1794-IA16
1794-IA16
1794-IA16
4.4 正确选择接地点，完善接地系统
接地的目的通常有两个，其一为了安全，其二是为了***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***好埋在距建筑物 10 ~ 15m 远处，而且 PLC 系统接地点必须与强电设备接地点相距 10m 以上。
备货，备货，降降降，火火火，火火火……
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