Re: Resettable Fuses

Kevin:

You make an excellent point below! You have convinced
me that using standard fuses that burn out when the
coil current is exceeded is probably a better way to
go. I'll leave the resettable fuses alone.

I agree that turning off all phases is best, but for
now I just want something that will save me the hassle
of unsoldering an L298 when something goes wrong.

Thanks,

-Wayne

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Kevin Martin" <kpmartin@t...>
wrote:

>
> I can image an unintended consequence could be an injury.
> Once one of these has tripped, it esssentially becomes a
> switch that will turn a motor *on* at some random future
> time (i.e. when the PPTC cools enough). Not only (as some
> others have mentioned) would you want to turn off all
> the phases to a stepper (not just the overcurrent phase)
> and probably all the other axis steppers as well, you want
> them to *stay* off until manually reset.
> -Kevin Martin
>
> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Wayne C. Gramlich
>
> Has anybody had any experience placing any of the resetable
> fues (aka Polymer Positive Temperature Coefficeint -- PPTC)
> in line with their stepper motor coils to provide
> over-current protection. If so, did they work out? or
> where there unintended consequences?
>
> Any feedback on this issue would be appreciated.
>
> -Wayne
>