The design of Haiwell C32S2R series PLC in the community direct drinking water constant pressure water supply control pump...
It is applied to the direct drinking water constant pressure water supply in the community, from the negative first floor of the community to the direct drinking water in each room of the entire 12-story building.
2. Application requirementsThe PLC control program controls the start-stop and timing switching of the water pump, and the inverter uses a PID instrument to control the output frequency to meet the requirements of constant pressure water supply. It can be realized that high-level users will not have low pressure when using water, and the water pumps can be switched to each other regularly to extend the service life of the water pumps.
Three, the solutionWrite the program according to the requirements. Because of the inverter, the contactor of the water pump cannot be stopped together with the inverter, and the inverter will report a fault. Therefore, use the TON command to delay the start of the pump and delay the stop, first stop the operation of the inverter , And then stop the contactor of the pump: use the cumulative command CTU to count the running time of the pump, and switch to another pump after a certain period of time. Haiwell PLC also provides a simulation function, which can debug the program when there is no PLC online.
Four, hardware configuration
Figure 1 Haiwell PLC C32S2R
Figure 2 Frequency conversion start procedure
Six, use experienceThe programming method of Haiwell PLC is similar to that of Siemens. It is easy to get started and has a simulation function. It is very convenient to use and supports domestic products!
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