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I did not try with VFD. I would say it depends on the type of VFD, but the logic is the same. Novusun will not output any voltage to VFD. Voltage must come from external components, output port from...

I had the same problem as you with Novusun NVEM V2 controller. Didn't know how to connect the relay to the output. Then I found this site and I wired the relay and the resistor according to the...