GE AKR-30 Series Maintenance Manual page 198

SECTION 7 -Breaker Maintenance (Cont.)
DRAWO UT M ECHANISM POSITION
7.3
Maintenance or i nspection should be conducted with the
breaker on a workbench. The drawout mechanism m ust be
placed in the CONN ECT position . This will deactivate the
various i nterlocks which wo uld otherwise prevent the
mechanism or contacts from closing. Engage the racking
handle with the racking shaft and turn clockwise unti l it
stops.
Remember, before installing the breaker back i nto its
compartment, the drawout mechanism must be returned to
the D I SCONN ECT position.
SLOW CLOSING THE B R EAKER
7.4
Closing the breaker slowly, while observing the action of
the mechanism and contacts, is a good way of judging the
correctness of mechanical and contact re lationships.
Some of the maintenance procedures described later will
involve operating the breaker in this manner. The proce­
dure for slow closing is g iven below.
T h e c l o s i n g s p r i n g m u st be i s o l ated from the
mechanism camshaft. This is done by disconnecti ng the
lower spri ng assembly from the mating camshaft l inkage.
Remove the hex-head bolt as shown in Fig . 2 1 . Re move
this bolt only with the mechanism in the D I SCHA R G E D
position a n d t h e spring a t its minimum extension.
FIG. 2 1 - SLOW CLOSI NG-LOWER SP RING ASM HARDWA R E
20
Remove the hex-head bolt only, do not remove or loosen
the slotted head screw shown in Fig. 2 1 . Removal of the
slotted head will cause the closing spring to become d is­
engaged from the camshaft with co nsiderable force. Verify
that this screw re mains tig htened during the slow close
operation.
After the bolt is removed, use the mai ntenance handle
to rotate the ratchet assem bly rol ler onto the closing
prop (see Charg i n g Using The Mai ntenance H and le, sec­
tion 5.4). At this point, the closing prop m u st be removed
by either pushing the C LOSE button on Manual breakers,
or push i ng the closing solenoid armatu re on electric
breakers (see F i g . 1 3). When the closing prop is removed,
cont i n ue turning the camshaft. When the ;contacts and
mechanism are in the fully closed position, the cam will
support the cam rol ler (refer to Fig. 10
the contacts will develop maxi m u m depression.
Push the TRIP button to release the mechanism and
open the contacts.
CAUTION - The mechan ism and contacts wi l l open
with normal speed and force.
When replacing the hex-head bolt, t u rn the camshaft
with the mai ntenance handle to align the mating holes i n
t h e l ower spri ng assembly a n d camshaft l i n kage.
&
sect ion 5.3) and