Danfoss Turbocor TT Series

Chapter 5.0 lTroubleshooting
5.1 Alarm and Fault Indications
Thefirststepintroubleshootingistogatherasmanyfactsaspossible.Compressorfaultandeventlogsprovide
factualhistoricalinformationthatwillindicatetheexactreasonthatthecompressorshutdown,thefrequencyof
faultsandcompressorstarts,aswellasthevalueofpertinentparametersatthetimeofthefault.Theselogsshould
bereviewedindetailtogaininformationtoallowefficienttroubleshootingforanyfault.
5.1.1 Alarm Types
Alarmsindicatecompressoroperatingconditionsarebeyondsetlimitsofthenormaloperatingenvelopeorset
alarmlimits.Compressoralarmswillallowthecompressortorun,butspeedistypicallyreducedtobringthe
conditionunderthealarmlimit.RefertoTable5-1AlarmTypes.
Table 5-1 Alarm Types
Compressor Status Alarm Description
3-PhaseOver-Current Thecalculated3phasecurrenthasexceededthealarmlimit.
CavityTemperature Themeasuredcavitytemperaturehasexceededthealarmlimit.
DischargePressure Themeasureddischargepressurehasexceededthealarmlimit.
DischargeTemperature Themeasureddischargetemperaturehasexceededthealarmlimit.
(RemovedfromCC4.X.Xsoftware)
InverterCoolingControl TheMeasuredInverterTemperaturehasexceededtheInverterCoolingControlFaultlimit,startingtheFaultDelaytimer.
InverterTemperature ThemeasuredInvertertemperaturehasexceededthealarmlimit.
LeavingFluid
Temperature
Thelowestacceptablemeasuredleavingfluidtemperaturehasexceededthealarmlimit.
(RemovedfromCC4.X.Xsoftware)
MotorCoolingControl TheMeasuredCavityTemperaturehasexceededtheMotorCoolingControlFaultlimit,startingtheFaultDelaytimer.
PressureRatio Thecalculatedpressureratioofdischarge/suctionhasexceededthealarmlimit.
SCRTemperature ThemeasuredSCRtemperaturehasexceededthealarmlimit.
(SensorremovedfromRev.Hcompressors)(FaultandAlarmremovedfromCC4.2.Xandlatersoftware)
SuctionPressure Themeasuredsuctionpressurehasexceededthealarmlimit.
Superheat Thecalculatedsuperheattemperaturehasexceededthealarmlimit.Thesuperheatalarmisset8°Kbelowthefaultlimit.
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5.1.2 Fault Types
Criticalandnon-criticalfaultsindicatecompressoroperatingconditionsarebeyondsetlimitsofthenormal
operatingenvelopeorsetfaultlimits.Exceedingfaultlimitswillstopthecompressorin10secondsorless.Referto
thefollowingtables:
l
Table5-2CompressorFaultTypesonpage252
l
Table5-3CompressorStatus2Faultsonpage253
l
Table5-4MotorFaultTypesonpage253
l
Table5-5BearingFaultTypesonpage254
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