Danfoss TTS400 - Page 255

Figure 5-1 Fault Trigger Methods
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Fault Reset:Afaultthatdoesnotrequireapowercycletoclear(non-critical)canberesetinthefollowingmanner:
Interlockmustbeclosed,settheDemandto"0"andafterwardstoavaluegreaterthan0.Nowthefaultisresetand
thecompressorisreadytorun.Theassumptionisthatthecauseofthefaulthasbeenrectified.
TheClearFaultsbuttonintheSMTCompressorMonitorcanbeusedinsoftwareversions4.0.0andlater.Alsoseethe
OEMProgrammingGuideforadditionalfaultresetoptions.
Afaultdemandingapowercycle(Lock-OutFault)isresettablebycyclingthemainspowertothecompressor.The
assumptionisthatthecauseofthefaulthasbeenrectified.Refertothefollowingtables:
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Table5-6CompressorStatus
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Table5-8Motor/SystemStatusonpage260
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Table5-9BearingStatusonpage263
Table 5-6 Compressor Status
Compressor Status
Description
Trigger Method Troubleshooting
HighInverter
TemperatureFault
AFT Consequence:
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IndicatestheInvertercoolingisinsufficient.Repeatedoccurrencesofthisalarmcan
resultinInverterfailure.
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Ifthisfaultoccursthree(3)timeswithina30-minuteperiod,aLock-OutFaultwilloccur.
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ThemeasuredInvertertemperaturemustdropbelowtheMaximumDriveStartup
Temperaturebeforearestartcanbeattempted,otherwisetheCompressorMonitorTool
ControlStatusmessage“Abovedrivetemperaturelimitwaitingtocooldown”willbe
displayed.
Recommendation:
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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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o
LowLiftoperationrequiresadditionalconsiderations,refertotheApplications
Manual
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Verifythesolenoidsareoperationalandnotblocked.RefertoSection4.6.3Solenoid
M-SV-001-EN Rev. H-1/23/2023 Page 255 of 294