Rockwell Automation MV SMC Flex Motor Controller (for Series K or later) - Manual (Page 141)

Rockwell Automation Publication 1560E-UM051F-EN-P - June 2013 131
Troubleshooting Chapter 9
Figure 56 - Removal of SCR 2 and SCR 4 (3300 to 4160V, 180/360A)
To Remove SCR 4:
• Remove shorting bar hardware
• Pry Heatsinks 4 and 5 apart
• Extract SCR
To Insert New SCR:
• Apply thin film of electrical joint compound to surfaces of SCR
• Install SCR so that it is seated in locating pin of heatsink (note
orientation of SCR).
• Pry heatsinks to close gap, ensuring that SCR is seated properly in
both its locating pins.
• Rotate SCR so that all leads have same direction.
Proceed to replace SCRs matched pair (SCR 2).
Note: You must replace both SCRs of a matched set.
SCR 4
SCR 2
Shoring Bar Hardware
Heatsink 2
Heatsink 5
Locating Pin
Shoring Bar
Hardware