On Thu, 25 Sep 2014, John Alexander Stewart wrote:

> Date: Thu, 25 Sep 2014 20:56:33 -0400
> From: John Alexander Stewart <ivatt...@gmail.com>
> Reply-To: "Enhanced Machine Controller (EMC)"
>     <emc-users@lists.sourceforge.net>
> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net>
> Subject: [Emc-users] 7i76 and spindle control
> 
> I have a G0704 mill (known "up here" as a King Canada KC20-VS) that is
> being CNC'd, with only one real issue cropping up.
>
> The spindle speed  control - original is a 4.7k pot, the spindle circuit
> board is a "copy" of a KBIC 120 style board.
>
> With the 4.7K pot in place, I measure 4.14v across the outer leads. With it
> removed, the circuit board shows about 11.9v. When I connect up to the
> 7i76, the voltage drops to 1.89v.  No matter what I do (not that I'm an
> expert in this config) I can't get anything other than 0.0v out of the 7i76
> spindle out.
>
> Does the 7i76 draw more current (twice as much, approx) as a 4.7k
> potentiometer?
>
> If so, I might have an "out":
>
> The KBIC board allows for "voltage following" with an external 0-7v supply
> leading to one of the  leads for the potentiometer, and one of the field
> wiring connections; maybe this board will act the same.
>
> Anyone know if what the 7i76 is doing is correct?
>
> Thanks - JohnS.


The 7I76 spindle analog out circuitry expects a regulated 5V to 12V supply, 
your supply has about 10K Ohms of series resistance so is not a suitable 
voltage source. You can use an isolated external supply of 5 to 12V



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Peter Wallace
Mesa Electronics

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