1. IR function, impulse current protection with soft start. When the power is turned on to supply the current to the cooling fan, the current gradually increases from zero until the cooling fan reaches the maximum speed and rated current. When the fan starts, the maximum impulse current is approximately equal to the running current when the fan is running freely, and the rated speed will be reached in 10 seconds.

2. As function, rotor locking protection and restart with limited current, automatic restart function can realize that when the fan blade is locked and then released, the fan will automatically restart. When the rotor is locked, the fan current will be reduced to zero, and the fan will automatically try to restart every five seconds.

3. MS function can modify different specifications according to customer requirements. When the fan is locked, the current is reduced to zero. Restart the fan, and then turn the power off and on again. This function is only used for some high-power types.

4. FG function, frequency generator or speed signal output. FG signal is an open collector output signal, which outputs a series of continuous square wave signals. For example, connect the collector output to a "pull-up" resistor, and connect the "pull-up" resistor to the power supply voltage compatible with the input level of the speed signal reading signal reading device The collector voltage can reach 72vdc, and the maximum current of collector motor is 5mA. It should be noted that the power supply of reading device must have the same grounding potential as the fan power supply.

5. Rd function, rotation detection function. Rd signal is an open collector output signal. The hardware of RD signal is the same as FG hardware mentioned above. When the fan is running, RD outputs "low level" signal, and when cooling fan stops, RD outputs "high level" signal.

6. The LD signal is a collector open circuit output signal. The hardware of LD signal is the same as the FG hardware. When the cooling fan operates normally, LD outputs "high level" signal. When the fan is running below 70% of the rated speed, LD outputs "low level". The reason for the slow speed may be product aging or insufficient power supply The connection mode of multi fan alarm is the same as that of RDB signal.

7. VPWM function, DC voltage signal speed regulation, this function is to use external variable DC voltage signal to control cooling fan speed