福建遠(yuǎn)臣機(jī)電工程分部

聯(lián)系人：黃曉飛(銷(xiāo)售工程師) 移動(dòng)電話:18030263579 固話:0592-6895320 QQ：2472574325

工作，避免電壓過(guò)限可能損壞器件。

（3）采用屏蔽電纜或絞合電纜。對(duì)于變頻器和P L C 而言，弱電控制信號(hào)（電壓0～5V/10V、電流0/4～20ｍＡ等）易受到外界強(qiáng)信號(hào)的干擾，必須對(duì)控制信號(hào)采取適當(dāng)?shù)钠帘未胧３Ｓ玫姆绞骄褪遣捎闷帘坞娎|進(jìn)行屏蔽；對(duì)于長(zhǎng)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(kāi)布線。實(shí)際連線時(shí)，注意主、控電纜分開(kāi)布線，且相隔一定的距離。以保證主電路側(cè)的干擾及噪音影響不到控制電路。

變頻器運(yùn)行時(shí)對(duì)PLC干擾應(yīng)注意的問(wèn)題

變頻器運(yùn)行時(shí)會(huì)對(duì)周?chē)姎庠O(shè)備（包括P L C ）產(chǎn)生較強(qiáng)的電磁干擾，同時(shí)變頻器主電路斷路器等開(kāi)關(guān)器件動(dòng)作時(shí)也會(huì)影響PLC 的正常工作。為防止變頻器運(yùn)行時(shí)對(duì)PLC干擾，變頻器與P L C 相連接時(shí)應(yīng)該注意以下幾點(diǎn)：

（1）對(duì)PLC 本身應(yīng)按規(guī)定的接線標(biāo)準(zhǔn)和接地條件進(jìn)行接地，而且應(yīng)注意避免和變頻器使用共同的接地線，且在接地時(shí)使二者盡可能分開(kāi)。

（2）當(dāng)電源電壓波動(dòng)大，諧波成分多時(shí)，為抑制諧波干擾，應(yīng)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(yán)重，應(yīng)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(shí)，應(yīng)盡可能使與變頻器有關(guān)的電纜和與PLC 有關(guān)的電纜分開(kāi)安裝，尤其是連接變頻器的強(qiáng)電電纜與連接PLC 的弱電電纜更要分開(kāi)安裝。

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