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Homemade CNC Plasma - hypertherm, Mesa, gear drives, nema 34.
Homemade CNC Plasma - hypertherm, Mesa, gear drives, nema 34.
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02 Feb 2025 12:08 #320406
by PCW
Yes, this can't be right:
setp hm2_7i96.0.encoder.00.scale -1
It also looks almost like the velocity is random numbers
which suggests a wiring error or 7I96 encoder input 'A' not
jumpered for differential mode.
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02 Feb 2025 12:25 - 02 Feb 2025 12:30 #320408
by RNJFAB
Realised that T17 didn't have the input on the encoder set for arc ok, T18 does.
Double checked wiring, 99% sure it's all correct.
File Attachment:
File Name:
T18.hal
File Size:11 KB
File Attachment:
File Name:
T18.ini
File Size:5 KB
File Attachment:
File Name:
custom.hal
File Size:2 KB
Last edit: 02 Feb 2025 12:30 by RNJFAB.
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rodw
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02 Feb 2025 12:31 #320409
by rodw
Well, that looks right.
PCW, the encoder details seem correct as they have been listed in an earlier post
I don't think I can help further..
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02 Feb 2025 12:42 #320410
by rodw
assuming the plasma firmware is installed and it is a 7i96, The encoder pins are on TB2 as follows
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02 Feb 2025 13:18 #320412
by RNJFAB
Thanks Rod,
I have used 7/8 - enc, 9 - gnd, 12 - 5v+
Should i change to 6 for 5v+ ??
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02 Feb 2025 15:57 #320423
by PCW
No, 7I96 TB2 pin 12 is the correct 5V source.
What are the scaling factors that you used?
(there must be a missing hal file where plasma voltage scaling/offset is done)
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03 Feb 2025 12:05 #320492
by rodw
No, 7I96 TB2 pin 12 is the correct 5V source.
What are the scaling factors that you used?
(there must be a missing hal file where plasma voltage scaling/offset is done)
QTplasmac stores the THCAD scaling settings in the GUI as per the previous screen dump the OP shared.
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03 Feb 2025 20:24 #320533
by RNJFAB
I’m sure it’s something very simple that I have got wrong.
last night I realised that I don’t have an arc ok showing when the torch fires. Checked wiring and it’s all correct.
Cpc pin 12 goes to input 10 on the Mesa, pin 14 goes to common +.
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03 Feb 2025 20:29 - 03 Feb 2025 20:36 #320535
by PCW
The approximately +- 15000 encoder velocity numbers in the video
seem like pure noise. (and negative values should not even be possible)
I would first try jumpering the 'B' input as single ended and see if that helps
(also make sure nothing is wired to either 'B' input)
Do you get steady arc voltage readings when the plasma supply is off?
Last edit: 03 Feb 2025 20:36 by PCW.
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Thanks Rod,