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木皮
學(xué)海無(wú)涯
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樓主  發(fā)表于: 2013-08-05 10:46
請問(wèn)一下我先用PID得出輸出值D20再用PWM D20 K1000 Y0控制Y0。COM1接上變頻器上的12V，Y0接在變頻器上的0-10V上。這樣靠Y0的通斷來(lái)控制變頻器的輸入電壓，我用表量是可調壓，但指針有點(diǎn)擺動(dòng)，我想問(wèn)一下頻率會(huì )不會(huì )也一直擺，還有會(huì )不會(huì )對變頻器有影響。能不能達到像輸入模擬量一樣的效果。謝謝！
大家好才是真的好
hanqin
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1樓  發(fā)表于: 2013-08-05 15:46
PWM是脈寬調制，不是模擬量輸出啊。
hanqin
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2樓  發(fā)表于: 2013-08-06 14:43
還是加模擬量輸出模塊，或者買(mǎi)脈沖調制轉4--20ma模擬量的板子。就是不知道有沒(méi)有。

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