Powell 38PV40ARMM-4, Instruction Bulletin

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45 Maintenance
01.4IB.65131
5) Mechanism Adjustments
When any maintenance procedure requires
the opening or closing of the circuit breaker
or the charging of any of the stored energy
mechanism springs, exercise extreme caution
to make sure that all personnel, tools, and
other miscellaneous objects are kept well clear
of the moving parts or the charged springs.
Failure to do this may cause serious damage
or injury to the circuit breaker or personnel.
!
WARNING
Several factory adjustments in the stored
energy mechanism are described in this
section.
NO ADJUSTMENT OF THESE
SETTINGS IS REQUIRED FOR ROUTINE
MAINTENANCE
, but they may need to be
adjusted after a major overhaul or removal
of the mechanism.
!
CAUTION
Do not adjust these settings unnecessarily, as
damage to the circuit breaker may occur.
a. Adjustment of Ratchet Wheel Holding
Pawl
The holding pawl support arm
(Figure 3, d) is adjusted by the holding
pawl adjusting eccentric (Figure 3, f) .
If the pawl is not properly adjusted,
there will be a “knocking” noise when
the ratchet mechanism is operating or
the stored energy mechanism will not
ratchet at all.
7. With a slight rocking motion of the main
closing spring assembly, the connecting
rods (Figure 15, e) can now be unhooked
from the spring yoke pins and the
main closing spring assembly can be
removed.
Note: Care should be taken on reassembly
to ensure correct location of the flat
washer, lock washer and spacer
(Figure 16) .
4) Slow Closing of Mechanism
The slow closing of mechanism described
is not required for routine maintenance;
however, it may be a useful procedure
for troubleshooting circuit breaker
misoperation.
1. With the main closing spring assembly
removed, rotate the camshaft so that
the crank arms are pointing downward.
The fundamental linkage will now move
into the reset position.
2. Push the manual close operator inward
and hold it in while operating the
charging handle to rotate the camshaft.
3. When the close release latch arm is past
the close shaft latch plate, the manual
close operator may be released. As the
main closing cam engages the main
cam roller, the jackshaft will commence
to rotate.
4. Continue to operate the charging
handle until the crank arms point
downward. The circuit breaker will
now be closed and there will be a gap
between the operating pushrod lock
nuts and the pivot blocks.
5. Return the circuit breaker to the open
position by depressing the manual trip
operator.
6. To install the main closing spring
assembly reverse the preceding removal
procedure.