Rockwell Automation 2100M Feeder Circuit Breaker Units Secure Support Pan and ChangeDoor Latch - Manual (Page 9)

Rockwell Automation Publication 2100-IN091A-EN-P - April 2013 9
Feeder Circuit Breaker Units Secure Support Pan and Change Door Latch
Install Units Follow these steps to install the units.
1. Remove the protective caps from the stab openings or open the manual
shutters if present (automatic shutters open as the units are inserted).
2. Place the unit on the unit support pan and slide it into the section until it
is flush with the front of the structure and the power stabs are connected to
the vertical bus.
ATTENTION: De-energize all units before installing or removing.
When installing or removing MCC units, when possible, de-energize, lockout, and
tag-out all sources of power to the MCC. If the MCC units are installed or removed
with power applied to the main power bus, follow established electrical safety
work practices. Refer to the NFPA 70E Standard for Electrical Safety in the
Workplace publication.
Review your company safety lockout and tag-out procedure.
If power sources are connected to the motor control center, use extreme caution
when inserting units. All buses and the line sides of the inserted units are
energized, and contact with these parts can cause injury or death.
All covers and doors must be in place before applying power to the MCC. If units are
removed, they must be replaced with the appropriate items, such as units, doors,
and unit support pans.
ATTENTION: Plug-in MCC units can be heavy or awkward to handle. Use an
assistant or a platform lift device if necessary to help you handle the unit.
ATTENTION: For 0.5 space factor units, a style 3 unit-support pan with bushing
must be used below the unit for proper operation of the latch/interlock
mechanism. If the unit support pan with bushing is not used, the unit could be
removed under load, resulting in injury or death.
TIP Reposition your hands as necessary to properly support the unit while you are
installing the unit into the MCC.
TIP For Feeder units, you need to tilt the top of the unit slightly to the rear to avoid
interference with the top angle latch bracket. If you do not have enough
clearance, you need to loosen the angle latch bracket screw (approximately
two turns) to install the unit.