GE Industrial Solutions Limitamp AR - Manual (Page 5)

Isolation Switch Handle to Contactor
Mechanical Interlock
The Limitamp AR two-high vacuum starter is equipped with a
quick-make, quick-break isolation switch in each starter. This
isolation switch is not designed to make or break motor load
current. To insure that the isolation switch handle cannot be
operated when the contactor is energized, a mechanical interlock
mechanism is provided between the contactor and the isolation
switch handle. Operation of this mechanical interlock for each
starter should be checked per the following procedure.
WARNING: Confirm the equipment is de-energized before
performing this check.
Figure 8. View of the contactor to isolation switch
mechanical interlock at the vacuum contactor.
Figure 9. Adjusting connecting rod
Step 1: Adjust the nuts to shift the connecting rod position as
shown in Figure 10.
Step 2: With the contactor open the connecting rod should be
adjusted up to a point where the pusher will pass through the
round hole in the connecting rod.
Step 3: Once adjusted tighten the two nuts against the block.
Adjustment Nuts On
the Interlock Assembly
Figure 11. Showing how pusher is blocked when the contactor
is closed.
Figure 10. Showing how pusher is unblocked when the contactor
is open.
To verify that the interlock is properly adjusted push down on
the top of the contactor moving armature and hold it down.
Now attempt to press the handle latch release (pusher). The
mechanical interlock should prevent the handle release from
going in and prevent the handle from being moved.
Pusher Rod
Blocked
Connecting Rod Pusher Rod
CR 194 One/Two-High Vacuum Limitamp ® AR Control Page 5