Computer Cooling Fan Wiring Diagram

It uses a 40 amp electric relay and electric fan sensor.

Computer cooling fan wiring diagram. The internal diagram of a typical two wire fan is as follows. 2 speed electric cooling fan wiring diagram duration. Start your wiring project by taking both of the positive wires from the fans and run them to the yellow wires on each relay tab 87. Suggested electric fan wiring diagrams suggested primary cooling fan single speed on off using 12 volt switching devices only for primary activation note.

Today s cooling fans are computer controlled and various methods are used to trigger these units into operation. Hayden flex a lite or perma cool brands can provide a 12 volt output when activated. Usually for more flexibility they have a male female 4 wire molex power connector. The cooling fan wiring diagram below is what we ve found to be the simplest and most reliable method.

The connector of a 2 wire fan has a red and a black cable. The red cable goes to the positive of the power supply vcc and. The red cable goes to the positive of the power supply and the black to the negative. You can use almost all standard 3 wire cooling fans with this adapter circuit.

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. However for optimum performance it may become necessary to slightly change the values of components c1 r4 and c2.