天津DACO接觸器DOC-40,DOC-48,DOC-50,DOC-65,DOC-75,韓國Sinwoo S-CON變送器。中山立訊電氣有限公司,中山朗立電氣有限公司

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啟動方式運用串接于電源與被控電機之間的軟起動器，控制其內(nèi)部晶閘管的導(dǎo)通角，使電機輸入電壓從零以預(yù)設(shè)函數(shù)關(guān)系逐漸上升，直至起動結(jié)束，賦予電機全電壓，即為軟起動，在軟起動過程中，電機起動轉(zhuǎn)矩逐漸增加，轉(zhuǎn)速也逐漸增加。軟起動一般有下面幾種起動方式。斜坡升壓軟起動：這種起動方式簡單，不具備電流閉環(huán)控制，僅調(diào)整晶閘管導(dǎo)通角，使之與時間成一定函數(shù)關(guān)系增加。其缺點是，由于不限流，在電機起動過程中，有時要產(chǎn)生較大的沖擊電流使晶閘管損壞，對電網(wǎng)影響較大，實際很少應(yīng)用。斜坡恒流軟起動：這種起動方式是在電動機起動的初始階段起動電流逐漸增加，當(dāng)電流達到預(yù)先所設(shè)定的值后保持恒定（t1至t2階段），直至起動完畢。起動過程中。
天津DACO接觸器DOC-40,DOC-48,DOC-50,DOC-65,DOC-75,

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將萬用表調(diào)到電阻X10檔，紅表棒接到P，黑表棒分別依到R、S、T，正常時有幾十歐的阻值，且基本平衡。相反將黑表棒接到P端，紅表棒依變頻器維修圖片變頻器維修圖片(4張)次接到R、S、T，有一個接近于無窮大的阻值。將紅表棒接到N端，重復(fù)以上步驟，都應(yīng)得到相同結(jié)果。如果有以阻值三相不平衡，說明整流橋有故障.B.紅表棒接P端時，電阻無窮大，可以斷定整流橋故障或啟動電阻出現(xiàn)故障。測試逆變電路將紅表棒接到P端，黑表棒分別接U、V、W上，應(yīng)該有幾十歐的阻值，且各相阻值基本相同。將黑表棒N端，反相應(yīng)該為無窮大，重復(fù)以上步驟應(yīng)得到相同結(jié)果，否則可確定逆變模塊有故障。動態(tài)測試在靜態(tài)測試結(jié)果正常以后，才可進行動態(tài)測試。
天津DACO接觸器DOC-40,DOC-48,DOC-50,DOC-65,DOC-75,

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反向阻斷峰值電壓VPR當(dāng)可控硅加反向電壓，處于反向關(guān)斷狀態(tài)時，可以重復(fù)加在可控硅兩端的反向峰值電壓。使用時，不能超過手冊給出的這個參數(shù)值。觸發(fā)電壓VGT在規(guī)定的環(huán)境溫度下，陽極---陰極間加有一定電壓時，可控硅從關(guān)斷狀態(tài)轉(zhuǎn)為導(dǎo)通狀態(tài)所需要的控制極電流和電壓。維持電流IH在規(guī)定溫度下，控制極斷路，維持可控硅導(dǎo)通所必需的陽極正向電流。許多新型可控硅元件相繼問世，如適于高頻應(yīng)用的快速可控硅，可以用正或負(fù)的觸發(fā)信號控制兩個方向?qū)ǖ碾p向可控硅，可以用正觸發(fā)信號使其導(dǎo)通，用負(fù)觸發(fā)信號使其關(guān)斷的可控硅等等。分類編輯可控硅有多種分類方法。（一）按關(guān)斷、導(dǎo)通及控制方式分類：可控硅按其關(guān)斷、導(dǎo)通及控制方式可分為普通可控硅、雙向可控硅、逆導(dǎo)可控硅、門極關(guān)斷可控硅（GTO）、BTG可控硅、溫控可控硅和光控可控硅等多種。
天津DACO接觸器DOC-40,DOC-48,DOC-50,DOC-65,DOC-75,

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LCT-7R5-W LCT-7R5-X LCT-7R5-Y LCT-7R5-Z
LCT-7R6-W LCT-7R6-X LCT-7R6-Y LCT-7R6-Z

