Cool 3 Wire Fan Motor

This is ac power and not a dual capacitor so the terminal side does not matter black wire from the condenser fan motor to other side of power on the contactor t2.

3 wire fan motor. If the monitoring circuit sees no pulses fan off or weak pulses very low rpm then it raises an alarm to inform the operator user about the mishap. The circuit in the fan detects when the magnet in the motor passes a sensor and each time it pulls the sense wire to 0v. Yes 2 or 3 wire fans can be controlled using basic pwm.

A 4 wire fan has power ground a tach output and a pwm drive input. The third wire comes directly from the output of the built in hall sensor chip generates output pulses during the fan rotation. A 3 wire fan has power ground and a tachometric tach output which provides a signal with frequency proportional to speed.

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. Here s the 3 wire method. A quick guide for installing 3 wire condenser fan motors.

Since most oem motors only have 3 wires and most replacement condenser fan motors have 4 wires this creates a little confusion. In a 3 wire fan first two wires are the power supply wires of the fan. How to install 4 wire hvac ac fan motor to 3 wire unit.

The frequency of the output is twice the speed of the fan. Pwm in brief uses the relative width of pulses in a train of on off pulses to adjust the level of power applied to the motor. With the help of this third wire a monitoring circuit can see the rotation.

The common lead white and the brown with the white tracer contractor leads are wired into the same circuit so the brown with the white tracer can be cut off and insulated with a wire nut and electrical tape you don t need it.