Function description
FK 3-12 spring operating mechanisms
For circuit breakers
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 so as to make the closing 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.
Summary of Contents for FKG1X
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