基于增量式PID控制的医院中心负压系统设计

摘要

目的 设计一套编程控制器(Programmable Logic Controller,PLC)控制的医院负压中心系统,将负压压力值稳定在-0.06 Mpa.方法 采用三菱FX2N系列可编程控制器,利用PLC内部烧录的程序和增量式PID指令模块对储气罐负压压力值进行自动调控,并加入ABB ACS 510系列变频器进行真空泵的软启动与变频调速.结果 建设的负压系统能自动调控压力值,具有故障报警功能,能够切换手控与自控,其真空泵能进行软启动、节能降噪.结论 基于增量式PID控制的医院中心负压具有强抗干扰性,系统精简,能够确保负压系统稳定运行,为临床提供强有力的保障.%Objective Design a set of programmable controller to control the hospital negative pressure center system, and to keep the negative pressure value stable at -0.06 MPa. Methods MITSUBISHI FX2N series programmable controller was introduced to conduct the research. PLC programming procedures and incremental PID instruction module were used to control the gas tank pressure. The ACS 510 ABB series inverter was jointed to perform the soft starting and regulate the speed of variable frequency. Results The negative pressure system could automatically control the pressure value. Meanwhile, it could give an alarm when there was something wrong, and could switch the manual control and automatic control freely. The vacuum pump could carry out soft starting. In addition, it was energy saving and noise reduction. Conclusion The system of the negative pressure of hospital center based on incremental PID control is simple, which has strong anti-jamming capacity. It can ensure the stable operation of the negative pressure system, and provide a strong guarantee for clinical.