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V20变频器手自动切换(就地远程切换)的具体方法示例
2022-07-07 21:50:00 【AAA_自动化工程师】
V20变频器手自动切换(就地远程切换)的具体方法示例
一种比较常用的典型设计是就地模式下通过电气柜按钮控制变频器启停,通过变频器面板调节频率;远程模式下通过PLC的DO输出控制变频器启停,两种模式下都通过变频器的AO输出频率反馈,通过中间继电器输出运行反馈。
西门子V20变频器没有这种模式的宏,需要自己设置,具体的方法可参考如下: |
设计接线方式如下所示:
DI1:启动/停止控制输入
DI2:远程/就地切换输入
DO1:运行反馈
DO2:故障反馈
AI2:远程频率给定(4~20mA)
AO1:频率反馈(4~20mA)
电路图如下所示,
控制要求如下:
就地控制:DI1控制变频启停,BOP面板给定频率
远
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