3 Pin Pc Fan Wiring Diagram

There is no fan control.

3 pin pc fan wiring diagram.

The three wire connectors are for small chassis fans with lower power consumption. Desktop board has a 4 pin fan header. The four wire connectors are for processor fans with higher power consumption. Fans and on board fan headers are backwards compatible.

A three wire fan connecting to a four pin fan header. Fan has a 3 pin power connector. There is no fan control. In a 3 wire fan first two wires are the power supply wires of the fan.

On these 4 wire computer fans i have found that some times they require an input to tell it how fast to spin so simply supplying power to 2 of the wires will not work if you have a 3 wire fan however you can supply power to the red and black and leave the white disconnected. If you need to install a 3 wire computer fan forget the wiring diagram. When using a 3 pin power connector with a 4 pin fan header the fan will always be on. Proper fan connector placement is shown in the figures below.

Of course all you need is the red and black wire to run your computer fan but if you didn t know what the extra wires are for this video may help you out. Fan has a 3 pin power connector. With the help of this third wire a monitoring circuit can see the rotation. When using a 3 pin power connector with a 4 pin fan header the fan will always be on.

There is no fan control. Most computer motherboards come with a standard connector for the fan and it only fits one way. The third wire comes directly from the output of the built in hall sensor chip generates output pulses during the fan rotation. Fans and on board fan headers are backwards compatible.

Proper fan connector placement is shown in the figures below.