描述
3HAB8101-13
這是最簡(jiǎn)單的反饋控制，有時(shí)也叫開(kāi)關(guān)控制。這種控制是當(dāng)被測(cè)量達(dá)到最高值或最低值的時(shí)候，就給出一個(gè)開(kāi)關(guān)的信號(hào)。雖然被測(cè)量可能是模擬量，但控制輸出是開(kāi)關(guān)的，所以叫兩位控制。在工業(yè)現(xiàn)場(chǎng)，有許多溫控器和液位開(kāi)關(guān)控制是采用這種方式的?？刂破鞯妮敵鲋蹬c被控參數(shù)的測(cè)量值和設(shè)定值或某個(gè)參考點(diǎn)的偏差是一個(gè)比例關(guān)系。比例控制比二位控制要平滑一些，消除了二位控制時(shí)會(huì)產(chǎn)生的被控量上下振蕩的情形。比如，對(duì)一個(gè)反應(yīng)罐的液位，如果設(shè)定的液位值是2700毫米，當(dāng)液位降低時(shí)，進(jìn)料管道上的閥門(mén)就要增加開(kāi)度，而液位偏高時(shí)，則要將開(kāi)度減小。增加和減小的比例與液位和設(shè)定值的偏差大小成比例關(guān)系在積分控制中，被控變量的值的變化與控制系統(tǒng)輸出控制到實(shí)際生效的時(shí)間有一個(gè)預(yù)先設(shè)定的關(guān)系。執(zhí)行機(jī)構(gòu)的輸出是漸漸地達(dá)到設(shè)定的值的。這種控制方式的產(chǎn)生是由于實(shí)際的控制元件和執(zhí)行機(jī)構(gòu)從給出輸出信號(hào)到使被控變量達(dá)到設(shè)定值往往需要一段時(shí)間。
最常見(jiàn)的例子是溫度控制，比如，假定我們知道到煤氣閥門(mén)的開(kāi)度到60%的時(shí)候，熱水器的水溫能夠達(dá)到適宜洗澡的45度，但是，當(dāng)你把閥門(mén)一下子擰到60%的位置時(shí)，水依然是涼的，你必須等一下，水溫升到45度左右的時(shí)候，就會(huì)穩(wěn)定。如果控制系統(tǒng)不用積分控制，而只用比例控制，那么當(dāng)閥門(mén)輸出為60%時(shí)，這是輸入的溫度值可能依然只有20度，那么按照比例控制，既然偏差依然存在，則閥門(mén)的開(kāi)度會(huì)繼續(xù)加大，這樣，當(dāng)水溫升到45度時(shí)，閥門(mén)的開(kāi)度可能會(huì)達(dá)到了90%甚至更高，這時(shí)，雖然控制系統(tǒng)會(huì)通知閥門(mén)保持不動(dòng)，但水溫會(huì)繼續(xù)升高，可能到了50甚至60度，這時(shí)，閥門(mén)的開(kāi)度會(huì)減小，但在減小到60%之前，水溫都會(huì)繼續(xù)上升，當(dāng)閥門(mén)開(kāi)度減到60%時(shí)，水溫依然可能70度，一直當(dāng)閥門(mén)的開(kāi)度變成20%時(shí)，水溫才會(huì)變成45度，這時(shí)閥門(mén)運(yùn)動(dòng)會(huì)停止，但水溫卻會(huì)繼續(xù)下降，直到變成涼水，如果這時(shí)是冬天，可能你的情形還要糟糕。這就是沒(méi)有積分控制的溫度控制器會(huì)發(fā)生的情況。如果你有小孩，當(dāng)孩子第一次操作熱水器的閥門(mén)的時(shí)候，發(fā)生的情形就很像這種情況。
產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢(shì)價(jià)格，大量現(xiàn)貨。
主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
品牌：ABB???,AB??,GE,FOXBORO,本特利，英維思，伍德沃德，西屋，瑞恩，施耐德，西門(mén)子，摩托羅拉，安川。力士樂(lè)。ACSO，橫河等進(jìn)口品牌。 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA ? 專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊 15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國(guó)內(nèi)實(shí)力庫(kù)存商家
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專業(yè)銷售進(jìn)口DCS? PLC系統(tǒng)備件模塊
PLC模塊，可編程控制器，CPU模塊，IO模塊，AI模塊，通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅
15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國(guó)內(nèi)實(shí)力庫(kù)存商家
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