GE AKR-30 Series Maintenance Manual page 29

F AND G SWITCH ADJUSTMENT
7 .1 2.2
For proper electrical operation, the F and G mechani­
cally operated switches must operate at the proper point in
the closing c ycle. If these switches are to be replaced,
measure the distance between the tip of the switch button
and the bracket on which they are mounted. When the new
switch is mounted, duplicate the measured dimension,
then check for proper operation.
When a normal closing operation occurs, the ratchet
usually comes to a stop with an arbitrarily designated
1 ,
ratchet tooth No. Fig. 37, engaged by the holding pawl.
This tooth is the one which is In line with an I maginary
line passing through the centers of the camshaft (2) and
the rivet opposite the roller on the ratchet assem bly. It Is
matter of no concern If the action stops on a different
tooth, but it is i m portant to positively identify tooth No.
by the method described.
To check the switch action, after tooth No.
identified, turn the camshaft with the maintenance handle
and count the teeth as they pass the holding pawl. By using
a continuity tester, observe when the switches operate as
the ratchet turns. The normally open F switch on the left will
close, and the G switch will open.
Electrical breakers should operate the switches while
1 0
moving from tooth No.
If this check shows that an adjustment is needed, the
switch to be corrected can be moved closer to or farther
away from the paddle which operates the switches. A very
thin open-end 5/8-inch wrench will be needed to loosen or
tighten the nuts which fasten the switches to the bracket.
7.1 3 DRAWOUT
MECHANISM
The drawout mechanism shown in Fig. 38 moves the
breaker through the DISCONNECTED, TEST, and CON­
NECTED positions. Fig. 39 shows how the d rawout
is mounted to the breaker.
mechanism
ck ng handle is turned, the internally threaded
As the ra i
trunn1on moves on the screw threads, rotating the hex
shaft. on the ends of which are fastened the arms which
engage the f 1xed pins in the draw o
trunn1on travels between the two jamb nuts on the
The
of screw. and the adjustment sleeve, which stops
end t he
movement at the other extreme point of
th
e trunn1on
against the jamb nuts when the
i
travel The trunnion s
out
breaker 1 s fully racked
ll
fu y racked m .
The rackmg mechanism
that the action is stopped in either
sembly operat1on so
d1rect1on at t he prec1sely
set so the trunn1on is against them the relation
that w he n
and the equipment pins they engage is
between the arms
38
shown F1g The length of the sleeve, which is free to
m
slide
on the threaded shaft ,
thread between the sleeve and its collar. This
engagement
to stop the trunn1on when the distance
lengt h 1s a dJ usted
of
between the ends the equipment
.03 2 " . 2 1 8
. . .
to
After th1s
and 1ts collar are locked together
1
has been
1 1 .
to tooth No.
ut ncl r e .
e os u
against the sleeve when
and
i s adjusted at the factory as­
correct point. The jamb nuts are
controlled by the amount of
IS
and breaker studs is
adJustment is made, the sleeve
by the set screw.
1
FIG. 37 - LOCATION OF RATCHET TOOTH
N0. 1
its
1 TOO TH
29