Danfoss TTS700

5.2.2 Motor/System Faults Troubleshooting
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Table 5-8 Motor/System Status
Motor/System
Status Description
Trigger
Method
Troubleshooting
MotorSingle
Phase
Overcurrent
Fault
AFT
l
One(1)phaseoftheInvertertomotorisgeneratinghighcurrent.
l
ReviewFaultandEventLogdetailstodetermineconditionsrelatedtothefault.Thisfaultcanbea
resultofliquidcarryover,alossofshaftmagneticstrength,seeBackEMFisLowfault,orInverter
failure.RefertoInverterError.
l
VerifytheStator.RefertoSection4.23.4MotorVerificationonpage195.
l
VerifytheInverterandtheInvertercableconnections.RefertoSection4.22.2InverterVerificationon
page176.
l
ThisfaultcanberelatedtoBMCCInverterswitchingcontrol.VerifytheBMCC.RefertoSection4.27.2
BMCCVerificationonpage220.Iffault/eventlogsshowoccurrenceofSinglePhaseOver-Current
faultafteroneInverterError,theInvertershouldbeverifiedandmayrequirereplacement.
DCBus
Overvoltage
Fault
AFT
l
SuggeststhattheDCbusvoltageisabovetheMaximumDCBusVoltage.
l
MeasuretheincomingmainACvoltage.
l
MeasuretheDCbusvoltageusingtheDCBusTestHarness.RefertoSection4.21.2DCBusVoltage
Verificationonpage167.
l
ComparethemeasuredvoltagestothedisplayedreadingsintheCompressorMonitorTooland
detailsintheFaultandEventLogtodetermineconditionsrelatedtothefault.
l
CorrecttheincomingmainACvoltageifitishigherthanthemaximumrecommendedvalueforthe
application.
l
IfthemeasuredDCbusvoltageexceedstheMaximumDCBusVoltageandincomingmainAC
voltageiscorrect,verifytheSoftStart.RefertoSection4.14.2SoftStartVerificationonpage115.
l
All3-phasevoltageinformationdisplayedintheSMTiscalculatedfromDCbusvoltage,asmeasured
bytheInverter,verifytheInverteranditsconnections.RefertoSection4.22.2InverterVerificationon
page176.
Motor
Overcurrent
Fault
AFT
l
SuggestsACinputvoltageistooloworthecompressorisoverloaded.
l
Ifthisfaultoccursthreetimeswithina30-minuteperiod,aLock-OutFaultwilloccur.
l
Verifythe3-phaseACinputvoltageisabovetheminimumrecommendedvaluefortheapplication.
l
Heavy,saturatedgascancausethemotortooverworkandgeneratehighcurrent.Ensure
superheatedgasisenteringthecompressorsuctionport.
l
VerifytheInverter.RefertoSection4.22.2InverterVerificationonpage176.
l
VerifytheStator.RefertoSection4.23.4MotorVerificationonpage195.
InverterError INS
l
IndicatesthereisanerrorwithintheInverterControlBoardornoBMCCcommunicationwiththe
Inverter.
l
Pre-CC4.0.0-Ifthisfaultoccursthree(3)timeswithina30-minuteperiod,aLock-OutFaultwill
occur.
l
CC4.X.X-InstantaneousLockoutFault
l
VerifytheInverterandtheInvertercableconnections.RefertoSection4.22.2InverterVerificationon
page176.IftheInverterErrorfaultpersistsaftertheInverterisverified,itshouldbereplaced.
l
ReviewtheFaultandEventLogforrecordedoccurrencesofthisfault.AnyoccurrenceofSingle
PhaseOvercurrent,BackEMFisLoworRotorMayBeLockedfaultsimmediatelyfollowinganInverter
ErrorfaultmostlikelyindicatesafaultyInverter.
BearingAlarm
Active
INS
l
Ifabearingfaulttypeispresent,theBearingAlarmistriggeredintheMotor/Statussection.
l
Thisisnotanactualfault,onlyanindicationthatafaulthasoccurredintheBearingsection.Referto
Section5.1.2FaultTypesonpage251.
Page 260 of 294 - M-SV-001-EN Rev. H 1/23/2023