A20B-8100-0662,,A20B-8100-0662,A20B-8100-0662
用FX PLC控制三相異步電動機(jī)的啟動與正反轉(zhuǎn)
程序設(shè)計(jì)
圖3為電機(jī)啟動控制的梯形圖。簡單啟動控制只用到正轉(zhuǎn)按鈕、停止按鈕兩個輸入端,輸出只用到KM1交流接觸器。該程序采用典型的自保持電路。合上電源刀開關(guān)通電后,停止按鈕接通,PLC內(nèi)部輸入繼電器X0的動合觸點(diǎn)閉合。按正轉(zhuǎn)按鈕,輸出繼電器Y0導(dǎo)通,交流接觸器KM1線圈帶電,其連接在主控回路的主觸點(diǎn)閉合,電機(jī)通電轉(zhuǎn)動,同時Y0的動合觸點(diǎn)閉合,實(shí)現(xiàn)自鎖。這樣,即使松開正轉(zhuǎn)按鈕,仍保持Y0導(dǎo)通。按停止按鈕,X0斷開,Y0斷開,KM1線圈失電,主控回路的主觸點(diǎn)斷開,電機(jī)失電而停轉(zhuǎn)。
圖4為電機(jī)正反轉(zhuǎn)控制程序,采用自鎖和互鎖控制程序。也可以采用SET和RST指令來實(shí)現(xiàn)。
在圖2的接線圖中,將兩個交流接觸器的動斷觸點(diǎn)KM1、KM2分別連接在KM2、KM1的線圈回路中,形成硬件互鎖,從而保證即使在控制程序錯誤或因PLC受到噪聲的影響而導(dǎo)致Y0、Y1兩個輸出繼電器同時有輸出的情況下避免正、反轉(zhuǎn)接觸器同時帶電而造成的主電路短路。
由于停止按鈕采用動斷按鈕,在通電后,X0動合觸點(diǎn)閉合。若先按正轉(zhuǎn)按鈕X1,Y0導(dǎo)通并形成自鎖。同時,Y0的動斷觸點(diǎn)斷開,即使按反轉(zhuǎn)按鈕Y1也無法接通,也就無法實(shí)現(xiàn)反轉(zhuǎn)。
在正轉(zhuǎn)的情況下,要想實(shí)現(xiàn)反轉(zhuǎn),只有先按一下停止按鈕,使Y0失電,從而正轉(zhuǎn)接觸器斷電,即使松開停止按鈕Y0、Y1仍失電。再按反轉(zhuǎn)按鈕后,由于Y0失電,其動斷觸點(diǎn)閉合,Y1導(dǎo)通,反轉(zhuǎn)接觸器KM2線圈帶電。接在圖1主控回路中主觸點(diǎn)閉合,由于電源相序變化,電機(jī)反轉(zhuǎn)。
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