The reason I was asking about the phase converter, was they can produce voltage spikes, but if it has been working with the converter previously, it's not likely to a be problem. Just to be sure, it's probably worth measuring the voltages to make sure they are roughly similar.

Looking at the photo of the cabinet, it looks like the machine takes 3phase plus neutral (I'm assuming the blue wire between the main power switch, and main earth cable is a neutral..).
Again with the phase converter powered up, I would check the voltages. Check the 3 combinations of the phases, then each phase to neutral, then compare neutral to earth. Phase to phase should be similar, then phase to neutral should be similar, however the artificial phase (the one generated by the rotary) will likely be higher, but shouldn't be excessively higher.
On a normal 3P+N setup, neutral to earth should be near zero volts, however depending on the phase converter, it may be floating near normal single phase voltage.