MPC240

MPC240

刀開關(guān)QS1為電路的總開關(guān)，熔斷器FU為電路的短路保護(hù)，轉(zhuǎn)換開關(guān)QS2為電源的換相開關(guān)。轉(zhuǎn)換開關(guān)QS2有三檔位置，分別為“順“，”?！?，“反”轉(zhuǎn)。當(dāng)合上電源開關(guān)QS1，將轉(zhuǎn)換開關(guān)QS2扳至左邊“順”檔位置時，三相電源通過以下途徑進(jìn)入電動機(jī)M三相繞組：L1-QS1-FU-QS2-U1-U相繞組;L2-QS1-FU-QS2-V1-V相繞組;L3-QS1-FU-QS2-W1-W相繞組;此時電動機(jī)M通電正轉(zhuǎn)。

當(dāng)需要電動機(jī)M反轉(zhuǎn)時，將轉(zhuǎn)換開關(guān)“QS2”扳至“?！睋跷恢茫妱訖C(jī)M完全停止后再將轉(zhuǎn)換開關(guān)扳至右邊“反”檔位置，三相電源通過以下途徑進(jìn)入電動機(jī)三相繞組：L1-QS1-FU-QS2-W1-W相繞組;L2-QS1-FU-QS2-V1-V相繞組;L3-QS1-FU-QS2-U1-U相繞組;此時電動機(jī)M反轉(zhuǎn)。

從以上分析可知，若將電動機(jī)從正轉(zhuǎn)運(yùn)行狀態(tài)轉(zhuǎn)換為反轉(zhuǎn)運(yùn)行狀態(tài)，只需將電動機(jī)的任意兩相繞組調(diào)換相序即可。

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