基于西門子PLC的中央空調變頻調速系統設計

電氣自動化論文編號:ZD087         字數:16643,頁數:44  

目 錄
第1章 緒論   1
1.1 總體設計方案的確定   1
1.2 中央空調的結構原理   1
1.3 基于PLC控制下的變頻調速系統工作原理   4
1.4 中央空調變頻調速的意義   7
第2章 I/O口外圍電路設計   8
2.1 系統的設計原則   8
2.2 模擬量輸入模塊選取   9
2.3 模擬量輸出模塊的選取   12
2.4 溫度檢測部分設計   14
2.5 顯示電路設計   14
2.6 變頻器的選擇及主電路設計   16
第3章 PLC的選擇及接口電路設計   21
3.1 PLC的特點   21
3.2 PLC的選擇和應用   22
3.3 輸入輸出點地址分配   23
第4章 PLC控制中央空調變頻調速系統的軟件設計   25
4.1 內存變量分配   25
4.2 主程序設計   26
4.3 溫度手控   28
4.4 冷卻水系統PID調節   30
4.5 冷凍水系統PID調節   32
4.6 傳送PID參數   33
4.7 中斷服務   34
結論   39
參考文獻   40
致謝   41
附錄   42

摘 要
隨著社會進步和經濟的高速發展，中央空調的應用也越來越廣泛，為創建高效、節能、舒適、安全的工作和生活環境奠定了基礎。傳統的中央空調存在著很多的缺點，因此在這種形勢下中央空調空調應運而生。
本文所述中央空調變頻調速系統主要由西門子PLC、溫度傳感器、變頻器、電機以及其它低壓保護和控制電器元件構成。整個系統采用模塊化設計，CPU主模塊采用CPU226，模擬量擴展模塊采用EM231，可根據需要靈活配置各模塊的數量。根據PLC輸入輸出量的多少,來決定PLC所需的點數,進而選取相應的大小的PLC. 溫度檢測部分設計；選擇變頻器；設計主電路；對制冷設備信息進行采集、顯示、其中制冷管道溫度傳感器對制冷管道溫度進行數據采集和對系統設備集中控制，更直觀的顯示現場系統在運行中的各種工況數據,提高了系統的可靠性。
對系統進行自動控制，該控制系統采用了先進的測控、變頻、工業自動化、和通訊網絡技術，設備的各項報警和保護功能齊全，安全系數大大提高。通過軟件設計完成中央空調所需的參數設置和控制要求，系統軟件由主程序、初始化程序、模擬量檢測程序組成，通過調用子程序來完成系統的數據采集、模擬量檢測和聲光報警等功能。

關鍵詞:中央空調；可編程控制器；變頻調速

Abstract
Along with society progress and economy of high speed development, central air condition of application also more and more extensive, for establish efficiently, economy energy, comfort, safety of work and the living environment lay foundation.The central air condition existence of tradition much weakness, so the central air condition air condition emerge with the tide of the times under this kind of situation.
This text say a central air condition to change Pin to adjust soon system main is spread a feeling machine by the Siemens PLC, temperature and change Pin machine, electrical engineering and other low pressure protection and control electric appliances component constitute.The whole system adoption mold piece turn design, CPU lord mold piece adoption CPU226, imitate the quantity expand a mold piece adoption EM231,According to PLC importation output quantity of how much, decision the point need by PLC, then selection correspond of the PLC of size. Temperature examination part design;The choice change Pin machine;Design lord electric circuit;Carry on collect towards making a cold equipments information, manifestation, make cold piping temperature to spread a feeling machine among them to make cold piping temperature to carry on a data to collect and to system equipments concentration control, more keep the manifestation of view the spot the system is in the movement of various work condition data, exaltation the credibility of the system.
To the system carry on auto control, should control system adoption forerunner of measure and control, changing Pin, industry automation, with communication network technique, equipments of each with protection the function be well-found, safety coefficient consumedly exaltation.Pass software design completion the parameter need by central air condition constitution and control request, system software from lord procedure, start to turn procedure, imitate quantity examination the procedure constitute, the data which pass to adjust to use sub- procedure completion system collect, imitate quantity examination harmony light report to the police etc. function.

Key words：Central air condition;Programmable controller;Change the Pin adjust soon