Andy,
I've been watching this thread and am wondering if this PID component
freeze could be used
on the pressbrake homing problem I've been having when I get the rapid
motion at index?
https://forum.linuxcnc.org/30-cnc-machines/42100-pressbrake-cnc-control-setup-questions?start=90#213554
Which PID pin would I use? I could attach my .hal file to the forum
topic if you need to see my PID settings.
Thanks,
Earl
On 10/20/2021 4:27 PM, andy pugh wrote:
On Tue, 19 Oct 2021 at 18:21, Rainer Stelzer<[email protected]> wrote:
So the PID saw a giant difference on the feedback and the command input
and acted accordingly with a giant output.
It was only for one servo-thread period, but depending on your PID
setup, this can cause a significant spike.
This is really a tricky issue, esp. when you are focused on PID tuning
and this kind of side effects come into play .
The LinuxCNC PID component has a pin to avoid this problem, it can be
connected to index-enable.
http://linuxcnc.org/docs/2.8/html/man/man9/pid.9.html
Which basically freezes the PID for one servo cycle when the index resets.
--
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**Earl Weaver
Email: [email protected]
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