Soft start function: When supplying power to the fan, the current gradually increases from zero until the fan reaches the speed and rated current. Starting is equal to the free running current, and the fan will reach the rated speed within the specified time (5) seconds.
Self start function: Lock protection, limit current restart, self start function is to ensure that the fan motor automatically restarts. In case of fan blade blockage and rotor locking, the fan current drops to zero, and the fan automatically restarts after 5 seconds.
FG speed detection function: equivalent to a frequency generator or output tachometer, this is an open collector output connected to a pull-up resistor and a compatible reading device input power voltage. This output provides a square wave signal (such as a - L input to a computer). The collector voltage may reach up to 72 volts DC and the collector current may reach 10 MAA. The power supply of the reading device must have the same grounding potential as the fan.
RD rotation detection function: This is a collector open circuit function similar to the FG hardware function. There are two situations: A type fan outputs a low level signal pin during operation, and stops running when the fan is blocked and outputs a high level signal. When the B-type fan is running, the signal pin output is at a high level, and when the fan is blocked, the output stops at a low level.
PWM pulse width control function: The PWM function can use frequency and high and low voltage levels to control the fan speed. By adjusting the duty cycle, the fan speed can be linearly controlled. PWM speed regulation is generally controlled by a four wire system, and currently most of the functions used are PWM+RD signal.
Automatic temperature control function: The speed of the fan is controlled by temperature, and different temperatures can correspond to different speeds.
