GE AK-1-15 Instructions Manual page 18

GEH-180'l Air Circw.t Breakers
Type
AK-1-15and AK-1-25
Fig. 16 X Contactor and Y Relay
The closing solenoid is connected in series
with the main contacts on the X contactor
and is
energized or de-energized when these contacts are
closed or opened, respectively. When the closing
solenoid is energized, its armature (14) is drawn
downward into the coil
(8)
pulling the four Closing
links (1)
in
the same direction. This action
straightens the toggle linkage (19), of the operating
mechanism, thereby closfug the breaker.
As
the
operating mechanism moves into the closed posi-
tion, the prop switch (25) operates, causing the X
contactor coil and breaker closing coil (8) to pe
de-energized.
Adjustment
The
stop nut (13) Fig. 10, should
be
set so that
there is approximately 1/16" clearance between the
nut and the magnet when the breaker is in the open
position. This adjustment is reqUired in order to
allow the mechanism linkage to reset.
Replacements, Fig. 10
Closing Solenoid
1. Remove the X contactor and Y relay (see
"Replacements" under Solenoid Control
System).
2. Remove stop nut (13).
!
r
I
f
L
the Y relay will become energized through the aa
contact of the prop switch (25), Fig. 10. This will
open the circuit to the X contactor coil, thereby
preventing the X contactor from operating. This
feature makes it impossible to operate the closing
solenoid when the breaker is already closed.
It
also provides for cut-off of the closing solenoid and
anti-pump operatiQn.
Adjustments
The only adjuf.'tment required for thif.' system is
on the prop switch (25}z Fig. 10. To make this
adjustment proceed as fOllOwS:
1. Press the trip button in
the
front of the
breaker.
2. Maintain pressure on the trip button and at
the 'same time close the breaker with the
maintenance operating handle, see F:ig•. 2.
S.
The prop switch (25), Fig. 10, should operate
just before the arm.ature (14), Fig. 10,
reaches the end of its stroke. To obtain
this adjustment move the prop switch toward
or away from the prop
(2S),
Fig. 10. Moving
the switch too close to the prop can result in
damage to the switch
if
its operating button
is forced to travel beyond the lim.it .of its
movement. It is also possible, in this case,
for the switch not to togglf3 when the breaker
closes. (When the breaker closes, the prop
mOVeS away from the switch and the button
is
extended). This would leave the bb contacts
closed with the
bre~r
closed, and burn out
the contactor and closing solenoid coils. If,
on the other hand, the switch is too far away
from the prop, it is possible for the bb con-
tacts to remain open when the breaker is
open. This would make it impossible to close
the breaker electrically. This condition could
also result in false tripping even though the
switch may operate, since the thrust of the
switch button is depended upon to move the
prop into position and hold it in place on
breaker closing operations.
Replacements
X Contactor and Y Relay, Fig. 15
1. Remove cover.
2. Disconnect wiring.
S.
Remove .two screws which fasten Y relay to
upper extension of magnet frame.
4. Loosen three screws which fasten X con-
tactor to magnet frame extensions.
5. Replace new device in reverse order.
Prop Switch (25), Fig. 10
1. Remove wiring.
2. Remove locknuts (24) from switch.
3. Replace switch in reverse order.
CLOSING SOLENOID, FIG.
10
The closing solenoid is located directly below
the operating mechanism.
It
consists of a coil (8),
a m.agnet, an armature (14), and foUr closing links
(1).
18
2
1. Uti.
Seren.
Y Relay
2. IItl. Seren. X Contactor
4
3. :It Contadol"
4. Y Ilelay
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=
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