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NEC RSA-983/D、
NEC RSA-983/D
NEC RSA-983/D
NEC RSA-983/D試驗(yàn)臺(tái)系統(tǒng)的組成和原理。試驗(yàn)臺(tái)由計(jì)算機(jī)采集系統(tǒng)和轉(zhuǎn)速閉環(huán)變頻控制的交流異步電機(jī)驅(qū)動(dòng)系統(tǒng)2部分組成。計(jì)算機(jī)系統(tǒng)由主機(jī)、顯示器、打印機(jī)、485、232通訊接口等附件組成。電機(jī)驅(qū)動(dòng)系統(tǒng)由變頻器、交流異步電機(jī)，油泵本體支撐、飛錘、轉(zhuǎn)速及位移測(cè)量?jī)x表組成。軟件包括的內(nèi)容有：報(bào)警、比較歷史數(shù)據(jù)、讀取歷史數(shù)據(jù)、讀取工況文件、讀取轉(zhuǎn)速和位移、頻率查詢、頻率設(shè)定、頻率應(yīng)答、速度應(yīng)答、形成圖像、形成工況文件、修改工況文件、起動(dòng)設(shè)定等。一般變頻器不具備無傳感器調(diào)速功能（在無速度反饋時(shí)它只能根據(jù)電壓/頻率比例大小同電機(jī)轉(zhuǎn)速的關(guān)系進(jìn)行調(diào)速，變頻器里的速度顯示是簡(jiǎn)單的頻率同速度的線性關(guān)系得到的）。
為保證供水壓力，提高產(chǎn)品質(zhì)量，根據(jù)工藝要求對(duì)原有的恒壓供水設(shè)備進(jìn)行技術(shù)改造，具體要求如下：（1）整個(gè)系統(tǒng)分為A、B2個(gè)子系統(tǒng)，其中A系統(tǒng)包括2臺(tái)水泵，B系統(tǒng)包括3臺(tái)水泵，電動(dòng)機(jī)功率為均185kW。（2）供水壓力為2.8±0.1MPa。（3）兩系統(tǒng)中一臺(tái)為泵，其它為備用泵。系統(tǒng)能夠自動(dòng)根據(jù)實(shí)際負(fù)荷情況和變頻器的故障情況啟停備用泵。（4）控制系統(tǒng)可靠性高，負(fù)荷變化時(shí)系統(tǒng)壓力保持恒定。
采用4臺(tái)變頻器進(jìn)行控制，其中A系統(tǒng)一臺(tái)變頻器，B系統(tǒng)兩臺(tái)變頻器，一臺(tái)作為兩系統(tǒng)共用。這樣一方面使得系統(tǒng)在啟停備用泵時(shí)能夠保持供水壓力恒定無波動(dòng)，另一方面降低了系統(tǒng)造價(jià)。采用兩臺(tái)PLC進(jìn)行控制。一臺(tái)作為A系統(tǒng)的主控PLC，同時(shí)作為B系統(tǒng)的備用控制PLC。另一臺(tái)作為B系統(tǒng)的主控PLC，同時(shí)作為A系統(tǒng)的備用控制PLC.這樣當(dāng)其中一臺(tái)PLC故障時(shí)，另一臺(tái)PLC承擔(dān)整個(gè)系統(tǒng)的全部控制任務(wù)，且無擾切換，使系統(tǒng)不會(huì)因一臺(tái)PLC的故障而停止工作，從而影響安全生產(chǎn)。
經(jīng)過PID運(yùn)算，將運(yùn)算結(jié)果以4-20mA電流信號(hào)的形式送到變頻器去，及時(shí)調(diào)整變頻器輸出頻率，從而調(diào)整電動(dòng)機(jī)的轉(zhuǎn)速，達(dá)到使供水壓力恒定的目的。變頻器還要將輸出電流以0-10V電壓信號(hào)的形式送到PLC中，使PLC及時(shí)根據(jù)水泵的負(fù)荷情況啟停備用泵。
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National Instruments CB-68LP 183030B-01
NATIONAL INSTRUMENT CFP-CB-1
National Instruments 763061-01
National Instruments GPIB NI-488.2
National Instruments GPIB NI-488.2M Function Reference Manual for Win32
National Instruments AMUX-64T 181990C-01
National Instruments 182419B-01
NATIONAL INSTRUMENT 183913C-01 183913C01
NATIONAL INSTRUMENT 777383-01 77738301
NATIONAL INSTRUMENT 777626-04 77762604
NATIONAL INSTRUMENT 777382-01 77738201
NATIONAL INSTRUMENT 777459-22 77745922
NATIONAL INSTRUMENT FP-AO-V5 FPAOV5
NATIONAL INSTRUMENT SCC-AO10 SCCAO10
NATIONAL INSTRUMENT 778052H-01 778052H01
NATIONAL INSTRUMENT CFP-TC-120 CFPTC120
NATIONAL INSTRUMENT 184683-C01 184683C01
NATIONAL INSTRUMENT 181830E-01 181830E01
NATIONAL INSTRUMENT 186380-02 18638002
NATIONAL INSTRUMENT 186380C-02 186380C02
NATIONAL INSTRUMENT 181830F-01 181830F01
National Instruments TBX-1328 SCXI-1120/D
NATIONAL INSTRUMENT 180950-01D 18095001D
NATIONAL INSTRUMENT 180524-10 18052410
NI-PCI-6052E National Instruments
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National Instruments Manual LABWindows/CVI Software Develop. Sys. Driver Develop
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Greece Greek Stamps 5th serie of 2014 EUROPA CEPT "NATIONAL MUSICAL INSTRUMENTS"
29/10/1969 Papua Guinea Airmail FDC - National Musical Instruments
NI National Instruments PCI-232/485 184683D-01
NATIONAL INSTRUMENT 183285-02 18328502
National Instruments CB-50
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NATIONAL INSTRUMENT 04-611-502 04611502
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