描述
如果系統(tǒng)處于單步工作方式,X2為ON,它的常閉觸點(diǎn)斷開(kāi),“轉(zhuǎn)換允許”輔助繼電器M2在一般情況下為OFF,不允許步與步之間的轉(zhuǎn)換。設(shè)系統(tǒng)處于初始狀態(tài),M10為ON,按下起動(dòng)按鈕X5,M2變?yōu)镺N,使M11為ON,系統(tǒng)進(jìn)入下降步。放開(kāi)起動(dòng)按鈕后,M2馬上變?yōu)镺FF。在下降步,YO的得電,機(jī)械手降到下限位開(kāi)關(guān)X11處時(shí),與YO的線圈串聯(lián)的X11的常閉觸點(diǎn)斷開(kāi),使YO的線圈斷電,機(jī)械手停止下降。X11的常開(kāi)觸點(diǎn)閉合后,如果沒(méi)有按起動(dòng)按鈕,X5和M2處于OFF狀態(tài),一直要等到按下起動(dòng)按鈕,M5和M2變?yōu)镺N,M2的常開(kāi)觸點(diǎn)接通,轉(zhuǎn)換條件X11才能使M12接通,M12得電并自保持,系統(tǒng)才能由下降步進(jìn)入夾緊步。以后在完成某一步的操作后,都必須按一次起動(dòng)按鈕,系統(tǒng)才能進(jìn)入下一步。
在輸出程序部分,X10~X13的常閉觸點(diǎn)是為單步工作方式設(shè)置的。以下降為例,當(dāng)小車(chē)碰到限位開(kāi)關(guān)X11后,與下降步對(duì)應(yīng)的輔助繼電器M11不會(huì)馬上變?yōu)镺FF,如果YO的線圈不與X11的常閉觸點(diǎn)串聯(lián),機(jī)械手不能停在下限位開(kāi)關(guān)X11處,還會(huì)繼續(xù)下降,這種情況下可能造成事故。
(4)回原點(diǎn)程序如圖9所示為機(jī)械手自動(dòng)回原點(diǎn)程序的梯形圖。在回原點(diǎn)工作方式(X1為ON),按下回原點(diǎn)起動(dòng)按鈕X7,M3變?yōu)镺N,機(jī)械手松開(kāi)和上升,升到上限位開(kāi)關(guān)時(shí)X10為0N,機(jī)械手左行,到左限位處時(shí),X12變?yōu)镺N,左行停止并將M3復(fù)位。這時(shí)原點(diǎn)條件滿(mǎn)足,M0為ON,在公用程序中,初始步M0被置位,為進(jìn)入單周期、連續(xù)和單步工作方式作好了準(zhǔn)備。
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