On Sun, 09 Oct 2016 08:23:49 -0500, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote:

fired this volley in
:

I THINK he was talking about remoting the speed pot on the VFD. A
relatively simple 3 conductor cable on the "voltage devider".
Possible for sure, but a bit of a pain.

I never read any indications that he was talking about multi-phase
motors. OF COURSE it can be done that way, but all the discussion here
was about chopper-controlled single-phase induction motors.

I said VFD...and most VFDs can be remoted up to 500 feet, particularly
if using the 0-10 analog input for speed control. RS-485 will work
even farther.

That sort doesn't particularly like that sort of control _anyway_, unless
they were designed for high-slip operation (like, say, ceiling fan
motors).

But, again: A properly designed ball mill requires NO speed control over
a fairly wide range of jar sizes.

LLoyd

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