Re: Blown Gecko 340 Update

Hi Andy,
Did you post a picture of the G340 and wiring? Did anyone try my
snubber suggestion, or was it to far out there? Did you see big
inductive spikes on a scope? Just curious :-)

I know when I had a senior project in college that was a discrete PWM
motor drive, I had a 'nasty' motor that would ring massively and blew
my driver a few times. I learned a heck of alot about saving the H-
bridge from that and still want to revisit the design as I never
finished the over-current protection section at that time.

-Lee

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "andyolney" <andy@o...> wrote:
> I agree, have some worries about it, but as I built up hours with
no
> problems my confidence is increasing. Andy
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...>
wrote:
> >
> >
> > andyolney wrote:
> >
> > >Recap - I blew one of my Gecko G340 mosfets and was asking for
> help
> > >in finding out why.
> > >
> > >In the end I don't know the cause. Dan Mauch sent me a couple of
> > >mosfets and I sucessfully replaced the bad one, hooked it up and
> have
> > >several hours on the repaired Gecko and a first part done.
> > >
> > >
> > Glad you were able to fix it, but the question is whether it is
> going
> > to blow again? You've got it running, but the root cause has not
> been
> > found. That always leaves me feeling that I'm living on borrowed
> time.
> >
> > Jon