Arc OK intermitent issues on torch fire

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09 Dec 2020 07:55 - 09 Dec 2020 07:55 #191478 by phillc54
I see from your ini file that you are using Mode 1. PlasmaC does not care about the arc voltage for Arc OK in Mode 1, that is the responsibility of the plasma source, PlasmaC only uses the Arc OK signal from the plasma source.

You seem to have two different issues, one is where it sees the Arc OK then loses it and the other is where it doesn't even see the Arc OK. First of all I would trace all the ARC OK wiring from the plasma source to the 7i76 card, checking for loose connections etc. If you are comfortable opening up the plasma source I would check inside it as well.

If you don't see anything wrong then I would try two things, one would be to add the debounce as described in an earlier post and the other would be to add some contact wetting as described in other threads.
Last edit: 09 Dec 2020 07:55 by phillc54.
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09 Dec 2020 10:07 #191484 by luftlupus
cheers ill check into these things tomorrow.

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10 Dec 2020 01:08 #191542 by luftlupus

Also, if I were you, I would debounce the arc-ok input assuming it is a mechanical relay from your plasma cutter. The following changes will give you 5 servo-thread counts of deounce (if your servo-thread period is 1mS, then a 5mS debounce). This may (or may not) save you some headaches later.

Edit your plas_connections.hal file and make the following changes:



Change:
loadrt  debounce                cfg=3
To:
loadrt  debounce                cfg=3,1


Add:
setp    debounce.1.delay        5
addf    debounce.1              servo-thread



Change:
net plasmac:arc-ok-in hm2_5i25.0.7i76.0.0.input-10  => plasmac.arc-ok-in
To:
net plasmac:arc-ok-in hm2_5i25.0.7i76.0.0.input-10  => debounce.1.0.in
net plasmac:debounced-arc-ok debounce.1.0.out => plasmac.arc-ok-in


So i added this to the hal file

File Attachment:

File Name: plas_connections.hal
File Size:2 KB

if i wanted to add a bigger delay to the arkOK do you know exactly what i would change?

Also checked the wiring and its solid, I did also just update from v0.144 to v0.185 before making this topic.
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10 Dec 2020 03:25 - 10 Dec 2020 03:27 #191550 by snowgoer540

Also, if I were you, I would debounce the arc-ok input assuming it is a mechanical relay from your plasma cutter. The following changes will give you 5 servo-thread counts of deounce (if your servo-thread period is 1mS, then a 5mS debounce). This may (or may not) save you some headaches later.

Edit your plas_connections.hal file and make the following changes:



Change:
loadrt  debounce                cfg=3
To:
loadrt  debounce                cfg=3,1


Add:
setp    debounce.1.delay        5
addf    debounce.1              servo-thread



Change:
net plasmac:arc-ok-in hm2_5i25.0.7i76.0.0.input-10  => plasmac.arc-ok-in
To:
net plasmac:arc-ok-in hm2_5i25.0.7i76.0.0.input-10  => debounce.1.0.in
net plasmac:debounced-arc-ok debounce.1.0.out => plasmac.arc-ok-in


So i added this to the hal file

File Attachment:

File Name: plas_connections.hal
File Size:2 KB

if i wanted to add a bigger delay to the arkOK do you know exactly what i would change?

Also checked the wiring and its solid, I did also just update from v0.144 to v0.185 before making this topic.


You should change this line:

Add:
setp    debounce.1.delay       5

Change the 5 to whatever you feel appropriate. This number (5 in this case) is the number of servo-thread counts. If your servo thread is set to 1mS, this equates to 5mS. Just so you know.

Do you still have issues going on?
Last edit: 10 Dec 2020 03:27 by snowgoer540.
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10 Dec 2020 04:28 #191555 by luftlupus
Yes still same issue persisting. 20-30% of the time the arc will try to fire for a split second then pause and say invalid ArcOK signal. but ran mesh mode like what was suggested and didn't have one issue running 50 cuts. arcOK light was on solid on every cut. I can only thing there's a split second every now and then when the arcOk signal coming back is just that little bit to slow and it pauses itself due to no arcOK.

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10 Dec 2020 04:31 #191556 by phillc54
Is it "valid arc lost" or "no arc detected"

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10 Dec 2020 04:32 #191557 by luftlupus

Is it "valid arc lost" or "no arc detected"

valid arc lost..

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10 Dec 2020 04:34 #191558 by phillc54
Try the following in yout connections.hal file:
setp plasmac.arc-lost-delay 0.1

you can adjust the time to suit, the above is 0.1 seconds.
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10 Dec 2020 07:13 - 10 Dec 2020 07:15 #191564 by luftlupus

Try the following in yout connections.hal file:
setp plasmac.arc-lost-delay 0.1

you can adjust the time to suit, the above is 0.1 seconds.


Ok this is great my "valid arc lost" issue has been resolved i did 120 cuts no worries. Thanks everyone for the help with troubleshooting that issue =)

I then ran some actual cutting jobs and ran into this issue which was the other side to this topic,
Every now and then when it goes to pierce the metal it fires and blows the metal out but thinking it hasnt removed the metal due to no arcOK coming back it tries to start the arc again but the metal is already gone so its got noting to arc onto hence ruining the start point for that cut. >>
Last edit: 10 Dec 2020 07:15 by luftlupus.

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10 Dec 2020 07:17 #191565 by phillc54
When that happens do you notice if the Arc OK led is lit on the GUI.

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