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咨詢(xún)她——張工
PLC卡件—125840-01.
PLC卡件—125840-01.
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【自始ZI終,*】
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【低價(jià)縱橫,舉世矚目】
PLC與變頻器連接問(wèn)題分析
PLC開(kāi)關(guān)指令信號(hào)輸入
變頻器輸入信號(hào)中包括對(duì)運(yùn)行/停止、正轉(zhuǎn)/反轉(zhuǎn)、微動(dòng)等運(yùn)行狀態(tài)進(jìn)行作業(yè)開(kāi)關(guān)型指令信號(hào)。變頻器通常利用繼電器接點(diǎn)或具有繼電器接點(diǎn)開(kāi)關(guān)特性元器件(如晶體管)與PLC)相連,到運(yùn)行狀態(tài)指令。
使用繼電器接點(diǎn)時(shí),常常接觸不良而帶來(lái)誤動(dòng)作;使用晶體管進(jìn)行連接時(shí),則需考慮晶體管本身電壓、電流容量等因素,保證系統(tǒng)可靠性。
設(shè)計(jì)變頻器輸入信號(hào)電路時(shí)還應(yīng)該注意,當(dāng)輸入信號(hào)電路連接不當(dāng)時(shí)也會(huì)造成變頻器誤動(dòng)作。例如,當(dāng)輸入信號(hào)電路采用繼電器等感性負(fù)載時(shí),繼電器開(kāi)閉產(chǎn)生浪涌電流帶來(lái)噪音有可能引起變頻器誤動(dòng)作,應(yīng)盡量避免。
當(dāng)輸入開(kāi)關(guān)信號(hào)進(jìn)入變頻器時(shí),會(huì)發(fā)生外部電源和變頻器控制電源(DC24V)之間串?dāng)_。正確連接是利用PLC電源,將外部晶體管集電極二極管接到PLC。
Applied Materials AMAT 0150-03314
Applied Materials AMAT 0150-03321
Applied Materials AMAT 0150-03321
Applied Materials AMAT 0150-03322
Applied Materials AMAT 0150-03326
Applied Materials AMAT 0150-03326
Applied Materials AMAT 0150-03348
Applied Materials AMAT 0150-03409
Applied Materials AMAT 0150-03447
Applied Materials AMAT 0150-03447
Applied Materials AMAT 0150-03447
Applied Materials AMAT 0150-03447
Applied Materials AMAT 0150-03457
Applied Materials AMAT 0150-03457
Applied Materials AMAT 0150-03457
Applied Materials AMAT 0150-03471
Applied Materials AMAT 0150-03471
Applied Materials AMAT 0150-03578
Applied Materials AMAT 0150-03585
Applied Materials AMAT 0150-03598
Applied Materials AMAT 0150-03644
Applied Materials AMAT 0150-03648
Applied Materials AMAT 0150-03711
Applied Materials AMAT 0150-03719
Applied Materials AMAT 0150-03730
Applied Materials AMAT 0150-03732
Applied Materials AMAT 0150-03732
Applied Materials AMAT 0150-03815
Applied Materials AMAT 0150-03825
Applied Materials AMAT 0150-03907
Applied Materials AMAT 0150-03907
Applied Materials AMAT 0150-03907
Applied Materials AMAT 0150-03907
Applied Materials AMAT 0150-03907