The pump system of the present disclosure includes, in an exemplary embodiment, a pump (10) for pumping liquid at a first level to a second level higher than the first level, a motor (20) for operating the pump, a motor A motor driving device (30) for supplying electric power to a motor, a measuring circuit (40) for monitoring electric power, a head defined by a difference between the first level and the second level, a rotational speed of the motor per unit time, and electric power. A storage device (60) and a control device (70) in which first data defining a relationship between the storage device (60) and second data defining a relationship between a discharge amount per predetermined time by a pump, a head, and power are stored. Is provided. The control device determines an estimated value of the head from the first data based on the measured value or the estimated value of the rotational speed and the monitored value of the electric power, and determines the estimated value of the head from the second data based on the estimated value of the head and the monitored value of the electric power. An estimated value of the ejection amount is determined, and the estimated value of the ejection amount is output.
展开▼
