描述
J0繼電器與R1、C1組成點動控制電路,它受K1~K3這3個按鈕控制,這3個按鈕為點動按鈕,其按下時間應大于1秒:如按下K1按鈕,使J0支路通導,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的常閉觸點斷開,使J1~J3支路失電斷開。隨之J0的內阻對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0.5秒,J0的電壓低于其最小吸合電壓時,J0斷開,其常閉觸點閉合(使24V又加在J1~J3的上端),由于此時K1仍處于按下(即閉合)狀態(tài),故使J1繼電器得電吸合自鎖(即使第一個調壓器工作)。延時1秒后,K1按鈕抬起,使J0支路斷電,C1此時將通過并聯電阻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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