CR194 Two-High Vacuum Limitamp@’ Control
Step 5.
While pulling on the high-voltage door, lift up on the
defeater bracket as shown in Figure 48 to allow the
high-voltage door to open.
Figure 48. Lift defeater bracket while pulling
high-voltage
door
Step 6.
To close the high-voltage door with the isolation
switch handle in the “on” position, the procedure
must be done in reverse order, making sure to rein-
stall the door interlock defeater locking bolt.
INSPECTION,
MAINTENANCE & SERVICING
WARNING:
Before performing any inspection,
maintenance or servicing on the equipment all
all load-connected rotating equipment must have
Mechanical Operation Check
Begin any inspection, maintenance and servicing rou-
tine by first performing all the checks in the “Mechani-
cal Operation Check” section, which is part of the “In-
stallation” section of this instruction. This includes:
Isolation Switch Handle to Contactor
Mechanical Interlock
Handle and Isolation Switch Operation
High-Voltage Door Safety Interlock
Control Power Interlock (CPI)
Test Power Interlock (TPI)
Vacuum Interrupter Integrity Test
Then perform the “Vacuum Interrupter Integrity
Test”, which is a part of the “Installation” section of
this instruction.
Vacuum Contactor
Complete maintenance and adjustment instructions
for the high-voltage contactor are presented in GEH-
5306. Refer to that instruction for all problems of ser-
vicing and adjusting the contactor and to the proper
renewal parts bulletin for renewal parts for the
contactor.
Contactor tip life depends on the severity of the ser-
vice, but in any case, it is recommended that the
contactor tip wear be checked at least once a year, or
in very high duty cycle situations, after every 250,000
operations.
Isolation Mechanism
WARNING:
Under no circumstances should the
isolation switch be inspected or adjusted with
power applied to the main bus.
The quick-make, quick-break isolation switch assembly
is adjusted and tested at the factory and under normal
circumstances does not need adjustment. However, if
conditions require, the switch can be adjusted in the
field by following the steps below.
28
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