Valid Arc Lost, Thcad 300 config & Plasmac override

funny even with thc disabled I can't cut due to error valid arc lost ...?? shouldn't I be able to cut with thc disabled?

forum.linuxcnc.org/plasmac/38567-plasmac-torch-starting-problem
Same problem, but might not be the same cause. Anyway, you would have to provide us with some halscope traces to be able to help you.

Sorry to hear about your dog!

I think I need to find ou why I have no hm2_7i76e.0.encoder.00.velocity

I will try to provide halscope results.

I think phil was asking for hal , seems I missed one

Lets sort out your Arc voltage first. You calculated these correctly
calculated offset 3540.625l
calculated scale 0.012042148

But you have not entered them in Plasmac.
Have you made the change I said to correct the negative volts?

The problem here is Plasmac's synthesised arc OK. If the cut volts is only showing as 40 volts and you have a Arc OK low threshold set to 80 volts, the ArcOK signal will never come on so the cut will terminate.

So we need to get the Arc Voltage sorted out first. It does not really matter if the wrong voltage is calculated, but the ArcOK low voltage has to be about 50% of the calculated cut volts displayed on the screen.

rodw wrote: The problem here is Plasmac's synthesised arc OK.

I am sure that is not the problem, the settings most probably, but without more info from the OP i am refraining from concluding anything.

tommylight wrote:

rodw wrote: The problem here is Plasmac's synthesised arc OK.

I am sure that is not the problem, the settings most probably, but without more info from the OP i am refraining from concluding anything.

From the original post Fred said the arc was 40 volts but in the screen dump he has the minimum arc OK setting is 80 volts so it will kick in as soon as the timeout expires.

But then he's changed the calibration settings so they are wrong so the first step is to get the Arc voltage and sign reporting correctly

Missed that but noticed most setting are quite off the chart.

You say you don't have If that was the case you would not see an Arc Voltage in PlasmaC and you would get an error on startup as you have this correct line in plasmacthc_connections.hal So you need to do what Rod said and get the arc voltage correct then move ahead one step at a time and don't start cutting until you are at the top of stairs.

CNCFred wrote: Sorry to hear about your dog!

I think I need to find ou why I have no hm2_7i76e.0.encoder.00.velocity

I will try to provide halscope results.

I think phil was asking for hal , seems I missed one

Its in the file you attached here on this post I quote.

I reverted to the setup before I messed with the settings: configured plasmac new:

configs/plasmathc/plasmathc.hal: setp hm2_7i76e.0.encoder.00.scale -1
configs/plasmathc/plasmathc.hal: setp hm2_7i76e.0.encoder.00.filter 1
configs/plasmathc/plasmathc.hal: setp hm2_7i76e.0.encoder.00.counter-mode 1

bad news, thc voltage stays at -43V ...
I will check my hardware setup of thc...


please check also encoder2.txt

thank you for your time,...I will let you know ..