IS215UCVFH2A

GE   IS215UCVFH2A

变频器需要可靠接地，变频器的接地叫保护接地。

    保护接地：就是将正常情况下不带电，而在绝缘材料损坏后或其他情况下可能带电的电器金属部分（即与带电部分相绝缘的金属结构部分）用导线与接地体可靠连接起来的一种保护人的方式。

    保护接零：是指电气设备正常情况下不带电的金属部分用金属导体与系统中的零线连接起来，当设备绝缘损坏碰壳时，就形成单相金属性短路，短路电流流经相线——零线回路，而不经过电源中性点接地装置，从而产生足够大的短路电流，使过流保护装置迅速动作，切断漏电设备的电源，以保障人身安全。

    变频器正确接地应注意以下：

    (1)接地端E(G)的接地电阻应小于4Ω且越小越好。

    (2)接地导线截面积应不小于2.5㎜2.长度应控制在20m以内，接地必须牢固。

    (3)变频器的接地装置必须与动力设备的接地装置分开不能共用。

    (4)变频器信号输人线的屏蔽层应接至E(G)上。

    (5)变频器与控制柜之间的接地应联通.如果安装有困难，可以用铜芯导线跨接。

    保护接地与保护接零的主要区别：

    （1）保护原理不同

    保护接地是限制设备漏电后的对地电压，使之不超过安全范围。在高压系统中，保护接地除限制对地电压外，在某些情况下，还有促使电网保护装置动作的作用；保护接零是借助接零线路使设备漏电形成单相短路，促使线路上的保护装置动作，以及切断故障设备的电源。此外，在保护接零电网中，保护零线和重复接地还可限制设备漏电时的对地电压。

    （2）适用范围不同

    保护接地即适用于一般不接地的高低压电网，也适用于采取了其他安全措施（如装设漏电保护器）的低压电网；保护接零只适用于中性点直接接地的低压电网。

    （3）线路结构不同

    如果采取保护接地措施，电网中可以无工作零线，只设保护接地线；如果采取了保护接零措施，则必须设工作零线，利用工作零线作接零保护。保护接零线不应接开关、熔断器，当在工作零线上装设熔断器等开断电器时，还必须另装保护接地线或接零线

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