GE CR194 Installation Instructions Manual page 29

All power must be removed from the
WARNING:
main bus before attempting to adj ust the isolation
swi tch mechanism.
To adjust the isolation switch blade pressure, follow
the steps below:
1.
Step
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 "ON" position.
Step 3.
Remove the isolation switch barriers ( Figure 49) by
removing the retaining screws that hold these in place.
Place the barriers aside, and retain the hardware
for reassembly.
ISOLATION
--... ..
SWITCH
BARRIERS
Figure 49. Isolation switch barriers to remove
for switch adjustment
Step 4.
Near the top end of each switch blade assembly, a screw
and ad justing nut are located along with
spring washer. To adjust the blade pressure, the nut must
be adjusted. Loosen the small set screw located on each
adjusting nut, then loosen the nut.
Step 5.
With your fingers, retighten the nut un til all the
slack is out between the blades, stationary contact,
spring washer and nut, then tighten usi ng a wrench an
additional Ys (one-eighth) turn . This procedure
provides the necessary 0.005 inch spring compression
of the blades.
\
.
. .
· - - ­
belleville type
a
CR194 Two-High Vacuum Limitamp® Control
Step 6.
Tighten the set screw on the nut to lock the adj ust­
ment in position . Use caution to prevent turning the
nut while tigh tening the set screw.
7.
Step
When the isolation switch blade adjustment is com­
plete for all three phases, return the isolation switch
handle to the "OFF" position, then apply a thin coat­
ing of Mobil Temp SHC-32 grease to the contact sur­
faces of the male stab portion of the disconnect.
If adjustment of the pivot point belleville type spring
washers are not planned, the adjustment procedure is
complete, so proceed to Step 6 below.
To adj ust the pivot point belleville type spring wash­
ers, follow the steps below:
All power must be removed from the
WARNING:
main bus before attempting to adj ust the isolation
switch mechanism.
1.
Step
Close the isolation switch by following Steps 1 & 2 above.
Step 2 .
On each phase, loosen the set screw on the lower pivot
point adj usting nut.
Step 3.
Loosen the adj usting nut and then retighten using
your fingers un til the nut is just snug and no side play
of th � parts is evident.
Step 4.
Using a wrench, tighten the adj usting nut an addi­
tional !�:! (one-half) turn and tighten the set screw to
hold the adj ustment in place.
Step 5.
Return the isolation switch to the "OFF" position.
Step 6.
Reinstall the isolation switch barriers. If necessary,
the viewing window may be cleaned before reinstalla­
tion of the barrier. Use a soft cloth and a mild soap
and water solution , or a mild commercial cleaner such
as Windex®.
At the conclusion of this procedure, in­
WARNING:
sure that the isolation switch handle is in the "OFF"
position and all barriers have been reinstalled.
29