A06B-0128-B588#0075在試驗(yàn)當(dāng)中,當(dāng)其中一部電機(jī)處于起動(dòng)狀態(tài)時(shí),首先應(yīng)該接通這部電機(jī)的接觸器Y1或者Y2,然后接通變頻器的正轉(zhuǎn)信號(hào)Y3,最后通過4DA輸出一個(gè)電流或電流模擬量來接通4YA,即實(shí)現(xiàn)液壓系統(tǒng)的加載。當(dāng)這部電機(jī)停止時(shí),首先將4DA的輸出量設(shè)為零,實(shí)現(xiàn)液壓系統(tǒng)的卸載,然后斷開變頻器正轉(zhuǎn)信號(hào)Y3,最后斷開連接這部電機(jī)的接觸器Y1或Y2.此外,為了保證系統(tǒng)更好的運(yùn)行,還可以同時(shí)設(shè)定一定的時(shí)間用于兩部電機(jī)都停止運(yùn)行的中間過渡過程,在這期間可以斷開電磁鐵2YA和3YA,使電磁方向閥16處于斷電狀態(tài)而位于中位,也即達(dá)到自鎖狀態(tài)而保持了系統(tǒng)的液壓壓力不變或者降低很少。這樣做的好處在于使得此電磁閥在長(zhǎng)時(shí)間的試驗(yàn)當(dāng)中能夠獲得一定的休息時(shí)間,不會(huì)因?yàn)殚L(zhǎng)久通電導(dǎo)致線圈過熱產(chǎn)生故障。在PLC程序當(dāng)中,這3點(diǎn)的開停邏輯關(guān)系主要通過定時(shí)器來實(shí)現(xiàn)。
A06B-0128-B588#0075當(dāng)輪胎在試驗(yàn)過程中發(fā)生故障時(shí),輪胎會(huì)自動(dòng)后退。根據(jù)現(xiàn)場(chǎng)調(diào)試的實(shí)際情況,在PLC中通過定時(shí)器設(shè)置發(fā)生故障時(shí)刻之后5s,電磁鐵1YA自動(dòng)通電,電磁換向閥7處在左位狀態(tài),此時(shí)剎車起作用,輪胎被緊急制動(dòng)。再設(shè)置當(dāng)故障時(shí)刻發(fā)生之后10s,此時(shí)輪胎已完全停止轉(zhuǎn)動(dòng),再設(shè)置電磁鐵1A06B-0128-B588#0075YA斷電,此時(shí)液壓缸被換向后的液壓推向相反方向,剎車松開。
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