More Z-Axis Issues

Thanks for persevering, I'm sure we will get it sorted.

Proma THC150 does not have a settable lower limit, just the upper one.
You should check:
-the electrode to nozzle distance, get a piece of thin wire and put it through the hole in the nozzle, check how deep it goes. It should not go over 5 or 6mm.
-the torch height after probing, switch the plasma off, do a probe and check how far is the torch from the material. Some plasma cutters have a hard time transferring the arc from anything above 3mm, some do that easily at 6 or 7 mm.
-the pierce height should be 2 to 4 mm if the plasma can handle it.
-the cut height should be from 0.8 to 1.4mm depending on the torch, nozzle, power and some other stuff.
-grounding, this is the single most important thing in any plasma cnc. Check that you have proper grounding, can be done by just firing the torch in the air not near anything but about 1 meter away from computer and electronics, check the computer while it is sparking, any mouse or keyboard malfunction, screen blanking or flickering, any movement of any motors on the CNC, the grounding is NOT properly done.
The issue you describe is most commonly caused by improper grounding, especially the "computer not responding after the fact" part.

If you are using the 50:1 divider on the PM45 then the Proma would need to be set for the same ratio or if it just measures voltage then it would need to be a vey low voltage.

MakingStuff wrote:

UPDATE:

I got all the parts that I needed to use the ARC OK signal from the Hypertherm. It seems to have fixed the problem with torch turning off at startup. I made several small cuts with the correct pierce height and did not have any issues.

Glad you got it working, thanks for letting us know.