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hhm76
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樓主  發(fā)表于: 2010-10-12 08:11
本系統的方案是：三菱FX1S-30MR+V/F+PWM+變頻器，原理是壓力變送器采集的信號經(jīng)V/F，變成脈沖進(jìn)入FX1S的高速計數，電位的V信號也經(jīng)過(guò)V/F進(jìn)入高速計數。經(jīng)過(guò)PLC比較，就知道設定壓力與實(shí)際壓力的大小。經(jīng)過(guò)比較的差值來(lái)通過(guò)PLC高速輸出脈沖，經(jīng)過(guò)PWM，轉成變頻器可接收的電壓信號，從面調節供水壓力。

    大家是不是以為我寫(xiě)錯了，FX1S-30MR的繼電器輸出的怎么會(huì )發(fā)脈沖，其實(shí)我沒(méi)有寫(xiě)錯，因為這個(gè)PLC改裝了，把繼電器拆了。呵呵！這就是廠(chǎng)家的高明之處。我的QQ：121235627
描述：恒壓供水三菱程序
附件： 恒壓供水.rar (12 K) 下載次數:214
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