Re: [CAD_CAM_EDM_DRO] ringing steppers

Can anyone tell me why I keep getting messages like this one - a repeat of a
previous message from someone other than the original sender but with no
additions or anything which would make it worth paying for the download. If
it only happened occasionally, I would not think twice about it but it seems
to happen with monotonous regularity, frequently several times a week.
Should there be more to this message which has somehow been sliced off in
transit or what?
Thanks,

Ian

--
Ian W. Wright
Sheffield UK

----- Original Message -----
From: Greg's Clock Shop <gregmc@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: 05 June 2000 14:22
Subject: Re: [CAD_CAM_EDM_DRO] ringing steppers


>
> ----- Original Message -----
> From: Jon Elson <jmelson@...>
> To: <CAD_CAM_EDM_DRO@egroups.com>
> Sent: Sunday, June 04, 2000 1:41 AM
> Subject: Re: [CAD_CAM_EDM_DRO] ringing steppers
>
>
> >
> >
> > Carl Bruce wrote:
> >
> > > My steppers "ring" when at rest. i am using a single supply for 3
> > > drivers. IF I disconnect two drivers the noise stops.
> > > Or ,if i use separate supplies it stops.
> > > Any suggestions?
> >
> > I assume these are 'chopper' type stepper drives? Probably some
> > circulating
> > current from the choppers pulsing. I would try putting something like a
> >
> > 100 uF capacitor with enough voltage rating for the DC supply across the
> >
> > input terminals of each stepper driver (from +DC supply to DC supply
> > Gnd).
> > This should absorb most of the current pulses, and prevent the drivers
> > from 'communicating' on the power lines.
> >
> > Jon
> >
> >
> > ------------------------------------------------------------------------
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> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the
discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
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