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IC697ALG441
IC697ALG441 價格:100  元(人民幣) 產地:美國
最少起訂量:1 發貨地:福建廈門
上架時間:2018-08-21 09:57:03 瀏覽量:129
廈門光沃自動化設備有限公司  
經營模式:經銷商 公司類型:其他有限責任公司
所屬行業:PLC控制系統 主要客戶:全國市場
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IC697ALG441

IC697ALG441

IC697ALG441


原系統電機是185kW的6極繞線式電機,在平時工作電流在280-380A,為保證安全,提升機上行或下行起動時,是要加制動的,起動完成后一瞬間再松開制動。在這種情況下運行電流有時候會超過電機額定電流,達到400多安培。變頻調速后,提升機上行或下行起動時,仍是要加制動的,變頻器輸出頻率到0.3Hz有足夠大的力矩時再松開制動。盡管0.3Hz以下電機處于堵轉狀態,但由于輸出頻率低,輸出電壓也低,電機不會過流。在生產中,裝載的物料有時可能會超載,考慮重載加速時間短,選型時變頻器容量需要加大,本例變頻器為280kW,這樣有利于電機在過載時候變頻器有足夠的過載能力。

原有提升機系統的改造按以下幾個步驟進行:

(1)變頻系統操作時和原來工頻系統在設備狀態上有所不同,在提升機控制臺上有個凸輪控制器,(其作用是利用控制器的多接點當作提升機的檔位控制接觸器,調節轉子電阻的阻值大小,對應低高速檔。)除開油路部分的控制觸點以外的所有接點彈簧全部已被去掉,這樣有利于在使用角位控制時候減少操作阻力。

(2)再將繞線式電機的轉子繞組全部短接。

(3)利用原來的凸輪控制器,在凸輪控制器的后方軸上安裝自整角機,與凸輪控制器的中心軸同心,這樣利用原來上升和下放的操作模式。對應凸輪控制器的正負角度,分別角度是108°和-108°,自整角機把這個角位信號以脈沖形式送給角位變送器,角位變送器再根據正負角度對應輸出+108°與-108°時的+10V和-10V的模擬電壓信號,變頻器接收±10V作為正反轉運行信號。

(4)利用原凸輪控制器控制制動油路系統,在凸輪控制器上中心點到相對應兩邊第一個觸頭須使用。度過兩邊的觸點后,隨著操縱桿的推動平滑地過渡到±108°。在操縱桿未打到油路系統觸點時,自整角機已經識別到角位的變化,對應角位變送器就會有正負電壓的輸出,因為在油路系統未打開之前變頻器是有很低的頻率輸出(0~0.3Hz)。油路未打開剎車系統就處于制動狀態,通過變頻器內部的邏輯單元、算術單元和比較器等相關功能進行設置,過渡了兩個接觸點的清零位置,使得在操縱桿在過油路觸點時候變頻器在0.2Hz以下運行,得到非常好的控制效果。

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