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

GILAT KU-BAND ODU TRANSMITTER ANO950KU ANO 950 KU NEW

GENERAL STANDARDS CORP. PMC-SI104-ECI3 BOARD

SONY PCS-P600P MULTI MEDIA TERMINAL PROCESSOR

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Sun Microsystems CP2300S-650 Telecom blade Netra CP2300

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ADVANTECH PCI-1750 DIGITAL I/O COUNTER PCI BOARD

LOT OF 64 LCD DISPLAY PANEL DOT MATRIX 8X40 SCT8008AM

MATROX GENESIS PLUS GPG4N/400/128/2 PCI processor board

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Creo Scitex CCD HEAD 2 Board NEW P/N 503C3H002S

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PowerDsine 7012G Power over Ethernet Midspan PD-7012G

PowerDsine PD-6024 24 Port PoE Midspan PD-6024/AC/M

SPEARHEAD TECHNOLOGIES NETGAP 201 SECURITY PLATFORM

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MANGO DSP 350-00010-001 503-00038 P.N. 0660-A0972

SONY PCS-G510 DUAL MONITOR BOARD 1-671-389-12

PAN WORLD NH-250 PS MAGNETIC DRIVE PUMP NEW IN BOX

DALSA CORECO PC-CAMLINK LNK3108 PCI FRAME GRABBER

LIS 073320-183 CLOCK PROCESSOR 133 BLADE

RADVISION VIU-323/1E VIU-323 55421-00001

PMT-100 DETECTOR ASSY P/N 0090-A0692

Brooktrout VANTAGE VOLARE EURO 4 PORT 804-034-01

Gilat AN-0691-10 KU Band ODU Transmitter NJT3003T New 

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