廈門市泰尼電器有限公司
主營產品: AB模塊PLC |
廈門市泰尼電器有限公司
主營產品: AB模塊PLC |
參考價 | 面議 |
檢查多支路自動控制電路的故障:在多支路自動控制降壓啟動電路(圖6),啟動時,定子繞組上串聯電阻R,限制了啟動電流。在電動機上升到一定數值時,時間繼電器KT動作,常開觸點閉合,接通KM2電路,啟動電阻R自動短接,電動機正常運行。如果按下啟動按鈕SB1,接觸器不吸合,可將KM1強迫閉合,松開后看KM1是否保持在吸合位置,電動機在強迫閉合瞬間是否啟動。如果KM1隨絕緣棒松開而釋放,但電動機轉動了,則故障在停止按鈕SB2熱繼電器FR觸點或KM1本身。如電動機不轉,故障在主電路熔斷器、電源無電壓等。如KMI不再釋放,電動機正常運轉,故障在啟動按鈕SBl和KM1的自鎖觸點。
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