變頻電路的連接與調(diào)試

作者：27、18、29、03、33任務(wù)2.2變頻電路的連接與調(diào)試任務(wù)描述2、進(jìn)行變頻器參數(shù)的調(diào)試；1、根據(jù)變頻連接電路圖，進(jìn)行變頻電路的模擬連接；3、進(jìn)行主軸正、反轉(zhuǎn)和停轉(zhuǎn)的模擬演示。變頻電路圖變頻器參數(shù)的調(diào)試

變頻器功能參數(shù)很多，一般都有數(shù)十甚至百個(gè)參數(shù)供用戶(hù)選擇。實(shí)際應(yīng)用中，沒(méi)必要對(duì)每一參數(shù)都進(jìn)行設(shè)置和調(diào)試，多數(shù)只要采用出廠設(shè)定值即可。但有些參數(shù)由于和實(shí)際使用情況有很在關(guān)系，有的還相互關(guān)聯(lián)，因此要根據(jù)實(shí)際進(jìn)行設(shè)定和調(diào)試。因各類(lèi)型變頻器功能參數(shù)的名稱(chēng)也不一致，為敘述方便，以富士變頻器基本參數(shù)名稱(chēng)為例。由于基本參數(shù)是各類(lèi)型變頻器幾乎都有完全可以做到觸類(lèi)旁通變頻器參數(shù)的調(diào)試

1、加減速時(shí)間加速時(shí)間就暗輸出頻率從0上升到最大頻率所需時(shí)間，減速時(shí)間是指從最大頻率下降到0所需時(shí)間。通常用頻率設(shè)定信號(hào)上升下降來(lái)確定加減速時(shí)間。2、轉(zhuǎn)矩提升又叫轉(zhuǎn)矩補(bǔ)償，是為補(bǔ)償因電動(dòng)機(jī)定子繞組電阻所引起的低速時(shí)轉(zhuǎn)矩降低，而把低頻率范圍F/V增大的方法。設(shè)定為自動(dòng)時(shí)，可使加速時(shí)的電壓自動(dòng)提升以補(bǔ)償起動(dòng)轉(zhuǎn)矩，使電動(dòng)機(jī)加速順利進(jìn)行。如采用手動(dòng)補(bǔ)償時(shí)，根據(jù)負(fù)載特性，尤其是負(fù)載的起動(dòng)特性，通過(guò)試驗(yàn)可選出較好曲線。

3、電子熱過(guò)載保護(hù)

本功能為保護(hù)電動(dòng)機(jī)過(guò)熱面設(shè)置，它是變頻器內(nèi)CPU根據(jù)運(yùn)轉(zhuǎn)電流值和頻率計(jì)算出電動(dòng)機(jī)的溫升，從而進(jìn)行過(guò)熱保護(hù)。本功能只適用于“一拖一”場(chǎng)合，而在“一拖多”時(shí)，應(yīng)在名臺(tái)電動(dòng)機(jī)上加裝熱繼電器。電子熱保護(hù)設(shè)定值（%）=[電動(dòng)機(jī)額定電流（A）變頻器額定輸出電流（A）]*100%

4、頻率限定

即變頻器輸出頻率上下限幅值。頻率限制是為防止誤操作或外接頻率設(shè)定信號(hào)源出故障，而引起輸出頻率的過(guò)高或過(guò)低，以防損壞設(shè)備的一種保護(hù)功能。在應(yīng)用中按實(shí)際情況設(shè)定即可。

變頻器參數(shù)的調(diào)試5、偏置頻率有的又叫偏差頻率或頻率偏差設(shè)定。其用途是當(dāng)頻率由外部模擬信號(hào)（電壓或電流）進(jìn)行設(shè)定時(shí)，可用此功能調(diào)整頻率設(shè)定信號(hào)最低時(shí)輸出頻率的高低。有的變頻器當(dāng)頻率設(shè)定信號(hào)為0%時(shí)，偏差值可作用在0~FMAX范圍內(nèi)，有的變頻器（如三墾）還可對(duì)偏置極性進(jìn)行設(shè)定6、頻率設(shè)定信號(hào)增益

此功能僅用外部模擬信號(hào)設(shè)定頻率時(shí)才有效。它是用來(lái)彌補(bǔ)外部設(shè)定信號(hào)電壓與變頻器內(nèi)電壓（+10V）的不一致問(wèn)題：同時(shí)方便模擬設(shè)定信號(hào)電壓的選擇，設(shè)定時(shí)，當(dāng)模擬輸入信號(hào)為最大時(shí)，求出可輸出F/V圖形的頻率百分?jǐn)?shù)并以此為參數(shù)進(jìn)行設(shè)定即可。7、轉(zhuǎn)矩限制可分為驅(qū)動(dòng)轉(zhuǎn)矩限制和制動(dòng)轉(zhuǎn)矩限制二種。它是根據(jù)變頻器輸出電壓和電流值，經(jīng)CPU進(jìn)行轉(zhuǎn)矩計(jì)算，其可對(duì)加減速和恒速運(yùn)行時(shí)的沖擊負(fù)載恢復(fù)特性有顯著改善。轉(zhuǎn)矩限制功能可實(shí)現(xiàn)自動(dòng)加速和減速控制。假設(shè)加減速時(shí)間小于負(fù)載慣量時(shí)間時(shí)，也能保證電動(dòng)機(jī)按照轉(zhuǎn)矩設(shè)定值自動(dòng)加速和減速8、加減速模式選擇

又叫加減速曲線選擇，一般變頻器有線性、非線性和S三種曲線，通常大多選擇線性曲線：非線性曲線適用于變轉(zhuǎn)矩負(fù)載，如風(fēng)機(jī)等；S曲線適用于恒轉(zhuǎn)矩負(fù)載，其加減速變化較為緩慢。變頻器參數(shù)的調(diào)試矢量控制是基于理論上認(rèn)為：異步電動(dòng)機(jī)與直流電動(dòng)機(jī)具有相同的轉(zhuǎn)矩產(chǎn)生機(jī)理。矢量控制方式變是將定子電流分解成規(guī)定的磁場(chǎng)電流和轉(zhuǎn)矩電流表，分別進(jìn)行控制，同時(shí)將兩者合成后的定子電流輸出給電動(dòng)機(jī)。9、轉(zhuǎn)矩矢量控制風(fēng)機(jī)、水泵都屬于減轉(zhuǎn)矩負(fù)載，即隨著轉(zhuǎn)速的下降，負(fù)載轉(zhuǎn)矩與轉(zhuǎn)速的的平方成比例減小，而具有節(jié)能控制功能的變頻器設(shè)計(jì)有專(zhuān)用V/F模式，這種模式可改善電動(dòng)機(jī)和變頻器的效率，其可根據(jù)負(fù)載電流自動(dòng)降低變頻器輸出電壓，從而達(dá)到節(jié)能目的，可根據(jù)具體情況設(shè)置為有效為有效或無(wú)效。10、節(jié)能控制任務(wù)描述ClicktoaddTitle1ClicktoaddTitle2ClicktoaddTitle3ClicktoaddTitle4Diagram

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