文档介绍：基于S7-200PLC控制的变频恒压供水控制系统设计
摘要
近年来,随着我国国民经济的迅速发展,能源紧缺问题日益明显,因此应用变频调速技术来提高供水质量,降低能耗,在供水领域已得到越来越广泛的重视。变频恒压供水控制系统采用先进的变频调速、PLC等技术组成一闭环控制系统,用于民用建筑、生产用水,可使水泵出口压力保持恒定。恒压供水的基本控制策略是:采用可编程控制器(PLC)与变频调速装置构成控制系统,进行优化控制泵组的调速运行,并自动调整泵组的运行台数,完成供水压力的闭环控制,即根据实际设定水压自动调节水泵电机的转速和水泵的数量,自动补偿用水量的变化,以保证供水管网的压力保持在设定值,既可以满足生产供水要求,还可节约电能,使系统处于可靠工作状态,实现恒压供水。
关键字:水泵、变频器、恒压控制、PLC
Abstract
In recent years, with the rapid development of China's national economy, the energy shortage problem is ing increasingly apparent, so the application of VVVF technology to improve water quality, reduce energy consumption, in the field of water supply has been more and more attention. Inverter control constant pressure water supply system using advanced Frequency Control, PLC and other ponents of a closed-loop control system for civil construction, production water, can maintain a constant outlet pressure pumps. Constant pressure water supply is the basic control strategy: the use of programmable logic controller (PLC) and constitutes a frequency converter control system, optimized control of the governor to run pumps, and automatically adjusts the number of running pumps plete the water supply closed-loop control of pressure, that is, according to the actual settings automatically adjust water pressure pump motor speed and the number of pumps, pensation for changes in water consumption to ensure that the pressure of the water work to maintain the set value, both the water supply to meet the production requirements, but also to save power, the system is in reliable working condition, to achieve constant pressure water supply.
Key words: water pump ; inverter ;constant pressure control ; energy saving effects
目录
摘要 1
Abstract 2
目录 2
第一章前言 5
5
5
 逻辑电子电路控制方式 6
单片微机电路控制方式 6
带PID回路调节器和/或可编程序控制器(PLC)的控制方式 6
 新型变频调速供水设备 6
7
8
9
第二章方案的确定 11
11
11
11
1