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Author Topic: Dither  (Read 1822 times)

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Dither
« on: August 10, 2012, 03:35:24 PM »
We get a lot of dither with an analog servo drive system using Mach 3.  When the system is idle, the DRO for the axis will dither by a few hundreds of a millimetre.  The output voltage to the drive is low, but present.  Is there any way to eliminate the dither.  It is like the PID is oscillating slightly.  Thanks.

Offline Hood

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Re: Dither
« Reply #1 on: August 10, 2012, 03:40:12 PM »
What controller are you using?
It will either be a tuning issue or a controller issue  and not a Mach issue.
Hood
Re: Dither
« Reply #2 on: August 10, 2012, 03:45:21 PM »
It is a DSPMC motion controller from Vital Systems.  The tuning is done on board this unit.  Do you think it is specific to this controller, or I have an issue with the PID parameters.

Offline Hood

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Re: Dither
« Reply #3 on: August 10, 2012, 03:47:06 PM »
If the tuning is done in the DSPMC then that is where the problem lies I would say.
Hood