Safety POWELL PowlVac-ND 4 Series, Instruction Bulletin

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01.4IB.77020
4. Insert a 0.045” gauge between the
secondary trip prop adjusting screw
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 4, y) passes
through the side sheets of the stored
energy mechanism frame at the front
of and below the cam shaft. The left
end of the shaft is shaped to make a
latch face and interferes with the close
latch arm (Figure 4, x) , which is fixed to
the cam shaft. The other end of the
close latch shaft is on the right side
of the mechanism and a small lever
attached to it is positioned by a close
bar adjusting screw (Figure 4, ad) .
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.
6. Turn the close bar adjusting screw
3 to 3½ full turns counterclockwise.
Retighten the locking nut holding
the screw.
7. Repeat step 5 . Then CLOSE and
OPEN the circuit breaker to ensure
proper operation.
8. Replace the escutcheon.