Danfoss TTS350

5.4 SMT Compressor Connection Status Indications
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Disconnected:noconnectionexistswithacompressororremotecompressorhost
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ReadytoConnect:aconnectionwitharemotehost(ifapplicable)hasbeenestablished,butno
compressorconnectionhasyetbeenestablished
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Compressorisstartingup:Thecurrentlyconnectedcompressorisinstartupmode
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Connected:Therehasbeenestablishedaconnectionwitharemotehost(ifapplicable)anda
connectionwithacompressorhasbeenestablishedandverified
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Nocompressorfound:Anyserialportsorconnectionshavebeenestablished,butavalid
compressorconnectionwasnotabletobedetected
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Erroropeningport:Therewasanerroropeningthespecifiedserialport(eithertheportisalreadyin
use,theportnamedoesn’texist,ortherewassomeothererrorattemptingtoopentheserialport)
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Servernotfound:Couldnotconnecttoremotehost
5.5 System and Compressor Level Troubleshooting
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5.5.1 Compressor Voltage Troubleshooting
1. Carefully,removetheMainsInputCover.
2. Verifyallthree(3)phasesofvoltagebeforethemainsfuses.RefertoSection4.11.1.13-PhaseACinput
Verificationonpage100.
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Ifthenameplateratedvoltageispresent,proceedtoStep3
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Ifthevoltageis(+/-10%)outsideofthenameplateratedvoltage,restorecorrectvoltage
3. Verifyallthreephasesofvoltageafterthemainsfuses.
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IfthenameplateratedvoltageispresentproceedtoStep4
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Ifanyofthethreephasesarenotpresent,isolatecompressorpowerthenreplacethefuses
4. IsolatethecompressorpowerasdescribedintheSection1.8ElectricalIsolationonpage22.
5. Inspectallelectronicsforvisibledamage.
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Ifnovisibledamageispresent,proceedtoStep6
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Ifthereisanytypeofvisibledamage,replacethedamagedcomponent(s)
6. VerifyalloftheSoftStartfuses(ClosedToponly).RefertoSection4.14.2.2VerifyingSoftStartFuseson
page116.
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Ifallofthefusesareokay,proceedtoStep7
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Ifanyofthefusesareblown,replacethefuse(s)andreviewthecauseoftheblownfuses-Referto
Section5.5.2.6DeterminingtheCauseofBlownSoftStartFuses(Closed-TopSoftStartOnly)on
page272.
7. VerifytheInvertercabletotheInverterconnectorisinstalledcorrectly.
8. VerifytheDC-DCConverterresistances.RefertoSection4.24.2DC-DCConverterVerificationonpage
204.
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IfDC-DCConverterresistancesarecorrect,proceedtoStep9
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IfDC-DCConverterresistancesarenotcorrect,replacetheDC-DCConverterthenverifythePWM
andbearings
9. InstalltheDCBustestharness.RefertoSection1.10.1GeneralVerificationandInstallationoftheDC
BusTestHarnessonpage26.
10. DisconnecttheJ2(250VDC)andJ3(24VDC)(PottedDC-DC)orJ4(24VDC)OpenFrameDC-DC)outputs
fromtheDC-DCConverter.
11. InstalltheTopCoverthenre-applythecompressorpower.
M-SV-001-EN Rev. H-1/23/2023 Page 269 of 294