Danfoss TTS400

9. InstalltheTerminalBlockandACBusBars.RefertoSection4.11.23-PhaseMainVoltageInputTerminal
BlockRemovalandInstallationonpage102.
10. ConnecttheSoftStartACwirestotheACBusBars.
11. InstalltheSoftStart.RefertoSection4.14.3SoftStartRemovalandInstallationonpage117.
12. Installthetopcovers.RefertoSection4.1CompressorCoversonpage52.
13. Returnthecompressortonormaloperation.
Table 4-28 SCR Diode Values
Positive (+) Lead Negative (-) Lead Expected Result
1 2 InfinityorOpen
1 3 InfinityorOpen
2 1 InfinityorOpen
3 1 0.3Vand0.45V

4.18.2.3 Gates Verification
1. IsolatethecompressorpowerasdescribedinSection1.8ElectricalIsolationonpage22.
2. Usingneedle-nosepliers,carefullyremovetheSCRGateCableHarnessfromtheSCRs.RefertoFigure
4-140SCRConnections-TTS300/TGS230andFigure4-141SCRConnections-TTS/TGS/TTH/TGHRev.F
andEarlier(ExceptTTS300/TGS230).
3. Usingamultimetersetforresistancemeasurements,placetheleadsonthetwo(2)gateterminals.The
valueshouldbebetween1to25Ω.
4. Reversetheleads.Themeasuredvalueshouldbethesame.
NOTE
Thesevaluescanvarydependingonthemeterbeingusedandtheenvironmentalconditionsatthetime.Itisimportantthatthevaluesbe
consistentbetweenSCRs.

Table 4-29 SCR Gate Resistance Ranges
SCR Model Range
Allmodels 1-25Ω

4.18.2.4 SCR Temperature Sensor
ThissectionappliestoTTS/TGSRevisionGandearliercompressorsonly.TheTTS/TGSRevisionHandTTH
compressorsdonotutilizeanSCRTemperatureSensor.
Figure 4-145 SCR Temperature Sensor Assembly
4.18.2.5 SCR Temperature Sensor Verification
1. IsolatethecompressorpowerasdescribedSection1.8ElectricalIsolationonpage22.
2. RemovetheServiceSideCover.RefertoSection4.1.3.1ServiceSideCoverRemovalandInstallationon
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