3 Pin Computer Fan Wire Diagram

This demonstration shows the effects of.

3 pin computer fan wire diagram. The 3 pin senses fan rpm revolutions per minute. When using a 3 pin power connector with a 4 pin fan header the fan will always be on. Some fans may have a 4 pin connector but only 3 wires going into the back of the connector. Thus if someone tries to send pwm pulses to the coils of a 3 wire fan the same pulses will arrive at the controller.

A 4 pin pwm fan connector will have four square holes on the front and four wires entering the back. The 3 wire fan powers the hall sensor and the controller from the same line that the coils are powered. When no revolutions are sensed by the system an audio alarm or no system boot will occur warning the user or preventing proccessor overheating and burnout. With the help of this third wire a monitoring circuit can see the rotation.

Identifying fan type 3 pin or 4 pin pwm. This is still considered a 3 pin fan. Desktop board has a 4 pin fan header. If the connector fits the pins it ll work and you don t have to worry about the pin arrangement.

Proper fan connector placement is shown in the figures below. Convert a 3 pin 12v dc fan into a 12v 2 pin fan music. 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.

Fan has a 3 pin power connector. 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. In a 3 wire fan first two wires are the power supply wires of the fan. There is no fan control.

Fans with three pin connectors must be used on 3 pin cpu fan pinouts.