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3BSE050091R20

模擬量信號(hào)連接應(yīng)注意的問題變頻器中的模擬量輸入信號(hào)，通常指0～10V/5V 的電壓信號(hào)或0/4～20 ｍＡ的電流信號(hào)；這些模擬量輸入信號(hào)可通過接線端子由外部給定，當(dāng)變頻器與P L C 連接時(shí)，這些模擬量輸入信號(hào)也可來自PLC 的模擬量輸出信號(hào)，如圖3 所示。在進(jìn)行模擬量的連接時(shí)應(yīng)注意：

（1）阻抗匹配。根據(jù)變頻器的輸入阻抗選擇P L C 的輸出模塊，實(shí)現(xiàn)兩者的阻抗匹配。

（2）電壓范圍。當(dāng)變頻器和P L C 的電壓信號(hào)范圍不同時(shí)（如變頻器的輸入信號(hào)為0～10V，而PLC 的輸出電壓信號(hào)范圍為0～5V 時(shí)；或PLC 的一側(cè)的輸出信號(hào)電壓范圍為0～10V而變頻器的輸入電壓信號(hào)范圍為0～5V時(shí)），需采用串聯(lián)電阻的方式進(jìn)行分壓，以保證兩者在正常電壓范圍內(nèi)

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(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，對(duì)控制信號(hào)采取適當(dāng)?shù)钠帘未胧?。常用的方式就是采用屏蔽電纜進(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、控電纜分開布線。實(shí)際連線時(shí)，注意主、控電纜分開布線，且相隔的距離。以保證主電路側(cè)的干擾及噪音影響不到控制電路。

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