Description
当PLC内部程序运行使Y001端子内部硬触点闭合时，相当于变频器的STF端子外部开关闭合，STF端子输入为ON，变频器启动电动机正转，调节10、2、5端子所接电位器可以改变端子2的输入电压，从而改变变频器输出电源的频率，进而改变电动机的转速。
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