Ye old *axis following error...
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02 Oct 2024 04:03 #311145
by M4MazakUser
Ye old *axis following error... was created by M4MazakUser
Ok, so I've been getting x or z axis following errors.
I can't see any errors from bios expeditions
Shielded cable used.
Using a pair of 8i20 cards for the servos.
Modified fanuc servo motors with a,b,z encoders - I do the thump on startup.
it seems to do errors at any speed fast/slow. I can't pin down what the cause is. Tried a multitude of servo tuning settings, still does the same. If it was a bios expedition, is there a way to track this, as running axis from a terminal dosent show any errors.
I can't see any errors from bios expeditions
Shielded cable used.
Using a pair of 8i20 cards for the servos.
Modified fanuc servo motors with a,b,z encoders - I do the thump on startup.
it seems to do errors at any speed fast/slow. I can't pin down what the cause is. Tried a multitude of servo tuning settings, still does the same. If it was a bios expedition, is there a way to track this, as running axis from a terminal dosent show any errors.
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02 Oct 2024 04:19 #311147
by PCW
Replied by PCW on topic Ye old *axis following error...
Can you provide a halscope plot of the velocity and following error?
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02 Oct 2024 04:36 #311148
by M4MazakUser
Replied by M4MazakUser on topic Ye old *axis following error...
I'll organise one, the error that occurs is usually during a rapid movement not possible to catch and map usually as it occurs randomly.
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02 Oct 2024 04:43 #311149
by PCW
Replied by PCW on topic Ye old *axis following error...
You can trigger halscope on a following error to capture the actual error
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03 Oct 2024 23:32 #311257
by M4MazakUser
Replied by M4MazakUser on topic Ye old *axis following error...
So, I was checking halscope and modded the "P" value higher - which gave less error. Then i found that It was running off more frequently. So, ive had too high a "P" value. The reason for this really is when I've looked up pid tuning of 8i20 cards you've reccomended setting as high a D value as is stable, but there's no range stated, - is 3 a high value? Is 500 a high value? I don't seem to get good position holding with a high d value as P generally ends up around 185, which you have said before is pretty much saturated.
I'm running a high thread rate 225000 off the top of my head.
I'm running a high thread rate 225000 off the top of my head.
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04 Oct 2024 01:42 #311259
by PCW
Replied by PCW on topic Ye old *axis following error...
I would add as much D term as possible until you reach instability
Have you added FF2? (the FF2 value depends on the system inertia)
Have you added FF2? (the FF2 value depends on the system inertia)
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