PLC的变频器控制电机正反转接线图
1．按接线图将线连好后，启动电源，准备设置变频器各参数。
2．按“MODE”键进入参数设置模式，将Pr.79设置为“2”：外部操作模式，启动信号由外部端子（STF、STR）输入，转速调节由外部端子（2、5之间、4、5之间、多端速）输入。
3．连续按“MODE”按钮，退出参数设置模式。
4．按下正转按钮，电动机正转起动运行。
5．按下停止按钮，电动机停止。
6．按下反转按钮，电动机反转起动运行。
7．按下停止按钮，电动机停止。
8.若在电动正转时按下反转按钮，电动机先停止后反转；反之，若在电动机反转时按下正转按钮，电动机先停止后正转。
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