What are the 3 wires on a fan?
A 3-wire fan has power, ground, and a tachometric (“tach”) output, which provides a signal with frequency proportional to speed.
Why do computer cooling fans have 3 wires?
The third wire gives your computer a measure of control over that. It reports the speed of the fan back to the computer’s processors, which allows the motherboard to control the speed of the fan by raising the voltage – and speeding the fan – when the extra cooling is required, and lowering it when it’s not needed.
How do you wire a 4 pin CPU fan?
Note that Chassis and CPU fans may use either 3-pin or 4-pin power connectors….4-wire fans explained.
| PIN | WIRE COLOR | FUNCTION |
|---|---|---|
| 1 | Black | GND (0V) |
| 2 | Yellow | +12V |
| 3 | Green | Sense/Tach |
| 4 | Blue | Control/PWM |
How do you slow down an electric fan?
With a Shaded Pole motor, you can simply reduce the voltage, say with a light dimmer and the motor produces less torque, then with less torque the air friction on the fan blades causes it to slow down, which in turn moves less air.
What is the yellow wire for on a fan?
Yellow cable is for the fan speed determination. Because you have only one input (one fan), the controller doesn’t care about the second one.
How can I reduce the speed of my electric fan?
The speed of Fan can be slow down by simply by connecting a bulb or any other resistive load in series between the power supply and fan. In this method if the watt of connecting Load is increased then the speed of Fan is also increased.
Can you put a 4 pin fan into a 3 pin?
You can plug a 4-pin PWM fan connector into a 3-pin terminal on the motherboard without any problems. Without the fourth pin connected, the fan will just run at full speed.
Where do I connect RGB fan?
Use RGB Y-Cable to connect the fan and the motherboard. Please use RGB 4-Pin connector to an RGB header, and 4-pin fan connector to a fan header on the motherboard.