We have all used cooling fans, but how much do you know about it? Today, the cooling fan manufacturer will introduce the functions of the cooling fan, and see how much you know!

1. IR function, with soft-start surge current protection. When the power is turned on to supply current to the cooling fan, the current gradually increases from zero to the top until the cooling fan reaches a high speed and rated current. The large impulse current when the fan starts is approximately equal to the running current when the fan is running freely, and it will reach the rated speed within 10 seconds.

2. AS function, rotor lock protection and restart with limited current, automatic restart function can realize 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 will automatically try to restart the fan every five seconds.

3. MS function, different specifications can be modified according to customer needs, 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 computers. Kind.

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 terminal to a "pull up" resistor, And connect this "pull-up" resistor to a power supply voltage compatible with the input terminal of the speed signal reading signal reading device. The large collector voltage can reach 72VDC, and the larger collector current is 5mA. Note that The power supply of the reading device must have the same ground 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 the FG hardware mentioned above. When the fan is running, RD outputs a "low level" signal. RD outputs a "high level" signal when the fan stops.

6. RDb function, life detection function, LD signal is an open-collector output signal. The hardware of LD signal is the same as the FG hardware improved above. When the cooling fan is running normally, LD outputs a "high level" signal. When the running speed is lower than 70% of the rated speed, the LD outputs "low level". The slow speed may be caused by the aging of the product or insufficient power supply. The LD signal multi-fan alarm wiring method is the same as the RDb signal.

7. VPWM function, DC voltage signal speed regulation, this function uses an external variable DC voltage signal to control the speed of the cooling fan