Aideepen 4-channel DC 12V 3A 4-wire PWM fan speed controller with manual knob adjustment and switch for noise reduction in server chassis fans

ParameterOperating voltage: DC12V, can operate at voltages between 8-15V. Please ensure fan voltages are consistent. Fan current: Total maximum current for 4 fans is 3A. Please use with some margin. Circuit board self-consumption: Less than 20mA when no fans are connected. PWM signal mode: 5V 25KHZ PWM signal output range: 0%-100%Initial PWM adjustment range: 0%-60%Output interface type: 2510-4P offset, standard CPU and chassis fan connectors, pin pitch 2.54mmFunction description:Ensure correct polarity and power voltage. Connect the power supply and fan to use. The potentiometer is fully closed when turned counterclockwise and fully open when turned clockwise.The small adjustable resistor on the board (starting speed adjustment) is used to adjust the speed at the initial startup position. If the fan's speed changes in the opposite direction of the adjustment, it indicates the fan is a reverse-sequence fan. In this case, the (PF) setting point must be shorted with solder. Ensure the power is disconnected before performing this operation to prevent damage! After shorting, the PWM signal will change in the opposite direction of the adjustment, allowing the reverse-sequence fan to be adjusted in the forward direction.Important note: This is a four-wire PWM fan speed controller, which can only control 12V four-wire fans that support PWM speed control, such as many 12V four-wire case or CPU fans. It cannot control two- or three-wire fans!!!Package includeFan speed controller x1