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NEC RSA-983/D、
NEC RSA-983/D
NEC RSA-983/D
NEC RSA-983/D試驗臺系統的組成和原理。試驗臺由計算機采集系統和轉速閉環變頻控制的交流異步電機驅動系統2部分組成。計算機系統由主機、顯示器、打印機、485、232通訊接口等附件組成。電機驅動系統由變頻器、交流異步電機，油泵本體支撐、飛錘、轉速及位移測量儀表組成。軟件包括的內容有：報警、比較歷史數據、讀取歷史數據、讀取工況文件、讀取轉速和位移、頻率查詢、頻率設定、頻率應答、速度應答、形成圖像、形成工況文件、修改工況文件、起動設定等。一般變頻器不具備無傳感器調速功能（在無速度反饋時它只能根據電壓/頻率比例大小同電機轉速的關系進行調速，變頻器里的速度顯示是簡單的頻率同速度的線性關系得到的）。
為保證供水壓力，提高產品質量，根據工藝要求對原有的恒壓供水設備進行技術改造，具體要求如下：（1）整個系統分為A、B2個子系統，其中A系統包括2臺水泵，B系統包括3臺水泵，電動機功率為均185kW。（2）供水壓力為2.8±0.1MPa。（3）兩系統中一臺為泵，其它為備用泵。系統能夠自動根據實際負荷情況和變頻器的故障情況啟停備用泵。（4）控制系統可靠性高，負荷變化時系統壓力保持恒定。
采用4臺變頻器進行控制，其中A系統一臺變頻器，B系統兩臺變頻器，一臺作為兩系統共用。這樣一方面使得系統在啟停備用泵時能夠保持供水壓力恒定無波動，另一方面降低了系統造價。采用兩臺PLC進行控制。一臺作為A系統的主控PLC，同時作為B系統的備用控制PLC。另一臺作為B系統的主控PLC，同時作為A系統的備用控制PLC.這樣當其中一臺PLC故障時，另一臺PLC承擔整個系統的全部控制任務，且無擾切換，使系統不會因一臺PLC的故障而停止工作，從而影響安全生產。
經過PID運算，將運算結果以4-20mA電流信號的形式送到變頻器去，及時調整變頻器輸出頻率，從而調整電動機的轉速，達到使供水壓力恒定的目的。變頻器還要將輸出電流以0-10V電壓信號的形式送到PLC中，使PLC及時根據水泵的負荷情況啟停備用泵。
NEC RSA-983/D
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National Instruments 763061-01
National Instruments GPIB NI-488.2
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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
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NATIONAL INSTRUMENT 186380C-02 186380C02
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Greece Greek Stamps 5th serie of 2014 EUROPA CEPT "NATIONAL MUSICAL INSTRUMENTS"
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