Re: Cooling fan question

[kim gross]

coinguy2 wrote:
> I am in the process of building a canopy and would like it fan cooled.
>
> I have 2 Fans marked DC12V 0.60A
> What would be the minimum AC Adaptor I would need to drive both.
>
>
> I hooked up one to a AC Adaptor marked 12VDC 300mA and it seemed to
> spin OK. Can I connect one or both to this without risk?
According to the specs on the fan your adapter does not have enough
current to run even one of the fans. You need an adapter that is 12vdc
and 1.2 amps to run both fans. Now this seems to be a very high current
draw for a fan though. If the 300ma adapter is driving one fan ok it
should be fine but I would not try pushing it to 2 fans. This would not
meet the specs of the fan and there could be a risk of failure to the
adapter but I really do not believe the fan could be drawing .6 amps
unless it is a very powerfull fan.

Kim
http://www.jensalt.com

[Marc Levenson]

Jose would know for sure, but I *believe* you can run several off that power
supply. The way I understand it, you've got 12v DC power to these fans, which
need .6 amps each.

What a minute, your power supply provides 300mA. I think that isn't enough even
for one.

Jose?

Marc


coinguy2 wrote:

> I am in the process of building a canopy and would like it fan cooled.
>
> I have 2 Fans marked DC12V 0.60A
> What would be the minimum AC Adaptor I would need to drive both.
>
> I hooked up one to a AC Adaptor marked 12VDC 300mA and it seemed to
> spin OK. Can I connect one or both to this without risk?

--
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[Richard Reynolds]

> Jose would know for sure, but I *believe* you can run several off that power
> supply. The way I understand it, you've got 12v DC power to these fans, which
> need .6 amps each.

hehe

> What a minute, your power supply provides 300mA. I think that isn't enough even
> for one.

nope its not, its only 1/2 the current required to run 1 fan, though current limiting DC
fans will not harm the fan, its just not efficient. a cut in 1/2 MIGHT even cause starting
problems, its also going to push the electronics in the converter which isnt good for the
converter.

> Marc

--
Richard Reynolds

[Satnik]

Use an old PC power supply. Fan cooled and more than enough amperage.

"coinguy2" > wrote in message
m...
> I am in the process of building a canopy and would like it fan cooled.
>
> I have 2 Fans marked DC12V 0.60A
> What would be the minimum AC Adaptor I would need to drive both.
>
>
> I hooked up one to a AC Adaptor marked 12VDC 300mA and it seemed to
> spin OK. Can I connect one or both to this without risk?