On 11/02/2020 03:31 AM, andrew beck wrote:
Thanks Jon.
I am controlling a 1988 fanuc velocity spindle drive. And no Idea about
isolation. Not keen to try it lol. Really I just want a isolated 0-10v
virtual pot like the Mesa 7i76 has. Otherwise I might daisy chain in a
7i76 just for the spindle io. but that is such a waste lol.
Something I have used is an optocoupler to solve the
isolation issue, using a positive supply available on the
drive. I fed the input of the opto with a step input,
varying the step rate controlled the speed of the drive.
This was not very precise, but should be OK for a spindle.
It won't get you a reversible spindle without some other
solid state relays to control direction.
But, I'd be pretty sure the Fanuc drive is isolated.
Jon
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