More Z-Axis Issues

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21 Nov 2019 23:19 #150866 by MakingStuff
Replied by MakingStuff on topic 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.

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22 Nov 2019 02:45 #150874 by phillc54
Replied by phillc54 on topic More Z-Axis Issues
How is your PM45 connected to PlasmaC?

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22 Nov 2019 12:43 #150905 by MakingStuff
Replied by MakingStuff on topic More Z-Axis Issues

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.

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22 Nov 2019 20:23 #150967 by rodw
Replied by rodw on topic More Z-Axis Issues
What Plasmac mode are you using?
I take it you are using the synthesised ArcOK signal from the Proma?

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22 Nov 2019 20:39 #150968 by phillc54
Replied by phillc54 on topic More Z-Axis Issues
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.

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22 Nov 2019 23:29 #150983 by MakingStuff
Replied by MakingStuff on topic More Z-Axis Issues

What Plasmac mode are you using?


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

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22 Nov 2019 23:33 #150984 by MakingStuff
Replied by MakingStuff on topic More Z-Axis Issues

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?

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22 Nov 2019 23:50 #150986 by phillc54
Replied by phillc54 on topic More Z-Axis Issues
I know nothing about Promas but I imagine it should have a parameter for the Arc OK lower threshold that can be adjusted.

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22 Nov 2019 23:57 #150988 by MakingStuff
Replied by MakingStuff on topic More Z-Axis Issues

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

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23 Nov 2019 00:04 #150990 by phillc54
Replied by phillc54 on topic More Z-Axis Issues
Not sure but worth a try...

I "think" the problem is that Arc OK turns off and PlasmaC then shuts the torch off. PlasmaC reacts in less than two milliseconds so it doesn't need much for it to shut down.

If adjusting the above doesn't fix it then you may need to do some Halscope traces so we can be sure of what is happening.

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