Quick Close Breaker Adjustments; Quick-Closing Release Latch; Release Arm Adjusting - GE AK-2-50 Maintenance Manual

GEK-7303 Low Voltage Power Circuit Breakers
reduction unit and through a worm gear and a
planetary g~ar train drives the crank (10, Fig. 10)
with a reduction 1000:1. To remove the motor
and gear-reduction unit, _ proceed as follows:
1 • . Remove the front frame (see SEPARATION
OF FRONT AND R~AR FRAME.)
2. . R emove closing springs and crank-shaft
as illustrate~ iii Fig. -12 and 13.
3. Disconnect the leads from motor and remove
the -wires attached to gear unit housing.
4.
Remove four bolts at the bottom of the
front frame and one bolt at top of gear reduction
unit. The. motor and gear unit may n!JW be removed . •
NOTE:
If it
is desired to replace only the
motor unit, disconnect the motor. leads - and
remove only the hardware fastening it to the
. - -gear-reduction unit. When removing the motor
· only, the front frame should be placed front
· side down to prevenJ. the oil escaping from the
. · gear unit. ·
The gear . reduction
unit
contains 4 ounces of
oil similar to Atlantic Refining Company's Grade
HFS No. 3.
·n
should not be necessary to add
or· change oil except when the gear'.'.'reduction
unit-and motor are disassembled • . - ·
QUICK CLOSE BREAKER · .
ADJUSTMENTS .
The quick close breaker basically differs from
the standard breaker in that ~e p~echarging
_ operati<;m is extended to and slightly past the top
dead- center position of the closing spring assembly.
As _.!tie springs start . to discharge~ to close the
bre_aker, the discharge operation is arrested by
~
pi:ap
and latch arrangement. The subsequent
closing operation is accomplished · by tripping
the-latch to release the prop which in turn allows
the springs to continue the interrupted discharging
operation and close the breaker.
The gear reduction unit for the standard breaker
is ·
not interchangeable with the gear reduction
uniLon the quick close unit because the quick
close gear reduction unit employs a slip clutch
to relieve the pressure that would otherwise
be. exerted between the output crank plate and
the prop. . ·
After the · closing springs have been completely
charged and the prop and latch system are pre-
venting closure
of
the breaker, the closing opera-
tion may be .accomplished by energizing the closing
relay. thni the control relay contacts, or man-
ually- by depressing the push to close lever which
mechanically displaces the latch to allow the
break~r to close. · .
. . .
On drawout breakers an interlock between the ··
breaker and enclosure requires the springs to
be discharged before the breaker can be removed
from the enclosure.
16 .
.' ' c"
Fig. 14A ·
Quick-Closing Release Latch - Fig. 14A
Adjust the engagement of the roiler on the latch
to
1/8 11 ±1/64"
by turning the screw "A". After
adjustment is set, lock the bolt with the hex nut
"B".
Adjust the clearance between the latch and
the roller to 1/32+0-1/64 by turning the screw "C".
D
Fig. 14B
Release Arm Adjusting - Fig. l4B
Adjust release arm screw
"P"
so
that the stroke of
the armature of the closing solen<:>id releases the
roller from the latch with a minimum
of
1/32"
over-travel. ·Check . by
using
1/32" GO and 3/32"
NO· GO gauge between armature · and magnet.