PID loop-Retrofit old plasma cnc with air valve actuated z-axis low tech THC

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11 Dec 2021 11:37 #228868 by oeleboele

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11 Dec 2021 11:39 #228869 by tommylight
Search google for servo tuning detailed howto, the first result should be it.

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11 Dec 2021 11:40 - 11 Dec 2021 11:41 #228870 by phillc54
Last edit: 11 Dec 2021 11:41 by phillc54.

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11 Dec 2021 11:57 #228871 by oeleboele
Thanks, I saw your post servo-tuning, very nicely explained.

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11 Dec 2021 12:41 #228873 by oeleboele
The plasmac.state.out did the trick! Chill.

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13 Dec 2021 01:15 #228974 by rodw
Just a heads up that they still make Plasmas with a Z axis that skates along for HVAC thin sheet applications. but it sounds like you have got it going!
Very cool

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13 Dec 2021 08:36 - 13 Dec 2021 08:49 #228999 by oeleboele
Nice. It does indeed do a good job with pressing down warped sheet. But the drag does bother me a little ;)

But I'm also quite happy that I got i working, now I only need to fine tune the servos. I was a bit confused about that but now I understand that the drives close the velocity loop and that the position loop has to be closed in Linuxcnc.

What still confuses me is that I can only apply very low P value. Now I have P=2.5 but when I go higher the motor starts to vibrate quite heavily. Since the standard setting and a lot of the P values I read upon in other posts are way higher it feels a bit low to me. And I have the feeling the motors are not running at full speed with this settings. My FF1=0.03 at the moment.

It is all quite new to me so I don't have a feeling jet for what could be reasonable.

Can anybody tell me this could be in the right direction?
Last edit: 13 Dec 2021 08:49 by oeleboele.

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