Charging Using The - GE AKR-30 Series Maintenance Manual

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5. 3 M ECAHNISM OPERATION
Figure 10 shows the mechanism components in the
Closed, Tripped and Reset positions. The closing spring
is shown in the charged position in all of these details.
Closed Position- As shown in Fig.10A, the movable
contacts are held against the stationary contacts by the
toggle linkage. The toggle linkage is held in position
through the engagement of its cam rollers, item no. 5,
with the prop, item no.
4 &
latch, item nos. 1
Tripped Position - The mechanism goes from the
Closed position to the Tripped position, shown in Fig.
108, when the trip shaft, item no. 10, is rotated by either
the manual trip button or one of the other trip devices.
The trip latch, item no. 11 is assembled to the trip shaft.
When the trip shaft rotates, the trip latch disengages
from the secondary latch roller. The secondary latch
pivots, resulting in the collapse of the toggle linkage.
This collapse along with the opening spring, item no. 15,
causes the breaker contacts to open.
Reset Position - The mechanism is shown in Fig.
10C. The cam, item no. 3, which is assembled to the cam
shaft, item no. 4,
manual operating handle, or maintenance handle. The
cam engages the cam roller and partially extends the
toggle linkage. This allows the secondary latch to pivot
against the front frame as shown leaving a gap between
the trip latch and secondary latch roller. The secondary
latch is now in a position to engage with both the top
latch and cam roller.
The breaker closes
discharges and rotates the cam against the cam roller.
The toggle linkage is fully extended, pivoting the secon­
dary latch from the front frame and engaging it with the
trip latch and cam roller as shown in Fig. 10A.
When the breaker is closed and the closing spring
discharged, the upper cam roller is supported by the cam
rather than the prop. This is the position the mechanism
must be in to check contact adjustment refer to Sectior
8.
2 and the secondary latch/trip
11.
is rotated by the charging motor,
when the closing
AG.
CLOSED
10A
10 11
Prop
2.
Cam
3.
4.
Camshaft
Cam Roller
5.
Trip Shaft
10.
spring
5. 4 CHARGING USING THE MAINTENANCE
HANDLE
The closing spring on electrically operated breakers can
be manually charged by using the maintenance handle
(568B386G1) as shown in Fig. 11. The triangular socket in
the maintenance handle mates with the mechanism's
camshaft extension on the front right side of the breaker.
Using the knob on the handle, it will probably be necessary
to a lign this socket to fit on the end of the shaft.
FIG. 1 1- MAINTENANCE HAN DLE
INSTALLED ON CAMSHAFT EXTEN SION
14 5
FIG. 108 TRIPPED
FIG.10C RESET
Trip Latch
11.
Insulated Coupling
12.
Main Shaft
14.
13.
Secondary Latch
Opening Spring
15.
13