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A20B-3900-0170
A20B-3900-0170
產品價格:¥456(人民幣)
  • 規格:A20B-3900-0170
  • 發貨地:廈門
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  • 最小起訂量:1臺
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    會員級別:鉆石會員
    認證類型:企業認證
    企業證件:通過認證

    商鋪名稱:廈門順祺偉業商貿有限公司

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    商品詳情

      A20B-3900-0170,A20B-3900-0170,A20B-3900-0170

      用FX PLC控制三相異步電動機的啟動與正反轉

      程序設計

      圖3為電機啟動控制的梯形圖。簡單啟動控制只用到正轉按鈕、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。合上電源刀開關通電后,停止按鈕接通,PLC內部輸入繼電器X0的動合觸點閉合。按正轉按鈕,輸出繼電器Y0導通,交流接觸器KM1線圈帶電,其連接在主控回路的主觸點閉合,電機通電轉動,同時Y0的動合觸點閉合,實現自鎖。這樣,即使松開正轉按鈕,仍保持Y0導通。按停止按鈕,X0斷開,Y0斷開,KM1線圈失電,主控回路的主觸點斷開,電機失電而停轉。

      圖4為電機正反轉控制程序,采用自鎖和互鎖控制程序。也可以采用SET和RST指令來實現。

      在圖2的接線圖中,將兩個交流接觸器的動斷觸點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致Y0、Y1兩個輸出繼電器同時有輸出的情況下避免正、反轉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動合觸點閉合。若先按正轉按鈕X1,Y0導通并形成自鎖。同時,Y0的動斷觸點斷開,即使按反轉按鈕Y1也無法接通,也就無法實現反轉。

      在正轉的情況下,要想實現反轉,只有先按一下停止按鈕,使Y0失電,從而正轉接觸器斷電,即使松開停止按鈕Y0、Y1仍失電。再按反轉按鈕后,由于Y0失電,其動斷觸點閉合,Y1導通,反轉接觸器KM2線圈帶電。接在圖1主控回路中主觸點閉合,由于電源相序變化,電機反轉。


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