Danfoss TTS400

Chapter 6.0 Maintenance
6.1 Preventative Maintenance Tasks
Table6-1PreventativeMaintenanceTasksidentifiestasksthatshouldbeperformedonaregularbasistomaintain
optimalperformanceofthesystem.
Table 6-1 Preventative Maintenance Tasks
Item Task
Frequency
6 Months 12 Months Other
General
Inspections
Checkphysicalconditionofcompressor.
P
 
 Checkforexcessivevibrationfromotherrotatingequipment.
P
 
 Checkforoilinthesystem.Thecompressormustoperateinan
oil-freeenvironment.Ensurealloilisremovedfromthesystem.

P

Compressor
Inspections
ConnecttothecompressorusingtheServiceMonitoringTools
softwareanddownloadfaultandeventlogs.Reviewandsave
logsforfuturereference.
P
 
 ConnecttothecompressorusingtheServiceMonitoringTools
softwareandperformacalibration.Donotsavethecalibrationto
EEPROMifthecompressorhasbeenoperatingcorrectly.Create
andsaveaCalibrationReportforfuturereference.

P

 InspecttheCapacitorReliefMembrane.Replaceasnecessary.
P


Electrical
Inspections
Checkmainpowersupplyvoltages.
P
 
 Ensureelectricalterminalsaretight. 
P

 Checkforsignsofhotspots/discolorationonpowercables.
P
 
 Checkamperagesduringoperationareasperdesign.
P
 
 CheckDCbusvoltage. 
P

 ReplaceDCCapacitorBusBarAssembly.(RefertoSection4.21DC
CapacitorBusBarAssemblyonpage165)
  Energized:10
years/Denergized:5
years
 Checkoperationofallsystemsafetydevicesandinterlocks. 
P

 Performmoisture-preventionmeasures. 
P

 ReplaceSoftStartfan.(RefertoSection4.14.8SoftStartFan
RemovalandInstallationonpage123)


5years,referto
CustomerNotification
B-CN-041-EN
Electronic
Inspections
Ensureallcommunicationcablesaresecure.
P


 Ensureallelectronicmodulesaresecure. 
P

 CheckphysicalconditionofallexposedPCBs. 
P

 CheckallexposedPCBsfordustbuild-upandcleanifnecessary. 
P

 Checkdischargeandsuctionpressure/temperaturesensorsfor
accuracyagainstcalibratedpressure/temperaturegauges.

P

Refrigeration CheckoperationofIGVassembly. 
P

 Checksystemrefrigerantcharge.
P
 
 Checksuperheat/levelcontrol,ifapplicable. 
P

 Checksystemandliquidlinetoensuresufficientsub-cooled
refrigerantisavailableatliquidlineadapter.
P
 
 Verifydischargecheckvalveoperation.
Ifthereisbackwardgasflowimmediatelyafterstoppingthe
compressor,replacethecheckvalve.
P
 
M-SV-001-EN Rev. H-1/23/2023 Page 275 of 294