Re: [DML] Fan Fail Light Without Actual Fan Fail

["DMC Joe" <dmcjoe@xxxx>]

Martin,

Is this device being produced to compete with the Fanzilla?

DMC Joe
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----- Original Message -----
From: "Gutkowski" <webmaster@xxxx>
To: <dmcnews@xxxxxxxxxxxxxxx>
Sent: Tuesday, May 14, 2002 11:59 AM
Subject: Re: [DML] Fan Fail Light Without Actual Fan Fail


> Well, seeing as the subject came up :-)
>
> The problem with all the systems described EXCEPT the Fanzilla (to my
> knowledge - I have never seen one much less taken it apart) is that the
> fain fail light can only tell you when the voltage is going to the fans,
> or when the fans should be on, or when there's an imbalance between the
> fans. None of these solutions actually "know" when a fan is or is not
> drawing current when it should. The only way to do this efficiently is
> with a hall effect sensor - the original fan fail module did it this
> way, but only comparing one fan to the other, and it was appallingly made.
>
> I have been asked about the progress of my little project to make a fan
> sequencer and restore the fan-fail light functionality. I've been really
> busy the past month - 2 weeks filming a TV show in Glasgow (nothing to
> do with DeLoreans), and two joyful weeks of good weather with my
> DeLorean parked outside, so every evening was spent working on it, and
> not sweating over a hot soldering iron! However, as members of the
> dmc_electrics list know, I did produce a design. I found some truly
> fantastic IC's made by Philips which are BUK202-50X 20A high-side
> switches with status pin. They make it possible to build a completely
> solid-state fan sequencer from fewer than 20 components, which gives a
> genuine "fan fail" signal. Here's the design
>
> http://www.delorean.co.uk/electronics/fandelay2.jpg
>
> A drives the fan, B drives the fan-fail light. Two of these circuits
> need to be built, one per fan. R3 sets the delay. For those who are
> comfortable with data sheets, I've put it here
>
> http://www.cix.co.uk/~mgutkowski/20A_switch.pdf
>
> The BUK203 is exactly the same, but will only drive 4A and is cheaper,
> so ideal for the fan fail light. This device has open and short circuit
> detection, overheat protection (negating the need for a fuse) and under
> all these failure conditions, will light the fan-fail light.
>
> NB I have NOT tested this yet, but as the subject came up.... :-)
>
> Martin
> #1458
>
> DMC Joe wrote:
>
> >You said :
> > ".........Also why not run one additional accessory relay so the
> >light only indicates a "fail" condition when there really is no voltage
> >going to one of the fans?.."
> >
> >There is a device that does all of the above and more; it's called
> >"Fanzilla"!
> >
> >DMC Joe
> >Tech Information, DMC Joe Help Club, & Store
> >
>
>
>
>
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