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How Does A 3 Wire Computer Fan Work. The fan will function normally no matter type of fan header is used. A signal is sent via this third wire with a certain frequency that is proportional to the fan speed expressed in RPM revolutions per minute.
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The 3-wire fan powers the Hall sensor and the controller from the same line that the coils are powered. A three pin connector is basically power 512 volt ground and signal. With the fan spinning at 6000 RPM you would measure a 200 Hz pulse rate 6000 revmin 60 s 2 pulsesrev 200 pulsessec.
Two for powering the fan and one that carries the so-called Tach or tachometric signal in English.
There should be 0 V ground - black 12 V power supply - red. The second type has three wires. Find our new farming channel under Honey Creek Farm I needed to adapt a computer fan to a wall plug so I could use it in an egg incubator. A signal is sent via this third wire with a certain frequency that is proportional to the fan speed expressed in RPM revolutions per minute.
