Re: [CAD_CAM_EDM_DRO] voltage based servo controller ?

turbulatordude wrote:

> Hi all,
>
> I picked up a servo controller today and while trying to find out more
> data on how to connect it, I found out is is not a step and direction
> based unit, but a voltage control based unit.
>
> There is a pixie interface that is discontinued. the Pixie used to
> turn the step and direction into the inputs for this unit.
>
> Anyone know what it was originally used for ? was it the first tyep
> of control before step and direction became the rage ?

Yes, this is most likely a velocity servo amp. It uses a
tachometer on the motor to match actual speed to the voltage
command. These are still used today, and there must be millions
of machines out there using them. Step and direction may be the
rage for home shop systems, but not as common in
industrial-class machine tools. The most common arrangement is
a +/- 10 V command voltage proportional to 100% speed.

Jon