WEG CFW900 - 6.4 SOLUTIONS FOR THE MOST FREQUENT PROBLEMS; 6.5 INFORMATION FOR CONTACTING TECHNICAL SUPPORT

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TROUBLESHOOTINGANDMAINTENANCE
6.4SOLUTIONSFORTHEMOSTFREQUENTPROBLEMS
Table6.2:Solutionsforthemostfrequentproblems
ProblemPointtobeverifiedCorrectiveAction
MotordoesnotstartIncorrectwiring
connection
1.Checkallpowerandcontrolconnections.Forinstance,thedigitalinputsset
toStart/Stop,GeneralEnable,ornoexternalerrorshallbeactivated
Analogreference(ifused)1.Checkiftheexternalsignalisproperlyconnected
2.Checkthestatusofthecontrolpotentiometer(ifused)
Incorrectsettings1.Checkifparametersareproperlysetfortheapplication
Fault1.Checkiftheinverterisnotblockedduetoafaultcondition
2.Checkifthereisashortcircuitbetweentheterminalsofthe24Vdcpower
supply
Motorstall1.Decreasemotoroverload
IncreaseC3.2.1.1(V/F)or
C3.3.5.1.2,C3.3.5.1.3,C3.3.5.1.4andC3.3.5.1.5(vectorcontrol)
Motorspeedfluctuates
(oscillates)
Looseconnection1.Stoptheinverter,turnoffthepowersupply,andcheckandtightenallpower
connections
2.Checkallinternalconnectionsoftheinverter
Defectivereference
potentiometer
1.Replacepotentiometer
Oscillationoftheexternal
analogreference
1.Identifythecauseoftheoscillation.Ifitiscausedbyelectricalnoise,use
shieldedcablesorseparatefromthepowerandcontrolwiring
Incorrectsettings(vector
control)
1.CheckparametersC2.2.2andC2.2.4
2.Refertotheprogrammingmanual
Motorspeedtoohighor
toolow
Incorrectsettings
(referencelimits)
1.CheckifthecontentofC4.3.1.1.1(minimumspeed)andC4.3.1.1.2(maximum
speed)areaccordingtothemotorandapplication
Control signalfrom the
analogreference(ifused)
1.Checkthelevelofthereferencecontrolsignal
2.Checktheprogramminggainsandoffset
Motornameplate1.Checkifthemotorhasbeenproperlysizedfortheapplication
Motordoesnotoperate
inthefieldweakening
region(VectorControl)
Settings1.CheckC2.2.2e C3.3.7.1
OffdisplayKeypadconnections1.Checktheinverterkeypadconnection
Powersupplyvoltage1.Ratedvaluesshallbewithinthelimitsspecifiedbelow:
200-240Vcapowersupply:-Min:187Vca
-Max:253Vca
380-480Vcapowersupply:-Min:323Vca
-Max:528Vca
Blownfuses1.Replacefuses
Lowmotorspeedand
S1.1.4=C3.3.5.1.2
ouC3.3.5.1.3
ouC3.3.5.1.4ou
C3.3.5.1.5(motorin
torquelimitation),for
C3.1.1=2(vectorwith
encoder)
Encodersignalsare
invertedorpower
connectionisinverted
1.CheckifthesignalsA,
¯
A ,B,
¯
B arecorrectlyconnectedtotheCFW900-
IOS
(item3.2.6)ortotheaccessoryofinputsforincrementalencoder(seethe
CFW900-ENC-01manual).Ifsignalsareproperlyinstalled,exchangetwoofthe
outputphases.ForinstanceUandV.
6.5INFORMATIONFORCONTACTINGTECHNICALSUPPORT
Fortechnicalsupportandservicing,itisimportanttohavethefollowinginformationinhand:
Invertermodel.
Productserialnumberandmanufacturingdatecontainedintheidentificationlabel(seeSection2.3.1).
Installedsoftwareversion(seeparameterS1.2.1).
Applicationdataandinvertersettings.
CFW900|89