Re: G220 (G201BP)

John,

You are correct. Fuses are a good thing all things considered; boards
don't char when they are used.

Mariss

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

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Mariss Freimanis"
> <mariss92705@y...> wrote:
> > Hi,
> >
> > Here's a progress update on the "bullet-proof" G201 project.
> >
> > The G220 will not have reverse voltage protection (too big
> > of a power loss to cover this rare miss-use.
>
> You mean it won't have a series diode, right?
>
> IMHO, it is still protected from reverse polarity,
> as long as the user provides a fuse.
>
> Apply reverse polarity and the FET free-wheeling
> diodes conduct. They should handle enough current
> to blow the fuse, while limiting the reverse voltage
> across the rest of the drive to a couple diode drops.
>
> Or am I missing something? Maybe the current sense
> resistor blows before the fuse?
>
> John Kasunich