Danfoss TTS350 - SCR Removal and Installation; SCR General Removal; SCR Removal - TTS300;TGS230

4.18.3 SCR Removal and Installation
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4.18.3.1 SCR General Removal
1. IsolatethecompressorpowerasdescribedinSection1.8ElectricalIsolationonpage22.
2. RemovethemainsinputcablesfromtheTerminalBlock.
3. ContinuetoSection4.18.3.2SCRRemoval-TTS300/TGS230forTTS300/TGS230compressors;forall
otherTT/TGcompressors,continuetoSection4.18.3.3SCRRemoval-TTS/TGS/TTH/TGH(Except
TTS300/TGS230)onpage150.
4.18.3.2 SCR Removal - TTS300/TGS230
1. DisconnecttheSCRGateconnectorsfromeachrectifier.RefertoFigure4-153FuseBlockAssemblies-
TTS300/TGS230forthisandthefollowingfour(4)steps.
2. Removethethree(3)fastenersthatconnectthefast-actingfusestotheSCRs.
3. Removethesix(6)FusetoTerminalBlockfastenersthatsecurethefusestotheTerminalBlockAdapter.
4. Removethefuses.
5. RemovetheinsulatingMylar.
Figure 4-153 Fuse Block Assemblies - TTS300/TGS230
6. Removetheboltsthatsecurethe(+)and(-)SCRBusBarstotheDCBusBars.RefertoFigure4-154DC
BusBarRemoval-TTS300/TGS230onpage150andFigure4-155SCRRemoval-TTS300/TGS230on
page150forthisandthefollowingtwo(2)steps.
7. Removethesix(6)M6x16fastenersthatsecurethe(+)and(-)SCRBusBarstotheSCRs.
8. RemovetheDCBusBars.
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