基于可编程控制器的供水系统设计与实现

发布时间：2018-02-23 01:18

本文关键词： 供水系统西门子可编程控制器自动控制　出处：《云南大学》2013年硕士论文　论文类型：学位论文

【摘要】：随着社会经济的飞速发展,城市化建设进程不断加快,带来人们生活水平的不断提高；小区供水系统的建设是其中的一个重要方面,供水的可靠性、稳定性、经济性直接影响到小区住户的正常工作和生活。我们生活的小区尤其是许多老小区供水设备自动控制系统配置相对较低,机组的控制主要依赖值班人员的手动操作来控制完成,控制过程繁琐,而且手动控制无法实现对供水管网的压力和水位变化及时做出及时反应。于是选择一种符合用户要求、设计规范、安全、可靠经济的供水方式,给供水系统设计提出了新的要求。论文结合高层小区供水系统的要求,设计出一套基于德国西门子S7-200系列可编程控制器的供水系统。供水系统由可编程控制器、水泵机组、压力传感器、热继电器、液位传感器等构成。本设计通过控制水塔的液位来实现整个机组自动控制,具有先进性、可靠性、经济性及实用性等特点。本供水系统具有手动/自动运行两种模式。通过两种运行模式可分别实现对三台水泵进行控制。采用星——三角形降压启动实现对三相水泵电机的软启动,运行模式采用“二主一备”的方式。热继电器用于检测电机是否过载、短路故障,压力传感器检测相应水泵出水口压力；液位传感器检测水塔蓄水量；PLC、继电器、接触器控制水泵机组运行状态,共同达到供水要求。根据以上控制要求,进行系统总体控制方案设计及硬件设备选型(PLC选型,估算所需工/0点数,进行I/0模块选型),绘制系统硬件连接图(包括系统硬件配置图、I/0连接图,分配I/0点数,列出I/0分配表),熟练使用相关软件,设计程序梯形图,并对程序进行调试和修改。
[Abstract]:With the rapid development of social economy, the process of urbanization construction is accelerating, and the living standard of people is improving. The construction of water supply system in residential area is one of the important aspects, the reliability and stability of water supply, The economy directly affects the normal work and life of the residents in the residential area. In our residential area, especially in many old residential areas, the automatic control system of the water supply equipment is relatively low, and the control of the unit mainly depends on the manual operation of the personnel on duty to control the completion of the system. The control process is cumbersome, and manual control can not realize timely response to the pressure and water level change of the water supply network. New requirements for the design of water supply system are put forward. This paper designs a water supply system based on Siemens S7-200 series programmable controller, which is composed of programmable controller, pump unit, pressure sensor, thermal relay, etc. The design realizes the automatic control of the whole unit by controlling the liquid level of the water tower, which is advanced, reliable, economical and practical. The water supply system has two modes of manual and automatic operation. Through the two operation modes, three water pumps can be controlled separately. The operation mode is "two main and one standby". Thermal relay is used to detect whether the motor is overload, short circuit fault, pressure sensor detects the pressure of the pump outlet, and the liquid level sensor detects the water storage capacity of water tower. The contactor controls the running state of the pump unit to meet the water supply requirements. According to the above control requirements, the system overall control scheme design and hardware equipment selection / PLC selection are carried out, the required work / / 0 points are estimated, I / 0 module selection is carried out, and the system hardware connection diagram (including the system hardware configuration diagram / I / 0 connection diagram) is drawn. Assign I / 0 points, list the I / 0 distribution tables, be proficient in using related software, design ladder diagrams, and debug and modify the programs.
【学位授予单位】：云南大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TP332;TP273

【共引文献】