Re: [CAD_CAM_EDM_DRO] Parker Digiplan Stepper Drive, Help Wanted

Hi,

I have these drives on my Harrison lathe. One was faulty and I traced the
fault to the voltage regulator. They seem to have neglected design pricipals
when the boards were first designed and not put enough capacitance between
power and ground causing the reg to osolate. They are not helpful, even
refusing to identify the output transistors. They charge half the price of a
new unit just to look at your old one. I found my faulty components by
testing everything till I found the problem.

Regards,

Terry

> Dear All,
>
> I am having trouble with an old Parker PKS Digiplan Stepper Motor
> Driver, Model CD20. There is a fault on the main board causing one of
> the output H switches to overheat.
>
> Parker were not very helpful in that they do not make wiring diagrams
> available to anyone, not even for this 20 year old unit.
>
> Does anybody have additional faultfinding documents for this unit (I
> do have the user manual, which is useless for this purpose).
>
> Alternatively, does anyone have such a drive going spare? Or even an
> alternative unit? Must be step/direction input, 3 Amps per phase, and
> be able to handle a 64 Volts motor supply.
>
> Any help appreciated.
>
> Kind regards,
> Thomas.