描述
電動機可逆運行控制電路的調(diào)試
1、檢查主回路路的接線是否正確,為了保證兩個接觸器動作時能夠可靠調(diào)換電動機的相序,接線時應(yīng)使接觸器的上口接線保持一致,在接觸器的下口調(diào)相。
2、檢查接線無誤后,通電試驗,通電試驗時為防止意外,應(yīng)先將電動機的接線斷開。
故障現(xiàn)象預(yù)處理;
1、不啟動;原因之一,檢查控制保險FU是否斷路,熱繼電器FR接點是否用錯或接觸不良,SB1按鈕的常閉接點是否不良。原因之二按紐互鎖的接線有誤。
2、起動時接觸器“叭噠”就不吸了;這是因為接觸器的常閉接點互鎖接線有錯,將互鎖接點接成了自己鎖自己了,起動時常閉接點是通的接觸器線圈的電吸合,接觸器吸合后常閉接點又?jǐn)嚅_,接觸器線圈又?jǐn)嚯娽尫?,釋放常閉接點又接通接觸器又吸合,接點又?jǐn)嚅_,所以會出現(xiàn)“叭噠”接觸器不吸合的現(xiàn)象。
3、不能夠自鎖一抬手接觸器就斷開,這是因為自鎖接點接線有誤。
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