Take a look at the attached schematic. I have this basic setup together on my workbench and it is working fine. I want to do this right the first time so is there anything I am missing?
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So if the controller has an internal dc-dc power supply to make the 12V for the key switch to drive the contactor coil, then somewhere there is a live HV wire going to the controller all the time?With this Kelly controller you actually don't need 12v to activate the contactor. It's working perfectly on my bench just like it is drawn here (minus the buss bars and breakers).