本篇讲述的是PLC程序设计说明，该系统可实现自动自调节，在非高峰时段采用自动减压，面对故障时进行手动操作，缩短维修等待时间，确保日常供水顺畅。因此，对恒压供水系统进行频率控制，在提高供水效率和安全性的同时降低用水量，在实际生活中具有重要意义。本篇墨尔本论文代写文章由澳洲论文通AssignmentPass辅导网整理，供大家参考阅读。
The system can achieve automatic self-regulating, automatic decompression will be adopting during the off-peak period, and manual operation will be in progress when facing break down to shorten the waiting time for repair, thus to ensure the smooth supply of water daily. Therefore, conducting frequency control to the constant pressure water supply system has crucial meaning in real life practice since water supply efficiency and security are enhancedas well as it reduces the water consumption.
This project is to provide a design of PLC program to maintain a 24 hours constant pressure water supply to The Owasina Hall. Due to the information and professional knowledge needed for the design, researches and technical analysis on PLC, VFD, PID, adjustable speed pump, constant speed pump, auxiliary pump and redundant pump are necessary. We will also need to figure out what model of pumps would properly working with this system, therefore, the water demand, building height, pump ratings and the relationship between these three factors should be worked out. Finally, we will consider the logics needed for the possible system and figure out how to program it efficiently.
Statement of work
Upon completion of the project, the following list will be providing:
A completed PLC program with control strategies and bench demonstration.
A HMI that could offer graphic touch screen for operating data display, control adjustment, pump status readout and fault display.
A properly working pump station that includes adjustable speed pump, constant speed pump, auxiliary pump and redundant pump.
A Hand of Auto station that includes individual pump test, pump switched off and pump enabled for operation via PLC.
Assumption
Firstly, this project is assuming that The Owasina Hall prime contractor will allow us to design the water supply for the building. Secondly, we assume that this project will not interfere with other classes and projects using the same lab space. Lastly, we assume that our group members will be competent in their roles within our group.
Constraints
The major constraint we are dealing with is that the maximum system flow should not exceed 400USGPM. In addition, to satisfy the professional requirements, all of our designs should comply fully with CEC standards. Also as the fundamental of PLC system, our design should include CPU, digital input and output, analog input and output and communication modules.
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