聯系人：黃曉飛(銷售工程師) 移動電話:18030263579 固話:0592-6895320 QQ：2472574325

工作，避免電壓過限可能損壞器件。

（3）采用屏蔽電纜或絞合電纜。對于變頻器和P L C 而言，弱電控制信號（電壓0～5V/10V、電流0/4～20ｍＡ等）易受到外界強信號的干擾，必須對控制信號采取適當的屏蔽措施。常用的方式就是采用屏蔽電纜進行屏蔽；對于長距離的控制回路宜采用絞合電纜，絞合電纜的絞合間距盡可能小。

（4）主、控電纜分開布線。實際連線時，注意主、控電纜分開布線，且相隔一定的距離。以保證主電路側的干擾及噪音影響不到控制電路。

變頻器運行時對PLC干擾應注意的問題

變頻器運行時會對周圍電氣設備（包括P L C ）產生較強的電磁干擾，同時變頻器主電路斷路器等開關器件動作時也會影響PLC 的正常工作。為防止變頻器運行時對PLC干擾，變頻器與P L C 相連接時應該注意以下幾點：

（1）對PLC 本身應按規定的接線標準和接地條件進行接地，而且應注意避免和變頻器使用共同的接地線，且在接地時使二者盡可能分開。

（2）當電源電壓波動大，諧波成分多時，為抑制諧波干擾，應在PLC 的電源模塊及輸入/ 輸出模塊的電源線上接入噪音濾波器或者隔離變壓器。如果干擾仍嚴重，應考慮在變頻器主回路中接入電抗器、專用變壓器和噪音濾波器等措施。

（3）變頻器和P L C 安裝在同一電控柜時，應盡可能使與變頻器有關的電纜和與PLC 有關的電纜分開安裝，尤其是連接變頻器的強電電纜與連接PLC 的弱電電纜更要分開安裝。

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