描述

1X00781H01L

我的分析是這樣的，過流過壓在直流調(diào)速器上的反應(yīng)，都是輸出不穩(wěn)定，脈沖缺失的保護(hù)，正好對(duì)應(yīng)了輸出不穩(wěn)定故障。根據(jù)維修abbdcs系列調(diào)速器的經(jīng)驗(yàn)，輸出不穩(wěn)定，還得分重載和輕載??？如果重載輸出不穩(wěn)定，一般故障出在功率驅(qū)動(dòng)前后級(jí)或功率模組；如果輕載重載輸出都不穩(wěn)定，（甚至飛車）故障一般出在電機(jī)反饋電路。由于客戶現(xiàn)場(chǎng)使用電機(jī)較大，達(dá)幾百個(gè)千瓦，電話聯(lián)系時(shí)，我確定了馬達(dá)碳刷沒有打火，且故障機(jī)原來一直使用中，故障出現(xiàn)后，不管輕載還是重載，電樞電流都波動(dòng)很大。于是建議客戶送修。（因?yàn)楹焙系綇V東，現(xiàn)在高鐵還是很方便的）

修復(fù)檢測(cè)電路，運(yùn)行試機(jī)，輕載正常。但輕載輸出正常，并不代表輸出就正常了，脈沖丟失同樣輕載正常且轉(zhuǎn)速均勻有力。這時(shí)要調(diào)試軟件，將勵(lì)磁禁止，啟動(dòng)，監(jiān)控0911參數(shù)，提示321dd，同時(shí)調(diào)速器跳出f517故障。根據(jù)診斷提示，確定脈沖驅(qū)動(dòng)組，用示波器測(cè)輸出脈沖，果然v相模塊上橋無驅(qū)動(dòng)脈沖。，這就好辦了，可以根據(jù)故障點(diǎn)反向查找，最后確認(rèn)主控板驅(qū)動(dòng)三極管性能不良！換新，故障排除。
總體來說，abbdcs系列直流調(diào)速器維修大同小異，不同點(diǎn)在不同的軟件應(yīng)用。Abb本身提供的軟件，是非常強(qiáng)大的，很多故障，通過面板監(jiān)控、診斷提示，是可以快速找到故障點(diǎn)的。作為維修工程師，說時(shí)間就是金錢，一點(diǎn)也不夸張。特別是有用戶在現(xiàn)場(chǎng)等待（或現(xiàn)場(chǎng)維修），先了解abb產(chǎn)品的應(yīng)用程序，是很關(guān)鍵的。

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