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8. Continue to Section "4.19.3.5 SCR Installation - TTS/TGS/TTH/TGH (Except TTS300/TGS230)" on
4.19.3.4 SCR Installation - TTS300/TGS230
1. Ensure that no residue remains on the contact surface of the SCR Cooling Manifold.
2. If the SCRs are to be reused, inspect them to ensure there is enough thermal paste on the
contact surface. If they require additional thermal paste, spread a thin and uniform coat of
Dow Corning Silicone Heat Sink paste (or equivalent) entirely over the bottom of each SCR
surface. Refer to "Figure 4-165 SCR Heat Sink Paste Application - TTS300/TGS230".
Figure 4-165 SCR Heat Sink Paste Application - TTS300/TGS230
3. Install the SCRs on the SCR Cooling Manifold. The SCR Gate Connectors should be on the same
side as the P/T Sensor. Refer to "Figure 4-166 SCR Orientation - TTS300/TGS230" for this and the
following step.
4. Insert and finger-tighten the six (6) M6x16 SCR to SCR Cooling Manifold fasteners.
Figure 4-166 SCR Orientation - TTS300/TGS230
5. Place the negative bus bar on the SCRs. The negative bus bar should be next to the SCR Gate
Connectors (aligned with the holes identified as #3 on the SCRs). Refer to "Figure 4-167 Bus Bar
Installation - TTS300/TGS230" and "Figure 4-168 Bus Bar Locations - TTS300/TGS230".
6. Install the positive bus bar beside the negative bus bar (aligned with holes identified as #2 on
the diodes). Refer to "Figure 4-167 Bus Bar Installation - TTS300/TGS230" and "Figure 4-168 Bus
Bar Locations - TTS300/TGS230".
7. The curved section of the bus bar should be installed upwards. Refer to "Figure 4-167 Bus Bar
Installation - TTS300/TGS230".
8. Insert and finger-tighten the six (6) M6x16 Bus Bar fasteners. Refer to "4.16.1 SCR DC Bus Bar
Removal and Installation" on page 120 for this and the following step.
9. Insert and finger-tighten the two (2) M6x20 Bus Bar bolts and M6 nuts to secure the SCR Bus
Bars to the Capacitor DC Bus Bar.
Apply paste to
back of SCR
P/T Sensor
SCR Gate
Connectors on
the same side
of the Manifold
Sensor Wire
SCR to SCR Cooling
Manifold Fastener,
M6x16 - 5 Nm (44
in.lb.)
(2 places per SCR)
Summary of Contents for Turbocor TTS Series
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