QJ61BT11N
QJ61BT11N
QJ61BT11N PID控制設(shè)計(jì)
將出廠水總管壓力壓力傳感器傳來的電流信號(hào)(4-20mA)輸入到三菱變頻器反饋信號(hào)輸入端子;泵房控制子站PLC接受到來自人機(jī)界面的壓力要求,壓力指令通過控制子站EM235模塊將模擬量輸出轉(zhuǎn)換成4~20mA電流信號(hào)輸出,該電流信號(hào)作為PID信號(hào)傳送到三菱變頻器PID控制器作為設(shè)定值;變頻器的PID控制器根據(jù)采集的信號(hào)計(jì)算出偏差量I(t),按照PID的微積分控制規(guī)則計(jì)算出控制量頻率△f(t),并將頻率控制量送至變頻器控制器,通過調(diào)整變頻器的輸出頻率改變水泵電機(jī)的轉(zhuǎn)速,達(dá)到調(diào)整壓力的需求,完成變速恒壓供水的目的。
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