Re: [DML] A couple of exciting new products available at DCS 06 in Pheasant Run

["joekuchan" <josephkuchan@xxxxxxxxxxx>]

Hi Ryan,

No, unfortunately the module does not detect lack of draw. I realize
that such a failure mode is possible, and it is posible to detect
that, but in the interests of lower cost, smaller size, and reduced
time to design (I wanted a product ready for DCS '06) I did not
include such a feature. If I find some time I'll see if I can come up
with a reasonable solution for that issue. 

I believe that it is slightly more likely that a failure would be one
that results in an over current situation that will blow a fuse, as
opposed to one where the fan circuit is completely open. NBut having
said that, I agree that it would be a nice enhancement to build a
controller that can detect either kind of failure.

Best regards,
Joe

--- In dmcnews@xxxxxxxxxxxxxxx, "Ryan Wright" <ryanpwright@...> wrote:
>
> I have a question about the fan fail product:
> 
> >  Joe Cool also handles the fan fail light in an intelligent manner. It
> >  has separate internal fuses for each fan circuit. If a defect in the
> >  fans or their wiring results in either or both of the internal fuses
> >  blowing, the fan fail light will be turned on.
> 
> Is it capable of detecting a total lack of draw and lighting the fan
> fail lamp as well? One of my concerns about previous fan fail products
> was the very real possibility of a fan failing in a manner that does
> not blow the fuse. If the circuit were simply open, the fan module
> would just go on providing power and not inform the driver. I'd like
> to find a module that would additionally trigger the fan fail light if
> the draw on one or both fans drops below a reasonable threshold. I'm a
> little surprised that, given the number of fan fail alternatives that
> have been offered over the years, none of them have incorporated this
> feature.
> 
> I'm hoping your module does; if so, I'll likely buy one.
> 
> -Ryan
>








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