3HSD-0000030007 ABB

ABB 3HSD-0000030013
ABB 3HSD-0000030033
ABB 3HSD-0000030034
ABB 4C4689
ABB 4N4363
ABB 4N4373

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Description

系统接地方式有:浮空方式、直接接地方式和电容接地三种方式。对DCS/plc控制系统而言,它属低电平控制装置,应采用直接接地方式。由于信号电缆分布电容和输入装置滤波等的影响,装置之间的信号交换频率一般都低于1mhz,所以系统接地线采用一点接地和串联一点接地方式

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