基于S7-200PLC的中央空調(diào)冷媒水溫度控制系統(tǒng)設(shè)計(jì)

摘   要

空調(diào)對國民經(jīng)濟(jì)各部門的發(fā)展和對人民物質(zhì)文化生活水平的提高有著重要的作用，這不僅意味著受控的溫度環(huán)境對各種工業(yè)生產(chǎn)過程的穩(wěn)定運(yùn)行和保證產(chǎn)品的質(zhì)量和數(shù)量有重要作用，而且對提高勞動(dòng)生產(chǎn)率，保證人體健康，創(chuàng)造舒適的工作和生活環(huán)境有著重要的意義。
該系統(tǒng)以PLC為控制核心，由兩臺75KW變頻器分別驅(qū)動(dòng)三臺電動(dòng)機(jī)，PLC根據(jù)冷媒水溫度反饋信號，從而改變與冷媒水的熱量交換量，對冷媒水的溫度進(jìn)行控制，可以實(shí)現(xiàn)對空調(diào)水系統(tǒng)溫度的自動(dòng)控制，使其達(dá)到空調(diào)系統(tǒng)所要求的溫度。
近年來，隨著微電子技術(shù)，傳感器技術(shù)以及控制理論的發(fā)展，空調(diào)技術(shù)和性能得到了很大進(jìn)步，空調(diào)開始向大功率，多功能，無氟，節(jié)能，智能化，人性化方向發(fā)展，因此傳統(tǒng)的空調(diào)難以滿足現(xiàn)代的發(fā)展要求。本次畢業(yè)設(shè)計(jì)采用S7-200PLC作為中央控制單元，對中央制冷空調(diào)的冷媒水溫度控制系統(tǒng)進(jìn)行設(shè)計(jì)。

關(guān)鍵詞:PLC  冷媒水  變頻控制  

Abstract
The air conditioning has the vital role to various branches and sectors of a national economy's development and to the people's matter culture living standard enhancement, this not only meant the temperature environment which controls to each industrial production process stable movement and the guarantee product quality and the quantity has the vital role, moreover to enhances the labor productivity, guaranteed the human body health, creates the comfortable work and the living conditions has vital significance □this system take PLC as the control core, separately actuates three Taiwan Telegraphic Transmission motive by two 75KW frequency changer, PLC to act according to the cold intermediary water temperature feedback signal, thus the change and Leng Meishui interchange of heat quantity, carries on the control to Leng Meishui temperature, May realize to the room temperature automatic control, enables it to achieve the air-conditioning system requests the temperature recent years, along with the micro electron technology, the sensor technology as well as the control theory development, the air conditioning technology and the performance obtained has been very greatly progressive, the air conditioning started to the high efficiency, multi-purpose, did not have the fluorine, the energy conservation, the intellectualization, the human nature direction develops, therefore the traditional air conditioning satisfied with difficulty modern the development request. This graduation project uses S7-200PLC to take the important control unit, carries on the design to the central refrigeration air conditioning cold intermediary water temperature control system.
Key words: PLC ; the frequency conversion control

 
目  錄
 
第一章  緒論 1
1.1引言 1
1.1.1空調(diào)概述 1
1.1.2空調(diào)分類 2
1.1.3空調(diào)的發(fā)展 3
1.2研究的目的和意義 4
1.3國內(nèi)外研究現(xiàn)狀 5
1.4研究的主要內(nèi)容及主要技術(shù)參數(shù) 6
第二章  中央變頻空調(diào)系統(tǒng)簡介 7
2.1中央變頻空調(diào)的工作原理 7
2.2中央空調(diào)水系統(tǒng)簡介 8
2.2.1冷卻水系統(tǒng)： 9
2.2.2冷凍水系統(tǒng) 10
2.2.3冷水機(jī)組的要求 13
2.3風(fēng)機(jī)盤管系統(tǒng) 14
2.3.1 風(fēng)機(jī)盤管概述 14
2.3.2 風(fēng)機(jī)盤管系統(tǒng)供新風(fēng)的方式 15
2.3.3 風(fēng)機(jī)盤管的水系統(tǒng) 16
2.3.4  風(fēng)機(jī)盤管系統(tǒng)的主要優(yōu)點(diǎn)及特性 17
2.4部分重要設(shè)備介紹: 18
2.4.1壓縮機(jī) 18
2.4.2 變頻器 19
2.5中央變頻空調(diào)控制系統(tǒng)的組成 28
2.6中央控制單元的硬件組成 29
2.6.1機(jī)組保護(hù)系統(tǒng) 29
2.6.2各故障燈的含義及復(fù)位方法 30
2.7機(jī)組控制 32
2.7.1 機(jī)組調(diào)試 32
2.7.2機(jī)組正常運(yùn)行操作程序 33
2.7.3   自動(dòng)與手動(dòng) 35
第三章 中央變頻空調(diào)控制系統(tǒng)的研究 35
3.1中央變頻空調(diào)的控制方式 35
3.2控制方式的選擇 36
3.2.1  PID控制的優(yōu)點(diǎn) 36
3.2.2 PID控制原理 37
3.2.3回路控制類型的選擇 40
3.2.4 PID 算法原理 41
3.2.5PID溫度控制原理 44
3.3中央變頻空調(diào)系統(tǒng)的控制原理 45
第四章  S7-200PLC控制下的變頻調(diào)速系統(tǒng)的研究 47
4.1 S7-200PLC簡介 47
4.2 VF-7變頻器簡介及功能說明 50
4.3 PLC控制下變頻調(diào)速系統(tǒng)的工作原理 52
設(shè)計(jì)總結(jié) 55
參考文獻(xiàn) 55
英文資料及翻譯 57
致謝 81
附錄1  元件清單 82