Re: [CAD_CAM_EDM_DRO] +/- 15V Supply

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