Rockwell Automation Publication 1512A-UM101B-EN-P - December 2021
69
Chapter 5 Maintenance
Emergency Circumvention
Procedure for Power Cell
Entry
The interlocking mechanism of the medium voltage starter is designed to
prohibit access to the power cell while the isolation switch handle is in the ON
position and the isolation switch is closed.
1. Remove the two #10-32 self-tapping screws (2.7 lb•ft [3.6 N•m]) from the
Z-clip and remove the Z-clip from the edge of the MV door.
Figure 56 - Z-clip Assembly
2. Unscrew the two locking 3/8-1.75 bolts for the MV door.
3. Use a flat-headed screwdriver to turn the defeater pin on the right side of
the isolation switch handle.
IMPORTANT
The following procedure is intended to be used only when the
isolation switch cannot be opened as described in the Door
Opening Procedure for either standard or ArcShield™ enclosures.
ATTENTION:
This procedure may expose personnel to energized
medium voltage components. Whenever possible, lock out incoming
power before beginning this procedure. If you are unable to lock out
incoming power, use the appropriate protective equipment and work
practices to avoid shock hazards. Failure to do so may result in
severe burns, injury, or death.
Remove 1/4-20 self-
tapping screws
Handle Pin
Remove Z-clip
