On Sunday 03 May 2009, Leslie Newell wrote:
>When it comes to shielding and noise prevention you can't have too much.
>Noise problems can be very difficult to track down. If would recommend
>screened cable but if you use unscreened, make sure everything else is
>really thoroughly screened. Also common mode chokes on the motor cables
>help a lot. Buy some large ferrite rings and wrap the drive output
>cables around them (without the screen). For steppers you will need two
>rings per drive. For each coil output , wrap both wires evenly round the
>ring, as close to the drive as possible. For DC servos you only need one
>ring per drive. These chokes smooth out some of the very high speed
>switching transients which are a major cause of electrical noise.
>
>I would also second the recommendation of starquad cable. It is great
>for small steppers and signal lines. It is also extremely flexible so it
>can be used in flexible cable trays. The only disadvantage is that the
>cores are usually not very well color coded.
>
>Les
And for those with color vision problems, that IS a major problem. ISTR mine
are two different shades of yellow and two different shades of blue. Use
yellows for one motor coil, and the blues for the other. But I have excellent
color vision. That also means I am becoming as the years slide by, more and
more handicapped at night. OTOH, those that fail every page in the color test
booklet the teachers use to screen kids, can also see that black cat, in a
coal bin, in the dark of the moon. Your night vision is _much_ better than
mine.
[...]
--
Cheers, Gene
"There are four boxes to be used in defense of liberty:
soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author)
The heart has its reasons which reason knows nothing of.
-- Blaise Pascal
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