Danfoss Turbocor TT Series, Service Manual

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4.16 Soft Start SCR Gate Cable
There are two (2) different styles of this cable, one for the Closed-Top Soft Start and one for the Open-Top Soft Start.
Refer to Figure 4-118 Soft Start SCR Gate Cable (Closed-Top Soft Starts) and Figure 4-119 Soft Start SCR Gate Cable
(Open-Top Soft Starts) for the examples of each.
The following steps provide detail on how to replace the Soft Start SCR Gate Cable. Prior to removal, note the
location of the harness routing as this will minimize the installation time of the new harness.
4.16.1 Soft Start SCR Gate Cable Connections
Figure 4-118 Soft Start SCR Gate Cable (Closed-Top Soft Starts)
Figure 4-119 Soft Start SCR Gate Cable (Open-Top Soft Starts)
4.16.2 Soft Start SCR Gate Cable Removal and Installation
4.16.2.1 Soft Start SCR Gate Cable Removal
1. Isolate the compressor power as described in Section 1.8 Electrical Isolation on page 22.
2. Remove the six (6) Soft Start SCR Gate Cable connectors from the SCRs. This may require the use of
needle-nose pliers. Refer to the following figures for this and the next step for the appropriate
compressor model.
l
Figure 4-120 Soft Start SCR Gate Cable Removal - TTS300/TGS230 on page 129
l
Figure 4-121 Soft Start SCR Gate Cable Removal at SCR - TTS/TGS/TTH/TGH Models Rev. F and
Earlier (Except TTS300/TGS230) on page 129
l
Figure 4-122 Soft Start SCR Gate Cable Removal at SCR - TTS/TGS/TTH/TGH Models Rev. H (Except
TTS300/TGS230) on page 129
3. Remove the SCR Gate Cable from the Soft Start.
a. For compressors with the Closed-Top Soft Start, remove the J8 connector.
b. For compressors with the Open-Top Soft Start, remove the J2 connector.
Page 128 of 294 - M-SV-001-EN Rev. H 1/23/2023