描述
我看書(shū)時(shí)發(fā)現(xiàn),西門子S120變頻器有額定電流,基準(zhǔn)負(fù)載電流Ih,基準(zhǔn)負(fù)載電流IL,最大電流。這四種電流分別啥意思啊,選型時(shí)用到的是哪個(gè),只看額定的么?
答:逆變器裝置有對(duì)顛覆轉(zhuǎn)矩的過(guò)載能力,如果出現(xiàn)較大的浪涌負(fù)載,那么在設(shè)計(jì)選型時(shí)就必須考慮在內(nèi)。因此選擇相應(yīng)的基準(zhǔn)負(fù)載電流作為所需負(fù)載的基礎(chǔ)。在過(guò)載發(fā)生前后,傳動(dòng)以基準(zhǔn)負(fù)載電流工作,負(fù)載的周期為300s。
IL是輕載時(shí)的基準(zhǔn)負(fù)載電流;允許持續(xù)60s的110%的過(guò)載或持續(xù)10s的150%過(guò)載。
IH是重過(guò)載時(shí)的基準(zhǔn)負(fù)載電流;允許持續(xù)60s的150%的過(guò)載或持續(xù)10s的160%過(guò)載。
Irated是逆變器的輸出額定電流;
在同等功率同等負(fù)載應(yīng)用下的逆變器,在考慮重過(guò)載和輕過(guò)載時(shí),認(rèn)為三者基準(zhǔn)負(fù)載電流的關(guān)系是:IH<IL<Irated;即重過(guò)載時(shí),更應(yīng)該注意留余量。
所以,在綜合考慮各種應(yīng)用的場(chǎng)合,大多設(shè)計(jì)者使用的經(jīng)驗(yàn)值大約在1.2~1.25%的余量比較經(jīng)濟(jì)也能滿足負(fù)載要求。
最大電流,可以理解為逆變器承受的最大超出Irated的電流,一般再傳動(dòng)系統(tǒng)有余量的時(shí)候限制逆變器的最大電流為額定電流,但也可以稍微放寬點(diǎn),比如105%-110%的電流限制,散熱要更嚴(yán)格!
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