- 10-
MaintenanceBy‐pass:
□CloseMoldcastcircuitbreaker“O ff”ofeveryload.
□Pushingthegreenbutton“Off”onfrontpanel,althoughthereisnooutputvoltage,theAVRis
stillinaction.
□SwitchMCCB(1)Moldcastcircuitbreakerto“Off”position.
□SwitchMCCB(2)Moldcastcircuitbreakerupto“On”position.
□UsingTureRMSvoltagemetertomeasuretheO/PN,UVWontheterminalboard,iftheoutput
voltageiscorrect,AVRisby‐passsuccessfully.
9‐Maintenance&Cleaning
DothecleaningduringtheinputMoldcastcircuitbreakerMCCB(1)andmaintenance
by‐passMCCB(2)switchisin“Off”positionforhumanhealth.
Donotusedetergentsoranycleaningmaterialthatmaydamagethecabinetsurfaces.
DonotletanyliquidgetintotheAVR.
Ensurethattheairholesareopen.
TheAVRbodycanbewipedwithacleananddrycloth.
ChecktheareasurroundingtheAVR.Ensuretheareaisnotcluttered,allowingfree
accesstotheunit.
Ensuretheairintakes(ventsonthefrontdoors)andexhaustopening(onrearoftheAVR
cabinetsections)arenotblocked.
Toensuremaximumlifeoftheequipment,thefollowingshouldbepartofanannualmaintenance
program.WarningDe‐energizeunitbef or eperformingmaintenance.Voltagesarepresentinsidethisunit
whichcancauseinjury.Therefore,onlypersonnelqualifiedtoserviceelectricalequipmentshould
performmaintenanceonthisunit.
‐Vacuum the voltageregulatorinsideandouttoremoveaccumulateddirt,whichcouldleadto
overheatingorinsulationfailure.
‐Tightenallelectricalconnections,particularlyallpowerwiringto ,andin,theunit.
‐Inspectallvariabletransformerbrushesandcommutatorsforsignsofwearorpitting.Replaceas
required.Donotat tempttocleanacommutatorwithanabrasivesuchassandpaperorafile.Thiswill
ruinthesoftpreciousmetalplatingonthecommutatorandwillshortenthelifeoftheunit.Itis
normalforcommutatorstobecomeblackduetocarbonbrushtracking.Ifacommutatoristobe
cleaned,usedenaturedalcoholandasoftcloth.