfan,ensurethatthe

directionofrotationisaccordingtothearrowmarkedon

themachine.

WARNING!

 Windingsshouldbedischargedimme-

 diatelyaftermeasurementtoavoidrisk

 ofelectricshock.

Fläkt Woods 8265 GB 2011.10 2 Specifications are subject to alteration without notice

Installation and maintenance instruction

Fläkt Woods three phase asyncronous motor

Manufacturer: ABB

Use

Operating conditions

Themachinesareintendedforuseinindustrialdrive

applications.

Normalambienttemperaturelimitsare-25°Cto+40°C.

Maximumaltitude1000mabovesealevel.

Safety considerations

Themachineisintendedforinstallationandusedby

qualifiedpersonnel,familiarwithrelevantsafety

requirements.

Safetyequipmentnecessaryforthepreventionof

accidentsattheinstallationandoperatingsitemustbe

providedinaccordancewiththelocalregulations.

Points to observe

1.Donotusethemachinetostepon

2.Thetemperatureoftheoutercasingofthemachine

 maybehottothetouchduringnormaloperation.

3.Somespecialmachineapplicationsrequirespecial

 instructions(e.g.usingfrequencyconvertersupplies)

4.Liftinglugsmustonlybeusedforliftingthemotor.

 Theymustnotbeusedtoliftthemotorwhenitis

 attachedtootherequipment.



Handling

Operating conditions

Themachineshouldalwaysbestoredindoors,indry,

vibrationfreeanddustfreeconditions.

Unprotectedmachinedsurfaces(shaft-endsandflanges)

shouldprotectedwithanti-corrosivepaint.

Itisrecommendedthatshaftsberotatedperiodicallyby

handtopreventgreasemigration.

Anticondensationheaters,iffitted,shouldpreferablybe

energised.

Thecharacteristicsofelectrolyticcapacitors,iffittedto

single-phasemotors,willrequire“reforming”following

periodsofstorageexceeding1-2years.

ContactABBSalesOfficefordetails.

Transportation

Machinesfittedwithcylindrical-rollerand/orangular

contactbearingsmustbefittedwithlockingdevices

duringtransport.

Lifting

Onlyliftthemotorusingtheliftinglugs.

Thecenterofgravityofmotorswiththesameframemay

WARNING!

 Smallmotorswithsupplycurrent 

 directlyswitchedbythermallysensitive

 switchescanstartautomatically.

varyduetodifferentoutputs,mountingarrangementsand

auxiliaryequipment.

Checkthateyeboltsortheliftingeyesintegratedwiththe

motorframeareundamagedbeforelifting.Damaged

liftingeyesmustnotbeused.

Liftingeyeboltsmustbetightenedbeforelifting.Ifneeded

thepositionoftheeyeboltmustbeadjustedwithsuitable

washers.

Ensurethatproperliftingequipmentisusedandthatthe

sizesofthehooksaresuitablefortheliftinglugs.

Caremustbetakennottodamageauxiliaryequipmentand

cablesattachedtothemotor.directionofrotationisaccor-

dingtothearrowmarkedonthemachine.

Machine weights

Totalmachineweightcanvarywithinthesameframesize

(centerheight)dependingondifferentoutput,mounting

arrangementsandaddedfeatures.

Thefollowingtableshowsestimatedmaximumweights

formachinesintheirbasicversionsasafunctionofframe

material.

Onmachinesweightingmorethan25kg,theactualweight

isstatedontheratingplate.

Installation

Cooling

Normalambienttemperaturesshouldnotexceed40°C

(marinestandard50°C)ifstandardperformanceistobe

achieve.Checkthatthemotorhassufficientairflow.

Ensurethatnonearbyequipmentorsurfacesradiate

additionalheattothemotor.Formoreinformationabout

higherambienttemperaturesandcooling,see“theMotor

Guide”orcontactABBSalesOffice.

