基于PLC恒压供水变频操控系统设计(含CAD原理图,接线图)(任务书,论文设计说明书19000字,CAD图纸4张)
摘 要
随着社会经济的迅速发展。如图3-1所示,人们对供水质量和供水系统可靠性的要求不断提高。
下图为恒压供水泵站的示意图。另一种方案是数台电机陪一台变频器,以满足不同用水两的需求。系统有效地解决了传统供水方法中存在的问题,其余水泵共频运行,供水运行时,但是购买变频器的费用较高。
关键词：可编程序操控器, 变压变频调速, 恒压供水, PLC
PLC-BASED INVERTER CONTRL CONSTANT PRESSURE WATER SUPPLY SYSTEM DESIGN
ABSTRACT
With 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.
Pumps based on water flow and pump speed is directly proportional to the third power, to take 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 FarEasTone volume, constitute a closed-loop system, in accordance with changes in water consumption, the way to take PID regulator, the flow in the whole range of the continuous use of pump-conditioning pump frequency and adjust the combination of the classification, to achieve constant pressure water supply and effective energy conservation.
In this paper, based on water requirements, the design of a set by the PLC, frequency converter, Far EasTone pressure, multi-pump unit consisting of major equipment such as automatic frequency conversion constant pressure water supply, with automatic constant frequency operation, automatic frequency run and on-site features such as manual control. System to effectively solve the traditional way of water supply problems, and have a variety of auxiliary functions, and enhance the reliability of the system.
Paper analyzes the various ways water pump the state water supply and conversion conditions, analysis of the motor to change jobs by the frequency of the switching frequency operation and problems of the process. Given the state of the cycle to achieve an effective change of control of the electrical design and PLC control program design.
Also made a number of papers to enhance system reliability measures.
KEY WORDS: programmable logic controller, VVVF speed control, constant pressure water supply, PLC
恒压供水系统的基本构成
恒压供水泵站普通需设多台水泵及电机,具有全自动变频恒压运行、自动工频运行和现场手动操控等功能。
论文还提出了一些增强系统运行可靠性的措施。给出了实现有效状态循环转换操控的电气设计方案和PLC操控程序设计方案。
论文分析了多泵供水方法的各种供水状态及转换条件,在用水量少十开一台大电机肯定是浪费,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,图中压力传感器用于检测管网中的水压,变频器与电机见可以切换,利用远传压力表的水压反馈量,利用先进的自动化技术、操控技术以及通讯技术,分析了电机由变频转工频运行方法的切换过程及存在的问题。恒压供水的主要目标是保持管压网水呀的恒定,增强了系统的可靠性。
本论文依据供水要求,它们的功率必须足够的大,备用泵是必要的。当用水量大时,实现恒压供水且有效节能。
目 录
前 言 1
第1章 恒压供水原理及工艺 2
1.1 任务 2
1.2 工艺要求 2
1.3 系统的组成和基本工作原理 2
第2章 PLC概述 3
2.1 PLC组成 3
2.1.1 LC的输入 3
2.1.2 PLC的输出 3
2.1.3 PLC的操控机制 3
2.1.4 PLC的定义 5
2.1.5 PLC的特点 5
2.1.6 PLC的性能指标 6
2.1.7 PLC的分类 7
2.2 PLC工作原理 7
2.2.1 循环扫描 7
2.2.2 I/O响应时间 8
2.2.3 PLC中的存储器 9
第3章 系统硬件设计 10
3.1 恒压供水系统的基本构成 11
3.2 系统操控要求 13
3.3 操控系统的I/O点及地址分配 14
3.4 系统选型 17
3.5 PLC模拟量操控单元的配置以及应用 17
3.5.1 EM235模拟量工作单元性能指标 18
3.5.2 校准及配置 18
3.5.3 EM235的安装使用 18
3.5.4 EM235工作程序编制 18
3.5.5 电气操控系统原理图 20
第4章 系统程序设计 23
4.1 由“恒压”要求出发的工作泵组数目操控管理 23
4.2 泵组泵站泵组管理规范 23
4.3 程序的结果以及程序功能的实现 23
结 论 33
致谢 34
参考文献 35
外文资料翻译 36