Issue:

Wiring a ATS480 for 3-wire control

Product Line:

ATS480

Environment:

All

Cause:

Customer desires to wire in a momentary stop and start push button

Resolution:

Wire a normally closed stop pushbutton between the +24 and STOP terminals.

Wire a normally open start pushbutton between the +24 and RUN terminals.

When the soft start is part of an enclosed package or MCC package, then you need to look at the control wiring, for other wiring options.

3-wire control

The run and stop are controlled by 2 different logic inputs.

A stop is obtained by opening (state 0) the STOP input.

The pulse on the RUN input is set until the stop input opens.

On power-up or a manual fault reset or after a stop command, the motor can only be powered once the RUN

input has been opened (state 0) followed by a new pulse (state 1)

Also check with the customer in some cases they will wire the NC stop and NO Start in series with a relay coil and use a contact on the relay to latch the NO start to seal in the circuit.

They would then need to run the +24vdc through one of the no dry contacts on the seal relay, to close +24vdc and run-stop on the soft starter. If they use this type of external 3 wire

control then they will need to wire the soft starter as 2 wire control by jumpering the run/stop together and switching 24vdc to run stop.

Released for: Schneider Electric Hong Kong