Adjustments; Replacement; Electrical Control Components - GE AKR-30 Series Maintenance Manual

SECTION 7-Breaker Maintenance ( Cont.)
The mechanism i s reset by disengaging the side latch
link from the upper latch link or by closing the breaker if a
locklever is not provided. The side latch l ink, is activated
only by pushing the TRIP button or operating the shunt trip.
A slide attachment on the TRIP button shaft moves
against the side latch link when the TRIP button is pushed.
This slide attachment is factory adjusted to activate the
side latch before the breaker is tripped. A second arm on
the shunt trip also activates the side latch link when the
shunt tri p is energized.
7.1 1 .2
ADJ USTM ENTS
If a breaker is equipped with a bel l alarm/lockout device
orig inally, all the adjustments are made at the time of
assembly. Switch operation is control led by means of
shims of insulating material placed between the switch
body and the bracket to which it is fastened. The adjust­
ment screw is positioned so that when the locklever is in its
activated position, it holds the breaker mechanism latch in
the tripped position.
Check that TRIP button shaft and shunt trip operations,
besides tripping the breaker, displace the side latch and
prevent the bel l alarm switch from operating. The other trip
devices and interlocks must activate the bell alarm when
they open the breaker.
The bracket assembled to the TRIP button shaft m ust be
adjusted so that it will displace the side latch when or
before the shaft opens the breaker. Maintain a .030 inch
minimum gap between the bracket and the side latch when
the breaker is closed. A . 1 87 i nch depression of the TRIP
button must not trip the breaker, but a .375 inch depres­
sion must trip the breaker and displace the side latch.
W RELAY
X - R ELAY
FIG. 36A - ELECTRICAL CONTROL COMPONENTS
7.1 1 .3

REPLACEMENT

The bel l alarm is mounted on the right hand side of the
breaker at the rear of front frame. It is located under the
mechanism main shaft.
The be l l alarm is removed by passing it through a cutout
in the rear bend of the front frame, slipping it between the
front frame and trip shaft and out through the bottom of the
breaker as fol lows:
1 . Remove the 4 bel l alarm mounting screws from the
bottom of the front frame.
2. If the crank which is part of the main shaft has a bel l
alarm activating pin assembled to both sides, remove these
pi ns.
3. Insert the flat of the mai ntenance handle between the
top of the left hand side buffer block and the end plate
assembly. This should eliminate any interference from the
main shaft duri ng the bel l alarm removal.
4. The trip shaft m ust be moved to allow the bel l alarm to
fit beteen it and the front frame. Remove the retaining ring
holding the right hand tri p shaft bearing to the mechanism
frame. Slide the bearing from the frame and along the trip
shaft. There will now be enough trip shaft movement to slip
the bel l alarm past.
5. Install the replacement bel l alarm in reverse order.
6. Check the adjustments given in Section 7.1 1 .2
A bel l alarm with a lockout assembly or a bel l alarm in­
stalled on a 2000 amp frame (AKRT 50/50H) breaker may not
work with the above procedure. If this is the case, the
breaker front and back frame will have to be seperated.
ELECTRICAL CONTROL COMPON ENTS
7.1 2
The operation of the electrical control components i s
described i n Section 5.2. The location o f these components
is shown in Fig. 36A.
CHARGING
MOTOR
G SWITCH
SWITCH
F
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