how to makeTHCAD10 work with pilot arc plasma

Hi everyone, i hope you all went safely through this shitty virus.

I'm currently struggling with my THCAD.
I dont have any variation in voltage according to cut height.

So i think i'm on to something, i'm using a shitty Chinese plasma (waiting for €€€ for a Hypertherm) with HF start.
And the way it works, as i understand it, the arc is generated between the cup shield and the tip, but the shield is ALWAYS connected to ground. So there is no variation according to distance between the plate i'm cutting and the tip.

I would like to cut the connection between the shield and the machine when the ARC OK signal is green (ON)
But i'm at lost here, i need to declare my IO pin to drive a relay in HAL, that i can do i think, but how do i make it interact with the ARC OK bit ?

Need some clarification:
For THC the electrode inside the torch together with the clamp (not ground, it is positive, although it can be grounded ) is used.
The Nozzle is used for striking the arc between it and the electrode, during cutting it has no connection to anything in use.
Are you sure you have a shield on the torch?
Even if you do, it is never connected to anything, that is why all the ones that use ohmic probing have a wire and a contact directly attached to that shield. Shield is normally used to protect and cool and direct airflow for the nozzle.

yes it's connected to ground clamp inside the machine, it's a pilot arc hf system, i should say the nozzle not the shield in ceramic.
The only way to have a variation in voltage depending on distance from plate to nozzle is to cut this wire when arc ok signal is calculated from THCAD input voltage

it's a Panasonic 80 head, very basic and cheap chinese

This one ?

nope that's an even older type,


They guy in your youtube video is modding a regular torch to pilot arc by adding the grond wire to the nozzle, like mine already has.

Sorry but i can not help any further, the nozzle being connected to ground has thrown me off since i never seen that and i have serviced/wired/installed over 30 of them.
The thing is, nozzle connected to ground means the cutting arc is going from electrode to nozzle, not electrode to material as it should. I am sure it does work, but most of the cut power will remain in the torch, not on the material.