Subject:
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RE: External Power Port Problem..?
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Newsgroups:
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lugnet.robotics
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Date:
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Thu, 2 Dec 1999 00:18:51 GMT
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Original-From:
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Jim Thomas <JIM.THOMAS@TRWspamcake.COM>
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Viewed:
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684 times
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Yeah, they'll replace them just this once... You send them your 1.0 bricks
and they will replace them with 1.5 bricks. Problem solved -- no more
battery packs for you. Those Lego wall warts are current limited to less
than 1A (IIRC). Your battery pack will probably deliver 10x that! My
suggestion is that if you insist on using battery packs instead of the wall
wart then put a fuse on the line. If you find yourself blowing the fuses
then you'll know why.
Good luck,
JT
> -----Original Message-----
> From: Tilman Sporkert [mailto:tilman@activesw.com]
> Sent: Wednesday, December 01, 1999 4:07 PM
> To: lego-robotics@crynwr.com
> Subject: RE: External Power Port Problem..?
>
>
> Although I didn't see an "Use only Lego approved power
> supplies with the
> external power connector" in the manual, I believe Lego has
> no obligation to
> fix your RCX brick. The connector is for an external AC power
> pack, not a
> custom Lithium Ion DC battery pack. That they replace it for
> you is a nice
> gesture. They won't have this problem with new RCX bricks
> anymore, as they
> don't have an external power connector. If you get one of
> those, you're
> screwed.
>
> I suspect that a diode in the AC input rectifier circuit blew up. Your
> Lithium Ion battery pack can probably deliver much higher
> currents than the
> official Lego AC power pack. That can make a difference if
> you have all
> motors at full power and stalled or heavily loaded. And
> because your battery
> pack delivers DC, all the power goes through one pair of
> diodes. With AC, it
> alternates between two pairs, so each diode carries only half
> the power. If
> the diodes aren't dimensioned for this kind of usage, they
> will get warm,
> then hot, and eventually fail. I recall a message with a
> similar problem on
> this list some time ago. If that's the case, then you will be
> blowing up
> your replacement bricks sooner or later, too.
>
> Good luck!
>
> Tilman
>
>
>
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