Aluminium Cast iron Steel

Frame

size

Weight

Add.

for brake

Weight

63 6 - - -

71 8 5 13 -

80 12 8 20 -

90 17 10 30 -

100 25 16 40 -

112 36 20 50 -

132 63 30 90 -

160 110 55 175 -

180 160 65 250 -

200 220 - 310 -

225 295 - 400 -

250 370 - 550 -

280 - - 800 600

315 - - 1300 1000

355 - - 2300 2200

400 - - 3500 3000

Fläkt Woods 8265 GB 2011.10 3 Specifications are subject to alteration without notice

Installation and maintenance instruction

Fläkt Woods three phase asyncronous motor

Manufacturer: ABB

Foundation

Thepurchaserbearsfullresponsibilityforpreparationof

thefoundation.

Metalfoundationsshouldbepaintedtoavoidcorrosion.

Foundationsmustbeeven,andsufficientlyrigidtowith-

standpossibleshortcircuitforces.Theyshallbedimen-

sionedastoavoidtheoccurrenceofvibrationdueto

resonance.

Foundation studs

Boltthefoundationstudstothefeetofthemotorand

placea1-to-2mmshimbetweenthestudandthefeet.

Alignthemotordirectlyusingappropriatemeans.

Groutthestudswithconcrete,check,alignmentanddrill

holesforlocatingpins.

Drain holes

Alwayscheckthatopendrainholesfacedownward.

Machineswithclosableplasticdrainplugsaredelivered

withtheseopen.

Inextremelydustyenvironments,alldrainholesshould

beclosed.

Alignment

Correctalignmentisessentialtoavoidbearingfailures,

vibrationsandpossiblefracturedshaftextensions.

Slide rails and belt drives

• Fastenthemachinetothesliderailsasshowninfigure2.

• Placethesliderailshorizontallyonthesamelevel.

• Checkthatthemachineshaftisparallelwithdriven,

 ordriving,shaft.

• Anybeltmustbetensionedaccordingtothesupplier’s

 instructions.

Donotexceedthemaximumbeltforces(i.e.radialbearing

loading)statedintherelevantproductcatalogues.

Connection

Thenormalmachinedesigniswiththeterminalboxon

topandwithcableentrypossiblefrombothsides.

Somemachinesareavailable,asaspecialoption,withtop

mountedterminalboxesrotatable4x90°,andsomewith

sidemountedterminalboxes.

Availabilityofthesesolutionsisdescribedintheproduct

catalogues.

Unusedcableentriesmustbeclosed.

Aswellasmainwindingandearthingterminals,the

terminalboxcanalsocontainconnectionsforthermistors,

standstillheatingelements,bimetallic,switches,orPT

100resistanceelements.

WARNING!

 Excessivebelttensionwilldamage

 bearingsandcancauseshaftbreakage.

Connectiondiagramsforauxiliaryelementsarefound

insidetheterminalboxcover.

In frequency converter applications motorframe

externalearthingmustbeusedforequalisingthepoten-

tialbetweenthemotorframeandthedrivenmachine,

unlessthe two machinesaremounted onthe same

metallicbase.FormotorframesizesaboveIEC280,use

0.75x70mmflatconductororatleasttwo50mm²round

conductors.Thedistanceoftheroundconductorsmust

beatleast150mmfromeachother.

Thisarrangementhasnoelectricalsafetyfunction;the

purposeistoequalisethepotentials.Whenthemotor

andthegearboxaremountedonacommonsteelfunda-

ment,nopotentialequalisationisrequired.

TocomplywithEMC-requirements,onlycablesand

connectorsapprovedforthispurpose.(Seeinstruction

forfrequencyconverters.)

Assembly and dismantling

General

Dismantlingandassemblyofmachinesmustbecarried

outbyqualifiedpersonnelusingonlysuitabletoolsand

workingmethods.

Bearings

Specialcareshouldbetakenwiththebearings.

Thesemustberemovedusingpullersandfittedby

heatingorusingspecialtoolsforthepurpose.How

toreplacebearingsisdescribedindetailinaseparate

instructionleafletavailablefromABBSalesOffice.

