【正文】
I 摘 要 隨著現(xiàn)代生活不斷向智能化邁進(jìn),人們對(duì)中央空調(diào)的性能提出了更高的要求,如空調(diào)的舒適性、節(jié)能性等。本文介紹了在空調(diào)系統(tǒng)中使用智能化的冷水機(jī)組控制系統(tǒng), 通過(guò)在原來(lái)的老式中央空調(diào)系統(tǒng)上增設(shè)新的硬件設(shè)備以及編寫軟件程序, 使 電機(jī)的轉(zhuǎn)速 能夠隨著外界環(huán)境的變化 實(shí)現(xiàn) 自動(dòng)的調(diào)節(jié) , 從而既能提供舒適的生活環(huán)境,又能最大限度的節(jié)約能源。 本文 在對(duì)中央空調(diào)的冷水機(jī)組循環(huán)系統(tǒng)組成結(jié)構(gòu)進(jìn)行分析后, 指出了老式中央空調(diào)系統(tǒng)運(yùn)行的種種不足之處,經(jīng)過(guò)主電路控制方式論證,采用“一拖一”的方式對(duì) 冷水機(jī)組循環(huán)系統(tǒng)進(jìn)行變頻控制。 并給出主電路 、控制電路的電氣原理圖 。 文中還詳細(xì)的介紹了中央空調(diào)溫度控制系統(tǒng)的硬件和軟件設(shè)計(jì), 包括三菱 FX2N 系列 PLC、風(fēng)泵專用變頻器 FRF54037KCH 工作原理,端子介紹, 變頻器參數(shù) 預(yù)設(shè)值流程 ,PLC 程序介紹 等,最后形成 了 采用三菱 FX2N64MR PLC 作為控制單元,通過(guò)交流變頻調(diào)速器控制水泵速度, 達(dá)到了 系統(tǒng)根據(jù)實(shí)際負(fù)荷的情況調(diào)整流量,實(shí)現(xiàn)恒溫控制,同時(shí)又可以節(jié)約大量能量 的目的 。 關(guān)鍵詞:中央空調(diào) ; PLC; 變頻器 II Abstract As modern bee more intelligent daybyday,people hope central air conditioner have more excellent capability,such as fort and energy paper mostly research on how to use intelligent controller to control water circulation sys tem of central air conditioner, make the motor speed can automatic adjustment with the external environment changing,we should add some new hardware devices and software programs so the air conditioner can supply fort and use less energy as possible. In this paper,we analyze the position of the water circulation system of central air conditioner,and pointed out that the old central air conditioning systemis running a variety of shortings,demonstrated the method through the main circuit,and using “one drag one way to control the system,continue give the main and the control circuit. In this paper,we introduce the hardware and software design for the control system. Including the SanLing FX2N Series PLC,pumps dedicated frequency conversion FRF54037KCH39。s works,terminal description,parameter default process,PLC program description,etc.,And finally formed the SanLing FX2N64MR PLC as the control unit,and drive pumps by frequency conversion achieve pumps speed control can adjust its power and carry out constant temperature,as well as save a great deal energy. Keywords: central air conditioner; PLC; frequency conversion III 目 錄 摘 要 ................................................................................................................................ I Abstract .............................................................................................................................. II 第 1章 前言 .......................................................................................................................... 1 引言 ......................................................................................................................... 1 空調(diào)控制方法的研究現(xiàn)狀以及發(fā)展趨勢(shì) ............................................................. 2 本文的主要工作 ..................................................................................................... 2 第 2章 中央空調(diào)冷水機(jī)組的組成及工作原理 .................................................................. 3 中央空調(diào)冷水機(jī)組的組成 ...................................................................................... 3 中央空調(diào)冷水機(jī)組的工作原理 .............................................................................. 3 第 3章 中央空調(diào)變頻節(jié)能設(shè)計(jì) .......................................................................................... 5 原中央空調(diào)系統(tǒng)的運(yùn)行以及存在的問(wèn)題 .............................................................. 5 變頻節(jié)能原理 ......................................................................................................... 5 變頻節(jié)能改造方案的選擇 ...................................................................................... 6 冷卻水機(jī)組節(jié)能方案選擇 .......................................................................... 7 冷凍水機(jī)組節(jié)能方案選擇 ......................................................................... 7 主電路控制方案 ..................................................................................................... 8 冷卻泵、冷凍泵主電路與控制電路接線圖 ....................................................... 10 冷卻泵主電路與控制電路接線圖 ........................................................... 10 冷凍泵主電路與控制電路接線圖 ........................................................... 11 第 4章 中央空調(diào)變頻控制系統(tǒng)的實(shí)現(xiàn) ............................................................................ 12 PLC 的選型 ............................................................................................................ 12 可編程控制器 PLC的基本功能 ............................................................... 12 三菱 FX2N 系列 PLC 介紹 ......................................................................... 12 三菱 FX2N64MR PLC ................................................................................ 13 溫度傳感器模塊 ....................................................................................... 13 模擬量輸出模塊 ....................................................................................... 14 溫度傳感器 ............................................................................................... 14 變頻器的選型 ....................................................................................................... 15 變頻器的工作原理 ................................................................................... 15 變頻器的控制方式 ................................................................................... 16 三菱 FRF54037KCH .............................................................................. 17 實(shí)現(xiàn)控制系統(tǒng)需要增加的設(shè)備列表 ................................................................... 24 PLC 與變頻器的 I/O 分配 .................................................................................... 24 IV 變頻調(diào)速系統(tǒng)接線圖 ........................................................................................... 25 第 5章 變頻調(diào)速系統(tǒng)軟件設(shè)計(jì) ........................................................................................ 27 中央空調(diào)變頻調(diào)速系統(tǒng)控制流程 ....................................................................... 27 PLC 主要部分 程序分析 ........................................................................................ 28 第 6章 結(jié)論 ................................................................................