Re: L298 goes boom on my camtronics :(

Hey rich,
Yeah, its J4 on the single axis board. I was just wanting to put one
switch for all 4 axis so when flipped all 4 axis would be "free" (J8
for 3 axis, J4 for single axis). From what I understand the single
axis is/can be a stand alone but I am sure Dan can comment more on
this. The only thing I have noticed it lacks from the 3 axis board
are the 2 LEDs. I am not sure what the "DS1233" is but there is no
chip on the single axis board that matches those numbers. The only
thing I take off of the 3 axis board is +5 volts. The rest is
connected as the 3 axis board. You can connect it "through" the 3
axis but I did not understand at that time how to/ did not want to
burn anything out, so I hooked it up more "independently."

later
tauseef

--- In CAD_CAM_EDM_DRO@y..., RichD <cmsteam@s...> wrote:
> Taus,
> I don't understand why you are mixing J4 & J8.
> Or, is this J4 on the single axis board?
> Does the single board have it's own DS1233 or share the one on the
3 axis?
> RichD
>
> tauscnc wrote:
> >
> > Hey Rich,
> > no, I didn't unplug any stepper (did do that accidently once but
was
> > luckly!). I was using the "jumpers", J8 and J4 on the 3 axis and
> > single axis board and connecting a switch to it. Instead of
> > connecting 2 switches independently, I conneted one pin from J4 to
> > J8. Other pin of J4 to J8 and then a switch from J8. When "on" it
> > would connect J8 and J4 so technically all 4 axis should be free
> > wheeling. Guess I learned something! Don't connect them, use two
> > different switches.
> >
> > Wonder if I should also replace the L297 as afogassa found out.
Well
> > will wait for Dan and see what he says.
> >
> > Acutally, the more I think of it, I really don't need the 4th axis
> > since I don't have a 4 axis CAM program and I plug it into Y axis
> > anyway. Maybe I will just get another single axix one (fix the
other)
> > and use those 2 for the lathe. Well will see.
> >
> > thanks
> > tauseef
> >
> > --- In CAD_CAM_EDM_DRO@y..., RichD <cmsteam@s...> wrote:
> > > Taus,
> > > Arrrrrhhhhhhhgggg!
> > > You broke rule number one!
> > > NEVER disconnect stepper windings with drive power applied.
> > > The high voltage back EMF is a killer to the IC's.
> > > If you want to disable use the supplied AWO (all windings off)
> > feature.
> > > Jumper J8. That's what it's there for.
> > > OK?
> > > RichD
> > >
> > > tauscnc wrote:
> > > >
> > > > well well well, how are you? Me, smelling a little smoke :( I
was
> > > > connecting a simple switch to J4 and J8 so I can "free" my
motors
> > > > without having to turn off the main power on my Camtronics 2A
3
> > axis
> > > > board and single board all the time.
> > > >
> > > > Well I thought if I connect J4 (single axis) it frees the A
axis.
> > If
> > > > I connect J8, it frees XYZ axis. So what I did was to install
one
> > > > switch for both boards. I connected a wire from one pin of J4
to
> > one
> > > > pin on J8, other pin on J4 to the other pin on J8..I then
> > connected
> > > > two wires from J8 to a switch. Switch off and I pluged it in,
ZAP!
> > > >
> > > > my power fuse blew. I looked it all over and and undid the J4
> > wires,
> > > > ZAP 2nd time, I undid all of them ZAP 3rd time.
> > > >
> > > > I then spun the motors by hand and ALL 4 AXIS motors felt very
> > > > gritty,, like they where shorted out or had some "holding
power
> > on"
> > > > (remember no power is on)!
> > > >
> > > > I was so scared I pulled everything apart hoping it was the
power
> > > > supply but it works fine. Intersting is that NONE of the axis
> > fuses
> > > > blew, just the main power fuse.
> > > >
> > > > Looking around I noticed the L298N cracked on the single
board!!!!
> > > > Got real close and I could smell it a little. Y axes seems to
be
> > the
> > > > worst where the motor almost seems like it has holding power,
very
> > > > gritty to turn (each motor is free when not connected). Well I
> > hope
> > > > it's only the 4 L298 that need replacing. Found a price for
them
> > but
> > > > waiting on Dans responce first.
> > > >
> > > > Pic included of the single axis L298 if you care to share in
my
> > > > depression :(
> > > >
> > > > http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/Tauseef%
27s%
> > 20CNC%
> > > > 20Sherline%20/L298-Camtronicboom.JPG
> > > >
> > > > (its under files and "tauseef cnc sherline"
> > > >
> > > > tauseef
> > > >
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> > > --
> > > ~ ~~ ~ ~ ~~ ~~____~,~~ ~~~~
> > > \------/ |00|_[]_[]__||0 Tenwheeler
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> > OFF Topic POSTS: General Machining
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it if you have trouble.
> > http://www.metalworking.com/news_servers.html
> >
> > http://groups.yahoo.com/group/jobshophomeshop I consider this
as a sister site to the CCED group, as many of the same members are
there, for OT subjects, that are not allowed on the CCED list.
> >
> > NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY
POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO
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> --
> ~ ~~ ~ ~ ~~ ~~____~,~~ ~~~~
> \------/ |00|_[]_[]__||0 Tenwheeler
> .|_CMRy_|-|__|________|_|, <<<Under construction
> __________''oo__oo__---"0=0=0"=o[]o\\___________________________
> -=Rich=-=Colorado Midland Railway=-=cmsteam@s...=-
> -------See my web site: <http://cmsteamer.homestead.com/> ------