310 Rockwell Automation Publication 7000L-UM301F-EN-P - March 2020
Chapter 5 Component Definition and Maintenance
Figure 258 - Snubber and Sharing Resistor Replacement
4. After removing the bus bars, unscrew the two screws holding each resistor
in place. Measure each resistor on the assembly to verify which resistors are
damaged.
5. Apply a thin layer of Electrical Joint Compound (Alcoa EJC No.2 or
approved equivalent) to the contact faces of the new resistors to be
installed. The recommended procedure is to apply the compound to the
pole faces using a small brush and then gently wiping the pole face with an
industrial wipe so that a thin film remains. Examine the pole face before
proceeding to ensure that no brush bristles remain.
6. Install the new resistor(s) on the chill plate and replace the M4 mounting
screws.
7. When all damaged snubber resistors have been replaced, re-assemble the
bus bars with the original hardware.
8. Re-connect any leads that were removed.
9. Install the chill block assembly as described in Chill Block Removal and
Replacement on page 303. Readjust the clamping load as described in
Checking Clamping Pressure
on page 292.
10. Verify the snubber and sharing resistances.
Screws and bus bar
to be removed
Sharing Resistor
Snubber Resistors
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