AASD chinese ac servo's step/dir Oscilations

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6 years 1 month ago #182910 by bevins
I am trying to get these servos operating properly. I am using 7i92/7i76 and the drives are in step/dir.

When I move them with keyboard jogging they oscillate like crazy as shown in video.
When I jog them with drive control panel they don't. and they move great.

I know it seems like they need tuning but I think it may be linuxcnc and how it is setup.
I am using step+- and dir +- and tried 0,1,2 step type to no avail.

HAL File
Warning: Spoiler!


INI file
Warning: Spoiler!


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6 years 1 month ago #182932 by tommylight
Omit the
....maxerror.. =0.01
lines and see if that helps.

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6 years 1 month ago #182944 by PCW
Looks like a drive issue (oscillations > max_ferror)

You can check this by monitoring the following error

Note step-type should be 0 for step/dir drives
1 is CW/CCW, 2 is Quadrature

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6 years 1 month ago #182957 by bevins

tommylight wrote: Omit the
....maxerror.. =0.01
lines and see if that helps.


Yeah, did that in the hal and it does the same thing.

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6 years 1 month ago #182958 by bevins

PCW wrote: Looks like a drive issue (oscillations > max_ferror)

You can check this by monitoring the following error

Note step-type should be 0 for step/dir drives
1 is CW/CCW, 2 is Quadrature


I changed them back to step type 0. no change

I have worked on this for half the week and all weekend and cannot get these drives to be stable. I actually havent been able to change the way they act at all. These drives are fubar or I am not changing what needs to be change3d.

Here is the manual: AASD manuals

Use the AASD one. better translation.

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6 years 1 month ago #182968 by tommylight
Wiring according to page 20?
Any alarms going off ?
Looks like Pn002 has to be set to 2
Pn096 on page 61 has to be set to 0 for step/dir but on the wiring page it says it has to be 1 for step/dir ????

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6 years 1 month ago #182974 by bevins

tommylight wrote: Wiring according to page 20?
Any alarms going off ?
Looks like Pn002 has to be set to 2
Pn096 on page 61 has to be set to 0 for step/dir but on the wiring page it says it has to be 1 for step/dir ????


Pn002 is set to 2
I am using differential input mode. step +/Step- dir+/dir-

No alarms.....
I tried all three.... on Pn096

It says with differential max 500khz. Where is this changed?

I cant find any parameters that change the internal pid. I change the gain I think is P but doesn't do anything.

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6 years 1 month ago #182976 by PCW
Did you determine that its an internal vs external (LinuxCNC setup) issue?
You can do this by seeing if the following error shows the oscillations
If it does, this is a LinuxCNC setup issue, if not, its a drive tuning issue

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6 years 1 month ago #182979 by bevins

PCW wrote: Did you determine that its an internal vs external (LinuxCNC setup) issue?
You can do this by seeing if the following error shows the oscillations
If it does, this is a LinuxCNC setup issue, if not, its a drive tuning issue


I thought I had it nailed down to being linuxcnc setup because in jogging mode on the drive when I jog, it acts perfectly.

I will check hal scope for following error.

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6 years 1 month ago #182982 by bevins
Jogging from Drive panel works fine.

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