Picked up an older production machine with a 3-phase 1hp motor and the Reeves speed controller (if that makes any difference). I am looking at adding a VFD instead of replacing the motor with a single phase. I noticed the machine has an external heater circuit on it. If I go the VFD route, do I need to still include the heater in the circuit or can I bypass it an rely on the VFD for protection? Thanks in advance as 3-phase is a whole new game for me.