DI232

DI232

①操作面板上的按鍵；

②操作接線端子連接的部件（如按鈕和電位器）；

③復(fù)合操作（如操作面板設(shè)置頻率，操作接線端子連接的按鈕進(jìn)行啟/停控制）。為了操作方便和充分利用變頻器，也可以采用PLC來控制變頻器。

PLC控制變頻器有三種基本方式：

①以開關(guān)量方式控制；

②以模擬量方式控制；

③以RS485通信方式控制。

PLC以開關(guān)量方式控制變頻器的硬件連接

變頻器有很多開關(guān)量端子，如正轉(zhuǎn)、反轉(zhuǎn)和多檔轉(zhuǎn)速控制端子等，不使用PLC時，只要給這些端子接上開關(guān)就能對變頻器進(jìn)行正轉(zhuǎn)、反轉(zhuǎn)和多檔轉(zhuǎn)速控制。當(dāng)使用PLC控制變頻器時，若PLC是以開關(guān)量方式對變頻進(jìn)行控制，需要將PLC的開關(guān)量輸出端子與變頻器的開關(guān)量輸入端子連接起來，為了檢測變頻器某些狀態(tài)，同時可以將變頻器的開關(guān)量輸出端子與PLC的開關(guān)量輸入端子連接起來。

PLC以開關(guān)量方式控制變頻器的硬件連接如下圖所示。當(dāng)PLC內(nèi)部程序運(yùn)行使Y001端子內(nèi)部硬觸點(diǎn)閉合時，相當(dāng)于變頻器的STF端子外部開關(guān)閉合，STF端子輸入為ON，變頻器啟動電動機(jī)正轉(zhuǎn)，調(diào)節(jié)10、2、5端子所接電位器可以改變端子2的輸入電壓，從而改變變頻器輸出電源的頻率，進(jìn)而改變電動機(jī)的轉(zhuǎn)速。如果變頻器內(nèi)部出現(xiàn)異常時，A、C端子之間的內(nèi)部觸點(diǎn)閉合，相當(dāng)于PLC的X001端子外部開關(guān)閉合，X001端子輸入為ON。

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