可编程序控制器是在继电器控制和计算机控制的基础上开发的产品,自60年代末,美国首先研制和使用可编程控制器以后,世界各国特别是日本和联邦德国也相继开发了各自的PLC(programmable logic controller),因此,与传统的继电器接触器控制系统相比较,笔者认为采用PLC实现鼠笼式异步电动机起制动控制是*明智的选择。下面就是笔者设计的采用PLC实现的鼠笼式异步电动机起制动控制电路的接线图、梯形图和指令程序,如图2和图3所示。
PLC控制逻辑与传统的继电器接触器控制系统基本一致,其工作过程如下:
起动时,按下起动按钮SB1,X400常开触点闭合,Y430线圈接通并自锁,KM1线圈接通,主触头吸合,电动机串入限流电阻R开始起动,同时Y430的两对常开触点闭合,当电动机转速上升到某一定值时,KS1的常开触点闭合,X402常开触点闭合,M100线圈接通并自锁,M100的一对常开触点接通Y432的线圈,KM3线圈有电主触头吸合,短接起动电阻,电机转速上升至给定值时投入稳定运行。
制动时,按下停机按钮SB2,X401常开触点断开Y430线圈,使KM1失电释放,而Y430的常闭触点接通Y431线圈,制动用的接触器KM2线圈通电,对调两相电源的相序,电动机处于反接制动状态。与此同时,Y430的常开触点断开Y432的线圈,KM3失电释放,串入电阻R限制制动电流。当电动机转速迅速下降至某一定值时,KS1常开触点断开,X402常开触点断开M100的线圈,M100的常开触点断开Y431线圈,KM2失电释放,电动机很快停下来。过载时,热继电器FR常开触点闭合,X403的两对常闭触点断开Y430和M110的线圈,从而使KM1或KM2失电释放,起到过载保护作用。
上述控制过程指令程序如下:
PLC与继电器接触器控制系统的比较
通过对鼠笼式异步电动机起制动的传统控制方法和PLC控制方法的比较,从某种意义上看,PLC控制是从继电器接触器控制发展而来的。两者既有相似性又有很多不同处。
1 二种方案的不同点
(1) PLC内部大部分采用“软”逻辑
继电器接触器控制全部用硬器件、硬触点和“硬”线连接,为全硬件控制;PLC内部大部分采用“软”电器、“软”接点和“软”线连接,为软件控制。
(2) PLC控制系统结构紧凑
继电器接触器控制系统使用电器多,体积大且故障率大;PLC控制系统结构紧凑,使用电器少,体积小。
(3) PLC内部全为“软接点”动作快
电器接触器控制全为机械式触点,动作慢,弧光放电严重;PLC内部全为“软接点”动作快。
(4) PLC控制功能改变极其方便
继电器接触器控制功能改变,需拆线接线乃至更换元器件,比较麻烦;PLC控制功能改变,一般只需修改程序便可,极其方便。
(5) PLC控制系统制造周期短
PLC控制系统由于结构简单紧凑,基本为软件控制,因此设计、施工与调试比继电器接触器控制系统周期短。
此外,由于PLC技术是计算机控制的基础上发展而来,因此,它的软硬件设置上有着传统的继电器接触器控制无法比拟的优势,工作可靠性极高。
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