Re: gecko's and voltage

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Chris Baugher
<cbaugher_yahoo@b...> wrote:

> On Sat, 5 Jul 2003, Mariss Freimanis wrote:
>
> > Other ramifications (read expensive) would be a linear voltage
> > regulator would no longer be usable because of excessive

dissipation.

> > A switching type regulator and its attendant circuitry would have

to

> > be used.
>
> I think this is why the Rutex drives use a split supply. It is a

bit

> annoying though having to have a separate supply.
>
> > The drives are tested at 100VDC and come apart above 108VDC. It is
> > not good practice to rate equipment at 100% of the component max
> > ratings. We use 80% as the de-rating value for reliability.
>
> Interesting. The Rutex drives are rated at 100V and they use

IRF540N's.

> Basically the same except for higher current. The instructions do

say

> that the motor supply voltage should never exceed 100V though.
>
> So does that 80% derating mean that the Gecko's are safe to run

with a no

> load power supply voltage of 80V?
>
> C|

It would seem that back EMF would become a factor. The Xylotex
drives are rated for 35 volts max, with a warning approaching some
immeadiate destruction at 35.01 volts.

Dave

( could read between the lines on Mariss's post that folks are now
going to push envleope and try to edge up the published limit.)