Danfoss TTS700

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VerifytheDC-DCConverter.RefertoSection4.24.2DC-DCConverterVerificationonpage204.
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VerifythePWM.RefertoSection4.28.3PWMVerificationonpage226.
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Verifythebearings.RefertoSection4.29.3BearingVerificationonpage230.
3. AnopenF2fusemayindicateaproblemwiththePottedDC-DCConverter.
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VerifytheDC-DCConverter15VACinputresistance(PottedDC-DConly).RefertoSection4.24.2.3
InputResistanceMeasurementonpage205.
4. AnopenF3orF6fusemayindicateaproblemwiththeSoftStartCircuitBoard.
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VerifytheSCRsandSCRgates.RefertoSection4.18.2.1DiodesVerification-Two-HoleMounton
page142.
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Replacethefuse.
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Reapplypower.
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Ifthefusefailsagain,replacetheSoftStart.
5. AnopenF4orF5fusemayindicateaproblemwiththeSoftStartTransformers,SoftStartCircuitBoard,
orDC-DCConverter.
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VerifytheDC-DC15VACinputresistance(PottedDC-DConly).RefertoSection4.24.2.3Input
ResistanceMeasurementonpage205.
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VerifytheSCRsandSCRgates.RefertoSection4.18.2.1DiodesVerification-Two-HoleMounton
page142.
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Ifnofaultycomponentisidentified,replacethefuseandreapplypower.
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Ifthefusefailsagain,replacetheSoftStart.RefertoSection4.14.3SoftStartRemovaland
Installationonpage117.
5.5.3 Troubleshooting an Open Interlock
1. Verifytheinterlock.RefertoSection4.3.2.3InterlockVerificationonpage63.
2. Ensurethereisnoexternalpowerappliedontheinterlockcircuit.
3. IftheInterlockcircuitisdetermineddamagedandwillnotclose,removethewirefromtheI/LOCK-
(neg)attheJ2connectoroftheI/OBoard.
4. MovethewiretotheSPEED-(neg)attheJ2connectoroftheI/Oboard.
5. ThiswillallowtheinterlockcircuittocloseuntilareplacementBMCCisinstalled.
6. AfterreplacingtheBMCC(refertoSection4.27BMCConpage220),replacethewiretotheI/LOCK-
(neg)attheJ2connectoroftheI/Oboard.
5.5.4 Troubleshooting the Inverter
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• • • CAUTION • • •
Repeatedrotormaybelockedorsinglephaseovercurrentfaultscancauseshaftdemagnetization.ItisimportanttorepairanInverter
failurebeforethecompressorisdamagedbeyondfieldrepair.
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1. Downloadthefaultandeventlog.
2. Reviewthefaultandeventlogforany“InverterError”faults.
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Presenceofan“InverterError”faultindicatesprobablefailureoftheInverter.ReplacetheInverter.
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Ifno“InverterError”faultispresent,continuewiththenextstep.
3. VerifytheInverter.RefertoSection4.22.2InverterVerificationonpage176.
4. IftheInverterverificationpasses,buthecompressorwillnotrun,refertoSection4.23.4.1Stator
InsulationVerificationonpage195andSection4.23.4.2StatorResistanceVerificationonpage195.
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