描述
三菱變頻器外部端子調(diào)速可分為模擬量調(diào)速和多段速調(diào)速。模擬量調(diào)速可用電壓DC0~10V或電流DC4~20mA,進(jìn)行無級(jí)調(diào)速。我廠用0~10V模擬電壓作為給定量,進(jìn)行開環(huán)調(diào)速;多段速采用外部輸入端子SD﹑STF﹑RL﹑RM﹑RH,進(jìn)行三段速調(diào)速。RL﹑RM﹑RH是低﹑中﹑高三段速速度選擇端子,SD是輸入公共端,STF是啟動(dòng)正轉(zhuǎn)信號(hào)。如圖3中,當(dāng)Y10,Y11有輸出時(shí),變頻器為低速運(yùn)行;當(dāng)Y10,Y12有輸出時(shí),為中速運(yùn)行;當(dāng)Y10,Y13有輸出時(shí)為高速運(yùn)行。變頻器2﹑3原理與此相同。三段速分別設(shè)置為15Hz﹑30Hz﹑45Hz。在模擬量調(diào)速時(shí),通過調(diào)整W1﹑W2的分壓比設(shè)置KA1閉合時(shí)變頻器高速運(yùn)行,KA2閉合時(shí)為低速運(yùn)行,當(dāng)KA1﹑KA2都斷開時(shí),變頻器為最高速;變頻器2﹑3原理與此相同。通過編程,PLC根據(jù)操作臺(tái)發(fā)出的信號(hào),選擇控制方式:模擬量調(diào)速或多段速調(diào)速。三菱變頻器的多段速調(diào)速比模擬量調(diào)速有較高優(yōu)先級(jí)(1)。
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