Powered by Safety
®
54
PowlVac® CDR 27kV & 38kV Vacuum Circuit Breaker
IB-65020A
Recommended Renewal Parts and Replacement Procedures
iv. If the gap needs to be decreased,
hold the high voltage regulator (13)
with channel lock pliers, loosen the
hex head nut (46) and turn the high
voltage regulator disc (13) to the
right. Retighten the hex head nut
(46) and measure the gap again.
2) Closing Coil Assembly
Refer to
SM-1300 Closing Coil Assembly
for
replacement and installation procedures.
3) Primary Shunt Trip Coil Assembly
This assembly (Figure 7, a) is located in the
center part of the mechanism area, just left
of the main closing spring.
CAUTION
CAUTION
!
Ensure that the control circuits are
deenergized and the circuit breaker is
deenergized, disconnected by means of a
visible break, and securely grounded. Do NOT
start to work on a closed circuit breaker or a
circuit breaker with the main closing spring
charged.
Perform the following steps to replace the
primary shunt trip coil assembly:
a. Remove the front cover of the circuit
breaker.
b. Remove the two bolts which hold the
primary shunt trip coil assembly to the
circuit breaker frame and remove the
assembly.
c. Bolt the new primary shunt trip coil
assembly in place and reconnect it to
the wiring harness.
d. Perform the Tripping System
Adjustment found in
Ch 5 Maintenance
,
B. M
echAnISM
A
reA
,
5) Mechanism
Adjustments,
c. Tripping System
Adjustment
.
e. Trip the circuit breaker electrically
several times to ensure that the primary
shunt trip coil assembly is functioning
properly.
f. Replace the front cover.
4) Secondary Shunt Trip Coil Assembly
This assembly is located in the center part
of the mechanism area, just to the right of
the main closing spring. The replacement
procedure is identical to that of the primary
shunt trip coil assembly, with the following
additional information:
CAUTION
CAUTION
!
Ensure that the control circuits are
deenergized and the circuit breaker is
deenergized, disconnected by means of a
visible break, and securely grounded. Do NOT
start to work on a closed circuit breaker or a
circuit breaker with the main closing spring
charged.
Note:
It will be easier to remove the
secondary shunt trip coil assembly if
the right connecting rod is removed.
To remove the connecting rod see
Ch5 Maintenance
,
B. M
echAnISM
A
reA
, 3) Closing Spring Removal.
Perform the following steps to replace the
secondary shunt trip coil assembly:
a. Remove the front cover of the circuit
breaker.
b. Disconnect the secondary shunt trip
coil assembly wiring from the wiring
harness.
c. Remove the two bolts which holds the
assembly to the frame and remove the
assembly.
