自动门
自动门:旋转门程序控制
发布时间:2014/8/17
自动门讯:
旋转门程序控制
    有些变频器中也称简易PLC控制。对于一个需要多档速操作的拖动系统来说,多档
速的选择可用外部控制来切换,也可依靠变频器内部定时器来自动执行。这种自动运行的
方式称为程序控制。如果选择程序控制,通常需要经过以下几个步骤:
  1)已知运行程序。首先要掌握拖动系统的运行程序。如第一档转速从哪里开始,运
行频率为多少,持续多长时间再切换到第二档转速等。
       第一档转速:正转,20Hz,持续lOs
       第二档转速:停止,持续30s ;
       第五档转速:正转35Hz,持续Imin30s
    运行组是用来存放一个运行程序所有数据的单元。一般的变频器都给提供了2~3个运
行组,供用户根据不同的负载用外部开关在各运行组中进行切换,以选择不同的运行程序。
    2)程序的给定。根据已知拖动系统的运行程序,将程序中各种参数用变频器提供的
功能码进行预置。预置通常包括下面几个步骤:
    a.选择程序运行的时间单位可以在“分/秒”之间选择。
    b.选择一个运行组,将运行程序中各程序段的旋转方向、运行频率、持续时间(或
开始时间)输入到所对应的指令中去。
    c.远行组的选择和切换。在变频器的控制端子中选择三个开关Xl、Xz、X3在各运行
组之间进行切换,若X1闭合,选择第一运行组;若X3闭合,选择第三运行组;若三个
开关都闭合,则三个运行组依次执行一遍。

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