Cooling Fan in Controller Box

Hi All,
Last year I made up a controller box for my mega tree with E681 and 2 x DC power supplies.
I also mounted a cooling fan inside with a vent hole at bottom of box. The fan is always on.
It the a way of controlling the fan to turn on at a temperature when it is getting hot.
Thanks
Colin

 

Maybe a simple thermostat switch? Make sure you get a NO (normally open and not the NC (normally closed) type.

eBay example here.

That one is 40°C which sounds reasonable. Maybe 35°C would be better?

Simple wire it in series with the fan and attach (carefully) to power supply case.

 

Thanks David AVD
The thermostat switch is it 240Vac or can I use 12 VDC.
The fan I am using is 12VDC. Is this switch still ok to use.
Colin

 

Yeah, the switch is rated for higher voltage and current, but will work fine with your fan on 12V.

 

Thanks For your Help
David AVD
Colin

 

I bought 2 of these but have not tested yet. They are available at RS online. These units are variable speed and turn on with temperature (range 30C turns ON and ramps up to full speed when gets to 50C). They are 12 VDC and the spec shows they are very quite.

http://australia.rs-online.com/web/p/axial-fans/2637812/?searchTerm=263-7812&relevancy-data=636F3D3126696E3D4931384E525353746F636B4E756D6265724D504E266C753D656E266D6D3D6D61746368616C6C26706D3D5E5C647B337D5B5C732D2F255C2E2C5D5C647B332C347D2426706F3D313426736E3D592673743D52535F53544F434B5F4E554D424552267573743D3236332D373831322677633D4E4F4E4526

 

FYI

http://www.pccasegear.com/index.php?main_page=product_info&cPath=9_510&products_id=15179
http://www.computeronline.com.au/products_pic.php?C_ID=28&S_ID=254&PROD=32077
http://www.computeronline.com.au/products_pic.php?C_ID=28&S_ID=254&PROD=27004

These are $10 to $15. (AU)
"The revolutionary programmed temperature controller plays a key role. As shown in the chart, when case ambient air temperature is at safe level 0°C to 32°C, the ARCTIC F Pro TC fan speed remains at its lowest (500 rpm). This is to offer adequate ventilation at the lowest noise level possible. The ARCTIC F Pro TC is therefore completely inaudible (0.05 sone) at low temperatures – a much quieter level than generic TC fans.

However, once a gaming system is at load, the case ambient air temperature will go up speedily, and without any case fans, most likely it will rise above 40°C, an overheated level for most PC cases. High performance and instant cooling is vital at this stage in order to eliminate the risk of overheating and system instability.

The ARCTIC F Pro TC is programmed to achieve top fan speed at 38°C. The fan responses to the rise in temperature swiftly – within a critical 6°C range, the rpm of the ARCTIC F Pro TC fan increases from around 500 to its maximum of 2,000 rpm (the steep curve in the chart). Heat is dissipated from the case rapidly in order to achieve immediate cooling. As a result, the case air temperature remains at 38°C or below and thus the possibility of having a system failure can be eliminated."