GE AKR-30 Series Maintenance Manual page 49

So long as the actuator remains i n the Reset posi­
'
tion the breaker can be closed and opened normally
at will. H owever, when a closed breaker rece1ves a
tri p signal from the programmer unit, the actuator i s
energized and its solenoid f l u x opposes t h e m ag n � t,
allowing the spring to release the armatu re; th1s
d rives the trip rod agai nst the trip shaft padd le, tripp­
ing the breaker.
As the breaker opens, the actuator arm-is returned
to its normal (Reset) position via l i n kage d riven by a
crank on the breaker's main shaft. The permanent
m ag net again holds the armatu re captive in readi ness
for the next trip signal.
The trip device requ i res on ly one adj ustment - the
trip rod length. As shown f n Fig. 66, the clearance
between the trip rod and the trip shaft paddle is gaged
by a 0. 1 25 inch diameter rod. Adj ust gap to 0.1 25 inch
±
0.01 5 inch. To adjust, open the breaker and restore
the breaker mechanism to its Reset position. Loosen
the jamb nut, rotate the adj uster end until the proper
gap is attai ned, then reti ghten the jamb nut to 35
i n-lbs.
The actuator is a sealed, factory-set device and re­
q u i res no mai ntenance or field adj ust ment. I n case of
malfunction, the complete actuator unit should be
replaced. When making the electrical connector to
the replacement unit, it i s recom mended that the brea
ker harness be cut at some convenient
new actuator leads solder-sp liced thereto.
The preferred method is to remove the flux shifter
leads from the A M P connector using the A M P extrac­
tion too l, Cat. N o. 3051 83 as follows:
(
BREAKER
CLOSED POS I T I ON
T R I P
P A D DLE
FIG. 64 - FLUX SHIFT TRIP DEVICE AND OP ERATING LINKAG ES
p
oint and the
)
C RANK
S I D E
V I E W
1 . Remove the flux shifter leads from the harness.
2. Referri ng to the cabl ing d i ag rams in Section 1 0.5,
.
the flux shifter leads are RED ifl point B and B LACK i n
point E.
3. Insert the extractor tool over the female pin.
When the extractor tool bottoms out, depress the
plunger and force the wire/socket assembly out of the
connector.
4. No tool is req u i red to i nsert the wire/socket
assembly i nto the connector. Insert the assembly u n­
t i l It snaps i nto place.
5. Verify all sockets are i nserted to the same depth.
IN THE EVENT THAT THE SST TRIP DE­
CAUTION :
VICE MUST BE RENDERED INOPERA TIVE TO
ALLOW THE BREAKER TO CARR Y CURRENT
WITHOUT BENEFIT OF OVERCURRENT PROTEC­
TION, THE RECOMMENDED METHOD IS TO
±
5
SHORTEN THE TRIP ROD BY TURNING ITS AD­
JUSTER END FULL Y CLOCKWISE. THIS PRE­
VENTS ACTUATION OF THE TRIP SHAFT PADDLE.
RESET
L I NKAGE
F R O N T
-
V I E W
49