Thanks for the link. I'm still just at the research stage for this part of the project.
The 3 phase power is supplied via a 3wire plus earth cable - no neutral is available in the machine so the easy way of tapping one line and neutral is not available.
I did find this prebuilt power supply though on the local Farnell/Element14 site. - will deliver 48V which might do in a pinch.
https://nz.element14.com/xp-power/dn...48v/dp/1634807
In the interim I will see if I can get a 3 phase step down transformer locally - and compare costs.