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Time：2022-04-08Views：0
At present, there are two types of monitoring methods for the DC fan itself: alarm sensor and speed sensor. Using the alarm sensor, an alarm signal can be given when the fan speed is lower than a certain threshold value, and the speed signal output can realize the real-time monitoring of the fan speed. monitor.
Although the variable frequency motor has high reliability, it is still a mechanical device. When used for a long time, its speed may drop or even stop, so it is good to monitor the running status of the fan in real time to find problems in time.
The alarm signal output from the fan circuit has two states: "high level" and "low level". The meanings represented by the two levels are generally in accordance with the positive logic system. The high level means "fault" and the "low level" means "normal".
The speed measurement signal of the DC fan is generally output from the three-lead plug. The yellow and black of the three leads of the DC fan are +12V power supply and grounding respectively, and the other color line is the speed signal output line. It should be noted that the third lead of some three-lead fans is not the speed measurement signal output line, but the speed control signal line, through which the speed control signal is input to the fan motor.
The speed signal output from the DC fan circuit is usually in the form of pulses. Each wave head indicates that the fan has rotated one circle. The signal of the DC fan can be directly provided to the host through the data bus for display. The speed signal output by some fans is not the real speed of the fan, but a multiple of the speed. For example, 2, 4 or 6 pulses are generated per revolution, which must be processed to form the true speed signal reflecting the fan. To tell if the fan speed is the real speed or a multiple, use the tachometer to measure the actual speed and compare it with the displayed data.
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