WARNING!

 Voltagemaybeconnectedatstandstill

 insidetheterminalboxforheating 

 elementsordirectwindingheating.

WARNING!

 Thecapacitorinsingle-phasemotors 

 canretainachargethatappears 

 acrossthemotorterminals,evenwhen

 themotorhasreachedstandstill.

0.75 mm

70 mm

> 150 mm

min 50 mm

Cables/wire s

Plate/strip

3 ~ M

Driven machinery

Potential equalisation

Fläkt Woods 8265 GB 2011.10 4 Specifications are subject to alteration without notice

Installation and maintenance instruction

Fläkt Woods three phase asyncronous motor

Manufacturer: ABB

Fitting coupling halves and pulleys

Couplinghalvesandpulleysmustbefittedusingsuitable

equipmentandtoolsthatdonotdamagethebearings.

Neverfitacouplinghalforpulleybyhammeringinto

placeorremoveitusingaleverpressedagainstthebody

ofthemachine.

Mounting accuracy of coupling half :

checkthattheclearancebislessthan0,05mmandthatthe

differencea1toa2isalsolessthan0,05mm.Seefigure3.

Balancing

Therotorofthemachineisdynamicallybalanced.

Asstandard,balancinghasbeencarriedoutusinghalf

key,andtheshaftismarkedwith a RED tape,withthe

text“Balancedwithhalfkey”.

Toavoidvibrationthecoupling-halforpulleymustbe

balancedwithhalfkeyafterthekeywayhasbeen

machined.

Intheeventofbalancingwithfullkeytheshaftis

markedwith a YELLOW tape,withthetext“Balanced

withfullkey”.

Toavoidvibrationthecoupling-halforpulleymustbe

balancedwithoutakeyafterthekeywayhasbeen

machined.

Incasebalancingwithout key,theshaftismarkedwith

a BLUE tape,withthetext“Balancedwithoutkey”.

Maintenance and lubrication

General inspection

- Inspectthemachineatregularintervals.

- Keepthemachinecleanandensurefreeventilation

 airflow.

- Checktheconditionofshaftseals(egV-ring)and

 replaceifnecessary.

- Checktheconditionofconnectionsandmountingand

 assemblybolts.

- Checkthebearingconditionbylisteningforunusual

 noise,vibrationmeasurement,bearingtemperature,

 inspectionofspentgreaseorSPMbearingmonitoring.

*Whenchangesofconditionoccur,dismantlethemachine,

checkthepartsandreplaceifnecessary.

Lubrication

Machines with permanently greased bearings

Machinesuptoframesize180arenormallyfittedwith

permanentlygreasedbearingsofeitherZor2Ztypes.

Bearingtypesarespecifiedintherespectiveproductcata-

loguesandontheratingplateofeachmotorfromsize112

andlarger.

WARNING!

 Bewareofallrotatingparts!

Asaquide,adequatelubricationcanbeachievedforthe

followingduration,accordingtoL1atambienttempera-

tureof25°C.

32000-45000dutyhoursfor4polemachines.1)

16000-26000dutyhoursfor2and2/4pole

machines.

Theshortertimesapplytolargerframesizes.

 Dependingonapplicationandloadconditions,see

 applicableproductcatalogue.

 Hoursofoperationforverticalmotorsarehalfofthe

 abovevalues.

Machines with relubrication system

Relubricationprocedure:

- Removegreaseoutletplugiffitted.

- Pressfreshgreaseintothebearinguntilalloldgrease

 hasbeenforcedout

- Letthemotorrun1-2hourstoensurethatallexcess

 greaseisforcedoutofthebearing.Closethegrease

 outletplugiffitted.

Regreasemotorswhilerunning.Ifthisisnotpossible,

lubricationcanbecarriedoutwhilethemachineisata

standstill.Inthiscase,useonlyhalfthequantityofgrease,

thenrunthemotorforafewminutesatfullspeed.When

themotorhasstopped,theremainingquantityofgrease

canbeforcedinuntiltheoldgreasehasbeenreplaced.

