Manual

PowerFlex® DC Drive - Frame B SCR Modules 17

Step 6: Install the New

SCR Modules

Install the new SCR Modules in reverse order of removal as detailed in Step

5: Remove the Existing SCR Modules

on page 11.

Important Notes for installation:

• Thermal grease must be applied to the bottom of each SCR Module

before securing it to the heatsink.

• Use the following table to determine the proper tightening torque for the

SCR Modules installed on the heatsink:

• Use the following orientation for installing the SCR Modules:

• Use the following table to determine the proper tightening torque for the

bus bars connected to the SCR Modules:

230V AC Input 460V AC Input

Part Number Final Torque Part Number Final Torque

SK-20P-S7F48 2.5…4 N•m (22…35.4 lb•in) SK-20P-S7F78 2.5…4 N•m (22…35.4 lb•in)

SK-20P-S7F49 4.5…5.5 N•m (40…48.7 lb•in) SK-20P-S7F79 4.5…5.5 N•m (40…48.7 lb•in)

SK-20P-S7F42 4.5…5.5 N•m (40…48.7 lb•in) SK-20P-S7F41 4.5…5.5 N•m (40…48.7 lb•in)

SK-20P-S727F 4.5…5.5 N•m (40…48.7 lb•in) SK-20P-S737F 4.5…5.5 N•m (40…48.7 lb•in)

230V AC Input 460V AC Input

Part Number Final Torque Part Number Final Torque

SK-20P-S7F48 4.5…5.5 N•m (40…48.7 lb•in) SK-20P-S7F78 4.5…5.5 N•m (40…48.7 lb•in)

SK-20P-S7F49 4.5…5.5 N•m (40…48.7 lb•in) SK-20P-S7F79 4.5…5.5 N•m (40…48.7 lb•in)

SK-20P-S7F42 11…13 N•m (97.4…115 lb•in) SK-20P-S7F41 11…13 N•m (97.4…115 lb•in)

SK-20P-S727F 11…13 N•m (97.4…115 lb•in) SK-20P-S737F 11…13 N•m (97.4…115 lb•in)

Gate leads at top

Gate leads at bottom

This SCR Module

only present in

regenerative drives.