Are you using the Openbuilds relay box: https://openbuildspartstore.com/iot-...y-power-strip/ to turn it on and off? Or are you trying to control the speed using the 1-10v signal from the "black box" https://openbuildspartstore.com/blac...ontrol-system/ ? If the VFD is working for you now, it's in manual mode. To get it to respond to those 1-10v signals, you need to put it in automatic mode. There should be something in the VFD manual about how to do that.