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
Allen Bradley MPL-A430H-SJ22AA/MPLA430HSJ22 Brand !!
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