Axial Fan has a variety of functions for customers with different needs of the choice, I division through unremitting efforts to develop a series of superior performance, more unique function of products, the following look at the axial fan TPWM function. When this function is selected, the upper and lower limit temperature can be set. Below the lower limit temperature, the axial flow fan will keep the lowest speed operation. And Axial Flow Fan with CS function (constant speed) , IR function (impulse current protection) , CL function (current limit) . The NTC (temperature sensor) model is 104J (100K@25 °c) and the NTC is usually contained within the axial fan (either internal or external) . In addition, the TPWM will follow the additional identification bar code, such as: T 164020100A 500: "T" for the temperature speed, "16,40" is the most representative of the two temperature points, namely 16 °C, 40 °C, "20,100" represents the two most significant points of speed (20% of full speed, 100% of full speed) . To sum up, "164020100" means that when the ambient temperature of the axial flow fan (or TNC) is 16 °c, the rotational speed of the axial flow fan is 1000RPM, and when the ambient temperature of the axial flow fan (or TNC) is 40 °c, the rotational speed of the fan is 5000rpm. "A" means that the TPWM curve mode is mode a, and mode a is special in that when the ambient temperature is less than 16 °C, the fan runs at the lowest speed. The last number encoded, "500" , is the quotient of the maximum speed of the fan divided by 10, from which the maximum speed of the Fan (500 * 10 = 5000 RPM) can be calculated. Note: For the safety of the customer's equipment, if the temperature sensor (NTC) is open or shorted, the fan is running at full speed. The above is the function of the axial flow Fan TPWM introduced by Dong Xing Yue, we can customize according to the customer's special requirements, if you want to know more axial flow fan knowledge can click