Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - ForGe Control - Manual (Page 88)

88 Rockwell Automation Publication 7000-UM202B-EN-P - June 2014
Chapter 3 Component Definition and Maintenance
Figure 79 - 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 81 ).
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 heat sink bolts to 13.5 N•m (10 ft•lb.), then loosen each bolt
two complete turns.
Figure 80 - Location of Heat sink bolts
3. Tighten the clamp to the proper force until you can turn the indicating
washers by the fingers with some resistance.
Heat sink bolt location