Re: G220 (G201BP)

--- 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