Powell 38PV40ARMM-4, Instruction Bulletin

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48 Maintenance
PowlVac 38™ ARM 3000A Series 4
Vacuum Circuit Breaker
01.4IB.65131
16. Repeat steps 9 through 15 until
the breaker does not trip with the
0.090” gauge inserted in the trip coil
armature gap and does trip with the
0.030” gauge inserted into the trip
coil armature gap.
17. Manually CLOSE and TRIP the circuit
breaker so that all springs are
discharged.
18. Perform the latch check switch
adjustment per the procedure found
in Ch 5 Maintenance, B. Mechanism
Area, 5) Mechanism Adjustments,
d. Latch Check Switch Adjustment .
19. Replace circuit breaker front cover.
d. Latch Check Switch Adjustment
The latch check switch adjustment
( Figure 19 ) described is not required
for routine maintenance; however,
the latch check switch may need to be
adjusted after major overhaul, removal
of the mechanism, or tripping system
adjustment.
Figure 19 Latch Check Switch Adjustment
b
Pivot Screw
0.045"
a
c
a. Latch Check Switch
b. Latch Check Operator
c. Secondary Trip Prop Adjusting Screw
Note: Do NOT tilt the armature. Tilting the
armature by applying a load to the
right of the feeler gauges will produce
incorrect results.
13. Choose one of the following steps
according to the TRIP status:
i. If the circuit breaker TRIPPED
during the test performed in
step 12 , increase the gap
between the trip coil armature
and the latch check operator
by bending the latch check
operator downwards slightly
using channel lock pliers or a
small crescent wrench. Repeat
steps 9 through 12 .
ii. If the circuit breaker did NOT
TRIP during the test performed
in step 12 .
14. Slowly depress the trip coil armature
as shown in Figure 1 8. Depress the
handle until the armature contacts
the feeler gauges. The circuit
breaker should trip.
Note: Do NOT tilt the armature. Tilting the
armature by applying a load to the
right of the feeler gauges will produce
incorrect results.
15. If the circuit breaker did not TRIP
during the test performed in
step 14 , remove the feeler gauges
and trip the breaker. Decrease the
gap between the trip coil armature
and the trip lever by bending the
trip lever upwards slightly using
channel lock pliers or a small
crescent wrench.
Note:
Bend the trip lever in very small
increments. This process may take
several attempts.