Frequency conversion controlling device for pump motor in central air-conditioner

The utility model relates to a frequency conversion control device used for pump motor of central air conditioning, comprising a frequency converter for refrigerating water pump motor, a frequency converter for cooling water pump motor and a programmed controller, which is characterized in that temperature sensors are arranged at the inlet and outlet of the refrigerating and the cooling water pump; the sensor signal of every temperature sensor is sampled and then sent to the programmed controller to analyze and process; the operation frequencies of the refrigerating and the cooling water pump motor are regulated by the frequency conversion commands outputted by the programmed controller via the frequency converter for the refrigerating water pump motor and the frequency converter for the cooling water pump motor. The utility model can perform the controlling of energy saving and speed regulating to the refrigerating and the cooling water pump motor based on the actual load of the water circulation system of the central air conditioning.