Detailed explanation of the basic functions of DC fans

1. Auto Restart

When the fan is locked, the working current of the fan will be cut off automatically, and the fan will work in a low current state, so as to protect the fan from burning out due to high current; another function of Auto Restart: the fan automatically outputs a signal every certain time To start the fan, when the fan is not in the locked state, the fan will be restarted and run normally.

2. FG (Frequency Generator) signal/speed signal output

We often say square wave output. The function of this function is mainly to output a square wave signal from the inside of the fan, and the frequency of the signal represents the speed of the fan. Conventional four-pole fan: speed = FG frequency * 30. That is to say, the fan speed can be read by reading the FG signal.

3. RD (Ration Detector) function

The RD function is also what we often call the Alarm (alarm) signal. RD is low when the fan is running, and high when the fan is locked. By monitoring the level of the RD signal to determine whether the fan is running normally or locked.

4. Temperature control function

The ambient temperature of the fan is monitored through the thermistor, and the fan speed is appropriately adjusted according to the temperature to achieve the purpose of energy saving and noise reduction.

5. PMW (Pulse Width Modulation) speed control function

The so-called PWM refers to: pulse width modulation. It means that the frequency (period) of the pulse signal is constant, and the on-period and the off-period of the pulse signal are changed to change the fan speed to achieve the purpose of energy saving and noise reduction.

6. Voltage signal speed regulation

Input a variable voltage signal to change the speed of the fan to achieve the purpose of energy saving and noise reduction.

7. Special functions

Products can be customized according to customer’s special requirements (such as waterproof, dustproof, RD reverse, etc.).

Post time: Aug-28-2021