Real-time monitoring of DC cooling fan signal
Release time:
2021-06-28
In our daily life and work, many central cooling fans, especially DC cooling fans, are becoming more and more common. Speaking of DC cooling fan, it is the demand signal to stop control, you know how to control the signal of DC cooling fan:
The speed measurement signal of the DC cooling fan is generally output from a three-lead plug. The yellow and black of the three leads are 12V power supply and ground respectively, and the other color line is the speed signal output line.
It should be noted that the third lead of some three-lead DC fans is not the speed signal output line, but the speed control signal line, through which the speed control signal is input to the DC fan motor. The alarm signal output from the DC fan circuit has two states: "high level" and "low level". The meaning represented by the two levels is generally in accordance with the positive logic system. The high level indicates "fault" and the low level indicates "normal". The speed signal output from the DC fan circuit is usually in pulse mode. Each wave head indicates that the DC fan rotates once, such a signal can be provided directly through the data bus should the host stop appearing. The speed signal output by some DC fans is not the true speed of the DC fan, but a multiple of the speed. For example, 2, 4 or 6 pulses are generated per revolution, which must be processed to form a true speed signal reflecting the DC fan. If you want to distinguish whether the DC fan speed is the real speed or a multiple, you can use the tachometer to measure the practical speed, and then compare it with the displayed data.
So far, there are two types of monitoring methods for the fan itself: alarm sensor and speed sensor. The alarm sensor can give an alarm signal when the fan speed is lower than a certain threshold value, and the speed signal output can complete the real-time monitoring of the fan speed.
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