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通過軟啟動(dòng)器實(shí)現(xiàn)電機(jī)的軟啟動(dòng)需要考慮到如下的技術(shù)條件:
- 電機(jī)的轉(zhuǎn)矩分別與電機(jī)電流的平方和電壓的平方成正比
>>電機(jī)電流的減小會(huì)導(dǎo)致電機(jī)轉(zhuǎn)矩不成比例的更多的減小并且斜坡軟啟動(dòng)的時(shí)間會(huì)明顯的增加。
如果電流限值調(diào)整過低,會(huì)導(dǎo)致電機(jī)一直處于軟啟動(dòng)的過程并且軟啟動(dòng)器的啟動(dòng)不能正常的完成。
- 軟啟動(dòng)時(shí)間的延長會(huì)導(dǎo)致軟啟動(dòng)器晶閘管更大的熱負(fù)荷
>> 斜坡軟啟動(dòng)過程的延長可以帶來較小的電流減小但卻會(huì)導(dǎo)致更大的熱負(fù)荷
- 斜坡軟停止會(huì)產(chǎn)生一個(gè)與電機(jī)啟動(dòng)時(shí)電流相仿但特性與電機(jī)固有特性相反的軟停止電流
>>斜坡軟停止會(huì)導(dǎo)致軟啟動(dòng)器和電機(jī)額外的熱負(fù)荷
軟停止過程也可能會(huì)導(dǎo)致綜合保護(hù)裝置的熱負(fù)荷超限,使得保護(hù)裝置的熱過載跳閘,這將取決于軟啟動(dòng)器或電機(jī)在運(yùn)行過程中熱量積累的程度。
使用軟啟動(dòng)器的幾點(diǎn)原則:
原則1
軟啟動(dòng)器可以避免因使用接觸器等直接啟動(dòng)設(shè)備啟動(dòng)所帶來的電網(wǎng)和機(jī)械沖擊,而且在啟動(dòng)過程中所產(chǎn)生的熱量小于直接啟動(dòng)所產(chǎn)生熱量。
減小啟動(dòng)電流(比如作為電網(wǎng)保護(hù))不是首要的目的,關(guān)鍵是能解決設(shè)備過熱的問題。
原則2
電流的限制值會(huì)影響到電機(jī)的恒定轉(zhuǎn)矩。不要調(diào)整啟動(dòng)電流低于某個(gè)定值(比如3.5倍的額定電流)而且也不要調(diào)整過快的啟動(dòng)速度。當(dāng)產(chǎn)生由于熱過載造成脫扣的狀況,可以提升軟啟動(dòng)器的電流限制值以達(dá)到更快的啟動(dòng)過程。在啟動(dòng)斜坡的作用下,電機(jī)電流(相應(yīng)的啟動(dòng)力矩)將緩慢的上升到限制電流值。
根據(jù)應(yīng)用場合,調(diào)整啟動(dòng)電壓,選擇啟動(dòng)時(shí)間比如1s。
忠告:
對(duì)于尺寸不大于S3規(guī)格的3RW40軟啟動(dòng)器,電流限制調(diào)整4為至5倍可能會(huì)導(dǎo)致啟動(dòng)失?。ㄜ泦?dòng)器選型過小可能會(huì)導(dǎo)致軟啟動(dòng)的過載脫扣),以避免軟啟動(dòng)器由于過熱導(dǎo)致的損壞。
解決方案:
減小啟動(dòng)頻率,調(diào)整電流限制到3.5倍或者使用更大規(guī)格的軟啟動(dòng)器。
原則3:
如果需要使用軟停止時(shí),應(yīng)盡可能的調(diào)短時(shí)間,以避免由于軟啟動(dòng)器和電機(jī)的發(fā)熱引起熱過載脫扣。
原則4:
在負(fù)載非常輕,啟動(dòng)時(shí)間很短的情況下,可以相應(yīng)的延長啟動(dòng)的時(shí)間來延長啟動(dòng)過程,并且持續(xù)的減小啟動(dòng)電流。
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