Re: [CAD_CAM_EDM_DRO] Servo amp connections needed. Where should I go from here?

You need to hook up the tach to a tach on the motor, getting the
polarity right (ie, if it takes off swap the tach or motor wires) and
then try putting an analog command voltage into the input. There may
a pot you can tune for a slight offset, but you will really need to
find positive and negative supplies if you want to run it with a
pot... you ight be able to find the voltages in the drive somewhere
to borrow for testing purposes.

Chris

> I have a servo controller that I can't seem to find any information
> on.
>
> It is manufactured by Control Systems Research, Inc. Pittsburgh, PA.
>
> The model is NC121F.
>
> My question is in trying to get control of a servo motor with a
> single or stacked potentiometer.
> The controller has signal and tac inputs. I do not know what it is
> expecting at these inputs. My first guess was 0 to +10v at both
> terminals in relation to the common. I don't really have 0 to -10v so
> I am unaware if a null point could be reached this way.
> My mode of thought here is that the tac may output 6-7vdc/1000 rpm.
> If the inputs were tied together then they would track each other.
> Not so, or at least it did not prove out.
> When I touch either the tac input or the signal input with one wire
> or my fingers. The shaft slows and stutters . Possibly the stray ac
> signal I presume from my overhead lights. Using another power source,
> it was found to reverse the motor direction by connecting the signal
> lead to ground.
> Am I way off base in my mode of thought for bench testing this
> setup?
>
> DC
>
>
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-------------------------------------------------
Christopher C. Stratton
Engineer, Instrument Maker, and Horn Player
ccs@... 617 628 1062
http://web.mit.edu/~stratton/www/brassbuild.html