易卖工控网(www.ymgk.com)提供”PP220 3BSC690099R1 ABB”,产品详情:品牌/厂家:ABB、型号:PP220、成色:全新、货期:现货 1天内发货、保修:180天,更多产品详情就上易卖工控网。
ABB PP220 3BSC690099R1
ABB PP220 3BSC690099R1
接地的目的通常有两个,是为了抑制干扰。完善的接地系统是PLC控制系统抗电磁干扰的重要措施之一。
系统接地方式有:浮地方式、直接接地方式和电容接地三种方式。对PLC控制系统而言,它属高速低电平控制装置,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PLC控制系统接地线采用一点接地和串联一点接地方式。集中布置的PLC系统适于并联一点接地方式,各装置的柜体中心接地点以单独的接地线引向接地极。如果装置间距较大,应采用串联一点接地方式。用一根大截面铜母线(或绝缘电缆)连接各装置的柜体中心接地点,然后将接地母线直接连接接地极。接地线采用截面大于22mm2的铜导线,总母线使用截面大于60mm2的铜排。接地极的接地电阻小于2Ω,接地极埋在距建筑物10 ~ 15m远处,而且PLC系统接地点与强电设备接地点相距10m以上。
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