One machine and multiple ground water pump control circuit

Many high-power equipment require circulating cooling water for cooling. When there are a large number of equipment that need to be cooled, a shared water pump can be installed and controlled by one machine and multiple places. That is, each operating point can start the pump independently and stop the pump independently. When any one of them is using water, It can also prevent other points from turning off the pump and cutting off water. Now take two control points as an example to illustrate the control principle. The circuit is shown in the figure. The main circuit and main control part are installed in the pump room. The main control circuit is equipped with ST and STP buttons for maintenance and testing. The main control line (pump room) and each use point (control point) are connected by three public control lines (dashed lines in the figure). When you need to add cooling equipment, you only need to extend the public line to the control panel at that point without changing the wiring at other points.