GE AK-1-15 Instructions Manual page 23

Air Circuit Breakers Type AK-1-15 and AK...1-25 GEH-1807
As long as the flow of current through the
breaker is in the normal direction, the magnetic
flux of the series coil and the magnetic flux of the
potential coil produce a torque which tends to rotate
the armature counter-clockwise. The calibration
spring also tends to rotate the armature in the
same direction. This torque causes the armature
to rest against the stop screw (9)' attached to a
bearing plate on the right side of the device.
If
the current through the series coil
(1)
is
reversed, the armature
(6)
tends to move in the
clockwise direction against the restraint of the
calibration spring (3). When the current reversal
exceeds the calibration setting, the armature re-
volves clockwise causing the trip rod
(2)
to move
upward engaging the trip paddle
(14)
thereby tripping
the breaker.
ADJUSTMENTS
No adjustments should be made in the field
with the exception of checking for overtravel of the
trip rod. Proper overtravel of the trip rod is
provided,
if
the trip rod 'advances the trip paddle
between 1/32" to 3/64" beyond the point where 'the
breaker trips. To adjust for this amount of over-
travel, lift the trip rod as high as possible after
backing off the adjusting screw in the trip paddle
(14)
so that
it
will not touch the trip rod
(2).
Ad-
vance adjusting screw in the trip paddle
until
you
can just trip the breaker by lifting the trip rod (2)
as far as it will go. Then advance this same
adjusting screw an additional 1-1/2 turns, thereby
assuring positive tripping. Lockingadju;st1ng nut.
Be extremely cautious not to have hands near moving
parts of the breaker when making this adjustment.
REPLACEMENT
After removing the wiring for the potential
coil the reverse current device can be removed
and replaced by following the procedure olitlines
for replacing the series overcurrent device. For
wiring, see Fig. 20.
~
__-_----14
- - - - - - 1 1
;:=-==j----I.
-+----10
1,1, Oft 5 ,01.[ Dft[AK[R
..
..
,WV-J.
..!..
POTIEIrlTIA" 0011. Wlllln.G
....
TYPICAL COHNICTION DIAlPIAN
ct
1. Serielll Coil
2. Trip Rod
3. Spring
4~ Potential Coil
S. calibration Nut
6. Amdure
1. Pole Piecell
1A. Screws
8. Counterweight
9. Stop Screw
10,.
Mounting Serew
11. Screw
12. Trip
C~-
13.
Screw
14. Trip Paddle
Fig. 20 Reverse Current Tripping Device
23