Hi,
I do the remote ON/OFF of a three phase pump. One problem is that if any one phase is not available, the pump protector trips and somebody has to rest manually. So I am thinking of adding a circuit which can prevent switching on the pump if all phases are not available. My questions are
1) Is there protectors available which will rest automatically when all phase voltages resumes?
2)I am thinking of checking of three phase with transformers, comparator and logic circuit and switching a relay to control the pump (prevent pumping when any phase is missing and permit pump control when all phases are there). Is there any other simpler method?