Still get no arc detected error with THC from polabs

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05 Aug 2021 19:30 - 05 Aug 2021 19:31 #217006 by Giuseppe
here is a short video.

we.tl/t-ATxz25VIp3

i still get the message in Linuxcnc no arc detection.

can anyone give me a tip

I use cut high of 1 mm and 30 amps. pirce high is 3 mm.


 
Last edit: 05 Aug 2021 19:31 by Giuseppe.

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05 Aug 2021 20:54 #217008 by rodw
Always start at the beginning.
1. Does the ArcOK led light on the polabs light up? If not, its not a Linuxcnc problem. Come back when its fixed
2. Do you have the ArcOK output on the polab connected to an input pin?
3. In halsow, does that pin light up when arcOK is active on the polabs (Wiring error if not)
4. Is the Plasmac mode correct?
5. IS the input pin connected to PLasmac?

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05 Aug 2021 21:00 - 05 Aug 2021 21:03 #217010 by robertspark
Item #1 is a yes from the 278mB clip..... who knows about the rest....

looks like its waiting for a transfer signal and shutting off before recieving confirmation of transfer signal.

could be wiring 
could be hal pin linking....
Last edit: 05 Aug 2021 21:03 by robertspark.

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06 Aug 2021 05:01 - 06 Aug 2021 05:05 #217025 by Giuseppe
The connections are ok. In the past sometimes it works ok.
But during cut i often get the message valid arc lost.

Yesterday i try reducing the cut high to 1,5mm and the pierce high also to 1,5 mm and it looks like it starts better.
The voltage is about 80V at this high.
Could it be that it was the problem? that the toarch was too high?

What is the pierce delay setting for?
Last edit: 06 Aug 2021 05:05 by Giuseppe.

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14 Aug 2021 18:58 #217762 by Giuseppe
Still need help. I still going crazy. Arc OK signal works as it will
I don't know what else to do. After five tries it works. Then it works several times in a row. When I turn on the machine the next day, It doesn't work again.
Then I try again 10 times until it works again.
With "ignore arc ok" settings the machine cuts every time.
But i want to use THC :-(

Any one use the polabs THC too?

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14 Aug 2021 21:32 #217771 by snowgoer540
Can you post a backup of your config please?

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14 Aug 2021 22:19 - 15 Aug 2021 01:27 #217773 by snowgoer540
(Deleted)  really need the config.
Last edit: 15 Aug 2021 01:27 by snowgoer540.

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15 Aug 2021 01:26 #217783 by tommylight
Guessing using a synthesized ARCOK so what are the ARC Low and ARC High set to ?

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15 Aug 2021 06:24 #217791 by Giuseppe
Hi,

I'm not sure which config is relevant here. The THC is traded externally. My THC outputs the signals for high, down and ARC OK.

On my THC you can only set delay time, hysteresis and ant-dive limit.
The delay is 2 seconds. I can try to make it even higher Hysteresis is at 6V and AdL at 160V.

i don't know what else cause the arc ok signal.

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15 Aug 2021 09:37 #217799 by snowgoer540
If on qtplasmac:  In the parameters (or settings if present) tab just click “backup config” which will dump a file into your home folder.  

If on plasmac it was on the config tab I think.  

Post that file here.

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