Joint2 following error, during homing switch reports on, 7i97

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08 Oct 2023 18:26 #282553 by smc.collins
I am going to post the config shortly, but I see the homing switch coming on in the hal config. any ideas ? just switched from a 7i77 to a 7i97 and the servos are working,. encoders are giving proper feedback. I basically grabbed the example 7i97 configuration file posted here and fixed the pin addressing and net assignments and it shows that the joint2-sw-in-home and joint2-sw-in-min or max tried both , do report the signal. 

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08 Oct 2023 20:27 #282558 by PCW
There was a bug in homing to index that was fixed fairly recently (Nov 2022) :

github.com/LinuxCNC/linuxcnc/commit/6bf6...afbf95c84f4fbb44f138

You might try updating to the latest


 

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08 Oct 2023 21:00 - 08 Oct 2023 21:01 #282560 by smc.collins
you see anything in that config that looks wrong ? this is a migration to a different card, and so far everything seems to work, I am also getting following errors on Y during deceleration. That is a fairly new install, but I will check the version and date on it 

Are there any things to need to be adjusted in the INI in regard to the change from the 7i77 to the 7i97 ? I already figured out the pin naming changes.
Last edit: 08 Oct 2023 21:01 by smc.collins.

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08 Oct 2023 21:04 - 08 Oct 2023 21:15 #282561 by PCW
The tuning probably needs work
(a 1.00 FF1 value only works if the joint velocity at 10V=10 IPS)

If you use a 1.00 FF1 value, you need to adjust the output scale
and limits to machine units/second at 10V
Last edit: 08 Oct 2023 21:15 by PCW.

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08 Oct 2023 21:35 - 08 Oct 2023 21:36 #282563 by smc.collins
yeah, it's a new servo on the Y, it's also different type than the other 2, so probably just needs tweaking.the dc drive burned up so in with a ac servo

anything catching the eyeballs for the home error on Z though ?
Last edit: 08 Oct 2023 21:36 by smc.collins.

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08 Oct 2023 21:56 #282565 by PCW
On Z it may be the index bug I related on a previous response (I'm not sure if this was fixed in 2.8)

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08 Oct 2023 22:25 #282567 by smc.collins
yeah, I get that but it was working prior, to changing to the 7i97,so I'm wondering if I have something setup wrong in the hal or 8ni.

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08 Oct 2023 22:28 #282569 by PCW
Might be, the index error only shows up  in certain circumstances
(when velocity at index detection  is less that 1 count/servo thread)

This is affected by distance from home to index, and homing speeds

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08 Oct 2023 23:11 #282572 by smc.collins
I've turned the homing speed down a lot, if that's the case, what can i do to speed up the io reporting from the 7i97 ?? i suspect this is part of my servo tuning issue as well.

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