ALLEN BRADLEY 1771-IR當(dāng)1#鼓風(fēng)機變頻運行,要停機檢修變頻器或風(fēng)機時,投入3#鼓風(fēng)機。操作先用2#變頻器啟動3#鼓風(fēng)機,同時停 1#變頻器。由于機前壓力實現(xiàn)PID閉環(huán)控制,使得1#變頻按照設(shè)定的減速時間,平滑停車,進(jìn)口閥門流量緩慢減小。相反,3#鼓風(fēng)機按照設(shè)定加速時間,轉(zhuǎn)速平滑上升,進(jìn)口閥門流量緩慢增加。這樣保證機前集氣母管壓力恒定,實現(xiàn)兩臺鼓風(fēng)機無擾動切換,解決原控制系統(tǒng)下兩臺鼓風(fēng)機切換時產(chǎn)生的系統(tǒng)管網(wǎng)壓力發(fā)生劇烈波動的問題。
1771-IR機前壓力PID閉環(huán)控制
對于壓力、流量等被調(diào)參數(shù)來說,對象調(diào)節(jié)通道時間常數(shù)T0較小,而負(fù)荷又變化較快,這時微分作用和積分作用都要引起振蕩,對調(diào)節(jié)質(zhì)量影響很大,故不采用微分調(diào)節(jié)規(guī)律。因此,焦?fàn)t煤氣壓力自動調(diào)節(jié)控制、小循環(huán)閥自動調(diào)節(jié)都采用PI調(diào)節(jié)。P值越大,比例調(diào)節(jié)作用越強,I值越小,積分作用越強
ALLEN BRADLEY 1771-IR
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