MVME 162-222PLC將模擬量輸入的輸出值轉(zhuǎn)換為實(shí)際的物理量:
轉(zhuǎn)換時(shí)應(yīng)考慮變送器的輸入/輸出量程和模擬量輸入模塊的量程,找出被測(cè)物理量與D轉(zhuǎn)換后的數(shù)字值之間的比例關(guān)系。(例題如下)
例MVME 162-222題:某發(fā)電機(jī)的電壓互感器的電壓比為10KV/100KV(線電壓),電流互感器的電流比為1000A/5A,PLC控制功率變送器的額定輸入電壓和額定輸入電流分別為AC100V和5A,額定輸出電壓為DC±5V模塊輸入信號(hào)轉(zhuǎn)換為數(shù)字-3200~+3200。設(shè)轉(zhuǎn)換后得到的數(shù)字為N,試求以KW為單位的有功功率值?
解:設(shè)計(jì)功率變送器時(shí)已考慮功率因數(shù)對(duì)功率計(jì)算的影響,因此在推導(dǎo)轉(zhuǎn)換公式時(shí),可以按功率因數(shù)1來處理。根據(jù)互感器額定值計(jì)算的一次回路的有功功率值為
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MVME 162-222
A15290500A
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