TU890 3BSC690075R1
TU890 3BSC690075R1
TU890 3BSC690075R1
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)周圍電氣設(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、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。
4 結(jié)束語(yǔ)
變頻器和P L C 間連接問(wèn)題,涉及到數(shù)字量信號(hào)連接、模擬量信號(hào)連接以及避免干擾應(yīng)注意的問(wèn)題;在實(shí)際應(yīng)用中,兩者間的連接還涉及到用弱電信號(hào)控制強(qiáng)電的問(wèn)題。因此,應(yīng)引起重視,避免干擾造成變頻器、PLC 的誤動(dòng)作;避免連接不當(dāng)造成PLC 或變頻器的損壞。
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