Powell 38PV40ARMM-4, Instruction Bulletin

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49 Maintenance
01.4IB.65131
To adjust the latch check switch perform
the following steps:
1. Remove the main closing spring
Refer to Ch 5 Maintenance,
B. Mechanism Area, 3) Closing Spring
Removal.
2. Rotate the crank arms until the
spring charge indicator displays,
CLOSING SPRING CHARGED.
3. Loosen the two screws which secure
the latch check switch and rotate
the latch check switch about the
pivot screw downward to the lowest
position allowed. The latch switch
contacts are now OPEN.
4. Insert a 0.045” gauge between
the secondary trip prop adjusting
screw ( Figure 19, c ) and latch check
operator. Rotate the latch check
switch upwards until the contacts
are closed. (An audible click of
the contacts will be heard). At the
position where the click is heard
hold the switch and retighten the
two screws which secure the latch
check switch. Remove the gauge.
5. To confirm that the latch check
switch is properly set, slowly depress
and release the manual trip operator
to verify that the latch check switch
OPENS and CLOSES properly. (An
audible click of the contacts will
be heard). The latch check switch
contacts will OPEN as the latch
check operator is moved by the
manual trip operator away from
the secondary trip prop adjusting
screw. Slowly withdraw the manual
trip operator and the latch check
switch contacts should close when
the latch check operator is between
0.045” to 0.015” away from the
secondary trip prop adjusting screw.
6. Depress the manual close operator
and rotate the crank arm until
resistance is felt.
7. Depress and hold the manual trip
operator inward and rotate the
crank arms until the spring charge
indicator displays, CLOSING SPRING
DISCHARGED.
8. Reinstall the circuit breaker main
closing spring.
e. Adjustment of Close Latch Shaft
The close latch shaft (Figure 3, l) passes
through the side sheets of the stored
energy mechanism frame at the front of
and below the cam shaft. One end of
the shaft is shaped to make a latch face
and interferes with the close latch arm
(Figure 3, k), which is fixed to the cam
shaft. The other end of the close latch
shaft is attached to a lever positioned
by a close bar adjusting screw
(Figure 3, r) .
To adjust the close latch shaft perform
the following procedures:
1. Remove the escutcheon.
2. Loosen the locking nut from the
close bar adjusting screw while
holding the position of the close bar
adjusting screw with a screw driver.
3. Back out the close bar adjusting
screw by turning the screw
counterclockwise 2 full turns.
4. Manually charge the circuit breaker
main closing spring with a manual
charging handle until the spring
charge indicator displays CLOSING
SPRING CHARGED.
5. Turn the close bar adjusting screw
clockwise until the main closing
spring discharges, then depress the
manual trip operator to OPEN the
circuit breaker.