92 Rockwell Automation Publication 7000-UM202D-EN-P - May 2018
Chapter 2 Power Component Definition and Maintenance
Figure 80 - SCR and SPGDB Assembly
Uniform Clamping Pressure
Always maintain proper pressure on the thyristors. Follow this procedure
whenever changing devices or loosening the clamp completely.
1. Apply a thin layer of electrical joint compound (Alcoa EJC No. 2 or
approved equivalent) to the clamp head pressure pad face (Figure 82
).
Apply the compound using a small brush, and gently wipe the pad face
with an industrial wipe until a thin film remains. Ensure no brush
bristles remain.
2. Torque the heatsink bolts to 13.5 N•m (10 lb•ft.), then loosen each bolt
two complete turns.
Figure 81 - Location of Heatsink Bolts
3. Tighten the clamp to the proper force until you can turn the indicating
washers by the fingers with some resistance.
Heatsink bolt location
Do NOT remove the pivot plate
from the PowerCage when
changing devices. If the pivot plate
is removed from the PowerCage,
install it in the proper orientation
per the stamping on the side.
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