基于 PLC 变频调速恒压供水系统的设计摘 要随着社会经济的迅速进展，人们对供水质量和供水系统可靠性的要求不断提高。再加上目前能源紧缺，利用先进的自动化技术、控制技术以及通讯技术，设计高性能、高节能、能适应不同领域的恒压供水系统成为必定趋势。论文分析了实行变频调速方式实现恒压供水相对于传统的阀门控制恒压供水方式的节能机理。通过对变频器内置 PID 模块参数的预置，利用远传压力表的水压反馈量，构成闭环系统，根据用水量的变化实行 PID 调节方式，在全流量范围内利用变频泵的连续调节和工频泵的分级调节相结合，实现恒压供水且有效节能。依据供水要求，设计了一套由 PLC、变频器、远传压力表、多台水泵机组等主要设备构成的全自动变频恒压供水，具有全自动变频恒压运行、自动工频运行和现场手动控制等功能。关键词：可编程序控制器, 变压变频调速, 恒压供水, PLCPLC-BASED INVERTER CONTRL CONSTANT PRESSURE WATER SUPPLY SYSTEM DESIGN ABSTRACTWith the rapid socio-economic development of water quality and water supply systems to improve reliability requirements. In addition, the current energy shortage, the use of advanced automation technology, control technology and communication technology, the design of high performance, high energy, able to adapt to different areas of constant pressure water supply system has become an inevitable trend. Paper analyzes the way VVVF speed control constant pressure water supply compared with the traditional way of constant pressure water supply valve to control the energy-saving mechanism. Converter built by the preset parameters of PID module, using the hydraulic pressure gauge feedback Fareast one volume, constitute a closed-loop system, in accordance with changes in water consumption. In this paper, based on water requirements, the design of a set by the PLC, frequency converter, Far Easton pressure, multi-pump unit consisting of major equipment such as automatic frequency conversion constant pressure water supp...
