In a commercial compactor, an electric door lock is energized whenever
the drive motor is operating. After the door is properly closed, the latch
switch enables the motor control circuitry. Then the motor control center
(MCC) energizes the drive motor starting a compaction cycle. The ECS
Series is set for overcurrent sensing. As soon as the motor starts
operating, the ECS senses the current and closes its output contacts.
These contacts energize the backup door lock. The latched and locked door
cannot be opened during the operation of the compactor. A
limit switch allows the door to be unlocked at the end of a complete
cycle.
In many automated processes, loading and unloading conveyors, exhaust
fans, pre-purge blowers, etc. have to be operating before the primary
operation begins. An exhaust fan must be operating before grain can be fed
to a bag filling machine. The interlock prevents operation of the feed
conveyor until the exhaust fan is operating. The interlock must sense the
operation of the motor or load before the second load is allowed to energize.
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MCC=Motor Contactor Coil |
