![]() ![]() ![]() The voltage is 230 VAC at this point, so you would need to get it down to a DC signal that will not blow up your arduino. If you have a larger starter, you may need a larger relay with a interposing relay to pull it in (I've found it difficult to find more than a 10 amp relay board that can be tied to the Arduino).Īs far as feedback that the motor is running, I would try to pick that up down stream of the stop button. Up to a NEMA Size 4 contactor at 230VAC it should take less than 5 amps (inrush) to pull the relay in and a lot less to keep it held in. If it is a smaller starter, a 10 amp relay should hold the coil in. What you have here is a 3 phase motor starter, using 2 phases to start the motor and one phase as a current seal in.
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