MCS SA1000

在对处于正迁移状态差压变送器使用过程中的测量准确度进行判断时，将会遇到以下两种问题：一是仪表输出错误，如果安装正常的操作顺序，应该先对差压变送器三阀组的正负压测量时进行关闭，然后进行平衡阀打开和放空仪表堵头操作，4mA极限值应该远远高于仪表输出值，倘若仪表输出值大于极限值，那么则说明运行装置存在堵塞现象，最有可能发生故障的位置有三阀组和正压室引线；二是迁移量或者是零位显示不正常，如果将正压室取压点和放空开关依次进行关闭、打开操作后，仪表输出正常的情况下应该显示4mA，那么在迁移量或者是零位都较小时，仪表输出值将会明显低于4mA，反之，倘若仪表输出值大于4mA，此时零位或者是迁移量也会随之升高，此外，隔离液外漏或者是未装满会导致正负压室有隔离液渗入现象的发生。 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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