768963 ABB

ABB 3ASC25H208
ABB A9-30-10,AC220V
ABB SDCS-IOB-3-COAT 3ADT220090R0020
ABB SDCS-IOB-22-COAT 3ADT220090R0013
ABB 8018545 PUMP, 4N, 230 V, 50/60 HZ

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Description

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,

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