Plasmac ERROR "Plasmac: already exists"

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02 Apr 2020 08:20 #162432 by sharp_reaper
Here is my config.

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File Name: pronum.zip
File Size:44 KB
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02 Apr 2020 09:30 #162436 by phillc54
The zip file is incomplete but the rar file shows you have a buildbot installation.

So do a LinuxCNC update by using a terminal:
$ sudo apt-get update
$ sudo apt-get dist-upgrade
If that doesn't fix it, do a manual PlasmaC update:
$ python /usr/share/doc/linuxcnc/examples/sample-configs/by_machine/plasmac/configurator.py
If that doesn't fix it can you post /usr/share/doc/linuxcnc/examples/sample-configs/by_machine/plasmac/plasmac_config.hal
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02 Apr 2020 10:10 - 02 Apr 2020 10:15 #162439 by sharp_reaper
Yes, it is a buildbot.
I've done the update and dist-upgrade then reinstall linuxcnc in synaptic and reload the repositories.
Create a new machine config and run configurator and seems to be more complete.
The error does not show. Probably the sample-config files were damaged.

I am testing now the torch on.
Last edit: 02 Apr 2020 10:15 by sharp_reaper.

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03 Apr 2020 08:16 - 03 Apr 2020 08:18 #162544 by sharp_reaper
Was testing Torch ON is working fine.
Can't see the Arc Voltage correctly.
I've connected the pins:
THCAD +5v to TB3 Pin 6 (+5 VP)
THCAD -5v to TB3 Pin 1 (GND)
THCAD FOUT+ to TB3 Pin 7 (ENC A+)
THCAD FOUT- to TB3 Pin 8 (ENC A-)

When is not cutting it shows 83


When is cutting always drops the value to 77


I used the JSCalc.io to calc the scale and offset
My config:
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Last edit: 03 Apr 2020 08:18 by sharp_reaper.

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03 Apr 2020 08:28 #162546 by phillc54
Is your divider ratio exactly what you entered in the calculator?
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03 Apr 2020 08:34 - 03 Apr 2020 08:35 #162547 by rodw
1. Voltage offset should be positive
2. Your Voltage offset is 3640 which seems in the ballpark but I have not seen your calibration sticker 0 volts setting
3. When idle, the velocity is 3592 which is that close to your offset it does not matter. (0.55 volts by your voltage scale)

Have you set these settings in your hal file?
linuxcnc.org/docs/devel/html/plasma/plas...hcad_initial_testing

It might just be your system is counting backwards.
Last edit: 03 Apr 2020 08:35 by rodw.
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03 Apr 2020 08:46 #162548 by rodw

phillc54 wrote: Is your divider ratio exactly what you entered in the calculator?


I don't think he has. I realised the plasma primer needs a bit more info in this Section:
linuxcnc.org/docs/devel/html/plasma/plas..._with_the_mesa_thcad

Because LinuxCNC's hal environment does not support a divide function, Plasmac requires the reciprocal of the Herz per volts to be used in the Voltage Scale. eg in the example above:
1/2520 = 0.000396825396825
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03 Apr 2020 08:54 #162549 by phillc54
How does that compere with linuxcnc.org/docs/devel/html/plasma/plas...#_calibration_values

I tried to do it on my phone but the wine gets in the road...:silly:
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03 Apr 2020 09:14 #162550 by rodw

phillc54 wrote: How does that compere with linuxcnc.org/docs/devel/html/plasma/plas...#_calibration_values

I tried to do it on my phone but the wine gets in the road...:silly:


I know it adds more pins, but I've always maintained the computer should do all the maths as the ohmic.comp does:

I did it this way in my original thcad scaling component which was one of the first posts in the plasma section becasue the maths required to come up with the reciprocal really did my head in, particularly when I coded it in the component!

The two most frequent issues users seem to have trouble with are synthesised ArcOK and voltage scaling. I think that if plasmac configurator did the heavy lifting as my component does, Phills life would be easier!
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03 Apr 2020 09:19 #162551 by phillc54
1. It is not a very complicated formula
2. PlasmaC is not tied to any particular hardware.
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