描述
继传统的接触器、继电器等电气控制系统之后,性能强大、功能丰富的工控装置PLC(可编程控制器)成为当下电工技术的新宠,用廖常初老师的话讲——现在的电工工作人员如果专业知识架构中,没有一定的变频器、PLC等工控装置的技术储备,几乎是无法胜任本职工作的!那么今天我们就来聊一下PLC电源用线方面的相关知识,大家可不要小看这个问题,要知道实际工作中PLC发生死机、误动作等故障现象,有近一半的原因正是由于PLC电源质量欠佳所造成的!
①、PLC的供电电源线应取自电压较稳定的干线或单独引自配电点,以此来确保PLC供电质量。如果电网电压波动较大(如含有大功率负载),应考虑加装具有稳压功能的UPS装置。
②、PLC的电源线最好采用具有一定抗干扰能力的双绞线,其截面不应低于2mm²(部分欧美机型要求不得低于4mm²)。此外在配线过程中,PLC的I/O、负载等应尽可能单独的电源线供电,不得从PLC电源输入线上并接。
③、当电源中噪声过大时(多由于电网内变频器等装置污染所致),对PLC供电应采用隔离变压器,阻止噪声干扰进入PLC。
④、在采用隔离变压器和低通滤波器时,PLC电源线应先经隔离变压器→低通滤波器后再接入PLC。若所用隔离变压器采用双隔离技术时,一次侧屏蔽层应接中线,以便隔离进线端的电磁干扰;二次侧屏蔽层与PLC系统控制柜要共地连接,同时隔离变压器二次侧输出线不得接地!
⑤、为防止电网的浪涌过电压窜入PLC造成其损坏,可在PLC的电源输入端接入压敏电阻、浪涌保护器等吸收过电压元器件,并使所用元器件的接地端和PLC的接地线分开接地。
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