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How to undervolt this fan?

M

munkle

[H]F Junkie
Joined
Jan 16, 2005
Messages
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I have this fan that I pulled from a dell. http://www.newegg.com/Product/Product.aspx?Item=N82E16835706028

It had some funky dell connector so I cut that off and matched up the colors of the wires and soldered them to a 3pin connector. It works fine at full speed (loud and blows a ton of air) but using a fan controller to slow it down just causes it to go funky. It twitches or speeds up and slows down over and over. It had an extra blue wire I am assuming for the PWM, is that needed and could that because the fan to go funky?
 
munkle said:
I have this fan that I pulled from a dell. http://www.newegg.com/Product/Product.aspx?Item=N82E16835706028

It had some funky dell connector so I cut that off and matched up the colors of the wires and soldered them to a 3pin connector. It works fine at full speed (loud and blows a ton of air) but using a fan controller to slow it down just causes it to go funky. It twitches or speeds up and slows down over and over. It had an extra blue wire I am assuming for the PWM, is that needed and could that because the fan to go funky?
Click to expand...

yes that would be the pwm wire and is more then likely why its going nuts.. when using a 3 wire connector + fan controller you are controlling the fan speed through the voltage.
 
Since I don't know how it's wired or what the fan controller setting is, I'm going to take a stab and suggest that you might be turning the fan below the motor's operating voltage. It's also possible that there's a loose connector or maybe improper wiring.

I have never done proprietary to 3 pin, I've always taken it to a 4 pin molex connector, and I've never needed a fan controller before but I have rewired it to be 7v or even 5v depending on the fan that I used. Here's a pretty good website that shows how to wire it up either direct or with a switch. http://www.silentpcreview.com/article6-page1.html
 
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