纺织厂恒温恒湿环境控制系统设计(控制专业).pdf

中国石油大学(华东)
硕士学位论文
纺织厂恒温恒湿环境控制系统设计
姓名:葛平庆
申请学位级别:硕士
专业:控制工程
指导教师:张加胜
20091001
摘要
本论文设计了一种基于模拟电路的恒温恒湿变频空调系统。设计思路是通过模拟控
制电路来控制变频器的输出频率,并由变频器控制温湿空调电动机,以实现纺织厂的恒
温恒湿环境。
系统的设计包括硬件电路设计和应用程序软件设计。硬件电路设计主要是模拟控制
电路的设计,包括电源和差分比例调节电路。将温湿度变送器采集到的电压信号进行差
分比例调节后送入西门子变频器 Micromaster430的模拟量输入端,以控制变频器的输
出频率。系统应用软件的设计包括利用VB6.0建立上位机的监控软件和应用UISS协议
实现PC机与变频器的通讯。通过监控界面,操作人员能以数据、模拟表盘、曲线的形
式监视系统参数。另外,操作人员还能通过人机界面实现对变频器的参数设置与命令给
定。本文还介绍了USS协议及其在西门子变频器与PC通讯中的应用,IEEE浮点数的
格式和上位机对从变频器中读出的数据进行处理的方法
最后,本文介绍了系统的调试情况,包括硬件电路和系统软件的调试。经过现场测
试,实现了恒温恒湿的室内环境,系统基本能达到课题的设计要求。
关键词:温湿度变送器;变频器;VB6.0;USS协议;IEEE浮点数
Design of control system about textile mill environment under
constant temperature and humidity
Ge Pingqing(Control Theory and Control Engineering
Directed by Prof. Zhang Jiasheng
Abstract
In this paper, based on analog circuit, an inverter type air-conditione system is designed
The design mentality is to control the output frequency of inverter by way of analog control
circuit so that the motor of artificial atmosphere is controlled. Then a textile factory will
operate under constant temperature and humidity.
The system is composed of hardware design and application software design. The major
respect of hardware design is the design of analog control circuit including the power and the
differential proportional regulator. The voltage of signal acquired by temperature and
humidity transmitter is sent to the analog input terminal of Micromaster 430 after the process
of diferential motional re laor o onl e output frequency of inverter. The design
application software design consists of the design of monitoring software of the host
computer based on VB6. 0 and the communication between the Siemens inverter and PC with
the USS protocol. Operaters can monitor the system parameters in forms of datas, mimic
panels and curves from the main monitoring interface. Besides, operaters can set parameters
and give commands to inver er. This paper also introuces the USS protocol and its
application in the communication between the inverter and PC. And then, the formatting of
IEEE floating point data and the process of da as ot from the inverter is introduced
At last, the paper introduces the operation of the engineering including the hardware
operation and software operation. After site testing, an environment under constant
temperature and humidity was achieved. And the system scessfully meet the demands of the
Keywords: temperature and humidity transmitter, inverter, VB6.0, USS protocol, IEEE
floating point data