120 of 282 M-SV-001-EN Rev. G
4.16.1 SCR DC Bus Bar Removal and Installation
4.16.1.1 SCR DC Bus Bar Removal - TTS300/TGS230
1. Isolate the compressor power as described in Section "1.8 Electrical Isolation" on page 19.
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 4-119 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 4-119 SCR DC Bus Bar Removal - TTS300/TGS230
4.16.1.2 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 4-120 SCR DC Bus Bar
to SCR Alignment" for this and the following step.
Figure 4-120 SCR DC Bus Bar to SCR Alignment
2. Install the positive bus bar beside the negative bus bar (aligned with holes identified as #2 on
the diodes).
3. The curved section of the bus bar should be installed upwards.
4. Insert and finger-tighten the six (6) M6x16 SCR DC Bus Bar fasteners.
5. Insert and finger-tighten the two (2) M6x20 Bus Bar bolts and M6 nuts to secure the SCR DC
Bus Bars to the Capacitor DC Bus Bar.
6. Torque the six (6) M6x16 SCR DC Bus Bar fasteners to 5 Nm (44 in.lb.).
SCR Bus Bar
Fastener, M6x16
- 5 Nm (44 in.lb.)
(6 places)
Capacitor DC Bus Bar to
SCR Bus Bar Bolt, M6
- 10 Nm (7 ft.lb.)
(2 places)
Curved End
Facing Up
Negative (-) Bus Bar
Positive (+) Bus Bar
(+) SCR DC Bus Bar
Location
(-) SCR DC Bus Bar
Location
Gate
Pins
3
1
2
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