3HAB 8101-8
3HAB 8101-8
3HAB 8101-8
信号线引入的干扰。
与PLC控制系统连接的各类信号传输线,除了传输有效的各类信号之外,会有外部干扰信号侵入。此干扰主要有两种途径:一是通过变送器或共用信号仪表的供电电源串入的电网干扰;二是信号线受空间电磁辐射感应的干扰,由此引起系统故障的情况也很多。
接地系统的干扰。
接地是提高电子设备电磁兼容性(EMC)的有效手段。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。
变频器干扰。
一是变频器启动及运行过程中产生谐波对电网产生传导干扰,引起电网电压畸变,影响电网的供电质量;二是变频器的输出会产生较强的电磁辐射干扰,影响周边设备的正常工作。
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