IC697ALG441
IC697ALG441
IC697ALG441
原系統(tǒng)電機(jī)是185kW的6極繞線式電機(jī)，在平時(shí)工作電流在280-380A，為保證安全，提升機(jī)上行或下行起動時(shí)，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(yùn)行電流有時(shí)候會超過電機(jī)額定電流，達(dá)到400多安培。變頻調(diào)速后，提升機(jī)上行或下行起動時(shí)，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(shí)再松開制動。盡管0.3Hz以下電機(jī)處于堵轉(zhuǎn)狀態(tài)，但由于輸出頻率低，輸出電壓也低，電機(jī)不會過流。在生產(chǎn)中，裝載的物料有時(shí)可能會超載，考慮重載加速時(shí)間短，選型時(shí)變頻器容量需要加大，本例變頻器為280kW，這樣有利于電機(jī)在過載時(shí)候變頻器有足夠的過載能力。
原有提升機(jī)系統(tǒng)的改造按以下幾個(gè)步驟進(jìn)行：
（1）變頻系統(tǒng)操作時(shí)和原來工頻系統(tǒng)在設(shè)備狀態(tài)上有所不同，在提升機(jī)控制臺上有個(gè)凸輪控制器，（其作用是利用控制器的多接點(diǎn)當(dāng)作提升機(jī)的檔位控制接觸器，調(diào)節(jié)轉(zhuǎn)子電阻的阻值大小，對應(yīng)低高速檔。）除開油路部分的控制觸點(diǎn)以外的所有接點(diǎn)彈簧全部已被去掉，這樣有利于在使用角位控制時(shí)候減少操作阻力。
（2）再將繞線式電機(jī)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(jī)，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(yīng)凸輪控制器的正負(fù)角度，分別角度是108°和-108°，自整角機(jī)把這個(gè)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(fù)角度對應(yīng)輸出+108°與-108°時(shí)的+10V和-10V的模擬電壓信號，變頻器接收±10V作為正反轉(zhuǎn)運(yùn)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(diǎn)到相對應(yīng)兩邊第一個(gè)觸頭須使用。度過兩邊的觸點(diǎn)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(diǎn)時(shí)，自整角機(jī)已經(jīng)識別到角位的變化，對應(yīng)角位變送器就會有正負(fù)電壓的輸出，因?yàn)樵谟吐废到y(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(shù)單元和比較器等相關(guān)功能進(jìn)行設(shè)置，過渡了兩個(gè)接觸點(diǎn)的清零位置，使得在操縱桿在過油路觸點(diǎn)時(shí)候變頻器在0.2Hz以下運(yùn)行，得到非常好的控制效果。
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