wiring for thermo switch and fans

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radioflyer

Copper - Posts: 63

Joined: November 14, 2005

Location: United States

Posted: August 18, 2007 at 5:58 PM / IP Logged

I'm attempting to wire my Amp rack's cooling fans to a thermo-switch. They are currently using the 12v signal wires for the amps as power wires.

These are the fans i have (there are 4 in the rack 2 pusher/2 puller)

http://www.xoxide.com/ther60casfan.html

This is the controller i bought:

http://www.xoxide.com/copyiithfanc.html

I'm using this radioshack voltage regulator to step down the 12v source to the required 5v for the thermo switch

http://www.radioshack.com/product/index.jsp?productid=2062599&cp=&sr=1&origkw=voltage+regulator&kw=voltage+regulator&parentPage=search

The thermo switch was originally designed for a computer. From the controller there are two sets of wires

set1: red, black, black, yellow (which I assume to be 12v+; ground for fans, Ground for controller, 5v+)

Set2: yellow, black (which I assume to be fan + and fan - )

Does this sound right?

you can never have too much of a good thing

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i am an idiot

Platinum - Posts: 13,667

This member consistently provides reliable information

Joined: September 21, 2006

Location: Louisiana, United States

Posted: August 18, 2007 at 6:57 PM / IP Logged

What kind of current does the 5 volt supply of the controller require? The 7805 is good for 1 amp if it is mounted to a heat sink. They run really HOT. Also I noticed that the controller temperature range is 50 to 120 degrees. Is this going to be in the trunk of a car? If so you may need to rethink the top end of the range of the controller.

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radioflyer

Copper - Posts: 63

Joined: November 14, 2005

Location: United States

Posted: August 18, 2007 at 10:17 PM / IP Logged

the controller has only 2 amp output so I'd assume the input is less than that. The combined total draw of the fans at max is 0.68 amps. I have a hatchback so the air from the entire interior is circulating and I usually keep the interior around 75-80deg. The amps themselves are in a sealed amp rack with each amp having a pair of fans pusher/puller style.

you can never have too much of a good thing

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wiring for thermo switch and fans

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