A cooling fan line the number of different what reason be
we common cooling fan is two lines, respectively is red and black is the power cord, the red line is positive, the black is negative, negative, generally referred to as the red is black but as users more and more high to the requirement of the cooling fan, cooling fan has promotion into three lines, four lines, we first discuss the cooling fan is the role of the third line.
the third and fourth line is the function of the cooling fan, signal lines, there is a kind of RD alarm signal, and is a kind of FG speed signal. RD alarm function is rotating detection function, and in a cooling fan runtime pins output low level signal, when the rotor block output high level; FG speed signal which is an open collector output link to a 'pull' on resistance and compatibility devices of input power supply voltage, the output is provided with a square wave signal is output frequency generator or tachometer.
and PWM control signals and temperature signals, the function of temperature control signal is applied, in the operation of the cooling fan, fan speed controlled by temperature, temperature can correspond to different speed; PWM speed regulating function can use frequency and high and low voltage level to control the fan speed, in this function, frequency from 30 hz - 30 KHZ, high level voltage range can be adjusted from 3 v to 10 v, low level range less than or equal to 0. 8 v, fan speed can be adjusted by 'duty cycle' to linear control fan speed, maximum speed until the fan.
thank you for reading, and do a cooling fan chi automotive professional, professional research and development production of miniature cooling fan, dc fan, centrifugal fan, fan cooling fan manufacturers, have our own r&d team and agent Japan San Ace mountain the cooling fan, JAMICON kaimei cooling fan, Taiwan AVC fan, welcome to come to consult, thank you!