GE AK-2-50 - Operating Mechanisms; Charging the Closing Springs

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
_mediate 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 wi pe 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.
Chargi ng 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