Allen-Bradley 1512B, User Manual

Page: 63 / 108

Rockwell Automation Publication 1500-UM055I-EN-P - December 2021 63
Chapter 4 Maintenance
Isolation Switch Mechanism
Inspection and Maintenance
1. Complete the Power Lock-out Procedure (refer to Power Lock-out
Procedure on page 53 ).
2. Open the medium voltage door.
3. Inspect the condition of the clevis pin and cotter pins shown in
Figure 58 .
Replace any worn parts.
4. If it is necessary to replace the isolation switch operating lever or the
interlock lever, apply Dow Corning 55 O-ring lubricant (Rockwell
Automation part no. RU-8216, or equivalent) to the pivot points before
installing the new components (see
Figure 58 ).
Figure 58 - Isolation Switch Handle Mechanism Lubrication Points
5. Inspect the mounting hardware on the isolation switch operating lever
and contactor interlock rod (see Figure 58 ). Tighten any loose hardware.
6. If an infrared window is available, complete the following steps (during
normal equipment run mode):
a. Using a thermal camera, measure the temperature of the isolation
switch at least every 6 months.
a. Monitor every reading and record temperature variations.
Temperatures above 100 °C (212 °F) is cause for concern. See
Recommended Corrective Action on page 64 .
ATTENTION: To avoid shock hazards, lock out incoming power (refer
to Power Lock-out Procedure on page 53 ) before working on the
equipment. Verify with a hot stick or appropriate voltage measuring
device that all circuits are voltage free. Failure to do so may result in
severe burns, injury or death.
Contactor Interlock Rod
Lubrication Points
(at replacement only)
Interlock Lever
Clevis Pins and Cotter Pins
Threaded Connecting Rod
Isolation Switch
Operating Lever