"AndrewV" wrote in
:

Control Power comes in, goes through the 'start' button (normally open),
possibly through some safety switches and on to the coil on the starter
contactor. From a secondary set of contacts *(normally open) on the start
contactor, Control Power goes through the 'stop' button (normally closed)
and any safety switches to the coil on the start contactor.
Upon you pushing the start button and any 'start condition safeties'
satisfied, the coil is energized and pulls in the motor contacts along with
the secondary Control power contact. This secondary contact, creates a
closed loop running through any safety switches and the 'off' button,
effectively holding the coil in the 'on' or 'energized' state.
When you push the 'off' button, or any safety in this closed loop is
opened, power is removed from the coil on the start contactor, thereby
disconnecting power from the motor.



--
Anthony

You can't 'idiot proof' anything....every time you try, they just make
better idiots.

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