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熱繼電器的故障及維修

發布日期:2022-05-30 點擊率:35

  ①熱功當量元件燒斷,若不能起動或起動時有嗡嗡聲,可能是的熱元件中的熔斷絲燒斷。此類故障的原因是熱繼電器的動作頻率太高,或負載側發生過載。排除故障后,更換合適的熱繼電器,重新調整整定值。

 ?、跓崂^電器“誤”動作。這種故障原因一般有以下幾種:整定值偏小,以致來過載就動作;電動機起動時間過長,使熱繼電器在起動過程中動作;操作頻率過高,使熱元件經常受到沖擊。以上問題通過重新調整整定值或更換適合的熱繼電器可以解決。

 ?、蹮崂^電器“不”動作。這種故障通常是電流整定值偏大,以致過載很久仍不動作,應根據負載工作電流調整整定電流。

  ④熱繼電器使用較長時間后,應該定期校驗它的動作可靠性。當熱繼電器動作脫扣時,應待雙金屬片冷卻后再復位。按復位按鈕用力不可過猛,否則會損壞操作機構。


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