GE Limitamp CR194 - Mechanical Operation Check

CR194 Two-High Vacuum Limitamp* Control
HANDLE AND ISOLATION SWITCH OPERATION
WARNING: Confirm that equipment is de-ener-
gized before performing this check.
REF: HANDLE IN
“ON” POSITION
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.
Step 2.
Push in the handle latch release (See Figure 39) and
move the handle up to the full “ON” position (i.e. the
handle latch release pops back out) by rotating the
handle up with a rapid, positive motion.
Step 3.
The isolation switch contacts may be viewed by looking
through the window supplied in the main fixed barrier
(See Figure 10). The contacts should be fully seated
on all three phases, and the word “ON” should be
visible in three places on the rotating shaft.
Step 4.
Push in the handle latch release (See Figure 39) and
move the handle down to the full “OFF” position (i.e.
the handle latch release pops back out) by rotating the
handle down with a rapid, positive motion.
lOOR
DOOR
INTERLOCK
INTERLOCK
BAR
DEFEATER
Step 5.
WARNING:
By looking through the window on the main fixed bar-
rier, confirm that the isolation switch contacts are fully
open, as indicated by being able to read the word
“OFF” in three places on the movable contact mold-
ing. See Figure 11.
ALL POWER MUST BE REMOVED FROM THE CONTROLLER
BEFORE MAKING THIS CHECK
TO CHECK FOR PROPER INTERLOCKING BETWEEN THE
HIGH-VOLTAGE DOOR AND THE DOOR SAFETY INTERLOCK
THE FOLLOWING CHECK SHOULD BE MADE:
A. OPEN HIGH VOLTAGE DOOR
HIGH-VOLTAGE DOOR SAFETY INTERLOCK
B. WITH THE DOOR OPEN, CLOSE THE ISOLATION SWITCH
AS SHOWN IN FIG. 39
WARNING: Confirm that equipment is de-ener-
gized before performing this check.
The operation of the high-voltage door safety
interlock should be checked per the procedure shown
in Figure 41.
C. CLOSE THE DOOR AGAINST THE DOOR INTERLOCK BAR
D. LOOK THROUGH THE HANDLE CUTOUT IN THE DOOR
AND VISUALLY DETERMINE THERE IS AN OVERLAP
BETWEEN THE DOOR INTERLOCK DEFEATER AND THE
DOOR INTERLOCK BAR AS SHOWN IN THIS FIGURE
E. FOR FINAL CHECK, OPEN THE ISOLATION SWITCH,
CLOSE THE HIGH-VOLTAGE DOOR, RE-CLOSE THE
ISOLATION SWITCH, AND TRY TO PULL THE DOOR
OPEN. THE DOOR SHOULD NOT OPEN.
Figure 41. Checking procedure for high-voltage
door safety interlock
23