Re: Power supply for Servos - Energy dump and such - UR...

Dave,

Not true. Circuit #2 drains the cap once power is turned off until
there is less than 6V or so left. The cap powers its own discharge.

Mariss


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
<dave_mucha@y...> wrote:

>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Polaraligned"
> <polaraligned@o...> wrote:
> >
> >
> > >
> > > I thought the electronic circuit also drains the cap when the

AC

> > > power if off.
> > >
> > > Dave
> >
> > The PDF file for this circuit clearly says that it "Rapidly
> discharges
> > the main filter capacitor when AC power is removed from the

supply".

> > That is the reason I did not understand you using both the relay
> > circuit and the electronic circuit. A stop switch that locks in

the

> > "open"
> > position seems to be all you need with this circuit.
> >
> >
> > Scott
>
> I assume you figured out the two seperate uses of the electronic
> circuit.
>
> 1) short to ground any high voltages that come back from motors

that

> are being decelerated rapidly.
>
> 2) drain the power when the AC if switched off and E-stop
>
>
> There relay circuit is only for #2.
>
> Dave