Random arc signal lost

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03 Sep 2020 10:31 #180512 by CBEAR
Replied by CBEAR on topic Random arc signal lost
Yes, the z is all calibrated on both ohmic as well as the float switch.

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03 Sep 2020 10:33 #180514 by phillc54
Replied by phillc54 on topic Random arc signal lost
Does it have the same issue on float and ohmic?

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03 Sep 2020 10:34 #180515 by CBEAR
Replied by CBEAR on topic Random arc signal lost
Yes it does

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03 Sep 2020 10:39 - 03 Sep 2020 10:42 #180516 by phillc54
Replied by phillc54 on topic Random arc signal lost
Maybe try using the lowpass filter.
linuxcnc.org/docs/2.8/html/plasma/plasma...r-guide.html#lowpass
This would be in the <machine-name>_connections.hal.

Edit sorry,that probably won't help as you are using mode 1.
I think you may need to try the Halscope plot so we can see what is happening.
Last edit: 03 Sep 2020 10:42 by phillc54.

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03 Sep 2020 11:01 #180517 by snowgoer540
Replied by snowgoer540 on topic Random arc signal lost

Halscope plot


*shudders* I guess I have another reason to learn Halscope :lol:

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03 Sep 2020 11:04 #180520 by phillc54
Replied by phillc54 on topic Random arc signal lost

Halscope plot


*shudders* I guess I have another reason to learn Halscope :lol:

I know you are trying to put it off but...

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03 Sep 2020 11:08 #180522 by snowgoer540
Replied by snowgoer540 on topic Random arc signal lost

Halscope plot


*shudders* I guess I have another reason to learn Halscope :lol:

I know you are trying to put it off but...


To get a start on things, in this case, I would want to plot the arc-ok signal, and perhaps the voltage of the arc. Would I use the torch on as a trigger?

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03 Sep 2020 11:13 #180523 by phillc54
Replied by phillc54 on topic Random arc signal lost
Yeah, I think that would work

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03 Sep 2020 11:34 #180527 by phillc54
Replied by phillc54 on topic Random arc signal lost
Something else you could experiment with in <machine-name>-connections.hal

Unlink the plasmac Arc OK input .
Add an extra debounce component.
Net the Arc OK signal from the Mesa card to the debounce input and the debounce output to PlasmaC Arc OK .

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03 Sep 2020 11:38 #180528 by snowgoer540
Replied by snowgoer540 on topic Random arc signal lost

Something else you could experiment with in <machine-name>-connections.hal

Unlink the plasmac Arc OK input .
Add an extra debounce component.
Net the Arc OK signal from the Mesa card to the debounce input and the debounce output to PlasmaC Arc OK .


I really need to start writing things down. I had this though on the way to work this morning! I actually thought "I wonder if the Arc-OK is de-bounced". I think the Hypertherm closes a set of dry contacts, so it could be that there needs to be a small debounce before things get under way. Does that mean this stuff is really starting to make sense?! :laugh:

Ok, I just looked, the Hypertherm definitely closes dry contacts. I wonder if that's the problem?

Could you offset the debounce delay by then making your pierce delay a bit shorter, or maybe it really doesnt matter that much?

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