More Z-Axis Issues

I ran a rather long program today and it did not lose the arc when the pieces fell in the water. I still have the issue that the arc gets lost in the first 1/10th of a second as I described before. However, about 90% of the time if I hit the pause button to resume, it will start the arc fine and continue. The few times I couldn't get it to start, I had to lower the pierce height and it started. I had to set the pierce height to .030" which seems rather low to me, but it worked. Not sure if it is wearing the consumables faster with such a low setting.

How is your PM45 connected to PlasmaC?

There are 2 pins on the cutter that when connected turn on the plasma cutter. There is a relay that closes that connection when it gets a signal from the 7i96 board. The cutter also is connected to a Proma Compact 150 THC via the (50:1) voltage divider pins. Then the THC is connected to 3 input pins on the 7i96 for Up / Down / Arc Ok.

What Plasmac mode are you using?
I take it you are using the synthesised ArcOK signal from the Proma?

What Plasmac mode are you using?

I am using mode #2. Yes I am using the ArcOK from the Proma.

If you are using the Proma to synthesise the Arc OK it may be worthwhile decreasing the threshold value. I have a PM30 and ended up with mine set at 40V.
It would be best to use the Arc OK from the PM45 itself if it has a CPC port.

Where do I set the threshold value? Is this something on the THC?

I know nothing about Promas but I imagine it should have a parameter for the Arc OK lower threshold that can be adjusted.

There are only 4 settings in the Model Proma I have. I think this is the one you are referencing?

"H - U" (High Voltage) - value of the off load voltage detection
in the plasma cutter - used to detect the main (cutting) arc: 50-
300V by default: 200V