There are two water pumps in the system, which are driven by M1 and M2 motors respectively and controlled by KM1, KM2 and KM3 contactors. The system uses S7-300 PLC (cpu 313c, 16 input points, 16 output points), triangular frequency converter FR-A740, pressure sensor, float type liquid level switch and other control equipment. The pressure sensor of the water supply system is installed at the outlet of the pipe network, and the water level monitoring float level switch sensor of the storage tank is installed on the top of the storage tank.
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