Re: Thoughts on PC Based Control Retrofit....Power Supply, advice?

--- In CAD_CAM_EDM_DRO@y..., "Marty Escarcega" <escarcega@h...> wrote:

> Ok, I have found some 44VCT 11A transformers for my series I
> retrofit. Coupled with a 35A 1000V Bridge Rectifier and a
> 14000MFD 75V Capacitor for each motor, do you folks think this
> should be a good power supply? By my calculations, I should have
> about 62VDC.
>
> Thoughts guys?
>
> Marty

Marty,

If you can, use a lower voltage rated bridge. The higher
a rectifier's V-rating, the higher it's "on" voltage-drop
is, and the hotter it runs. Also, the higher voltage
parts don't have quite as much surge capability. Speaking
of which, don't be surprised if you pop that bridge one
day, at the moment you turn the power on. It happens.
Be sure to put a fuse in the xformer circuit....

The cap is workable, but perhaps a bit light. About
double that would be right for 3 axes at 10 amps. Of
course, the bigger the cap, the bigger the surge through
the bridge...<g>

good luck,

Richard