GE AKR-30 Series Maintenance Manual page 194

SECTION 6-lnterlocks (Cont.)
RACKING SCREW COVER INTERLOCK
CLOSED POSITION
6.2 POSITIVE INTERLOCK
The fu nction of the positive interlock is to keep the
breaker trip-free while it is being racked in or out between
the CONN ECT E D and TEST positions.
The positive interlock is located on the breaker left side
as shown in Fig . 1 6 . As the breaker moves between the
CONNECTE D and TEST positions, the positive interlock
engages with a ramp cam located in the breaker compart­
ment. This cam raises the interlock lever assem bly caus­
ing the trip shaft to rotate and prevent the trip latch from
engaging with the secondary latch asse mbly roller. The
breaker is held trip-free and cannot be closed during this
interval .
6.3 CLOSING SPRING INTERLOCK
The fu nction of the closing spring interlock is to dis­
ch arge the closing spring as the breaker is bei ng racked
out of its housing. This elimi nates the hazard of a com­
pletely charged breaker being discharged after the breaker
is removed from its compartment.
The o peration of the closing spring interlock is shown in
the two pictures for Fig. 1 7 . The racking mechanism arms
and the cran k are connected to a common shaft. As the
breaker is racked out a pin attached to the cran k moves
through a slot tint he m echanism linkage. The li nkage is
connected to a lever which engages with a pin on the
closing solenoid armature linkage. When the racking
mechanism approaches the DISCONN ECT position, the
16
FIG.
1 5
•
I NTERLOCK
FIG. 1 6 - POSITIVE INTERLOCK
cran k pin reaches the end of the slot i n the li nkage.
Continued motion of the racking mechanism causes the
li nkage to rotate the lever which moves the closing sole­
noid armature forward. The armature linkage then releases
the prop, d ischarg ing the closing spring.
The Closing Spring i nterlock should be adj usted to
cause the closing spring to di scharge when the racking
mechan ism is a m i n i m u m of 1 and a m axi m u m of 2112
turns short of the fully racked out position. I n this position
the racking handle can no longer be turned. If adjustment is
req u i red, use the l i nkage adj usting screws shown i n
Fig. 1 7 .
Note: - Undue force on the racking handle at the fully
racked out position wi l l cause the lever to m ove past the
pin on the armatu re l i n kage. This will bind u p the overall
i nterlock. U nder these conditions, conti nued application
of this force wi l l defo r m the l i n kage assem bly.