EEA-PAM-513-B-30
EEA-PAM-513-B-30EEA-PAM-513-B-30
程序邏輯推斷
現(xiàn)在工業(yè)上經(jīng)常使用的PLC種類繁多,對(duì)于低端的PLC而言,梯形圖指令大同小異,對(duì)于 中高端機(jī),如S7-300,許多程序是用語言表編的。實(shí)用的梯形圖必須有中文符號(hào)注解,否則 閱讀很困難,看梯形圖前如能大概了解設(shè)備工藝或操作過程 ,看起來比較容易。若進(jìn)行電 氣故障分析,一般是應(yīng)用反查法或稱反推法,即根據(jù)輸入輸出對(duì)應(yīng)表,從故障點(diǎn)找到對(duì)應(yīng)PL C的輸出繼電器,開始反查滿足其動(dòng)作的邏輯關(guān)系。經(jīng)驗(yàn)表明,查到一處問題,故障基本可 以排除,因?yàn)樵O(shè)備同時(shí)發(fā)生兩起及兩起以上的故障點(diǎn)是不多的。
【公 司】: 廈門泰尼電氣有限公司
【主 營(yíng)】: AB、GE、施耐德等各類PLC產(chǎn)品
【價(jià) 格】: 電議
【發(fā)布人】: 張亮
【電 話】: 18030028083
【所在地】: 福建 - 廈門
【座 機(jī)】: 0592-6809819
【來 源】: 供應(yīng)信息 > 電工、電氣 > PLC
【Q Q】: 2314094943
5 PLC自身故障判斷
一般來說,PLC是極其可靠的設(shè)備,出故障率很低,但由于外部原因,也可導(dǎo)致PLC損壞 。
5.1 一只工作電源為220V的接近開關(guān),其輸入PLC信號(hào)觸點(diǎn)兩根引線與接近開關(guān)的220V的電 源線共用一根4 芯電纜,一次該接近開關(guān)損壞,電工更換時(shí),錯(cuò)把電源的零線與輸入的PLC 的公共線調(diào)錯(cuò),導(dǎo)致送電時(shí)燒壞了3路PLC輸入點(diǎn)。
5.2 一次系統(tǒng)電源變壓器零線排因腐蝕而中斷,導(dǎo)致接入PLC220V電源升到380V,燒壞了PL C底部的電源模塊,后整改時(shí)增加了380/220V的隔離控制變壓器。
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