Alstom FKG1X - Page 68

Function description
FK 3-12 spring operating mechanisms
For circuit
brea
kers
06.04.2011
48-020-212EN02
9/15
•
Motor 70.01
starts as
soon as
the control
voltage is
imposed. It
charges
closing spring 70.25 via gearing 79.04, chain wheel 71.42, crank lever
71.43 and closing chain 70.26. This process comes to an end when
crank journal 70.29 with attached closing chain 70.26 has passed top
dead point A and support pin 71.44 of crank lever 71.43 rests against
closing latch 70.05.
•
At the end
of the charging
process, the pair
of winding levers
71.32 is
lifted though the (not shown) disconnecting device. Gearing 79.04 and
motor 70.01, which is shut off via motor limit switch actuating cam 70.22
and motor limit switch 70.24 can now run down freely without imposing
any load on closing latch 70.05.
•
Motor limit
switch 70.24 has
now moved s
o as to
make the cl
osing cir-
cuit, and spring position indicator 70.31 has moved to the «closing
spring charged» position.
•
If motor
voltage drops
out during
the charging
process, the
return-stop
of the pair of winding levers 71.32 keeps chain wheel 71.42 from turning
blackward and thus prevents the unwinding of closing spring 70.25.
•
Circuit breaker
and operating
mechanism
are in
operating state
2
Operating state 2
: steady
Motor Closing
Opening
•
The
circuit
breaker
is
ready
for
closing.