CR194 Two-High Vacuum Limitamp@’ Control
Step
1.
With the high-voltage door open, push in the door op-
erated release pin as shown in Figure 39. This is not a
normal operation and should only be used for equip-
ment check out or servicing.
Figure 39. Isolation switch handle operation
during equipment checkout
Step 2.
Push in the handle latch release shown in Figure 39
and begin to pull up on the handle. With the handle
in the intermediate position, push down on the top
moving armature of the contactor. The mechanical in-
terlock mechanism should prevent the armature from
fully closing on the contactor.
Step 3.
Release the pressure on the contactor armature and
move the isolation switch handle to the full “ON” posi-
tion (i.e. the handle latch release pops back out).
Step 4.
Push down on the top of the contactor moving arma-
ture and hold it down. The armature should close fully
as if it were energized. Now attempt to press the
handle latch release. The mechanical interlock should
prevent the handle release from going in and you
should be unable to move the isolation switch handle.
Step 5.
Release the pressure on the contactor armature and
operate the isolation switch handle to the full “OFF”
position (i.e. the handle latch release pops back out).
Step 6.
If the mechanism fails to meet any of the above
checks, an adjustment must be made to the interlock
assembly as detailed below and shown in Figure 40.
WARNING:
Before making any adjustments, be sure
that equipment is de-energized, the contactor is in
handle is in an intermediate position with the
handle latch release (Figure 39) fully depressed.
A.
B.
C.
D.
Loosen the bottom locking nut (X), Figure 40,
while holding the top adjusting nut (W) firmly in
position. Also loosen the two retaining nuts at the
top of the armature interlock rod (Y).
Turn the top adjusting nut (W) until the interlock
slider is just slightly below the handle latch release
pusher rod (0.12 inches). See Figure 42 for loca-
tion of pusher rod.
When the proper position has been reached, hold
the top adjusting nut (W) and tighten the bottom
locking nut (X) to hold the adjustment. Finally,
tighten the two locking nuts at the top of the
armature interlock rod (Y).
Test the interlock again by following Steps 1
through 6 above.
Step 7.
Return the isolation switch handle to the “OFF” position.
Figure 40. Adjusting the interlock mechanism
V-Contactor to paw1 engagement
W-Top adjusting nut
Y-Armature interlock rod
X-Bottom locking nut
Z-Contactor armature
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