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You can use a THCAD2 or  THCAD-10 with a series resistor
or resistors, for example  2.4M will give a 250V full scale range.

Mesa has a set of three .4W  1M .1% resistors for this purpose, when used
with a THCAD-10  or a THCAD2 set for 10V you get:

1 = 110V full scale
2 in series  210V full scale
3 in series  310V full scale

Note that lower voltage ranges improve resolution so the 210 V range is fine for most
plasma systems as it will accept continuous inputs over 1000V without damage
and voltages over 200V are not typically useful when cutting.

www.stahlwerk-schweissgeraete.de/Plasmas...ider-CUT-50-SThtml_1
www.stahlwerk-schweissgeraete.de/Plasmas...er-CUT-60-Pilot-IGBT
www.stahlwerk-schweissgeraete.de/plasma-schneidbrenner-p60
-
www.stahlwerk-schweissgeraete.de/plasmas...-cut70-pilotzuendung
www.stahlwerk-schweissgeraete.de/zubehoe...r-p-80-cnc-edelstahl
Kein divider, und kein ARC_OK, aber
noch 2 mal die 1MOhm/2W resistors und ein "reed switch/reed relay" ist alles notig, etwa 5 Euro total
dan die THCAD2 von Mesa
www.welectron.com/Mesa-Electronics-THCAD...n-A-D-Accessory-Card
sehe
linuxcnc.org/docs/devel/html/plasma/plas....html#_arc_ok_signal
forum.linuxcnc.org/plasma-laser/52203-th...able?start=30#299935
forum.linuxcnc.org/plasma-laser/52203-th...able?start=30#299958
linuxcnc.org/docs/2.8/html/plasma/plasma...ide.html#reed-arc-ok
-
forum.linuxcnc.org/plasma-laser/35349-op...ea-and-a-lot-of-info

That should pretty much cover everything... i hope!

Hi,

i'm looking for a good plasmacutter that works with plasmac.

What if the plasmacutter doesn't have an internal voltage divider ? Then the THCAD 300 would be good, but its out of stock everywhere. What is the alternative if I want to use THAD 5 oder 10 ? 

To buy a Proma voltage-divider or is there another professional-looking alternative ?
And maybe you can recommend a plasmacutter for plasmaC ?

Thanks.

Master is 2.10

So you would need to build from source or get a snapshot from the buildbot
to update to master.

BUT... you should be able to just replace the current pncconf pieces with these:

forum.linuxcnc.org/39-pncconf/56464-mesa...thcad-pncconf-screen

( Thanks kworm )


Another option is MesaCT which has had 7I95/7I95T support for a long time.

 

possible solution

forum.linuxcnc.org/39-pncconf/56464-mesa...thcad-pncconf-screen    

thnx kworm

after editing the PNCCONF according to kworm - update 
forum.linuxcnc.org/39-pncconf/56464-mesa...thcad-pncconf-screen

is possible to configure the step-dir spindle in 7i95T

I'm afraid ChatGPT will just be a time-sink here.

I suspect the easiest current path would be to make a pncconf  QTPlasmac/THCAD configuration
for a 7I95T (This requires updating to the very latest LinuxCNC master as 7I95T support was just added
about 1 week ago) This configuration will match as far as encoders, inputs, and outputs go (though will show
more inputs than the 7I97T has, so just don't use any inputs beyond input 15)

When creating the 7I95T configuration, setup step/dir axis.  and encoder feedback. This will create the
basic PID loop structure  required for changing over to the 7I97T PWM/analog axis configuration.

When this is done, you will have a step/dir configuration for a 7I95T and QTPlasmac/THCAD.
Next you will need to change the card name in the ini file to "7i97".

then the created hal file will need to be edited to change the PID feedback input from stepgen
position to encoder position and the PID output from stepgen velocity to PWM value.

There are also enables and some PWM setup needed. I can help with these when you get a basic
hal file setup. 

You can use this example of basic 7I97/7I97T PWM hal file setup:

 



 

Thank you, the wiring is making much more sense and less challenging now.  

Im using linuxcnc_2.9.4-amd64.hybrid.iso that I downloaded here.  It installed qtplasmac 2.9.  Is it recommended to install 2.10?

What is the easiest way to configure a 7i97t and a couple thcad2 for plasma?  I dont see 7i97t as an option in pncconf and in mesact there isnt an option for qtplasmac.

I asked chatgpt to create a quick ini for qtplasmac and a 7i97t and it came up with this pretty quick:
 

Si la resistencia es de 2,4 Mohm la medi para asegurar pero si le doy la vuelta a los cables del multimetro me da -145V en negativos 

todos esos valores son cortando el material 

If the external resistor value is correct (2.4M) that's not
possible. It may be that there is enough RFI/EMI that
the voltmeter is malfunctioning.

Ahora otra pregunta yo mido con un multimetro la salida del plasma la que va al thc lo mido en DC y me da mas de 600V que es en maximo de mi multimetro asi que no se cuanto exactamente, tengo una resistencia de 2,4 mohm en serie en el “negativo” si mido después de la resistencia me da 104V.

Que tengo que hacer?

Locales must be set to UTF-8 for LinuxCNC to work properly, be it for wizards or for some of the GUI's.
Probably should be mentioned in the docs, preferably at the very beginning, but not much of an issue from what i read on this forum.
Google "setting locale utf-8 debian", quite easy to do.
Hard to know if it works always for all the languages included.

Era el idioma muchísimas gracias por fin se solucionó 

Good catch. I just saw the 0 on the encoder port and assumed it was the same issue. I don't know about the translations either...I tried to take a quick look at the source but it immediately became clear I don't have enough understanding of it for it to be quick. Hopefully snowgoer540 can provide some guidance.