SEW變頻器散熱片過熱(oh1)故障原因分析及處理
oh1也是一種比較常見的故障，主要原因：檢查檢查變頻器控制端子(13、12、11)之間是否短路；檢查溫度傳感器檢測電路是否正常；另外還應檢查變頻器的冷卻風扇運行是否正常；散熱片通風情況，散熱片是否有堵塞現象；周圍環境溫度是否過高。
實例：一臺SEW變頻器 ，上電顯示散熱片過熱(oh1)。
分析與維修：因為是新安裝變頻器，一送電后就有故障，所以變頻器壞的可能性不大；散熱片是無堵塞現象；冷卻風扇運行正常。斷電后，用萬用表測試模擬量輸入回路，檢查變頻器控制端子(13、12、11)之間短路，原因是模擬量輸入回路中外接頻率設定“電位器”電阻值過小所致，更換為wxwxx0.25-1，0.25w 47～4.7k電位器，上電開機后變頻器運行良好，運行中沒有再發生此故障。
變頻器內過熱(oh3)故障原因分析及處理
oh3也是一種比較常見的故障，主要原因：負載是否過大； 變頻器溫度過高故障，如發生溫度過高報警，經檢查溫度傳感器正常，則可能是干擾引起的，可以把故障屏蔽。另外還應檢查變頻器的冷卻風扇及散熱片通風情況，更換堵轉冷卻風扇，轉動慢風機進行修復，清掃變頻器，消除散熱片堵塞；周圍環境溫度是否過高，降低周圍環境溫度。對于其它類型的故障，*好與廠家聯系，獲得快速可行的解決方法。
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