EngA AF Series

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AF / DCU MANUAL
IOM-52 20 of 23 Apr 13 R2
ELECTRICAL
 Checkallwiringforlooseconnections.
 Checkvoltageatunit(whileinoperation).
 Checkamperagedrawagainstunitratingplate.
 Wherepossible,allcontactorsshouldbeinspectedtoensurethatcontactsarecleanandare
makinggoodcontact.Ifcontactsareabnormallypittedorburnedbadly,replacecontactor.Single
phasingandmotorburnoutscanresultfrombadcontacts.
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BELTADJUSTMENT
Formaximumbeltandbearinglife,pulleyalignmentandbelttensionmustbeproperlymaintained.Only
replacewithbeltsofthepropertypeandsize.
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NOTE:Ifbeltsaretootightorimproperlyaligned,thelifeexpectancyofthemotor(s),fanbearingsand
belt(s)arereduced.
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Alignment: Pulleysmustbealignedtowithin1/16”perfoot(1mmper760mm)ofspan.
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BeltDeflection: Allow1/64”(0.4mm)ofdeflectionforeach1”(25.4mm)ofspanlength.
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CAUTION:
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Excessivebelttensionisthemostfrequentcauseofbeltwear,bearingwearandnoise.
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SETSCREWS
Checksetscrewsonfanwheel,fanbearings,fanandmotorpulleysforloosenessontheshaft.Tighten
whererequired.Itisimportanttoperformthischeckbeforeinitialstart‐up,afterarun‐inperiodof2
weeksandthenon4monthintervals.
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CAUTION:
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Overtighteningsetscrewscandamagebearings.
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DEFLECTION
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