Real-time monitoring of the DC cooling fan signal
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News Center
Industry Trends
Release time:
2021-06-28
In our daily life and work, many devices rely on cooling fans—especially DC cooling fans—which are becoming increasingly common. Speaking of DC cooling fans, they require a signal to operate and be controlled. Do you know how the signal controls a DC cooling fan? Let’s have Jiangshan Cooling Fans give you a detailed introduction—here it is:
The speed-sensing signal of a DC cooling fan is typically output from a three-wire connector. Among the three wires, the yellow and black wires represent the +12V power supply and ground, respectively, while the wire of another color serves as the tachometer signal output.
It’s important to note that, in some three-wire DC fans, the third wire is not a tachometer signal output line—it’s actually a speed-control signal line. This wire transmits a speed-control signal to the DC fan motor, enabling speed regulation. The alarm signals output from the DC fan circuit can be either “high level” or “low level.” In standard positive logic systems, a high level typically indicates “fault,” while a low level indicates “normal operation.” The speed signals output from the DC fan circuit are usually in pulse format, with each pulse representing one complete rotation of the DC fan. Such signals can be directly transmitted via the data bus to the host computer for display. In some DC fans, the speed signals output are not actual fan speeds themselves but rather multiples of the true speed—for example, two, four, or six pulses per fan revolution. These signals must undergo processing before they can accurately reflect the DC fan’s actual rotational speed. If you want to determine whether the displayed speed is the actual fan speed or a multiple thereof, you can use a tachometer to measure the actual speed and then compare it with the data shown on the display.
Currently, there are two types of monitoring methods for the fan itself: alarm sensors and speed sensors. By using an alarm sensor, an alarm signal can be triggered when the fan speed falls below a certain threshold. Meanwhile, the speed signal output enables real-time monitoring of the fan’s rotational speed.
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