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Rockwell Automation Publication 1512A-UM101B-EN-P - December 2021
Chapter 5 Maintenance
Figure 57 - Defeater Pin
4. Open the power cell door.
If it is possible to move the isolation switch handle to the OFF position
for reassembly, follow steps 5…10.
If it is not possible to move the isolation switch handle to the OFF
position for reassembly, follow steps 11…14.
Installing Z-clip with Isolation Switch Handle in the OFF Position
5. Reattach the Z-clip using the self-tapping screws, but do not completely
tighten them.
6. Move the isolation switch handle to the OFF position.
7. Swing the door closed and inspect the position of the Z-clip with respect
to the handle pin.
8. Set the Z-clip so that it is just above the handle pin. Do not set the Z-clip
more than 3 mm (0.125 in.) above the pin. Open the door and tighten the
#10-32 screws (2.7 lb•ft [3.6 N•m]).
9. Close the door and move the handle to the ON position. Verify that the
handle pin overlaps the Z-clip and prevents the door from opening.
10. Move the handle to the OFF position and tighten the 3/8-1.75 in. door
locking bolts.
Installing Z-clip with Isolation Switch Handle in the ON Position
11. Close the door and tighten the 3/8-1.75 in. door locking bolts.
12. Position the Z-clip as shown in
. Ensure the handle pin overlaps
the top portion of the Z-clip.
13. Using the #10-32 self-tapping screws, reattach the Z-clip (2.7 lb•ft
[3.6 N•m]).
14. Complete steps 5…10 at the earliest opportunity to confirm that the Z-clip
assembly is correctly installed.
Defeater Pin
ATTENTION:
The Z-clip assembly must be reassembled to
ensure the interlocking mechanism functions properly. Failure
to do so will let personnel access live medium voltage parts
and may cause severe burns, injury or death.
