140AMM09000C集成架
對(duì)機(jī)械設(shè)備的傷害
全壓直接起動(dòng)時(shí)的起動(dòng)轉(zhuǎn)矩大約為額定轉(zhuǎn)矩的2倍，這么大的力矩突然加在靜止的機(jī)械設(shè)備上，會(huì)加速齒輪磨損甚至打齒、加速皮帶磨損甚至拉斷皮帶、加速風(fēng)葉疲勞甚至折斷風(fēng)葉等等。
軟起動(dòng)的轉(zhuǎn)矩不會(huì)超過(guò)額定轉(zhuǎn)矩，上述弊端可以克服。
當(dāng)采用減壓起動(dòng)時(shí)，上述危害只有程度的降低；當(dāng)采用軟起動(dòng)時(shí)，上述危害幾乎消失；獨(dú)立變壓器供電方式直接起動(dòng)只能在電網(wǎng)電壓波動(dòng)方面有所緩解，而其它方面的危害都照樣存在。
超大型電動(dòng)機(jī)的價(jià)值都很高，在生產(chǎn)中也都起著核心作用。它的一點(diǎn)故障便會(huì)造成很大的經(jīng)濟(jì)損失，對(duì)它采用完善的保護(hù)是非常必要的。比如說(shuō)對(duì)一臺(tái)電機(jī)我們不能指望它的各處絕緣都是一致的，可能在某一點(diǎn)就有個(gè)薄弱環(huán)節(jié)，出廠試驗(yàn)時(shí)它能通過(guò)，但在長(zhǎng)時(shí)間的沖擊下這個(gè)薄弱環(huán)節(jié)會(huì)逐漸首先顯露出來(lái)，使其壽命縮短。如果我們采取軟起動(dòng)，則可以大大延長(zhǎng)電機(jī)的使用壽命，這兩種方案哪一個(gè)合算呢？這是顯而易見(jiàn)的。
開(kāi)關(guān)變壓器
當(dāng)今傳動(dòng)工程中常用的就是三相交流感應(yīng)電動(dòng)機(jī)。在許多場(chǎng)合中，由于其起動(dòng)特性，這些電動(dòng)機(jī)涌直接連接電源系統(tǒng)。如果直接在線起動(dòng)，將會(huì)產(chǎn)生高達(dá)電機(jī)額定電流6倍的浪涌電流。該電流會(huì)使供電系統(tǒng)和串聯(lián)的開(kāi)關(guān)設(shè)備過(guò)載。如果直接起動(dòng)，也會(huì)產(chǎn)生較高的峰值轉(zhuǎn)矩，這種沖擊不但會(huì)對(duì)驅(qū)動(dòng)電動(dòng)機(jī)產(chǎn)生沖擊，而且也會(huì)使用機(jī)械裝置受損。例如：輔助動(dòng)力傳送部（V形帶，齒輪）。為了降低直動(dòng)電流，應(yīng)使用起動(dòng)輔助裝置，如起動(dòng)用電抗器或自耦變壓器，但使用電抗器或自耦變壓器起動(dòng)等常規(guī)方法只能逐步降低電壓，而軟起動(dòng)器通過(guò)平滑升子電壓，可以實(shí)現(xiàn)無(wú)沖擊起動(dòng)。因此，可以佳地保護(hù)電源系統(tǒng)以及電機(jī)。
HPMV中、高壓軟起動(dòng)器是用多個(gè)可控硅串并聯(lián)而成，可以滿足不同的電流及電壓要求，控制可控硅的觸發(fā)角就可以控制輸出電壓的大小。當(dāng)電機(jī)起動(dòng)過(guò)程中，HPMV按照預(yù)先設(shè)定的起動(dòng)曲線增加電機(jī)的端電壓使電機(jī)平滑加速，從而減少了電機(jī)起動(dòng)時(shí)對(duì)電網(wǎng)、電機(jī)本身、相連設(shè)備的電氣及機(jī)械沖擊。當(dāng)電機(jī)達(dá)到正常轉(zhuǎn)速后，旁路接觸器接通。電機(jī)起動(dòng)完畢后，HPMV軟起動(dòng)器繼續(xù)監(jiān)控電機(jī)并提供故障保護(hù)。在軟停機(jī)時(shí)首先按照預(yù)先設(shè)定好的停機(jī)曲線平滑地降低電機(jī)的端電壓直到電機(jī)停機(jī)。軟?？梢越鉀Q突然停機(jī)引起的水泵水錘現(xiàn)象及機(jī)械沖擊等相關(guān)問(wèn)題。
HPMV中、高軟起動(dòng)器的操作過(guò)程可以分為四過(guò)程：起動(dòng)準(zhǔn)備完成、起動(dòng)過(guò)程、運(yùn)行和停機(jī)過(guò)程。CPU對(duì)所有的過(guò)程都提供的保護(hù)。
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