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Fan Wiring 101 ?

post #1 of 34
Thread Starter 
here's my dilemma...i have this fan controller http://www.tigerdirect.com/applicati...5&sku=V13-1104 and it has the standard 3 wire connectors : red,yellow,black. i am using Delta Model AFB1212VHE 120mm fans...these fans have only a 2 wire connection : red,black... so i wired the black/red from the fans to the black/red of the fan controller and nothing...fans do not come on...if i hard wire the fans to 12v molex connectors , they work so i know the fans are good. i have one other fan connected to the fan controller with the standard 3 wire connection and it works fine so the fan controller is working...what am i missing ?
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post #2 of 34
Black = Ground
Red = +5volts
Yellow = +12volts

so, assuming you have 12 volt fans, you need to wire the red and black of the 2-wire fans to the yellow and black.

the +5volts most likely isn't enough juice to even start the fans up.
post #3 of 34
Probably the fan controller can't output enough power to turn on the fan. That fan controller will only power up a fan that uses 16 watts or less. Most likely a powerful fan like a Delta will eat up more than that. I'll check how many watts that particular Delta fan needs.
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post #4 of 34
Quote:
Originally Posted by xtcrulez View Post
... so i wired the black/red from the fans to the black/red of the fan controller and nothing...
...what am i missing ?
The third, yellow wire. The red/black wires are power, the yellow is a signal (tachometer) wire. The fan controller doesn't know how fast the fans are running, so it can't "control" them
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post #5 of 34
That Delta is 0.6A, you'll be fine running it on that fan controller. Shadowmelder, I was thinking the same thing.
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post #6 of 34
Thread Starter 
double checked the specs of the fan controller and the fans and the controller can handle the fans....
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post #7 of 34
listen to the suggestions above...
    
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post #8 of 34
Thread Starter 
Quote:
The third, yellow wire. The red/black wires are power, the yellow is a signal (tachometer) wire. The fan controller doesn't know how fast the fans are running, so it can't "control" them
so without a yellow wire from the fans , the controller will not turn them on ? is there a way to hook 2 wire fans to a controller ?
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post #9 of 34
Delta's spec sheet says that the AFB1212VHE should operate between 4 and 13.4 volts with a draw of 0.6 amps (for a power consumption of 7.2 watts at 12 volts). Try CrazyJoe's suggestion first thought, that seems the most logical answer. I should have read more carefully.

Quote:
Originally Posted by xtcrulez View Post
so without a yellow wire from the fans , the controller will not turn them on ? is there a way to hook 2 wire fans to a controller ?
I don't think so. That fan controller controls the fans by altering the amount of voltage they receive; turn down the knob and the voltage goes down. What should the fan controller care what speed the fan is running at? Also, an 80mm fan running at, say, 2400RPM is not the same as an 120mm fan running 2400RPM. So having the fan controller know what speed the fan is running is useless unless the fan controller also knows what size fan is running. In this case, the name of 'fan controller' is a misnomer, it should be called a voltager regulator or something to that affect.
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post #10 of 34
Quote:
Originally Posted by xtcrulez View Post
so without a yellow wire from the fans , the controller will not turn them on ? is there a way to hook 2 wire fans to a controller ?
No. That fan controller uses two wires, the red and black to controll the amount of voltage through the fan. The yellow wire is a "sensor". It's so motherboards can read the rpm of the fan.
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