6ES7953-8LG11-0AA0

設(shè)計(jì)用來(lái)控制處理危險(xiǎn)的高電壓和高電流的逆變器，因此它融入了一系列系統(tǒng)監(jiān)視和保護(hù)功能。在有些情況下，當(dāng)探測(cè)到問(wèn)題時(shí)，MC3PHAC會(huì)立即做出響應(yīng)，努力降低故障的影響。在另外一些情況中， PWM會(huì)立即關(guān)閉，直到問(wèn)題解決，同時(shí)完成超時(shí)操作，表明可以安全重啟。對(duì)兩種類型的故障模式（低Vdd 和晶體探測(cè)丟失）來(lái)說(shuō)，MC3PHAC會(huì)重啟，致使PWM立即進(jìn)入高抗阻狀態(tài)，并迫使重新設(shè)置連接到復(fù)位管腳的所有外部硬件。每種保護(hù)功能都按問(wèn)題的嚴(yán)重性在下面進(jìn)行詳細(xì)討論。

高總線電壓

由于MC3PHAC 為交流驅(qū)動(dòng)提供的PWM類型會(huì)導(dǎo)致變頻器的完全4 象限運(yùn)行，因此能量可從電機(jī)回傳給直流總線。然而，在很多情況下，會(huì)阻止這種能量返回交流主線，而是作為1/2CV2儲(chǔ)存在總線電容器中。在大多數(shù)情況下，這種情況都是電機(jī)大幅減速的結(jié)果。如果總線電壓超過(guò)表2中描述的“總線電壓Decel值”的限制，MC3PHAC就會(huì)減緩降速以調(diào)整再生處理。而且，如果總線電壓超過(guò)表2中描述的“總線電壓Decel值”限制，MC3PHAC就會(huì)激活RBRAKE管腳，在電容器上打開(kāi)一個(gè)電阻負(fù)載，釋放再生能量而不是把它儲(chǔ)存起來(lái)。圖11顯示了通過(guò)1/2 hp電機(jī)的加速和減速獲得的波形及其對(duì)總線電壓的相應(yīng)影響。在這種情況下，只使用電阻制動(dòng)來(lái)限制總線電壓，并把“總線電壓Rbrake值”設(shè)置為其默認(rèn)值的110%。

6ES7953-8LG11-0AA0 

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