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當按下啟動按鈕SB1，KM1吸合，時間繼電器KT不吸合。故障在時間繼電器線圈電路或其機械部分。如時間繼電器吸合，但KM2不吸合，可用小螺絲刀按壓KT上的微動開關(guān)觸桿，注意聽是否有開關(guān)動作的聲音，如有聲音且電動機正常運行，說明微動開關(guān)裝配不正確。
    6.短接法
    設(shè)備電路或電器的故障大致歸納為短路、過載、斷路、接地、接線錯誤、電器的電磁及機械部分故障等六類。諸類故障中出現(xiàn)較多的為斷路故障。它包括導(dǎo)線斷路、虛連、松動、觸點接觸不良、虛焊、假焊、熔斷器熔斷等。對這類故障除用電阻法、電壓法檢查外，還有一種更為簡單可靠的方法，就是短接法。方法是用一根良好絕緣的導(dǎo)線，將所懷疑的斷路部位短路接起來，如短接到某處，電路工作恢復(fù)正常，說明該處斷路。具體操作可分為局部短接法和長短接法。

：張亮（工程師）    專線：
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