Reverse Current Tripping Device - GE AK-2-50 Maintenance Manual

GEK-7303 Low Voltage Power Circuit Breakers
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2B.
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4.
5.
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7.
8.
9.
10.
11.
12.
13.
14.
Trip Paddle
Series Coil
Adjusting Nut
Locking Nut
Trip Rod
Trip Crank
Setting Sealing Screw
Calibration Spring
Potential Coil ·
Calibration Nut
Pole Pieces
Armature
Counter Weight
Stop Screw
Mounting Screw
Screw
Fig. 31 (383A691, 215D175) Reverse current tripping device
The top edge of the movable nut (11) serves
as an index pointer and should be lined up with
the center of the desired calibration mark (15)
to obtain the proper instantaneous trip setting.
The
trip screw (6) on the end of the armature
(7) should be set so that it does not contact the
trip paddle on the trip shaft until the air gap
between armature and pole piece is reduced t!?
3/32 in. or less, measured at the rivet in the
pole piece. Also, the armature mus t have a
91in.imum of 1/32 in. of travel beyond the point
m its motion at which the breaker is tripped.
Replacement of the EC-2, EC-2A device is
accomplished by the same procedure described
for the EC-1 series trip device: however, in some
cases, when replacing an EC-1 device with an EC-2,
EC-2A it will· be necessary to replace the trip
paddles on the trip shaft with ones which are slightly
longer. Wheri required these will be provided with
the replacement trip units • .
NOTE: Pickup settings on the cover of
the EC-2. EC-2A device are calibrated for
1
the specific device. When replacing covers,
replace on associated device. ·