文档介绍：摘要
空调对国民经济各部门的发展和对人民物质文化生活水平的提高有着重要的作用,这不仅意味着受控的温度环境对各种工业生产过程的稳定运行和保证产品的质量和数量有重要作用,而且对提高劳动生产率,保证人体健康,创造舒适的工作和生活环境有着重要的意义。
该系统以PLC为控制核心,由两台75KW变频器分别驱动三台电动机,PLC根据冷媒水温度反馈信号,从而改变与冷媒水的热量交换量,对冷媒水的温度进行控制,可以实现对空调水系统温度的自动控制,使其达到空调系统所要求的温度。
近年来,随着微电子技术,传感器技术以及控制理论的发展,空调技术和性能得到了很大进步,空调开始向大功率,多功能,无***,节能,智能化,人性化方向发展,因此传统的空调难以满足现代的发展要求。本次毕业设计采用S7-200PLC作为中央控制单元,对中央制冷空调的冷媒水温度控制系统进行设计。
关键词:PLC 冷媒水变频控制
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 fortable 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 refrigerat