IC697ALG441
IC697ALG441
IC697ALG441
原系統(tǒng)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(diào)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(zhuǎn)狀態(tài)，但由于輸出頻率低，輸出電壓也低，電機不會過流。在生產(chǎn)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(tǒng)的改造按以下幾個步驟進行：
（1）變頻系統(tǒng)操作時和原來工頻系統(tǒng)在設備狀態(tài)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(diào)節(jié)轉(zhuǎn)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(zhuǎn)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(jù)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(zhuǎn)運行信號。
（4）利用原凸輪控制器控制制動油路系統(tǒng)，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(tǒng)觸點時，自整角機已經(jīng)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(tǒng)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(tǒng)就處于制動狀態(tài)，通過變頻器內(nèi)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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