Originally Posted by
Eli_Ben
This worked!
I didn't realise you were both talking about the same thing. For the benefit of anyone else with this problem trying to follow along: The tab/jumper on the VFD allows you to easily disconnect the VFD's EMC filter. The filter was causing the GFCI/RCD/RCCB to trip every time the spindle started. So pulling the tab out solves the problem.
But this doesn't seem like a permanent solution as TurboStep, you mentioned that running the mill without the VFD EMC filter isn't a good idea. I'm curious to know what the drawbacks are of disconnecting the filter (not that I'm planning to leave it like that for long - it must be there for a good reason). Davebaldwin, have you replaced the VFD filter with anything? If not, have you noticed any negative effects?
I'd like to mention that Tormach themselves haven't been very helpful at all. They simply told me to consult a local electrician. This was surprising considering that 1) Their customer service is usually great. 2) This appears to be a known issue, and they have a good international customer base so this issue must have come up before. Perhaps they're covering themselves against liability in case something goes wrong.
But you have all been extremely helpful, so thank you!