Re: [CAD_CAM_EDM_DRO] Re: First note-Help

Mariss,

Yes, this stopped the random jumping, and when we received the motor and
drives back from you they worked great with the motor and encoder wires
around 2 ft long. When we went to about 10 feet, we started really having
problems again, and systematically narrowed it down to what I just described
to Tim and the first note.

However, I am not having any faults now, and I love those gecko servo
drives. The only time they fault now (I have not tested them exhaustively)
is when I drive them faster than my power supply can move the motor to keep
up. The motion is so smooth compared to steppers, that I never want to go
back, if there is any way I can avoid doing so.

Thanks, again,

Tom Eldredge

----- Original Message -----
From: <mariss92705@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, June 29, 2001 11:05 AM
Subject: [CAD_CAM_EDM_DRO] Re: First note-Help


> Tim,
>
> In helping Tom set up his motors with G340s, I noticed a problem with
> the encoders. It seems the US Digital encoder does not have any power
> supply bypass capacitors. This caused random "jumping" and
> positioning errors.
>
> The cure was to place a .1 uF multilayer ceramic capacitor across the
> encoder's +5VDC and GND lines, at the encoder itself. Problem
> disappeared entirely!
>
> Mariss
>
>
> --- In CAD_CAM_EDM_DRO@y..., Tim Goldstein <timg@k...> wrote:
> > How did you avoid electrical noise interfering with the encoder? I
> seem to
> > be having some problem with that and just got some National DS9638
> & DS9637
> > differential driver and receivers to eliminate the problem.
> Regarding the
> > 9638/9637 can any of you electronic gurus help me with a circuit
> diagram to
> > interface them with the encoders, the G320's, and an external power
> supply?
> > Don't want to tap the power off the G320 encoder power taps as I am
> sure the
> > current draw is beyond the Gecko spec.
> >
> > Tim
> > [Denver, CO]
>
>
>
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