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It might be possible depending on the exact servo drive model
Some FANUC drive of that vintage are Analog +-10V controlled

Can you find the actual drive model?
 

Hello, i buyed a Seiki Mori MV40B machine(year1989) that has fanuc controller and servo motors(lost prgogram because of battery). i attach pictures from cabinet and motor plate. I'm trying to retrofit with linuxcnc and mesa boards. Anyone that could give advice about this, i need to change de driver? (fanuc says it's servo amplifier) i can controll with mesa board? There is a lot of information about the posibility of controlling axis with mesa board, spindle with some change of the spindle encoder.... but i haven't find something that is suitable for me.I want to keep de servo motors if possible (because of the cost of new one) and make adaptations to make small costing retrofit, but if is not possible, i want to know if there is o solution for retrofiting with smallest cost . 

The approximately +- 15000 encoder velocity numbers in the video
seem like pure noise. (and negative values should not even be possible)

I would first try jumpering the 'B' input as single ended and see if that helps
(also make sure nothing is wired to either 'B' input)

Do you get steady arc voltage readings when the plasma supply is off?

So as it turned out we have lots of IO on the drives. 24 in and 6 out. So really It will be down to figuring out the spindle. RS485 is an option on the drive, but I know virtually nothing about how that works. Anyone got a link to some "for dummies" instructions? and whether it will work alongside ethercat?


 

I’m sure it’s something very simple that I have got wrong. 

last night I realised that I don’t have an arc ok showing when the torch fires. Checked wiring and it’s all correct. 
Cpc pin 12 goes to input 10 on the Mesa, pin 14 goes to common +.