描述
繼傳統(tǒng)的接觸器、繼電器等電氣控制系統(tǒng)之后，性能強(qiáng)大、功能豐富的工控裝置PLC（可編程控制器）成為當(dāng)下電工技術(shù)的新寵，用廖常初老師的話講——現(xiàn)在的電工工作人員如果專業(yè)知識(shí)架構(gòu)中，沒有一定的變頻器、PLC等工控裝置的技術(shù)儲(chǔ)備，幾乎是無法勝任本職工作的！那么今天我們就來聊一下PLC電源用線方面的相關(guān)知識(shí)，大家可不要小看這個(gè)問題，要知道實(shí)際工作中PLC發(fā)生死機(jī)、誤動(dòng)作等故障現(xiàn)象，有近一半的原因正是由于PLC電源質(zhì)量欠佳所造成的！
①、PLC的供電電源線應(yīng)取自電壓較穩(wěn)定的干線或單獨(dú)引自配電點(diǎn)，以此來確保PLC供電質(zhì)量。如果電網(wǎng)電壓波動(dòng)較大（如含有大功率負(fù)載），應(yīng)考慮加裝具有穩(wěn)壓功能的UPS裝置。
②、PLC的電源線最好采用具有一定抗干擾能力的雙絞線，其截面不應(yīng)低于2mm2（部分歐美機(jī)型要求不得低于4mm2）。此外在配線過程中，PLC的I/O、負(fù)載等應(yīng)盡可能單獨(dú)的電源線供電，不得從PLC電源輸入線上并接。
③、當(dāng)電源中噪聲過大時(shí)（多由于電網(wǎng)內(nèi)變頻器等裝置污染所致），對(duì)PLC供電應(yīng)采用隔離變壓器，阻止噪聲干擾進(jìn)入PLC。
④、在采用隔離變壓器和低通濾波器時(shí)，PLC電源線應(yīng)先經(jīng)隔離變壓器→低通濾波器后再接入PLC。若所用隔離變壓器采用雙隔離技術(shù)時(shí)，一次側(cè)屏蔽層應(yīng)接中線，以便隔離進(jìn)線端的電磁干擾；二次側(cè)屏蔽層與PLC系統(tǒng)控制柜要共地連接，同時(shí)隔離變壓器二次側(cè)輸出線不得接地！
⑤、為防止電網(wǎng)的浪涌過電壓竄入PLC造成其損壞，可在PLC的電源輸入端接入壓敏電阻、浪涌保護(hù)器等吸收過電壓元器件，并使所用元器件的接地端和PLC的接地線分開接地。
產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢(shì)價(jià)格，大量現(xiàn)貨。
主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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