Are you sure this is not simply a noise/spike problem on the supplies? From the voltages you mention I'm thinking you may be in North America? I am not very familiar with detail of quite how the 120/240VAC systems are derived in non-commercial settings (other than it's very different to here in the UK!) but from what I could see from the installation in my apartment when I lived there for a while, it looked as if there was a center-tapped transformer across 240V with the 120v supplied from one end and the center-tap and 240 from both ends?
If so then it would be very possible that all manner of random voltage fluctuations and noise could be induced with loads being switched and it sounds like you may have a wiring loop too? Have you tried a good quality filter on the supply to the controller? Another option would be to derive the 120V for the controller from a 240/120v isolating transformer at the machine from the 240v - or perhaps both!
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On 23/03/2025 19:30, seb fontana via groups.io wrote:
I have a CNC machine with 2hp, 3 Phase? 220v motor. I am using a 220v 1 to 3 phase converter. Some times when I turn motor on it will cause the cnc control to go into fault and lose position. I assume its some type of voltage or amp spike but don't know how to check. The motor gets power from the main panel [220v welder line] while the 110v cnc control is powered through remote 220v service panel that supplies the garage.
