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

Hi,

I agree overheating will cause oscillation but the size of the heat-sink
would make this unlikely. Mine had a blown tant which had no side in it. I
spoke to a power-supply designer and was told this a common design fault on
power-supplies which didn't have enough capacitance across the rails. The
oscillation only shows up under certain conditions and once started it will
destroy something.

Regards,

Terry

> > 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
>
> Overheating will also cause regulators to appear to oscillate. They
> turn on, heat up,
> shut down, cool, turn back on, etc.