Re: [CAD_CAM_EDM_DRO] +/- 15V Supply

If I understand the diode correctly, I would find some big diodes
and connect them like below:


-V d1 0V d2 +V
|------->|---------|--------------->|----------|
| | |
| no connection! |
| |
| |
| to motor - | to motor +

Where d1 and D2 are BIG diodes capable of resisting the
15A @ 18V, with with the "bands" of the diodes toward
the higher potential?

Thanks!

Jon Elson wrote:

>
> John Murphy wrote:
>
> > It's a rack mount transistor devices military supply, with
> > a variable 15 amp + output and a variable 15 amp minus output
> > (The outputs are variable from 0-18V and can be current limited).
> >
> > The supply seems to work great, but obviously I need somewhere between
> > 24 and 30 volts. Can I feed the -15 volt side of the supply to my
> > G320's negative supply terminal and the and the +15 volt terminal to the
> > +voltage side of my Geckodrives?
>
> Make sure the supply's common terminal is isolated from ground. If it
> is, then you should be in good shape. If not, you might be able to
> find a jumper somewhere (like on the back, a 2-screw terminal
> block that says something like "system ground to chassis ground
> jumper here") that can be removed to isolate the common from
> chassis.
>
> > I'm not paralleling this with any other supplies for motor drives
> > or anything special. Since there is 30 volts potential between
> > those terminals, I'd think that I could use the + & - terminals and
> > leave the "0" terminal alone.
>
> One thing to do when placing power supplies in series is to put
> a BIG diode across each supply, such that if one supply goes into
> current limit, it will not get a reverse voltage from the other supply.
>
> Jon
>
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