WEG CFW900 - 6.6 PREVENTIVE MAINTENANCE

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TROUBLESHOOTINGANDMAINTENANCE
6.6PREVENTIVEMAINTENANCE
!
DANGER!
Alwaysturnoffthemainspowersupplybeforetouchinganyelectricalcomponentassociatedtothe
inverter.
Highvoltagemaystillbepresentevenafterdisconnectingthepowersupply.Therefore,waitatleast
10minutesforthecompletedischargeofthepowercapacitors.
Alwaysconnecttheequipmentframetotheprotectionearth(PE)atthesuitableconnectionpoint.
!
WARNING!
Theelectronicboardshaveelectrostaticdischargesensitivecomponents.Do nottouchthe
componentsorconnectorsdirectly.Ifneeded,firsttouchthegroundedmettalicframeorweara
groundstrap.
Donotperformanywithstandvoltagetest:ifneeded,consultWEG.
Theinvertersrequirelowmaintenancewhenproperlyinstalledandoperated.Table6.3presentsmainprocedures
andtimeintervalsforpreventivemaintenance.
Table6.4providesrecommendedperiodicinspectionstobe
performedevery6monthsafterinverterstart-up.
Table6.3:Preventivemaintenance
MaintenanceIntervalInstructions
FanreplacementAfter50.000operatinghours
(1)
ReplacementprocedureaccordingtoFigure6.1
andFigure6.2.
ReplacementoftheAUIboardbatteryEvery10yearsRefertoChapter3
Electrolytic
Capacitors
If theinverter isstored
(notinuse)::“reforming”
Everyyear,countedfromthe
manufacturingdatestatedontheinverter
identificationlabel.
Section2.3.1)
Powerinverterwithsingle-phaseorthree-phase
voltagebetween208and240Vac,50or60Hz,
foratleast1hour.Then,de-energizeandwaitat
least24hoursbeforeusingtheinverter(energize
again)
Inverterisbeingused:Every10yearsContactWEGtechnicalsupport
replace
(1)
Theinvertersareprogrammedatthefactoryforautomaticcontrolofthefans(C1.5.1=3),sotheyonlystartwhenthetemperatureofthe
heatsinkincreases. Therefore,thenumberofoperatinghoursofthefanswilldependontheoperatingconditions(motorcurrent,output
frequency,temperatureofthecoolingairetc.).TheinverterrecordsinparameterD3.3thenumberofhoursthatthefanremainedON.When
thefanreaches50,000hoursofoperation,theHMIwilldisplayalarmA177.
Table6.4:Recommendedperiodicinspections-every6months
ComponentProblemCorrectiveAction
Terminals,connectorsLoosescrewsTighten
Looseconnectors
Fans/coolingsystem
DirtyfansCleaning
AbnormalnoiseReplacefan.RefertoFigure6.1andFigure6.2.
Blockedfan
Proceedinreverseordertoassembleanewfan
AbnormalvibrationCheckthefanconnection
Dustinthecabinetairfilter
Printedcircuitboards
Accumulationofdust,oil,humidity,etcCleaning
OdorReplacement
Powermodule/power
connections
Accumulationofdust,oil,humidity,etcCleaning
LooseconnectionscrewsTighten
DCLinkcapacitors(Intermediate
Circuit)
Discoloration/odor/electrolyteleakageReplacement
Expandedorbrokensafetyvalve
Frameexpansion
PowerresistorsDiscolorationReplacement
Odor
HeatsinkDustaccumulationCleaning
Dirty
90|CFW900