Adjust the water temperature of the cooler by controlling the rotational speed of the cooling system motor.Finally, the function of controlling the temperature of the cooling system is achieved.The control unit has a self-diagnosis function. Then, the cooling control system can reliably record and store the information about the operation status and faults, and can exchange the data with the portable PC through the standard maintenance port (Ethernet).The control unit has the fault recording function.The fault information shall include the fault code, the time of fault generation and disappearance, the number of repeated occurrence, etc.TRDP real-time communication system is adopted.