基于s7-200 PLC的恒压供水控制系统的设计

基于s7-200 PLC的恒压供水控制系统的设计(中文2900字,英文2000字)
关键词:PLC;恒压供水,变频调速
摘要
在高大建筑的使用PLC和变频器逻辑控制的恒压供水系统中,PLC用于逻辑控制而变频器用于压力调节。PLC和变频器是跟踪管内压力变化与给定压力之间的偏差的系统核心组件,通过PLC内部的PID运算功能,它可以控制变频和工频切换和自动控制的数量输入泵和马达的速度实现闭环自动调节供水电压变量.它可以实现控制水流同时保持恒压的目的。
The design of constant pressure water supply control system based on S7-200 PLC
Man rongXing , Jie zhang Xiaodong Zhang
Chinese He bei province Qin Huang Dao City Wen Yu Road No. 8, 021223@163.com Chinese He bei province Qin Huang Dao City Wen Yu Road No. 8, xue.hong. , Chinese He bei province Qin Huang Dao City Wen Yu Road No. 8
Key words
PLC; constant pressure water supply; frequency conversion speed regulation
Abstract:
IN tall buiding’s constant pressure water supply system with PLC and frequency converter logic control, PLC is used for logic control and frequency converter for pressure regulation . PLC and frequency converter which are the core components of the system track changes on the deviation of the pressure in a pipe with the given pressure,through the PLC internal PID operational, it can control variable frequency and power frequency switching and automatic control the number of inputting pumps and speed of the motor to realize closed loop automatic regulation voltage variable water supply.It can achieve the purpose of controlling the flow of water while maintaining constant pressure.