Qtplasmac Control cutting current Ampers plasma cutter

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24 Oct 2023 14:09 #283707 by Plasmanfm
I have a Lorch plasma cutter with 0 to 10 V. I can adjust the cutting current Ampers.
The voltage m 190 cs voltisch transferred during by the cutting process to the voltic display.Is this possible from the material list m190 ca ˋampersˋ to Input the pwm ?

king regarde and thankˋs
juergen

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24 Oct 2023 14:13 #283709 by tommylight
Moved to "PlasmaC" section.
What card/controller are you using?
Mesa 7i96S/7i76/7i76E/7i77 should be able to do that easily.

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24 Oct 2023 16:25 #283718 by Plasmanfm
Hallo tommylight
It is
Mesa7196S

King regade and thankˋs

Juergen

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24 Oct 2023 16:57 #283725 by tommylight
Mesa 7i96S has a 0-10V output for controlling spindles, and if you are sure your plasma takes 0-10V control, then consider it a spindle and control it like one. Plasma uses M3 to start the torch, so adding some S value corresponding to the current in amps should do exactly that.
Set the scaling for the spindle to correspond to amps your power source can do, say for 100A you would set the scaling to 100, then issue a M3 S65 if you want to cut at 65A.

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24 Oct 2023 21:15 #283753 by grijalvap
Remember 7I96S spindle output works as a digital potentiometer, so you need  10V power source  conected to TB2:
Positive  to TB2 pin 24
Gnd  to TB2 pin 22
Then the output value will be  TB2 Pin 23. 
 

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25 Oct 2023 08:39 #283775 by Plasmanfm
Thanks, I understand that, but how do I get the value from the material list m190 ca into the pwm?
What do I have to write where?

King regarde and thank‘s
Juergen

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25 Oct 2023 09:06 #283780 by phillc54
The cut amps from the materials parameter appears on two hal pins:
A float pin named qtplasmac.cut_amps-f
A s32 pin named qtplasmac.cut_amps-s
 
The following user(s) said Thank You: tommylight

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25 Oct 2023 11:48 #283795 by Plasmanfm
OK, I don't understand it all yet. Is there an example for this?


King regarde and thank´s
Juergen

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25 Oct 2023 12:36 #283797 by rodw
If you use the spindle speed as Tommy suggests, the S command will set the amps eg S 65 = 65 amps...
You might also be able to use M67/M68

The exciting thing you could experiment with is when current velocity is less then commanded velocity, eg in a velocity anti dive situation, would be to lock the height and reduce current to keep the voltage constant. (instead of alter height to keep voltage constant)
 

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25 Oct 2023 16:39 #283813 by grijalvap
No sure if the plasma response will be fast enoug, but for sure this would be an interesting test to do.
related to this it has been in my mind for long time if we can make a sort of plasma controller that emulate the Hyperterm modbus, then we can use the PMX485 component to talk to it, may be using a arduino. 

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