Retrofit plasma and Hyperterm max 100 HF/HV problems??

Hi Guys.
Well the problem is i want to retrofit a plasma, current motors and electronics are not working correctly.
I will put NEMA 34 whit a 1:5 gearbox -> rack and pinion , only on X,Y axis, Z will be driven with a NEMA24 (using the existing lead screw)
Still not sure , open loop or closed loop steppers (more cabels more chances of EMI)
So all I/O <-> (HOME ,LIMIT , THC , USER BUTTON) will be optically isolated with a relay and additional optocoupler (machine <-> MEASA )
The current setup has an braded cable sleeve around the plasma cable in a drag chain besides all the other cables.
My question is what should i do about HF/HV arc start of the Hyperterm max 100?
I know grounding is imperative.  The CNC electronics box will well away from the plasma transformer.
Add an aditional ground rod?
Kind regards Marko



 
 

Tnx, i will read some more
Hope if i get something wrong i can ask

Here are some of my designs do you have any recomendations?I am planing to use 7i96,Kind regards

Because there are no cutting forces, there is no need for closed loop motors on a plasma machine. The only time I saw missed steps was when the motors overheated which is a result of motor voltage too high and/or velocity or accelleration is too high when deliberately pushing the limits...

Its a big plasma, 3,m x 6m
X axis has two 30mm hgr type rails,
The x axis is made from a strel tube, and has an support beam conectet to y rail
Y axis has one rail, but is masive .
All using rack and pinion
I did a quick calculation , lets assume stepper motor NEMA 34 at 800 rpm @6NM
Gear box 1:5 that is 30NM , radius of the pinion is 18mm , so we get ~1670N
That will be plenty

My idea for ohmic probing.
See attached pictures
Kind regards