Positive Interlock; Closing Spring I Nterlock - GE AKR-30 Series Maintenance Manual

SECTION 6-lnterlocks (Cont. )
FIG. 1 5
RACKING SCREW COVER I NTER LOCK
CLOSED POSITION
6.2

POSITIVE INTERLOCK

The function 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
CONN ECT E D and TEST positions, the positive interlock
engages with a ramp cam located in the breaker compart­
ment. This cam raises the interlock lever asse mbly caus­
ing the trip shaft to rotate and prevent the trip latch from
engaging with the secondary latch assembly rol ler. The
breaker is held trip-free and can not be closed d uring this
interval.
6.3 C LOSING SPRING INTERLOCK
The function of the closing spring interlock is to dis­
charge the closing spring as the breaker is being racked
out of its housing. This eliminates the hazard of a com­
pletely charged breaker being discharged after the breaker
is removed from its compartment.
The operation of the closing spring interlock is shown in
the two pictures for Fig. 1 7 . The racking mechanism arms
and the crank are connected to a common shaft. As the
breaker is racked out a pin attached to the crank moves
through a slot tint he mechanism linkage. The linkage is
connected to a lever which engages with a pin on the
closing solenoid armature linkage.
m echanism approaches the DISCONNECT position, the
1 6
INTERLOCK
crank pin reaches the end of the slot in the linkage.
Continued motion of the racking mechanism causes the
linkage to rotate the lever which m oves the c losing sole­
noid armature forward. The armature linkage then releases
the prop, d ischarg ing the closing spring .
The C losing Spring i nterlock should be adjusted to
cause the closing spring to discharge when the racking
mechanism is a minimum of 1 and a maxi m u m of
turns short of the fully racked out position. In this position
the racking handle can no longer be turned . If adjustment is
req uired, use the l i nkage adjusting screws shown in
Fig. 1 7.
racked out position will cause the l ever to m ove past the
pin on the armature l i n kage. This w i l l bind up the overall
interlock. Under these cond itions, conti nued appl ication
of this force will defo r m the l i n kage assem b ly.
When the racking
FIG. 1 6 - POSITIVE INTERLOCK
Note: - Undue force on the racking handle at the fu l ly
2V2