Operating Mechanisms; Charging The Closing Springs - GE AK-2-50 Maintenance Manual

Fig. 8 (8014678) Front view of back frame
assembly - AK-2-50
1. Stationary Arcing 6. Crossbar
Contact
7.
Series Overcurrent
2. Movable Arcing Device
Contact
8.
Movable Inter-
3. Stati9nary Main
mediate Contact
Contact
9. Stationary Inter-
4.
Clamp
_ m ediate Contact
.
5. Movable Main
Contact :
spring load on pin (25) is relieved.
5.. ·Remove pin (~5i and screws (27) and
lift out contacts.
~-- Reassemble contact. s in reverse. orger,
being careful to replace the intermediate contact
in th~ proper position. ·
Movable Intermediate and
_ Main Contacts (F1g. 6) ·
· 1. Remove the movable arcing contacts as
described above.
2. Loosen spring (17).
· 3. Remove braid if present by removing screw
at bottom of contact. · ·
4. Slide link (12) to the side and off of p4l
(7).
5.
Slide ·pins (7) and (18) far enough to the
sid~ to allow the movable intermediate contacts
to be
replaced.
6. Reassemble parts in reverse order.
Always check contact wipe and pressure follow-
Low Voltage Power Circuit Breakers GEK-7303
Fig. 9 (8039669) Front view of back frame
·. ·· assembly - AK-3-50
1. Power Sensor Coil Assembly
.2. Disconnect Plug ·
· 3 . Tr;msformer Taps in Amper~s
ing contact replacement!
.
(See ADJUSTING CONTA_ CT WIPE
AND
PRESSURE).
OPERATING -MECHANISMS
ELECTRICALLY OPERATED . AK-50, -75 ·
and -100; MANU~L AK ·-50
. The ele~trically operated · mechanism includes
a motor and a gear reduction unit, which charges ·
the closing springs (16, Fig. 10) through a crank
shaft (14, Fig. 10). The crank shaft ha~ an arin
with a roller (12, Fig. 10) which rides on the
closing cam (2, Fig. 11). The position· of
this
closing cam roller is shown in · Fig. 11A, 11B,
and llC. The closing cam is. connected to the
center-pole unit through a clevis and through a
. crossbar it controls the opening and closing
of the contacts ~m all pole units.
Charging the Closing Springs (Fig. 10)
1. The mec~anism in position is shown in . .
Fig. llA.
2. The motor turns the crank (10) which
is mounted on the output shaft of the gear reduc-
tion unit. The charging roller, which is on the
face of the crank, has paddle arm
(11)
bearing
on it.
13