Re: How do I check the MOSFET's in my stepper driver

Quite often, if the fuse protected some equipment by blowing, it will
blow again, and still save the equipment. If the equipment failed
and blew the fuse, the equipment will probably blow another fuse.
Either way, if another fuse blows, find out why. If a new fuse
doesn't blow, continue making chips. I do not understand the
paranoia.

(But then I dont understand a number of things)
Randy

--- In CAD_CAM_EDM_DRO@yahoogroups.com, Jon Elson <elson@p...> wrote:
> turbulatordude wrote:
>
> >
> >
> >
> >>Examin the fuse if it is glass body if the fuse wire has been
totaly
> >>vaperoised look for further faults if it is still there but
broken
> >>
> >>
> >replac
> >
> >
> >>it and continue.
> >>
> >>roger
> >>
> >>
> >
> >
> >Old wives tale or voice of experiance ?
> >
> >
> Especially with slow-blow types, the kind with the spring and wire
wound
> round a thing with solder on it, you can tell the sort of fault.
If it
> was a
> long-term overload, ie. 110 % or rating for 5 minutes, the solder
will
> appear cracked and grainy, and there will be little metal
vaporization.
> If it blew due to a dead short, the solder will be unmelted, but
the wire
> will have turned to a black deposit on the inside of the glass.
When you
> see the granular solder, and you know a motor was jammed or some
other
> reasonable cause for an overload, you free the jammed mechanism and
> replace the fuse. When you see the total vaporization of the fuse
wire,
> it is practically hopeless to just put another fuse in and pray!
>
> Jon