Danfoss Turbocor TT Series, Service Manual

Page: 126 / 294

4.15 SCR DC Bus Bar - TTS300/TGS230
The SCR DC Bus Bars pass the DC voltage from the output of the SCRs to the DC Capacitor Bus Bar Assembly. This
procedure does not show the removal of the Soft Start since it is not required. However, if extra room is desired, the
Soft Start can be removed to provide better access to the fasteners that secure the SCR DC Bus Bars to the DC
Capacitor Bus Bar Assembly.
Figure 4-115 SCR DC Bus Bars
4.15.1 SCR DC Bus Bar Removal and Installation
4.15.1.1 SCR DC Bus Bar Removal - TTS300/TGS230
1. Isolate the compressor power as described in Section 1.8 Electrical Isolation on page 22.
2. Using a 10 mm wrench/socket, remove the bolts that secure the (+) and (-) SCR DC Bus Bars to the DC
Capacitor Bus Bars. Refer to Figure 4-116 SCR DC Bus Bar Removal - TTS300/TGS230 for this and the
next two (2) steps.
3. Remove the six (6) M6x16 fasteners that secure the (+) and (-) SCR DC Bus Bars to the SCRs.
4. Remove the SCR DC Bus Bars.
Figure 4-116 SCR DC Bus Bar Removal - TTS300/TGS230
4.15.1.2 SCR DC Bus Bar Installation - TTS300/TGS230
1. Place the negative bus bar on the SCRs. The negative bus bar should be next to the SCR Gate pins
(aligned with the holes identified as #3 on the SCRs). Refer to Figure 4-117 SCR DC Bus Bar to SCR
Alignment on page 127 for this and the following step.
Page 126 of 294 - M-SV-001-EN Rev. H 1/23/2023