After1-2runninghoursclosethegreaseoutletplug(if

fitted).

Thegreaseoutletplugmustberemovedpermanently

withautomaticlubrication.

Ifthemachineisfittedwithalubricationinformation

plate,followthevaluesgiven,otherwiseusethevalues

intable,page5.

ABBMotorspolicyistohavereliabilityasavitalissuein

bearinglubricationintervals.Thatiswhywefollowthe

L1-principle(meaningthat99%ofthemotorsaresure

tomaketheintervaltime).AccordingtoL1policythe

lubricationintervalsareasfollows:

Fläkt Woods 8265 GB 2011.10 5 Specifications are subject to alteration without notice

Installation and maintenance instruction

Fläkt Woods three phase asyncronous motor

Manufacturer: ABB

Lubricationintervalsforverticalmachinesarehalfofthe

abovevalues.

Theamountofgreasestatedinthetableshouldbedoub-

ledifanautomaticregreasingsystemisused.

Thetablevaluesarebasedonthemotorrunningatrated

outputinanambienttemperatureofabout+25°C(approx.

80°Cbearingtemperature).Thevaluesshouldbehalved

for15°Cincreaseinbearingtemperatureandmaybe

doubledfor15°Cdecreaseinambienttemperature.

Higherspeedoperation,eginfrequencyconverterapplica-

tions,orlowerspeedwithheavyloadwillrequireshorter

lubricationintervals.ConsultABBSalesOfficeinsuchcases.

Typicallyadoublingofspeedwillrequireareductionof

lubricationintervalstoapprox.40%ofvaluestabulated

above.

Suitabilityofbearingsforhighspeedoperationmustalsobe

checked.

WARNING!

 Themaximumoperatingtemperature

 ofthegreaseandbearingsmustnotbe

 exceeded.

Lubricants

Whenregreasing,useonlyspecialballbearinggrease

withthefollowingproperties:

- goodqualitygreasewithlithiumcomplexsoapand

 withmineral-orPAO-oil

- baseoilviscosity100-150cSTat40°C

- consistencyNLGIgrade2or3

- temperaturerange-30°C-+120°C,continuously.

Greasewiththecorrectpropertiesisavailablefromall

themajorlubricantmanufacturers.

Thefollowing(orsimilar)highperformancegreasecan

beused

• EssoUnirex N2orN3

• Shell AlbidaEMS2

• SKF  LGHQ3

• Mobil MobilithSHC100

• Klüber KluberplexBEM41-132

• BP  EnergreaseLC2

 NOTE!

 Alwaysusehighspeedgreaseforhighspeed

 machinensandsomeothermodels,e.g.M2_355

 and4002-polemachines,wherethespeedfactoris

 higherthan400000(calculatedasDmxnwhere

 Dm=averagebearingdiameter,mm;n=rotational

 speed,rpm).Thefollowing,orsimilar,typesof

 greasecanbeused:

• Kluber AsonicGHY72

• Kluber AsonicHQ72-102

• Shell AlbidaEMS2

• Esso  LT2

• Mobil MobilithSHC100

Thefollowingnormaltypeofgreasecanbeusedifthe

regreasingintervalishalved(thesetypesofgreaseshould

notbeusedwhenbearingtemperatureisabove100°C).

• Esso  Beacon2or3

• Shell AlvaniaRL2orRL3

• SKF  LGMT2or3

• Mobil Mobilux2

• Kluber Centoplex2

• BP  EnergreaseLS2

Ifthemakeofgreaseischangedandcompatibilityis

uncertain,consultABBSalesOffice.

Highlyloadedand/orslowlyrotatingbearingsrequire

EPgrease.

Iftheambienttemperatureisbelow-25°Corabove

+55°C,orbearingtemperatureisabove110°C,consult

ABBSalesOfficeregardingsuitablegrease.

