Machine: Charmilles Technologies, Roboform 22 CNC sinker, Year 2000

Does anyone have any information on tuning the DC servo motors on this machine? I can not find any info in the manuals or online. I have tuned a few different DC servos motors on CNC mills over the years with great success but this EDM is just a different animal I guess. There are no POTS to adjust on the servo amplifier boards. What the heck??

Any help would be very much appreciated.

Thanks