Tripping The Breaker; Adjustments; Replacement; Rear View Of Front Frame - Ak-50 - GE AK-2-50 Maintenance Manual
Low-voltage power circuit breakers
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Also See for AK-2-50:
- Maintenance instructions manual (48 pages) ,
- Installation and operation manual (7 pages) ,
- Installation and operation manual (10 pages)
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Fig.
1i
(8018989) Rear view of fronnrame-
AK-50 showing cam shaft locking plate
being loosened
~
2..
As the
crank.
roller (7) passes its top
dead-center position, (maximu.m spring charge
position) the closing springs are free to discharge.
Crank (10) can be overdriven independently of the
motor
so-
that roller
(7)
assumes its bottom dead-
center position without restraint.
:-
·
3 .
As the springs discharge, the rotation of
the
crank shaft
'
(14) causes roller
(15,
Fig.
11)
to rotate cam (2, Fig.
11)
and
raise
clevis (13,
F.ig.
11).
Prop
(16,
Fig.
11)
holds cam (2,
Fig.
llC) in this
position~
4.
Raising clevis (13, Fig. llC) closes the
breaker contacts through the pole base linkage.
Tripping
the
Breaker (Fig.
11)
·Operation of -any of the trip devices rotates
the trip shaft
(11)
which
;µlows
the trip latch
(10)
to release the latch prop
(5).
This allows the
forces of the
·
contact and opening springs to
reposition the operating mechanism
linkage
to
the position shown
in
Fig. llA,
In
this
position,
the
operating
·
cycle may be repeated.
Adjustments
(Fig.
11)
All adjustments should be made with the opera-
ting
mechanism·
in
the reset
position as shown in
Low Voltage Power Circuit Breakers GEK-7303
'
.. . .
'
;
..
~
..
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:
....
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·•.
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•1:
.
..
.
!:.:
Fig. 13 (8018984) Rear view of front frame-
AK-50 showing cam shaft
locking
plate
~nd cam shaft removed
-
Fig. llB.
(The mechanism should be reset by
manual operation
with_
the safety pin in place
and
with roller
(15) clear of cam -(2).
1.
The gap between.the trip latch (10) .and
the
roller (9) of the reset latch should be between
1/64
in,
and
1/32 in.
This adjustment can be
obtained by turning sc.rew
(6)..
-
·
-
2.
·
The center line of the
trip
latch (10)
should pass through the center of the roller
(9).
The
latch buffer stop on the mechanism frame can
be adjusted by
loosening
the retaining screws to
reposition
the
latch
with respect
to
the
roller.
3.
The
.
distance between ·the
roller
on
link
(3) and prop
(5)
should be between
1/64
in.
and
1/
32 in.
To
obtain this gap, advance or
retard
the nuts
(4A)
on -the bottom of the ~d ~ing
.the reset spring
(4).
Replacement
When
replacing
the operating mechanism, refer
to
the section
titled
SEPARATION OF
FRONT
AND BACK
FRAMES
under MAINTENANCE
in
these instructions.
The
motor
is
mounted on the side of
the
gear-
15
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