Frame

size

Amount

of grease

g/bearing

3600

r/min

3000

r/min

1800

r/min

1500

r/min

1000

r/min

500-900

r/min

Ball bearings

Lubrication intervals in duty hours

112 10 10000 13000 18000 21000 25000 28000

132 15 9000 11000 17000 19000 23000 26500

160 25 7000 9500 14000 17000 21000 24000

180 30 6000 8000 13500 16000 20000 23000

200 40 4000 6000 11000 13000 17000 21000

225 50 3000 5000 10000 12500 16500 20000

250 60 2500 4000 9000 11500 15000 18000

280 70 2000 3500 8000 10500 14000 17000

315 90 2000 3500 6500 8500 12500 16000

355 120 1200 2000 4200 6000 10000 13000

400 120 1200 2000 4200 6000 10000 13000

Roller bearings

Lubrication intervals in duty hours

160 25 3500 4500 7000 8500 10500 12000

180 30 3000 4000 7000 8000 10000 11500

200 40 2000 3000 5500 6500 8500 10500

225 50 1500 2500 5000 6000 8000 10000

250 60 1300 2000 4500 5700 7500 9000

280 70 1000 1700 4000 5300 7000 8500

315 90 1000 1700 3300 4300 6000 8000

355 120 400 1000 2000 3000 5000 6500

400 120 400 1000 2000 3000 5000 6500

WARNING!

 Greasecancauseskinirritationandeye

 inflammation.Followallsafetyprecau-

 tionsspecifiedbythemanufacturer.

Fläkt Woods 8265 GB 2011.10 6 Specifications are subject to alteration without notice

Installation and maintenance instruction

Fläkt Woods three phase asyncronous motor

Manufacturer: ABB

Spare parts

Whenorderingspareparts,thefulltypedesignationand

productcode,asstatedontheratingplate,mustbe

specified.

Ifthemachineisstampedwithaserialmanufacturing

number,thisshouldalsobegiven.

Environmental requirements

Noise levels

Smallermachineshaveasoundpressurelevelthatnot

exceeding70dB(A).

Thefollowingtableshowscataloguevaluesofsound

pressurelevelsat1mfromthemachinesurface.

Valuesforspecificmachinescanbefoundintherelevant

productcatalogues.Toleranceacc±3dB(A).

Thetablevaluesreferto50Hzsinusoidalsupply

conditions.

For60Hzsinusoidalsupply,add4dB(A)totheabove

values.

Forsoundpressurelevelswithnon-sinusoidalsupplies,

contactABBSalesOffice.

Soundpressurelevelsforallmachinesintheabove

framesizeshavingseparatecoolingsystemsandfor

seriesM2F*/M3F*,M2L*/M3L*,andM2R*/M3R*,are

indicatedinseparatespecificMachineInstructions.

Rewinding

Rewindingshouldalwaysbecarriedoutbyqualified

repairshops.

Smokeventingandotherspecialmotorsshouldnotbe

rewoundwithoutfirstcontactingABBMotors.

Guideline sound pressure level, dB(A)

Frame size 2 pole 4 pole 6 pole 8 pole

132 69 59 61 56

160 69 62 59 59

180 69 62 59 59

200 72 63 63 60

225 74 66 63 63

250 75 67 63 63

280 77 68 66 65

315 80 71 68 72

355 83 80 75 75

400 83 80 - -

Fläkt Woods 8265 GB 2011.10 7 Specifications are subject to alteration without notice

Installation and maintenance instruction

Fläkt Woods three phase asyncronous motor

Manufacturer: ABB

Theseinstructionsdonotcoveralldetailsorvariationsin

equipmentnorprovideforeverypossibleconditiontobe

metinconnectionwithinstallation,operationormain-

tenance.Shouldadditionalinformationrequired,please

contactthenearestABBSalesOffice.

Motor trouble shooting chart

Yourmotorserviceandanytroubleshootingmustbe

handledbyqualifiedpersonswithpropertoolsand

equipment.

TROUBLE CAUSE WHAT TO DO

Motor fails to start Blown fuses Replace fuses with proper type and rating.

Overload trips Check and reset overload in starter.

