Water supply variable-frequency constant-pressure control system

The utility model discloses a water supply variable-frequency constant-pressure control system, and belongs to the technical field of water supply. The control system comprises a PLC (Programmable Logic Controller) control system, a variable frequency controller, a variable frequency contactor, a plurality of motors, power frequency contactors, a teletransmission pressure gauge, a digital display meter and a set pressure digital display meter, the number of the power frequency contactors corresponds to that of the motors, the variable frequency controller and the PLC control system are connected in series to form a loop, and the motors are connected in parallel to the PLC control system through the power frequency contactors. The variable frequency controller is connected in parallel with the plurality of power frequency contactors through a variable frequency contactor; the teletransmission pressure gauge is connected to the variable frequency controller, and the digital display meter is connected with the t