Re: Detectig fan failure - modes of failude
From: Spajky (Spajky##_at_volja.net)
Date: 09/15/04
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Date: Wed, 15 Sep 2004 23:07:54 +0200
On Wed, 15 Sep 2004 15:00:02 +0200, "SioL" <Sio_spam_L@same.net>
wrote:
>I'm designing a device with two convenient solder pads on the PCB
>providing LC filtered power to the fan to. This will be a smallish 1W
>12V fan, with only two connections (those are cheaper and I can't get
>the 3-pin version of 40x40x20 easily).
>
>It occurred to me that it might be great to have failure detection. Now
>it'd be easy if these were the 3-pin fans, but they're not. I wonder whether
>someone has some experience on modes of failure. Does it consistently
>draw more current, no current or should I watch for some AC ripple on
>supply line during normal operation, I'd expect there would be some and
>it'd stop if the fan stopped rotating.
>
>I'll possibly settle for a NTC if everything else fails, but I have some
>PCB real-estate left for other solutions.
check my site under electronics/fans-III how to monitor fan RPMs with
fans w/o 3rd wire; maybe you will get some idea later after exame of
the first stage of that circuitry ....
--
Regards, SPAJKY ®
& visit my site @ http://www.spajky.vze.com
"Tualatin OC-ed / BX-Slot1 / inaudible setup!"
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