Improper power supply Check to see that power supplied agrees with motor

name plate and load factor.

Improper line connections Check connections with diagram supplied with motor.

Open circuit in winding or control switch Indicated by humming sound when switch is closed. Check for loose

wiring connection. Also, ensure that all control contacts are closing.

Mechanical failure Check to see if motor and drive turn freely. Check bearings and lubrication.

Short circuited stator Indicated by blown fuses. Motor must be rewound.

Poor stator coil connection Remove end bells, locate with test lamp.

Rotor defective Look for broken bars or end rings.

Motor may be overloaded Reduce load.

Motor stalls One phase may be open Check lines for open phase.

Wrong application Change type or size. Consult manufacturer.

Overload Reduce load.

Low voltage Ensure the name plate voltage is maintained. Check connection.

Open circuit Fuses blown, check overload relay, stator and push buttons.

Motor runs and then

dies down

Power failure Check for loose connections to line, fuses and control.

Motor does not

come up to speed

Not applied properly Consult supplier for proper type.

Voltage too low at motor terminals

because of line drop

Use higher voltage or transformer terminals or reduce load.

Check connections. Check conductors for proper size.

Starting load too high Check load motor is supposes to carry at start.

Broken rotor bars or loose rotor Look for cracks near the rings. A new rotor may be

required, as repairs are usually temporary.

Open primary circuit Locate fault with testing device and repair.

Motor takes too long to

accelerate and/or draws

high amp

Excessive load Reduce load.

Low voltage during start Check for high resistance. Adequate wire size.

Defective squirrel cage rotor Replace with new rotor.

Applied voltage too low Get power company to increase power tap.

Wrong rotation Wrong sequence of phases Reverse connections at motor or at switchboard.

Motor overheats while

running underloaded

Overload Reduce load.

Frame or bracket vents may be clogged

with dirt and prevent proper ventilation

of motor

Open vent holes and check for a continuous stream of air from the motor.

Motor may have one phase open Check to make sure that all leads are well connected.

Grounded coil Locate and repair.

Unbalanced terminal voltage Check for faulty leads, connections and transformers.

Fläkt Woods 8265 GB 2011.10 8 Specifications are subject to alteration without notice

Installation and maintenance instruction

Fläkt Woods three phase asyncronous motor

Manufacturer: ABB

TROUBLE CAUSE WHAT TO DO

Motor vibrates Motor misaligned Realign.

Weak support Strengthen base.

Coupling out of balance Balance coupling.

Driven equipment unbalanced Rebalance driven equipment.

Defective bearings Replace bearings.

Bearings not in line Line up properly.

Balancing weights shifted Rebalance motor.

Contradiction between balancing of rotor

and coupling

(half key – full key)

Rebalance coupling or motor

Polyphase motor running single phase Check for open circuit.

Excessive end play Adjust bearing or add shim.

Scraping noise Fan rubbing air shield Remove interference.

Fan striking insulation Clear fan.

Loose on bedplate Tighten holding bolts.

Noisy operation Airgap not uniform Check and correct bracket ﬁts or bearing.

Rotor unbalance Rebalance.

Hot bearings general Bent or sprung shaft Straighten or replace shaft.

Excessive belt pull Decrease belt tension.

Pulleys too far away Move pulley closer to motor bearing.

Pulley diameter too small Use larger pulleys.

Misalignment Correct by realignment of drive.

Hot bearings ball Insufﬁcient grease Maintain proper quality of grease in bearing.

Deterioration of grease or lubricant

contaminated

Remove old grease, wash bearings thoroughly

in kerosene and replace with new grease.

Excess lubricant Reduce quantity of grease, bearing should not be more than 1/2 ﬁlled.

Overloaded bearing Check alignment, side and end thrust.

Broken ball or rough races Replace bearing, ﬁrst clean housing thoroughly.

ABB MT series Installation And Maintenance Instruction

ABB MT series Installation And Maintenance Instruction

ABB MT series Installation And Maintenance Instruction

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