AASD chinese ac servo's step/dir Oscilations
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20 Sep 2020 23:19 - 20 Sep 2020 23:21 #182988
by bevins
Replied by bevins on topic AASD chinese ac servo's step/dir Oscilations
Not sure this is anything because of the per division setting.
Last edit: 20 Sep 2020 23:21 by bevins.
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21 Sep 2020 00:11 #182993
by PCW
Replied by PCW on topic AASD chinese ac servo's step/dir Oscilations
Right so no oscillations there (peak error in step generation = 3 uinches or so)
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21 Sep 2020 10:42 #183116
by bevins
Replied by bevins on topic AASD chinese ac servo's step/dir Oscilations
with the drives enabled I can move the axis by hand and then it start oscillating.
Do I need more P gain?
Do I need more P gain?
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21 Sep 2020 12:23 #183123
by bevins
Replied by bevins on topic AASD chinese ac servo's step/dir Oscilations
AH!!!
Found the good manual that has the PIDS and adjustments. I should be ok now.
But for anyone with the Chinese AASD drives use this manual.
AASD manual with all parameters to tune
Found the good manual that has the PIDS and adjustments. I should be ok now.
But for anyone with the Chinese AASD drives use this manual.
AASD manual with all parameters to tune
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22 Sep 2020 00:33 #183207
by bevins
Replied by bevins on topic AASD chinese ac servo's step/dir Oscilations
What's your best guess why this is doping this. all motors are doing it.
I have been trying to get this tuned but keep having same issue as in the last video.
I can swap out the 7i76 for a 7i77 as a last resort. I have a 7i77, I would like to see if I can fix it though.
I have been trying to get this tuned but keep having same issue as in the last video.
I can swap out the 7i76 for a 7i77 as a last resort. I have a 7i77, I would like to see if I can fix it though.
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22 Sep 2020 01:10 #183217
by PCW
Replied by PCW on topic AASD chinese ac servo's step/dir Oscilations
Too much P or too little D in the drive would be my first guess
I would probably increase D until it gets too crunchy/buzzy
then back off about 50%.
I would probably increase D until it gets too crunchy/buzzy
then back off about 50%.
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22 Sep 2020 11:23 #183274
by bevins
yeah, well, they dont call it D in the manual. I dont know what parameters is what.
Replied by bevins on topic AASD chinese ac servo's step/dir Oscilations
Too much P or too little D in the drive would be my first guess
I would probably increase D until it gets too crunchy/buzzy
then back off about 50%.
yeah, well, they dont call it D in the manual. I dont know what parameters is what.
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22 Sep 2020 19:02 #183330
by bevins
What is a safe max for P. I am up to 1200 and I can push the axis until I get following error.
What would you call max P before I consider that not the problem?
Replied by bevins on topic AASD chinese ac servo's step/dir Oscilations
Too much P or too little D in the drive would be my first guess
I would probably increase D until it gets too crunchy/buzzy
then back off about 50%.
What is a safe max for P. I am up to 1200 and I can push the axis until I get following error.
What would you call max P before I consider that not the problem?
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22 Sep 2020 19:14 #183333
by bevins
Replied by bevins on topic AASD chinese ac servo's step/dir Oscilations
I am up to 8450 for P{ and it is not changing still soft. I can push it to f-error but I feel the resistance.
I found a parameter called: speed command source in speed control mode
I selected Motion controller analog voltage command, but it doesnt change anything when I am adding P in linuxcnc.
It does bypass the internal loop of the drive.
I found a parameter called: speed command source in speed control mode
I selected Motion controller analog voltage command, but it doesnt change anything when I am adding P in linuxcnc.
It does bypass the internal loop of the drive.
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22 Sep 2020 20:07 - 22 Sep 2020 20:07 #183339
by PCW
Replied by PCW on topic AASD chinese ac servo's step/dir Oscilations
Its not clear to me which parameters are which (and LinuxCNC doesnt need any PID changes,
this is all in the drive)
Does the drive come with any tuning software?
this is all in the drive)
Does the drive come with any tuning software?
Last edit: 22 Sep 2020 20:07 by PCW.
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