Evolution Series E9000 User Manual
18
Removal of Draw-Out Motor Control Center Units
Some units may still have control power applied
from an external source after the unit disconnect
has been switched to the OFF position. Be extremely
careful when removing units from any motor control
center. Failure to observe this precaution can result
in serious injury or death.
The procedure for removing a motor control center unit
is generally the reverse of the procedure for installing a
unit:
1. Ensure that the unit disconnect is in the OFF position,
as shown in Figure 25. For AFM units, ensure that
the stabs are in the “DISENGAGED” position with
indicators showing green.
2. Turn the door latches a quarter turn, open the unit
door and the vertical wiring trough door.
3. Disconnect all field-connected wiring by separating
the pull-apart terminal blocks in the unit. Pass the
terminal blocks and wires into the vertical wiring
trough. Note that the plastic knock-outs in the vertical
wireway barrier can be removed and left within the
vertical wireway, with the field wiring, rather than
threading the wiring and terminals back through
the knock-out.
4. Disconnect any other field-installed wires that are
terminated in the unit. Remove these wires from
the unit, tag them (if desired), and leave them in the
vertical wireway adjacent to the unit.
Be careful with any field wiring removed from a
unit that may become energized. Such wiring
must be adequately insulated to avoid inadvertent
contact. Failure to observe this precaution can
result in serious injury or death.
5. Turn the latches at the top and bottom of the unit a
quarter turn counterclockwise to release the unit.
These latches are shown in Figure 25 and Figure 26.
6. Pull unit out to remove it, being extremely careful to
support its weight as it is fully withdrawn.
7. The door over the withdrawn unit can be latched closed.
8. If desired, a blank door can be ordered to cover the
unused opening. (For large unit spaces, two blank
doors and a horizontal unit shelf may be required.)
Operating Handles, Door Interlocks and
Padlocking Provisions
All Evolution motor control center units are furnished
with disconnect operating handles that are integral
to the unit structure. The position of the disconnect
(ON–OFF for switches or ON–TRIP–OFF for circuit
breakers) is indicated by the position of the operating
handle. The operating handle is interlocked with a catch
on the inside of the unit door to prevent inadvertent
opening of the door when the disconnect is in the ON
position, as shown in Figure 27. Switching the handle
to OFF allows access to the interior of the unit.
Each disconnect operating handle is equipped with
an interlock that prevents opening the door when the
disconnect is ON.
A concealed screw can be turned counterclockwise
with a 5/32” Allen wrench to defeat the door interlock
and access the breaker disconnect when ON, as shown
in Figure 28. Only qualified personnel should be allowed
to defeat the interlock.
Figure 27. Door-interlock feature that prevents access to the
disconnect when the power is ON
Figure 28. Concealed screw used to defeat the door interlock
