Danfoss TTS350

Abearingcalibrationisnotrequiredtohavebeenperformedinordertovalidate(levitate)theshaft.Usingthe
validationprocessinthismannerwillallowthetechniciantoknowiftheshaftcanlevitatefreelyusingthestored
calibrationdata.
5.3.3.2 Save to EEPROM
WhensavingtotheEEPROM,the“latest”calibrationvaluesoverwrite“stored”values.
ThereisnorequirementtosavecalibrationstoEEPROMafterperformingabearingcalibration.Comparingoriginal
factorycalibrationvaluesstoredinEEPROMtothelatestcalibrationallowsdeterminationoflong-termchanges.
SavingtoEEPROMpermanentlyoverwritesexistingstoredcalibrationvalues.“Stored”valuesareusedforstartup
checkatthenextpowercycle.ThepreviousvaluescannotberecoveredoncethenewvaluesaresavedtoEEPROM.
OriginalcalibrationvaluesshouldonlybeoverwrittenwhenreplacingaBMCCinthefield,orwhenrequiredfor
troubleshootingabearingissuewithacompressor.
NOTE
IfthelatestcalibrationvaluesdifferfromthestoredvaluesoutsideofthetolerancessetintheSMT,awarningmessagewillappearwhen
savingtotheEEPROM.
Thiscompareschangesfromthestoredcalibrationtothelatestandmaybeanindicatorofshaft/bearingalignmentchanges.
5.3.4 Create a Calibration Report
Thecalibrationreportcomparescurrentbearingcalibrationvaluestostoredvalues.Thereisnorequirementto
performabearingcalibrationbeforecreatingacalibrationreport.Thereisalsonorequirementforsavingabearing
calibration(ifperformed)toEEPROMbeforecreatingacalibrationreport.
Performthefollowingstepstocreateareport:
1. ClicktheCalibrationReportbutton.
2. Selectalocationtosavethereport.ThereportwillbegeneratedasaPortableDocumentFormat(PDF)
document.
5.3.5 Calibration Report Analysis
1. DatainReport:Thedifferencebetweenthe“LatestCalibration”and“StoredCalibration”islessthan30
percent.
l
Interpretation:Successfulcalibration
2. DatainReport:Onlyoneofthegainvaluesequalszero.
l
Interpretation:Bearingorbearingsensorelectricalfault,oronechannelofthePWMAmplifieris
faulty
l
Action:VerifythePWM
l
Action:Verifythebearings
l
Action:Verifythebearingsensors
3. DatainReport:Morethanoneofthegainvaluesiszero.
l
Interpretation:Incorrectcalibrationprocedureperformed,bearingorbearingsensorelectricalfault,
ormorethanonechannelofthePWMAmplifierisfaulty
l
Action:Beforebeginningthecalibration,verifytheInterlockisopenandallexternal
communicationisdisconnected
l
Action:VerifythePWM
l
Action:Verifythebearings
l
Action:Verifythebearingsensors
Page 266 of 294 - M-SV-001-EN Rev. H 1/23/2023