54 Rockwell Automation Publication 20B-IN017B-EN-P - September 2011
Chapter 3 Component Replacement Procedures
MOV - AC Input Only
Refer to the figures in Component Diagrams and Torque Specs on page 13 for
these instructions.
Remove Components
1. Read and follow the Safety Precautions on page 9 and Important Initial
Steps on page 11.
2. Locate the MOV assembly.
3. Perform Remove Precharge Board Assembly on page 23
.
4. Note wire placement and connections. Disconnect the MOV ground
wire and its R, S, and T wires at the top nut on the input power terminal
block.
5. Unscrew MOV mounting brackets.
6. Remove the MOV assembly.
Install Components
1. Install the new MOV assembly. Tighten the MOV mounting screw to
2.9 N•m (26 lb•in)
2. Reconnect all wires and connectors for the MOV.
3. Torque the R, S, and T Phase power terminal block nuts to 9.8 N•m (80
lb•in)
4. Reinstall the Precharge Board.
5. Replace all safety shields and enclosure covers before applying power to
the drive.
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