Servo Wiring and Tuning detailed How To example Mesa 7i77.

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20 Jul 2022 14:31 - 20 Jul 2022 14:32 #247851 by PCW
I would disable feedback (you can do this on a per joint basis by setting P, I, and D to 0)
and then set the output voltage by setting the PID bias parameter. (you can set this live with
the calibrate menus "Test" button)

This should allow you to:

1. Check the 7I77 output voltages (7I77 unconnected to drive)
2. Check the drive behaviour when set voltage are applied from the 7I77 (7I77 connected)
Last edit: 20 Jul 2022 14:32 by PCW.

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20 Jul 2022 15:02 #247854 by Monkey_boy
The maximum  voltage I can get out of the 7i77 is 0.096v (disconected) and 0.078 connected, it doesn`t matter what value is in the bias field there is no change in output voltage from the 7i77 when you press the test button.
Assuming linuxcnc is ok then to me its pointing to the 7i77. what do you think ??

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20 Jul 2022 16:33 #247858 by PCW
I would check

hm2_5i25.0.7i77.0.1.analogena
and
hm2_5i25.0.7i77.0.1.analogout0
with halshow

if analogena is true, analogout0 is +10 you have no real-time warnings
(and OUTPUT_SCALE is 10) and you don't get close to 10V on the 7I77
analog output 0 (7I77 TB5 pin 4 relative to TB5 pin 3) Then there is likely a
problem with the 7I77

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03 Aug 2022 16:02 #248944 by Monkey_boy
Hi I did the test with no result and after purchasing another 7i77 this cured the problem, now I`ve just got to learn servo tuning ??

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03 Aug 2022 21:06 #248972 by tommylight
The following user(s) said Thank You: JPL

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30 Oct 2022 15:23 #255445 by tommylight
Changed the title to reflect wiring since a lot of detail is about wiring and testing practices.

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30 Oct 2022 17:21 #255464 by JPL
Great! Was wondering where this went!

Now, can someone edit this older post to reflect the new url: forum.linuxcnc.org/10-advanced-configura...7i77?start=80#143677

(404)
The following user(s) said Thank You: tommylight

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04 Jan 2023 03:30 - 04 Jan 2023 09:30 #260891 by petmakris
Amazing how-to, thanks, great starting point for me.

I find this video with a basic overview of the tuning method to provide quite supplementary information

Ziegler-Nichols Method
Last edit: 04 Jan 2023 09:30 by petmakris.

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