Re: [CAD_CAM_EDM_DRO] Re: L298 goes boom on my camtronics :(

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
> > .|_CMRy_|-|__|________|_|, <<<Under construction
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> Addresses:
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>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach 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 EXCEPTIONS........
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--
~ ~~ ~ ~ ~~ ~~____~,~~ ~~~~
\------/ |00|_[]_[]__||0 Tenwheeler
.|_CMRy_|-|__|________|_|, <<<Under construction
__________''oo__oo__---"0=0=0"=o[]o\\___________________________
-=Rich=-=Colorado Midland Railway=-=cmsteam@...=-
-------See my web site: <http://cmsteamer.homestead.com/> ------