Do you know how to control the signal of the DC cooling fan?

In our daily life and work, cooling fans are used in many places, especially DC cooling fans, which are more common. Speaking of DC cooling fans, it needs signals to be controlled. Do you know how the signals of DC cooling fans are controlled? Then let the cooling fan manufacturer Tongchi Automobile give you a detailed introduction, the details are as follows: u003cbru003e u003cbru003e u003cbru003e The speed measurement signal of a DC cooling fan is generally output from a three-lead plug. The yellow and black of the three leads are +12V power and ground respectively, and the other color line is the speed signal output line. u003cbru003e u003cbru003e u003cbru003e It should be noted that the third lead of some three-lead DC 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 DC fan motor. The alarm signal output from the DC fan circuit has two states: 'high level' and 'low level'. The meaning of the two levels is generally in accordance with the positive logic system. High level means 'fault' and low level. 'normal' u003cbru003e u003cbru003e u003cbru003e The speed signal output from the DC fan circuit is usually in the form of pulses. Each wave head means that the DC fan has rotated one circle. Such signals can be directly provided to the host through the data bus for display. The speed signal output by some DC fans is not the real speed of the DC fan, but a multiple of the speed. For example, every revolution generates 2, 4 or 6 pulses, which must be processed to form a real speed signal reflecting the DC fan. . If you want to distinguish whether the DC fan speed is the real speed or a certain multiple, you can use the tachometer to measure the actual speed, and then compare it with the displayed data. u003cbru003e u003cbru003e u003cbru003e u003cbru003e u003cbru003e u003cbru003e u003cbru003e 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, and the speed signal output can realize the fan Real-time monitoring of speed. Our Tongchi Automobile is a cooling fan manufacturer integrating production and sales, focusing on the development and production of cooling fans, axial fans, centrifugal fans, blowers; providing professional cooling system solutions, mainly acting as JAMICON cooling fans, SANYO DENKI cooling fans, and AVC cooling fans. fan. We also have our own brand: Jentech fans can provide you with a series of fans such as industrial cooling fans, AC cooling fans, and DC cooling fans.