Danfoss Turbocor TT Series, Service Manual

Page: 149 / 294

4.18.3 SCR Removal and Installation
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.
M-SV-001-EN Rev. H-1/23/2023 Page 149 of 294