LENZE EVS9326-ES

欲使變頻系統(tǒng)中的某一個(gè)物理量穩(wěn)定在預(yù)期的目標(biāo)值上，變頻器的PID功能電路將反饋信號(hào)與目標(biāo)信號(hào)不斷地進(jìn)行比較，并根據(jù)比較結(jié)果來(lái)實(shí)時(shí)地調(diào)整輸出頻率和電動(dòng)機(jī)的轉(zhuǎn)速。所以，變頻器的PID控制至少需要兩種控制信號(hào)：目標(biāo)信號(hào)和反饋信號(hào)。diangon.com這里所說(shuō)的目標(biāo)信號(hào)是某物理量預(yù)期穩(wěn)定值所對(duì)應(yīng)的電信號(hào)，亦稱目標(biāo)值或給定值；而該物理量通過(guò)傳感器測(cè)量到的實(shí)際值對(duì)應(yīng)的電信號(hào)稱為反饋信號(hào)，亦稱反饋量或當(dāng)前值。

實(shí)現(xiàn)變頻器的閉環(huán)控制，對(duì)于目標(biāo)信號(hào)來(lái)說(shuō)，有兩個(gè)問(wèn)題需要解決，一是選擇將目標(biāo)值（目標(biāo)信號(hào)）傳送給變頻器的輸入通道，二是確定目標(biāo)值的大小。對(duì)于第一個(gè)問(wèn)題，各種變頻器大體上有如下兩種方案。一是自動(dòng)轉(zhuǎn)換法，即變頻器預(yù)置PID功能有效時(shí)，其開(kāi)環(huán)運(yùn)行時(shí)的頻率給定功能自動(dòng)轉(zhuǎn)為目標(biāo)值給定，如表1中的安川CIMR-G7A與富士G11S變頻器。二是通道選擇法，如表1中的博世力士樂(lè)CVF-G3與格立特VF-10系列變頻器。

LENZE EVS9326-ES 

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