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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
lijinniu
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1樓  發(fā)表于: 2013-08-05 14:42
根據你的描述：一、頻率肯定會(huì )一樣的是波動(dòng)的。這個(gè)波動(dòng)和變頻器的啟動(dòng)和停止時(shí)間是有關(guān)系的。二、和模擬量的效果不好比。除非你想的模擬量也是一個(gè)按一定頻率波動(dòng)的量。

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