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ON 20030104@12:33:13 PM at page:
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JMN-EFP-786 James Newton replied to post 37625.4780324074

|Insert 'Mark, you're not supposed to let out the magic smoke! &lt;GRIN&gt; If you have a PIC programmer, you can buy the PIC's locally and use the code from the site. I'll make arrangements to send you a programmed chip if you can't. I don't think the 2n3055's will increase the ability of the unit to drive more, but Roman will comment further.' at: '<!-- 37625.4780324074 EOR -->'

<A TITLE="P-204.32.203.44" HREF="mailto:casteelm@frii.com">casteelm@frii.com</A> asks: <BLOCKQUOTE><A NAME="204.32.203.44">
</A> 
Hello, love the kit and it works flawlessly (till I started playing with it of course), anyway I'm building a "power feed" for a milling machine, and my motor is of course big, I didnt expect to see it draw so much current at 100Hz and it appears I may have fried the pic, its ultimately biasing Q2, Q3 continuously.  Can I buy a couple more pics? Also, I was thinking about adding on 2n3055's to up the capability, any negatives anyone can think of?     THANKS!   Mark</BLOCKQUOTE>




ON 20030104@2:22:25 PM at page:
http://www.piclist.com/techref/io/stepper/linistep/index.htm
RB-ezy-Q33 Roman  Black published post 37625.4780324074

<A TITLE="P-204.32.203.44" HREF="mailto:casteelm@frii.com">casteelm@frii.com</A> asks: <BLOCKQUOTE><A NAME="204.32.203.44">
</A> 
Hello, love the kit and it works flawlessly (till I started playing with it of course), anyway I'm building a "power feed" for a milling machine, and my motor is of course big, I didnt expect to see it draw so much current at 100Hz and it appears I may have fried the pic, its ultimately biasing Q2, Q3 continuously.  Can I buy a couple more pics? Also, I was thinking about adding on 2n3055's to up the capability, any negatives anyone can think of?     THANKS!   Mark</BLOCKQUOTE>
<!-- REPLY --><A HREF="/techref/member/JMN-EFP-786/index.htm">James Newton</A> replies: <I>Mark, you're not supposed to let out the magic smoke! &lt;GRIN&gt; If you have a PIC programmer, you can buy the PIC's locally and use the code from the site. I'll make arrangements to send you a programmed chip if you can't. I don't think the 2n3055's will increase the ability of the unit to drive more, but Roman will comment further.</I><!-- 37625.5230671296 EOR --><P>
|Delete 'P-' before: '<!-- 37625.4780324074 EOR -->' but after: '<A TITLE="'.

ON 20030105@10:47:34 AM at page:
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ON 20030105@11:20:17 AM at page:
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JMN-EFP-786 James Newton replied to post 37625.4780324074

|Insert 'Sorry to hear about your difficulties. :o)
<P>
The linistepper is fairly hard to blow up, even if you
short a motor connection it should still limit current to
the correct current limit anyway! Provided it is wired
correctly and has a big enough heatsink it should be
very reliable.
<P>
Possible reasons for blowing it up would be;
5v regulated supply was not 5v regulated
no heatsink (or too small) as the lini needs a big heatsink
connecting a psu supply voltage backwards etc
using too small value for current sense resistors
(the lowest value allowed is 0.67 ohms)
<P>
Anyway i'm willing to work you through the repair if you
can provide more information. :o)
<UL>
Please supply;
<LI>motor ratings, ohms amps, volts etc
<LI>psu ratings, volts amps etc
<LI>the values for the big current sense resistors
<LI>what you were doing when it blew
<LI>what type and size of heatsink you were using
<LI>type of regulated 5v supply you used
<LI>how long it ran for
<LI>any more info you can
</UL>
The PIC should not be blown unless you have blown one or
more output transistors. This would be hard as they are
100v 5A transistors and the kit is current limited at
exactly 1 amp, so there is a 5x safety margin!
<P>
You worry me by mentioning "large" motor and the idea
of using 2N3055's etc, the kit is sold as suitable for
1.5 amp motors and stepper motors draw exact current
which is usually written on their label.
It will run your large motor in perfect safety at 1A or
1.5A with the correct current sense resistors.
<P>
How much current were you trying to get? :o)
' at: '<!-- 37625.4780324074 EOR -->'

<A TITLE="204.32.203.44" HREF="mailto:casteelm@frii.com">casteelm@frii.com</A> asks: <BLOCKQUOTE><A NAME="204.32.203.44">
</A> 
Hello, love the kit and it works flawlessly (till I started playing with it of course), anyway I'm building a "power feed" for a milling machine, and my motor is of course big, I didnt expect to see it draw so much current at 100Hz and it appears I may have fried the pic, its ultimately biasing Q2, Q3 continuously.  Can I buy a couple more pics? Also, I was thinking about adding on 2n3055's to up the capability, any negatives anyone can think of?     THANKS!   Mark</BLOCKQUOTE>
<!-- REPLY --><A HREF="/techref/member/JMN-EFP-786/index.htm">James Newton</A> replies: <I>Mark, you're not supposed to let out the magic smoke! &lt;GRIN&gt; If you have a PIC programmer, you can buy the PIC's locally and use the code from the site. I'll make arrangements to send you a programmed chip if you can't. I don't think the 2n3055's will increase the ability of the unit to drive much more, see <A HREF="lini_tun.htm">for more information</A>.</I><!-- 37625.5230671296 EOR --><P>



ON 20030105@11:21:57 AM at page:
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ON 20030108@11:43:16 PM at page:
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ON 20030128@7:56:28 AM at page:
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JMN-EFP-786 James Newton Says

Thanx.......<BR>
I got home yesterday, and they were already there! BOY, that was fast!!! I<BR>
have got to say that they are good looking kits, and will serve the purpose<BR>
well, I'm sure.<BR>
   Thanx again......................jb