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

The weird thing is, I really haven't done anything to blow the fuse.
The machine has been powered up, but I've been working on a
completely different section (VFD/Power end) and the motor was just
sitting there for a few weeks. Went to test the new setup and the Z
axis didn't work.

Fuse is an opaque ceramic Littlefuse Pico fuse.

The thing that ticks me off is I have an in-line 8amp fuse and the
internal one was a 10amp. The internal one was a fast-blow, I'll
have to check what I used for the in-line and make sure it's the same
or faster I guess?

I thought that for this application, a slower fuse would have made
sense for the internal one to allow current in-rush, but maybe that's
not the case with a stepper driver?

Jeff

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "r_.hampson@t..."
<r_.hampson@t...> wrote:

>
> Did you blow the fuse or did the fuse blow!!
>
> If you caused a short circuit and blew the fuse it is possible that

you

> have damaged one of the transistors (fet), but it is also possible

that the

> fuse wire got tired and just could not take it any more and simply

gave up,

> in which case replace it and continue.
>
> 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
>
>
> Original Message:
> -----------------
> From: washcomp jeff@w...
> Date: Wed, 23 Feb 2005 12:15:59 -0000
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] How do I check the MOSFET's in my

stepper driver

>
>
>
>
> I blew a fuse in my API CMD-260 stepper driver. Before I put it

back

> into my CNC mill, I'd like to make sure that one of the MOSFET's
> didn't blow and cause the fuse to go. How would I test them

without

> de-soldering? (I didn't find any consistancy in resistances with

my

> ohm meter, probably because of external circuitry or

interconnection

> between them). There are ten of them in there.
>
> Or should I just change the fuse and hope for the best?
>
> Jeff
>
>
>
>
>
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