Re: [CAD_CAM_EDM_DRO] Drive mfrs recommendations for MOTOR cables ?

Ballend: Though I have "been there, done that", I can only claim routine use
of common-sense, what I read in the stepper-makers' manuals, and "what
works". I have cobbled a number of "stepper-motor/PC controlled" CNC
machines over the last 30.

In a message dated 26-Apr-02 03:53:03 Central Daylight Time,
ballendo@... writes:

> 12VDC PS, 2A drive, 1A motor rating, 3 foot cable length?<< a pair of
> twisted-pairs of #20 copper, with or without a shield would do nicely.
> Even some "intercom cable" with four (or six!) conductors would do.
> Same with a 12 foot cable?<< Same. But I might tend to wanna use a
> foil/drain-wire shielded type, to preclude EMI from doing untoward things.
> Such is very hard to "find", when happening, particularly if intermittent!
>
>
> 36VDC PS, 2A drive, 2A motor rating, 10 foot cable length?<< Here, while
> perhaps a tad conservative, I'd want to use #18 twisted pairs. Same with
> 5 foot cable?<< Now, there, I might go with only #20. 20 foot cable?<<
> That long, and I'd kinda insist on shielded #18 twisted pairs (one shield
> for all pairs, not each pair indiv. shielded). 4A motor?<< Now, for 4
> amps, if less than 3 feet from driver-terminals, I might accept #18 if all
> "worked OK". However, for four or five feet or more, I'd want #16 for that
> current, as a TINY voltage-drop is a relatively high % of the "winding
> voltage" at low stepping-rates, or, at rest. #18 might work, but for that
> length, I'd sure wanna do some 'scope-testing of voltage-drops "at speeds".
>
> 60VDC PS, 5A drive, 4A motor rating, 18 foot cable length << Ditto.
> Same with 5 foot cable? 6A motor?<< Ditto.

Hope this is useful. Know: I am an ignernt ol' troll without much
eddikashun. But I have made stuff work, and as long as it is earning money
and the wire-insulation doesn't change shape or color, nor blow fuzes, I
don't worry too much about E.E. academics! (Good thing, too, cause my brain
couldn't handle it!)

Jan Rowland, Old Ugly Troll



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