描述
J0繼電器與R1、C1組成點(diǎn)動控制電路,它受K1~K3這3個(gè)按鈕控制,這3個(gè)按鈕為點(diǎn)動按鈕,其按下時(shí)間應(yīng)大于1秒:如按下K1按鈕,使J0支路通導(dǎo),由于C1要保持原通電前0V電壓不變,故瞬間使J0電壓=24V,使J0立刻吸合,其J0的常閉觸點(diǎn)斷開,使J1~J3支路失電斷開。隨之J0的內(nèi)阻對C1充電,使C1電壓由0增加,則又會使J0的電壓由24V下降,延時(shí)0.5秒,J0的電壓低于其最小吸合電壓時(shí),J0斷開,其常閉觸點(diǎn)閉合(使24V又加在J1~J3的上端),由于此時(shí)K1仍處于按下(即閉合)狀態(tài),故使J1繼電器得電吸合自鎖(即使第一個(gè)調(diào)壓器工作)。延時(shí)1秒后,K1按鈕抬起,使J0支路斷電,C1此時(shí)將通過并聯(lián)電阻R1放電,直至C1電壓=0.。即K1的抬起過程對J0無影響。
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