Re: [Emc-users] question on emi filters

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Nicklas,
I guess I didn't describe the setup as well as I could have.
The Gecko 320's are the source of the 20 khz pulses but the 320's are 
on the x and z axes and the noise is coming in on the spindle encoder lines.
The noise is there even when the 320's are NOT active and the x and z 
motors are not running at all. The noise stops only if I pull the 
error/enable connection and disable the drive.
The spindle encoder lines don't get very near the motor leads but I 
guess the motor leads could be radiating even when the motors are not 
running.  By the way it gets really bad if I jog either x or z axis.

I will disable all but one of the 320's and try some ferrite beads on 
the motor output wiring to see if that will help.  If it helps I can 
get enough beads to do them all.
It I guess I could also try some bypass caps right on the 320's at 
the 48 volt DC terminals.  I hadn't used any there yet because the 
320s are only about 6 wire inches from the output filters on the 
trans/rect/filter type supply/.

Thanks,
Cecil

At 04:11 AM 1/15/2017, you wrote:
> > > Has anyone else experienced the PWM switching noise of their drives
> > > getting into their signal level circuits?
> > > If so, how did you deal with it?
> > >
> > > Thanks,
> > > Cecil
> > >
> > Ahh, so I have company.  I've converted the switching motor psu's to
> > analog, but its pretty hard to block when the rediated noise is 12 volts
> > p-p at about 100 megahertz before you start building a star ground.
>
>Common mode filter on motor cables?
>
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