描述
变频器1﹑2﹑3分别控制电机M13﹑M14﹑M15,主回路接线图略。PLC为FX2-64MR。FMA﹑11是来自灌装机变频器0~10V的输出信号,经过信号隔离器的转换作为变频器1﹑2﹑3的控制信号。图中KA1-6为辅助继电器。W1-6为分压电位器。PLC的输入端子略。FMA﹑11是来自灌装机主机变频器的输出信号。两图中的PLC为同一PLC,图2中的COM6接DC24V电压,控制辅助继电器。
三.控制思想
变频器1﹑2﹑3的调速方式为两种:1.来自灌装机主机变频器的模拟信号DC0~10V,经过隔离器转换为线性DC0~10V,再经过电位器分压作为变频器1﹑2﹑3的给定信号,以控制电机M13﹑M14﹑M15,这样可以做到输送带与灌装机的速度很好匹配;2.采用多段速控制端子SD﹑STF﹑RL﹑RM﹑RH,通过PLC编程,由PLC发出控制信号以控制速度。PLC根据灌装机操作台发出的信号来判断使用那种速度控制方式,又根据瓶流情况选择高低速。在模拟信号控制时是通过辅助继电器KA1和KA2,KA3和KA4,KA5和KA6的组合,经W1﹑W2,W3﹑W4,W5﹑W6分压控制变频器输出速度。在多段速时通过PLC的输出Y10﹑Y11﹑Y12﹑Y13,Y20﹑Y21﹑Y22﹑Y23,Y24﹑Y25﹑Y26﹑Y27分别调节各个变频器的输出频率以达到多段输送带的速度匹配及与灌装机的速度匹配。在模拟控制方式调整中,电位器分压比的调整是个关键,通过生产调试中摸索,终于找到了比较好的速度匹配。分压比一旦调好,不得随意改动。
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