METSO PDP401

METSO PDP401接地是提高电子设备电磁兼容性（EMC）的有效手段之一。正确的接地，既能抑制电磁干扰的影响，又能抑制设备向外发出干扰；而错误的接地，反而会引入严重的干扰信号，使PLC系统将无法正常工作。PLC控制系统的地线包括系统地、屏蔽地、交流地和保护地等。接地系统混乱对PLC系统的干扰主要是各个接地点电位分布不均，不同接地点间存在地电位差，引起地环路电流，影响系统正常工作。例如电缆屏蔽层必须一点接地，如果电缆屏蔽层两端A、B都接地，就存在地电位差，有电流流过屏蔽层，当发生异常状态加雷击时，地线电流将更大。

此外，屏蔽层、接地线和大地有可能构成闭合环路，在变化磁场的作用下，屏蔽层内有会出现感应电流，通过屏蔽层与芯线之间的耦合，干扰信号回路。若系统地与其它接地处理混乱，所产生的地环流可能在地线上产生不等电位分布，影响PLC内逻辑电路和模拟电路的正常工作。METSO PDP401工作的逻辑电压干扰容限较低，逻辑地电位的分布干扰容易影响PLC的逻辑运算和数据存储，造成数据混乱、程序跑飞或死机。模拟地电位的分布将导致测量精度下降，引起对信号测控的严重失真和误动作。

Grounding is one of the effective means to improve the electromagnetic compatibility (EMC) of electronic equipment. Proper grounding can not only suppress the influence of electromagnetic interference, but also suppress the external interference of equipment; The wrong grounding will introduce serious interference signals, so that the PLC system will not work normally. The ground wire of METSO PDP401 control system includes system ground, shielding ground, AC ground, protective ground, etc. The disturbance of the chaotic grounding system to the PLC system is mainly the uneven potential distribution of each grounding point, and the ground potential difference between different grounding points causes the ground loop current and affects the normal operation of the system. For example, the cable shielding layer must be grounded at one point. If both ends a and B of the cable shielding layer are grounded, there is a ground potential difference, and there is current flowing through the shielding layer. When lightning strikes are added in an abnormal state, the ground wire current will be greater.

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