GE AKR-30 Series Maintenance Manual page 22

SECTION 7-Breaker Maintenance (Cont.)
7 .5.1 REPLACEMENT
Figs. 22, 23, 24, and 25 show the primary disconnect
assembly breakdown. Refer to these illustrations when
replacing the disconnects. Note the following details:
Fig. 25- The position of the spacer in the breaker stud.
The hole in the spacer must be positioned as
shown so it will align with the holes in the clip.
-
Fig. 24 The engagement of the fingers with the re­
tainer. Also the location of the 'bowtie' spacers in
the fingers, both upper and lower.
-
Fig. 22 & 23 The position of the upper and lower
retainers and, again, the 'bowtie' spacers.
7 .5.2
ADJUSTMENT
The primary disconnect assembly is factory adjusted to
apply a force of 85- 1 05 pounds on a 1/2 thick copper bar
inserted between the upper and lower fingers. After instal­
lation of the disconnect assembly this force range is ob­
tained by tightening the locknuts to set the dimension
shown in Fig. 26. Note that this dimension is measured
between the top of the retainer and the underside of the
washer. Also note that no bar is inserted between the
fingers when setting this dimension.
AUX I LIARY SWITCH
7.6
All electrically operated breakers and manual breakers
having shunt trips are supplied with auxiliary switches.
Depending upon the requirements of the breaker's applica­
tion, the switch may contain from two to six stages. Usually,
each stage has one "'A" contact and one "B" contact. "A"
contacts are opened or closed as the breaker is opened or
closed. "B" contacts are the reverse of this.
The auxiliary switch is mounted on the upper side of the
mechanism frame as shown in Fig. 27. A crank on the main
shaft operates the switch through an adjustable link which
connects it to the switch crank.
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FIG. 26 - PRIMARY FINGER ADJUSTMENT
22
J
:-
-
11
I
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L
-
27
FIG. AUXILIARY SWITCH LINKAGE
REPLACEMENT
7 .6.1
The switch may be dismounted by removing the two
bolts which fasten it to the mechanism frame.
The replacement switch should have its crank shaft set
28
so that the arrow head on the end of the shaft points as
shown in Fig. when the breaker is open.
If a switch is added to a breaker having none, the ad­
justing link will also have to be installed. This is connected
to the pin on the crank which is attached to the main shaft.
It is secured by means of a cotter pin.
AG. 28-
AUXILIARY SWITCH­
CRANK SHAFT POSITION
7.6.2 ADJ USTMENT
If the adjustable link Is installed, its length should be set,
6 3J8
before installing. at
After installing a new switch, its operation should be
checked. Viewing the switch from above, the contacts
toward the front of the breaker are nonnally the "B" con­
Even
tacts. if a special switch is used, it is always the case
two
that the first stages nearest the crank have the "B"
contacts to the front, and the "A" contacts towards the
back. ··A" contacts are closed when the breaker is closed.
"B"" contacts are closed when the breaker is open.
ARROWHEAD
inches, between pin centers.