描述
三菱变频器外部端子调速可分为模拟量调速和多段速调速。模拟量调速可用电压DC0~10V或电流DC4~20mA,进行无级调速。我厂用0~10V模拟电压作为给定量,进行开环调速;多段速采用外部输入端子SD﹑STF﹑RL﹑RM﹑RH,进行三段速调速。RL﹑RM﹑RH是低﹑中﹑高三段速速度选择端子,SD是输入公共端,STF是启动正转信号。如图3中,当Y10,Y11有输出时,变频器为低速运行;当Y10,Y12有输出时,为中速运行;当Y10,Y13有输出时为高速运行。变频器2﹑3原理与此相同。三段速分别设置为15Hz﹑30Hz﹑45Hz。在模拟量调速时,通过调整W1﹑W2的分压比设置KA1闭合时变频器高速运行,KA2闭合时为低速运行,当KA1﹑KA2都断开时,变频器为最高速;变频器2﹑3原理与此相同。通过编程,PLC根据操作台发出的信号,选择控制方式:模拟量调速或多段速调速。三菱变频器的多段速调速比模拟量调速有较高优先级(1)。
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