New Project with Mesa 7I96 and THCAD-05

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15 May 2021 16:52 #208930 by TexasCNC
Got it hopefully today or tomorrow I can start making some test cuts. I will try that

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20 May 2021 16:36 #209665 by TexasCNC
Ok I hooked up my machine and hooked up my interface cable as well and I started up the GUI and my arc ok lights is blinking on the bottom. Any reason why? I already switched the cables on my wiring to input to Mesa I flipped the polarity. Do I need to invert the input?

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20 May 2021 17:25 #209669 by TexasCNC
I just noticed that when I remove my ground clamp from table the arc ok led stops blinking. Not sure what that can be.

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20 May 2021 20:07 #209687 by rodw

I just noticed that when I remove my ground clamp from table the arc ok led stops blinking. Not sure what that can be.


You got something wrong. ArcOK is on pins 12 & 14. Connect one of those pins to +24V field power and the other to an input pin for ArcOK. Use Plasmac mode 1.

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20 May 2021 21:21 #209697 by TexasCNC
Yes that’s how I have it. I hit the torch on pulse button and the torch turned on. I was trying to run a simple job but then figured out that I needed to setup the z axis correctly well as far as the touch off and I think I might of screwed up the settings on there. Is there a way to reset the touch off button seeking to default. I had entered a value then was trying compensate the distance where the torch was on and enter another value when pressing the touch off and it way off. But first need to see why arc ok led is blinking.

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21 May 2021 07:43 #209738 by rodw
Still something wrong I think. Relays don't blink, they click. If you are not hearing clicking from your plasma cutter, there is something not right... I would be poking around in halshow

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21 May 2021 13:37 #209755 by TexasCNC
No relay works the torch fires and all but the led on the GUI bottom left arc ok signal is blinking when I connect the ground lead to table. I have pin 12 from interface going to input 10 on Mesa board and pin 14 going to +24v. I flipped the pins 14 going to input 10 and 12 to +24v with the same results. I checked my Hal connections config and it looks right that I have input 10 arc ok.

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21 May 2021 14:37 #209759 by PCW
Sounds like there is sufficient EMI to trigger the 7I96 input
I would either debounce the arc-ok signal in hal or put
a small capacitor (say .01 uF) across the arc ok input
and input common of the 7I96

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21 May 2021 16:08 #209763 by TexasCNC
I am using the same plasma machine I have on my other table that’s running linuxcnc but with a proma that I get raw voltage and the prime has the arc signal that I send to the Chinese breakout board input. No issues there what do I need to enter on my config for the debounce on input 10?

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21 May 2021 19:31 - 21 May 2021 19:34 #209784 by PCW
I think Plasmac already has some facility for adding debounce to the arc-OK signal
I would try that route first. Basically debounce is always needed on 7I96 input for signals
from mechanical contacts, since the 7I96 isolated inputs are quite fast (50 usec or so
response time)
Last edit: 21 May 2021 19:34 by PCW.

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