Development Of Multi-Functional Water-Supply Controller

With the rapid economic development and the large increase of high-rise buildings, current city water supply network gradually reveals shortcomings. For Example, water hammer occurs when the pumps being switched; water supply pressure drops during the peak hours, which have brought us great inconvenience.To resolve the above issues, the author designed a water supply controller with C8051f020 and AT89S52 as the core. It achieves constant pressure water supply by controlling the frequency converter and five water pumps. The system consists of several modules, including power modules, switching modules, clock modules, data acquisition, data storage, motor control, serial communication, human-machine interface (parameter settings and data displaying) and the alarm system module, etc. It adopted anti-jamming design both in between the modules and in between the control chip and the module.Software design composed mainly of C8051f020 and 89S52, can achieve information exchange between the two controllers. The controller of water supply, with the actual pipe network pressure and the set pressure as the parameter, obtains the control command through the incremental PID algorithm; automatically adjusts the speed of pump motor through control of the inverter output frequency; achieves closed-loop pipe network water pressure regulation by controlling the number of running water pumps and inverter status in accordance with the size of water micro-controller, ultimately reaches the goal of constant pressure water supply. At the same time, the system also has fire-fighting function, monitor function, alarm, voltage and current detection, pump switch at the fixed time, manual function and Run Chart function, has strong ability to respond to emergencies.Finally, the experiment on hardware and the whole system proved that the system not only can make the controller to achieve the function of constant pressure water supply but also attain additional, such as sleeping functions. Due to the cost has been taken into consideration in the design process, the system is able to complete all the above functions with the minimum cost.