3BSE018157R1 PM861AK01 Simple DIN rail connection

3BSE018157R1 PM861AK01 constant pressure water supply system principle is shown in Fig. 1, which mainly consists of PLC, frequency converter, PID regulator, TC time controller, pressure sensor, liquid level sensor, power control line, and 4 pumps. The user understands and controls the operation of the system through the indicator lights and buttons on the panel of the control cabinet and the changeover switch.

3BSE018157R1 PM861AK01 pressure sensor installed on the outlet pipe network, the outlet pressure signal is turned into a 4-20mA standard signal and sent to the PID regulator, which compares with the given pressure parameter after arithmetic and comes up with an adjusting parameter to be sent to the frequency inverter, which controls the rotating speed of the pumps and regulates the water supply of the system. The speed of the pump is controlled by the frequency converter to regulate the water supply of the system, so that the pressure in the pipe network of the water supply system is maintained at the given pressure; when the water consumption exceeds the water supply of one pump, the pump is added through the PLC controller. According to the size of water consumption by the PLC control of the number of working pumps and frequency converter pump speed regulation, to achieve constant pressure water supply. When the water supply load changes, the voltage and frequency of the input motor also changes, which constitutes a closed-loop control system based on the set pressure.

3BSE018157R1 PM861AK01 At the same time, the system is equipped with a time controller and a PID controller, so that it has a timed pump change operation function (i.e., the clock control function, which is realized by the time controller) and a dual working pressure setting function (realized by the PID controller and the time controller). In addition, the system is equipped with a variety of protection functions, especially hardware/software backup pump function, fully guarantee the timely maintenance of the pump and the normal water supply of the system.