厦门市泰尼电器有限公司
主营产品: AB模块PLC |
厦门市泰尼电器有限公司
主营产品: AB模块PLC |
参考价 | 面议 |
更新时间:2018-04-06 17:23:41浏览次数:178
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本文介绍了如何降低变频器对DCS信号的干扰的措施。在这里要提醒各位,变频器的干扰会对其它设备的运行造成影响,所以变频器的抗干扰措施一定要作好,才能保证生产系统的安全可靠运行。
1.合理布线
能在相当大程度上削弱干扰信号的强度,布线时,各种设备的控制线应尽量远离变频器的输入、输出线。控制线在空间上,应尽量和变频器的输入、输出线交叉,是垂直交叉。
2.削弱干扰源
接入电抗器或滤波器,对小功率变频器,成本较高,我们采用一种低成本的电磁干扰抑制方法:将电机电缆从铁氧体环中穿过,使穿过部分导线的阻抗局部增大,阻止电磁干扰电流通过。如将导线在铁氧体环上绕几圈,总的电感和阻抗值将随圈数的平方而增大。电机电缆可从铁氧体环中穿过三次。但应注意,连接电机和变频器的接地线应留在环外。
1746-NI16I---1746-NI16I
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3.对线路进行屏蔽
变频器到电动机之间的连接线,应尽量穿入金属管内,金属管应该接地。信号线屏蔽层不论是接公共端还是接地,都只能在一端进行,切不可两端都接。
4.准确接地
接地线应尽量地粗一些,接地点应尽量靠近变频器;接地线应尽量远离电源线;变频器所用地接地线,必须和其他设备地接地线分开;必须避免把所有设备的接地线连在一起后再接地;变频器的接地端子不能和电源的“零线"相
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