GE Industrial Solutions Evolution Series E9000 - Manual (Page 15)

14
Evolution Series E9000 Installation & Maintenance Guide
Figure 26. Quarter-turn latch located at the bottom of the unit.
Removal of Draw-Out Motor Control Center Units
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.
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 verti-
cal 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.
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support its weight as it is fully withdrawn.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 The door over the withdrawn unit can be latched closed.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–OFF–TRIP 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 dis-
connect 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.
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.
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.
Latch