At present, a large part of the pum

At present, a large part of the pump motor in the pump station is a non variable speed drive system. Originally, the water level was controlled manually, but it is difficult to accurately control the start and stop of the pump due to the inability to accurately position and monitor the water level every moment. Although the use of buoys or mechanical water level control devices has made some changes in the water supply situation. Most of the electric energy of the constant speed motor is consumed in the frequent starting and stopping of the water pump to adapt to the change of the water supply, which makes the motor work in the low efficiency area and shortens the service life of the motor; the frequent starting and stopping of the motor causes the high failure rate and poor reliability of the motor, which leads to the heavy workload of system maintenance and repair, and the serious waste of water resources. The traditional control method is backward. The system composed of PLC and inverter can solve the above problems. Frequency conversion technology with its superior performance in energy saving and constant pressure, coupled with pressure transmitter, achieves better control effect. Frequency converter "Self-protection" function, PLC simple control core software design, hardware interface is simple and feasible, high reliability, the whole system cost performance is very high.