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Figure 4-141 SCR Connections - TTS/TGS/TTH/TGH Rev. F and Earlier (Except TTS300/TGS230)

Figure 4-142 SCR Connections - TTS/TGS/TTH/TGH Rev. H (Except TTS300/TGS230)

4.18.2 SCR Verification



NOTE

AfaultySCRmodulecancausetheDCbusandMainsInputcurrenttobeimbalanced.ThiscanstresstheInverterandStator.IfanSCR

moduleisfoundtobefaulty,thentheInverterandStatormustalsobeverified.



4.18.2.1 Diodes Verification - Two-Hole Mount

1. IsolatecompressorpowerasdescribedinSection1.8ElectricalIsolationonpage22.

2. RemovetheDCBusBarsfromtheSCRs.RefertoSection4.21.3DCCapacitorBusBarAssemblyRemoval

andInstallationonpage168.

3. Usingamultimetersetfordiodemeasurements,placetheblack(-)leadonterminal1oftheSCRand

placethered(+)leadonterminal3.Themeasuredvalueshouldbebetween0.3Vand0.45V.Referto

Figure4-143SCRTerminals-Two-HoleMountonpage143andFigure4-144SCRTerminals-Four-Hole

Mountonpage143forterminallocations.

4. Allotherterminalsshouldreadinfinityoropeninbothdirections(polarity).RefertoTable4-28SCR

DiodeValuesonpage144.

5. PerformthistestforeachSCR.

Page 142 of 294 - M-SV-001-EN Rev. H 1/23/2023

Danfoss TTS700 User Manual

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