Danfoss TTS400

Compressor Status
Description
Trigger Method Troubleshooting
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Ensuretheliquidmotor-coolinglinehassufficientliquidsupplyandisnotblocked.
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Preventprolongedoperationatapressureratiolessthan1.5.
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Verifythesolenoidsareoperationalandnotblocked.RefertoSection4.6.3Solenoid
Verificationonpage73.
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Verifythesolenoidactuators.RefertoSection4.6.3SolenoidVerificationonpage73.
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VerifytheSerialDriver.RefertoSection4.26.3SerialDriverVerificationonpage217.
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VerifySCRtemperaturesensor.RefertoSection4.18.2.5SCRTemperatureSensor
Verificationonpage144.
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VerifySCRs.RefertoSection4.18.2SCRVerificationonpage142.
(AlarmandFaultremovedfromCC4.2.Xandlatersoftware)
LockOutFault INS InstantaneousLockOutFault:
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DischargePressurePre-CC4.0.0
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3-PhaseOvercurrentPre-CC4.0.0
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InverterErrorCC4.X.X
Ifany(oracombinationof)thefaultslistedbelowoccursmorethanthree(3)timeswithin30minutes,
aLock-Outfaultwilloccur:
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DischargePressureCC4.X.X
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InverterTemperature
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SCRTemperature
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3-PhaseOvercurrentCC4.X.X
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MotorHighCurrent
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InverterErrorPre-CC4.0.0
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RotorStartingTorque
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LowMotorBackEMF
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Reviewfaultlogforindicationoffaultsrecordedattimeoflockoutfault.Determine
causeofthefaultsandrepairasnecessary.
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CyclepowertoclearLock-OutFault.Activealarm/FaultViewerinSMTallowstheLock
Outcountertobemonitored.
HighWinding
TemperatureFault
AFT
l
IndicatestheRawMotorThermalReadoutintheCompressorMonitorToolhasexceeded
themaximumlimit.
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Ensuretheliquidmotor-coolinglinehassufficientliquidsupplyandisnotblocked.
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Preventprolongedoperationatapressureratiolessthan1.5.
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Verifythesolenoidsareoperationalandnotblocked.RefertoSection4.6Solenoidsand
Coilsonpage72.
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Verifythesolenoidactuators.RefertoSection4.6.3SolenoidVerificationonpage73.
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VerifytheSerialDriver.RefertoSection4.26.3SerialDriverVerificationonpage217.
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Verifythemotorthermistor.RefertoSection4.23.4.3StatorThermistorResistance
Verificationonpage195.
HighSuction
SuperheatFault
AFT
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SuctionSuperheatiscalculatedfromthecompressorsuctionpressureandtemperature
values.
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Suggestshighevaporatortemperaturecombinedwithlowevaporatorpressure,
insufficientrefrigerantcharge,checkvalvehasfailedtoopenorthecompressorhas
beenrunninginsurgeconditionforanextendedperiodoftime.
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Checkthecharge,systemloadandenteringair/waterconditions.
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Verifycheckvalveopensduringcompressoroperation.
Page 258 of 294 - M-SV-001-EN Rev. H 1/23/2023