Re: Detectig fan failure - modes of failude
From: SioL (Sio_spam_L_at_same.net)
Date: 09/15/04
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Date: Wed, 15 Sep 2004 15:09:11 +0200
"Spehro Pefhany" <speffSNIP@interlogDOTyou.knowwhat> wrote in message
news:c3ggk09gb6goqo49pn4t3u4hajpnlvdb2q@4ax.com...
> On Wed, 15 Sep 2004 15:00:02 +0200, the renowned "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.
>
> Yes, that will work. It might be patented however.
Oh, well, most complicated solution. I hate it when the only
solution is the most complicated one. I'll probably go the NTC route.
Thanks,
SioL
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