The Fan Drive is an hydraulic system that activates the fan installed on the heat exchanger. This cooling system is more efficient than other traditional direct activation systems, as it can manage RPMs and, thus, the power absorbed by the fan
HOW THE FAN DRIVE SYSTEM WORKS
The rotation speed of the fan(s) is controlled by the amount of oil that passes through the hydraulic motor installed on the heat exchanger. The higher the flow the higher the rotation speed. The adjustment is made based on three system input temperature signals. The current for the proportional valve is modulated depending on the difference between actual temperature and the threshold set during the start-up stage.This system allows the fan to stay still and, thus, minimise the power absorbed by the system, especially during the stages in which operating temperatures are below the set parameters.