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IC697ALG441

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最后更新: 2018-08-21 09:57:03
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    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(dòng)時(shí),是要加制動(dòng)的,起動(dòng)完成后一瞬間再松開制動(dòng)。在這種情況下運(yùn)行電流有時(shí)候會(huì)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(dòng)時(shí),仍是要加制動(dòng)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(dòng)。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(huì)過流。在生產(chǎn)中,裝載的物料有時(shí)可能會(huì)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(tái)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(duì)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(duì)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(hào)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(duì)應(yīng)輸出+108°與-108°時(shí)的+10V和-10V的模擬電壓信號(hào),變頻器接收±10V作為正反轉(zhuǎn)運(yùn)行信號(hào)。

    (4)利用原凸輪控制器控制制動(dòng)油路系統(tǒng),在凸輪控制器上中心點(diǎn)到相對(duì)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(dòng)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(shí)別到角位的變化,對(duì)應(yīng)角位變送器就會(huì)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(dòng)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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