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Maintenance
PowlVac 38™ ARM 3000A Series 4
Vacuum Circuit Breaker
01.4IB.65131
b. Adjustment of Primary and Secondary
Trip Prop
Figure 17 Primary & Secondary Trip Prop
Adjustment
b
c
d
e
f
0.005-0.015"
a
a. Secondary Trip Prop
b. Primary Trip Prop Roller
c. Primary Trip Prop
d. Primary Trip Prop Adjusting Screw
e. Rivet
f. Trip Bar
Perform the following procedures to
adjust the primary trip prop:
1. Remove the main closing spring.
Refer to
2. Adjust the primary trip prop
adjusting screw (
that with the fundamental linkage
in the reset position, the clearance
between the primary trip prop
roller and the secondary trip prop
is 0.005” to 0.015”. The primary trip
prop adjusting screw is accessible
from the rear of the stored energy
mechanism and is located inside
the hole beside the lower middle
insulator supporting the live part
assembly.
3. Replace the main closing spring.
To adjust the pawl perform the
following steps:
1. Remove the escutcheon to gain
access to the head of the bolt
holding the adjusting eccentric.
2. Loosen the bolt slightly.
3. Grip the eccentric with a pair of
slip-joint pliers or a similar tool and
rotate the stop slightly.
4. Tighten the holding bolt with the
eccentric in the new position.
5. While charging the main closing
springs, using the charging motor
to drive the mechanism, observe
the ratcheting operation for
improvement.
6. If the ratcheting operation has not
improved, repeat the preceding
sequence until the ratcheting
operation is smooth. This may
require several charging cycles.
7. When the eccentric is properly set
replace the escutcheon.
Be sure that the escutcheon is
reinstalled on the proper circuit breaker,
since the escutcheon contains the
nameplate with the circuit breaker’s
rating and serial number information.
The serial number of the circuit breaker
is also attached to the circuit breaker
frame near the ground connection on
an engraved metal plate. The serial
number found on the nameplate must
match the number affixed to the frame.
