1、摘摘 要要 空气压缩机(简称空压机)是一种用来压缩气体提高气体压力或输送气 体的机械。可编程控制器(PLC)将传统的继电器控制技术、计算机控制技术 和通信技术融为一体，专为工业控制而设计。 本设计方案采用 PLC 和变频器实现对空压机组的自动控制。该方案采 用变频器实现对空压机“一拖多”的控制， PLC 实现变频器的工频与变频的 转换控制，以及切换变频器对某台空压机进行控制。系统利用压力传感器 采集气包出口压力，通过变送器输出 420 毫安标准信号至 PLC 模拟输入 端口，经过 PLC 内部 PID 算法逻辑运算，送出控制信号至变频器，变频器 根据送来的信号改变输出电压的频率，来调节电机转速
2、，以确保供气压力 的恒定。 关键词：关键词：空气压缩机；可编程控制器（PLC）控制系统；变频器；PID 调节 器 ABSTRACT Pressure fan is the power source of the coal mine pneumatic machinery,is one of the important equipment coal mine.Programmable Logic Controller (PLC) to the traditional relay control technology, computer control technology and communi
3、cation technology integration, specifically designed for industrial control and design. The design uses PLC and frequency converter to realize the automatic control of air compressor. The program uses inverter of the air compressor “dragged more“ control, PLC to achieve the inverter frequency and fr
4、equency conversion control, and inverter switching control of a compressor station. Collection system using pressure sensors Outlet pressure air bag, transmitter output by 4 to 20 mA standard signal to the PLC analog input port, through the internal PID algorithm PLC logic operations, sends control signals to the inverter. According to the change of frequency converter sent the signal output voltage frequency, to adjust the motor speed,to ensure that the gus supply pressure constant. Keywords:
