Servo motors "buzzing" when not in motion
22 Jul 2010 12:32 #3452
by ichudov
Servo motors "buzzing" when not in motion was created by ichudov
Servo motors on my mill "buzz" slightly when the mill is on but not moving.
Is that because I need to do tuning?
Is that because I need to do tuning?
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22 Jul 2010 13:22 - 22 Jul 2010 13:23 #3455
by BigJohnT
Replied by BigJohnT on topic Re:Servo motors "buzzing" when not in motion
Yes.
On my lathe I set up a halscope for the following error with a trigger on vel or something like that. Then I increased the P till it would oscillate. Then slowly added I till it stopped then added more P then I till I didn't get any improvement in the following error. Then I added some FF1 or 2 I forget until the following error was as low as it would go when watching the trace on halscope.
Oh, and all that depends on your drives being properly set up...
John
On my lathe I set up a halscope for the following error with a trigger on vel or something like that. Then I increased the P till it would oscillate. Then slowly added I till it stopped then added more P then I till I didn't get any improvement in the following error. Then I added some FF1 or 2 I forget until the following error was as low as it would go when watching the trace on halscope.
Oh, and all that depends on your drives being properly set up...
John
Last edit: 22 Jul 2010 13:23 by BigJohnT.
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22 Jul 2010 14:03 #3457
by ichudov
Replied by ichudov on topic Re:Servo motors
Thanks. I will read about PID tuning and will do something.
My drives work in velocity mode, so the signal from EMC specifies the requested motor's velocity.
The drives have a variable gain and reference gain setting. I am not sure how they interplay with EMC's settings.
My drives work in velocity mode, so the signal from EMC specifies the requested motor's velocity.
The drives have a variable gain and reference gain setting. I am not sure how they interplay with EMC's settings.
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