A-B 1783-ETAP-2F系統(tǒng)控制連鎖點(diǎn)較多，在運(yùn)行中多次出現(xiàn)自動(dòng)停機(jī)（跳閘）現(xiàn)象，間隔時(shí)間長達(dá)2天，1天，短的為2小時(shí)

，8分鐘，故障點(diǎn)很隱蔽，經(jīng)過全面的檢查和分析，發(fā)現(xiàn)控制連鎖電路中有一個(gè)保險(xiǎn)管接觸不良，因無國外同

型號(hào)，長度的保險(xiǎn)管，替代器件短造成接觸不良，排除后此類故障大為減少，創(chuàng)造了連續(xù)運(yùn)行600小時(shí)不停機(jī)

的紀(jì)錄。

（2）過載檢測故障：檢查電機(jī)繞組絕緣，逆變橋電路和過載檢測電路即可。

（3）速度設(shè)置不當(dāng)：如果電機(jī)轉(zhuǎn)速在最高速左右時(shí)，檢查速度限定和跳閘電路。

（4）勵(lì)磁不正常：在工作中，由于勵(lì)磁電路工作不正常，造成跳閘和不能啟動(dòng)的次數(shù)較多，經(jīng)檢查發(fā)現(xiàn)

勵(lì)磁傳輸電路有故障，維修后此類故障不再出現(xiàn)。

（5）電源故障：現(xiàn)場安裝的電壓記錄儀表明，多次供電異常（低壓低于165V），導(dǎo)致控制電路失控而停

機(jī)。由于現(xiàn)場的電網(wǎng)存在供電不平穩(wěn)的實(shí)際情況，較大的電壓波動(dòng)無法避免，因此控制系統(tǒng)只能在保護(hù)上盡可

能完善，不能避免停機(jī)現(xiàn)象。

（6）跳閘電路故障：檢查方法同前。

2.4無輸出

當(dāng)系統(tǒng)自檢正常，啟動(dòng)后卻沒有輸出，同步電機(jī)不工作，這種故障可從以下幾個(gè)方面入手進(jìn)行檢查。查看

系統(tǒng)自檢指示燈狀態(tài)，確定停機(jī)原因；檢查功率部分的觸發(fā)電路有否電源和觸發(fā)脈沖；檢查勵(lì)磁控制器；對(duì)控

制器中的觸發(fā)電路，速度控制電路和控制狀態(tài)進(jìn)行檢查。

2.5無規(guī)律的跳閘

無規(guī)律的跳閘通常是由于系統(tǒng)接線，設(shè)定不當(dāng)，器件老化等原因引起的，應(yīng)在堅(jiān)持月維護(hù)的基礎(chǔ)上，按要

求進(jìn)行大修維護(hù)，進(jìn)行整體檢查和清洗工作，保證無接觸不良和老化故障。

2.6不能正常加減速

這種現(xiàn)象通常由于以下幾個(gè)原因引起的：模式轉(zhuǎn)換電路工作異常，速度編碼器故障和勵(lì)磁電路故障。模式

轉(zhuǎn)換電路工作異常可進(jìn)一步結(jié)合前面的變頻器不能啟動(dòng)和連續(xù)過電流檢測來做判斷。速度編碼器故障可從現(xiàn)場

和中控室的儀表或轉(zhuǎn)速計(jì)來檢查，由于速度編碼器比較復(fù)雜，維修前必須確認(rèn)。勵(lì)磁電路故障檢查方法同前。

3結(jié)束語

以上的高壓大功率變頻調(diào)速器的常見故障分析及其維護(hù)是結(jié)合GBC工業(yè)控制有限公司的控制電路和現(xiàn)場維

護(hù)經(jīng)驗(yàn)，總結(jié)出來的一些體會(huì)。
廈門興銳達(dá)自動(dòng)化設(shè)備有限公司 

聯(lián)系人：劉錦玲 銷售經(jīng)理 
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