西门子变频器6SE6440-2UC11-2AA1

6SE6440-2UC11-2AA1

在干扰较强或可靠性要求较高的场合，应该用带屏蔽层的隔离变压器，对PLC系统供电。还可以在隔离变压器二次侧串接LC滤波电路。同时，在安装时还应注意以下问题：

（1）隔离变压器与PLC和I/O电源之间好采用双绞线连接，以控制串模干扰；

（2）系统的动力线应足够粗，以降低大容量设备起动时引起的线路压降；

（3）PLC输入电路用外接直流电源时，好采用稳压电源，以保证正确的输入信号，否则可能使PLC接收到错误的信号。

远离强干扰源

（1）动力线、控制线以及PLC的电源线和I/O线应分别配线，隔离变压器与PLC和I/O之间应采用双胶线连接。将PLC的IO线和大功率线分开走线，如在同一线槽内，分开捆扎交流线、直流线，若条件允许，分槽走线好，这不仅能使其有尽可能大的空间距离，并能将干扰降到低限度。

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