The 3 hp 220v motor on my air compressor has died. The compressor is an old industrial unit and I have the 5hp, 3 ph motor that was on it. It is in good shape and I would like to use it with a single phase to three phase VFD. My problem is I don't know how to wire the VFD so the compressor will cycle automatically. It is my understanding the VFD will fry itself if the output current is switched. If the current to the VFD is interrupted, the motor will shut down but will not restart when input current is restored. I can think of two solutions:
1. Restart the compressor manually by pressing the "Start" button on the VFD.
2. Us an unloader valve. The compressor, once started, would run until shut down manually.
Any better ideas?
Bill
1. Restart the compressor manually by pressing the "Start" button on the VFD.
2. Us an unloader valve. The compressor, once started, would run until shut down manually.
Any better ideas?
Bill