GE Evolution E9000 Series Installation, Operation And Maintenance Manual page 26

E VO L U T I O N S E R I E S E 9 0 0 0 M OTO R C O N T R O L C E N T E R
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Removal of draw-out motor control
29
center unit
Door-interlock feature
that prevents access to
the disconnect when
the power is ON
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30
Concealed screw used to
defeat the door interlock
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 27. 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 27 and
Figure 28.
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to support its weight as it is fully withdrawn.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 The door over the withdrawn unit can be latched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.)
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.
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 29. Switching the handle to OFF
allows access to the i nterior of the unit.
Each disconnect operating handle is equipped with
an interlock that prevents opening the door when
the disconnect is ON Shown in Figure 31.
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 30. Only qualified personnel
should be allowed to defeat the interlock.
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