Re: shielding for steppers

--- In CAD_CAM_EDM_DRO@y..., Jon Elson <elson@p...> wrote:
> cncnut@s... wrote:
>
> > Hi all,
> >
> > Been struggling with a little problem and hoping to get some
insight
> > from the group.
> >
> > It seem to me that only servos with encoder need shielding for the
> > cable to the motors. But do steppers need shielding. It appear to
be
> > unnecessary?
>
> It depends. If you are using encoders to check position of the
steppers,
> or if you are using limit switches at very low current, then you
may need
> shielding of the stepper cables. Some stepper drivers may be
sensitive
> to conducted EMI coming IN on the stepper motor cables, and may
> need shielding to keep external EMI sources from causing false
> operation. Plasma cutter and arc welding systems are the most
> likely candidates for such shielding needs, but some routers
especially
> with variable speed motors may also cause problems with the stepper
> drivers.
>
> Jon