Drawout Mechanism Position; Slow Closing The Breaker - GE AKR-30 Series Maintenance Manual

SECTION 7-Breaker Maintenance (Cont.)
7.3 D RAWOUT MECHANISM POSIT ION
Maintenance or inspection should be conducted with the
breaker on a workbench. The drawout mechanism must be
placed in the CONNECT position. This will deactivate the
various interlocks which would otherwise prevent the
mechanism or contacts from closing. Engage the racking
handle with the racking shaft and turn clockwise until it
stops.
Remember, before installing the breaker back into its
compartment, the drawout mechanism must be returned to
the DISCONNECT position.
7.4 SLOW CLOSING T H E B REAKER
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 relationships.
Some of the maintenance procedures described later will
involve operating the breaker in this manner. The proce­
dure for slow closing is given below.
The closing spring must be isolated from the
mechanism's camshaft. This is done by disconnecting the
lower spring assembly from the mating camshaft linkage.
Remove the hex-head bolt as shown in Fig. 21 . Remove
this bolt only with the mechanism in the DISCHARGED
position and the spring at its minimum extension.
FIG. 21 - SLOW CLOSING-LOWER SPRING ASM HARDWAR E
20
Remove the hex-head bolt only, do not remove or loosen
the slotted head screw shown in Fig. 21 . Removal of the
slotted head will cause the closing spring to become dis­
engaged from the camshaft with considerable force. Verify
that this screw remains tightened during the slow close
operation.
After the bolt is removed, use the maintenance handle
to rotate the ratchet assembly's roller onto the closing
prop (see Charging Using The Maintenance Handle, sec­
tion 5.4). At this point, the closing prop must be removed
by either pushing the CLOSE button on Manual breakers,
or pushing the closing solenoid armature on electric
breakers (see Fig. 1 3). When the closing prop is removed,
continue turning the camshaft.
is
mechanism in Its fully closed position, the cam will
support the cam rol ler (refer to Fig. 10 & section 5.3) and
the contacts will develop maximum depression.
Push the TRIP button to release the mechanism and
open the contacts.
- The mechanism and contacts will open
CAUTION
with normal speed and force.
When replacing the hex-head bolt, tum the camshaft
with the maintenance handle to align the mating holes in
the lower spring assembly and camshaft l inkage.
The contacts and