后這些交流波形經(jīng)過整流濾波后就得到直流輸出電壓?？刂破鞯闹饕康氖潜３州敵鲭妷悍€(wěn)定，其工作過程與線性形式的控制器很類似。也就是說控制器的功能塊、電壓參考和誤差放大器，可以設(shè)計成與線性調(diào)節(jié)器相同。他們的不同之處在于，誤差放大器的輸出（誤差電壓）在驅(qū)動功率管之前要經(jīng)過一個電壓/脈沖寬度轉(zhuǎn)換單元。開關(guān)電源有兩種主要的工作方式：正激式變換和升壓式變換。盡管它們各部分的布置差別很小，但是工作過程相差很大，在特定的應(yīng)用場合下各有優(yōu)點。[1]工作條件編輯開關(guān)：電力電子器件工作在開關(guān)狀態(tài)而不是線性狀態(tài)高頻：電力電子器件工作在高頻而不是接近工頻的低頻直流：開關(guān)電源輸出的是直流而不是交流[1]主要特點編輯體積小、重量輕：由于沒有工頻變壓器。
天津DACO接觸器DOC-40,DOC-48,DOC-50,DOC-65,DOC-75,

LCT-7R7-W LCT-7R7-X LCT-7R7-Y LCT-7R7-Z
LCT-7R8-W LCT-7R8-X LCT-7R8-Y LCT-7R8-Z
LCT-7RR-W LCT-7RR-X LCT-7RR-Y LCT-7RR-Z
LCT-7RN-W LCT-7RN-X LCT-7RN-Y LCT-7RN-Z
LCT-9A1-W LCT-9A1-X LCT-9A1-Y LCT-9A1-Z
LCT-9A2-W LCT-9A2-X LCT-9A2-Y LCT-9A2-Z
LCT-9A3-W LCT-9A3-X LCT-9A3-Y LCT-9A3-Z
LCT-9A4-W LCT-9A4-X LCT-9A4-Y LCT-9A4-Z
LCT-9A5-W LCT-9A5-X LCT-9A5-Y LCT-9A5-Z
LCT-9A6-W LCT-9A6-X LCT-9A6-Y LCT-9A6-Z
LCT-9A7-W LCT-9A7-X LCT-9A7-Y LCT-9A7-Z
LCT-9A8-W LCT-9A8-X LCT-9A8-Y LCT-9A8-Z
LCT-9AR-W LCT-9AR-X LCT-9AR-Y LCT-9AR-Z
LCT-9AN-W LCT-9AN-X LCT-9AN-Y LCT-9AN-Z
LCT-9B1-W LCT-9B1-X LCT-9B1-Y LCT-9B1-Z
LCT-9B2-W LCT-9B2-X LCT-9B2-Y LCT-9B2-Z
LCT-9B3-W LCT-9B3-X LCT-9B3-Y LCT-9B3-Z
LCT-9B4-W LCT-9B4-X LCT-9B4-Y LCT-9B4-Z
LCT-9B5-W LCT-9B5-X LCT-9B5-Y LCT-9B5-Z
LCT-9B6-W LCT-9B6-X LCT-9B6-Y LCT-9B6-Z
LCT-9B7-W LCT-9B7-X LCT-9B7-Y LCT-9B7-Z
LCT-9B8-W LCT-9B8-X LCT-9B8-Y LCT-9B8-Z
LCT-9BR-W LCT-9BR-X LCT-9BR-Y LCT-9BR-Z
LCT-9BN-W LCT-9BN-X LCT-9BN-Y LCT-9BN-Z
LCT-9C1-W LCT-9C1-X LCT-9C1-Y LCT-9C1-Z
LCT-9C2-W LCT-9C2-X LCT-9C2-Y LCT-9C2-Z
LCT-9C3-W LCT-9C3-X LCT-9C3-Y LCT-9C3-Z
LCT-9C4-W LCT-9C4-X LCT-9C4-Y LCT-9C4-Z
LCT-9C5-W LCT-9C5-X LCT-9C5-Y LCT-9C5-Z
LCT-9C6-W LCT-9C6-X LCT-9C6-Y LCT-9C6-Z
LCT-9C7-W LCT-9C7-X LCT-9C7-Y LCT-9C7-Z
LCT-9C8-W LCT-9C8-X LCT-9C8-Y LCT-9C8-Z
LCT-9CR-W LCT-9CR-X LCT-9CR-Y LCT-9CR-Z
LCT-9CN-W LCT-9CN-X LCT-9CN-Y LCT-9CN-Z
LCT-9D1-W LCT-9D1-X LCT-9D1-Y LCT-9D1-Z

動觸點就移動，使原來斷開的成閉合，原來閉合的成斷開狀態(tài)，達到轉(zhuǎn)換的目的。這樣的觸點組稱為轉(zhuǎn)換觸點。用“轉(zhuǎn)”字的拼音字頭“z”表示。選用編輯1.先了解必要的條件①控制電路的電源電壓，能提供的電流；②被控制電路中的電壓和電流；③被控電路需要幾組、什么形式的觸點。選用繼電器時，一般控制電路的電源電壓可作為選用的依據(jù)?？刂齐娐窇?yīng)能給繼電器提供足夠的工作電流，否則繼電器吸合是不穩(wěn)定的。2.查閱有關(guān)資料確定使用條件后，可查找相關(guān)資料，找出需要的繼電器的型號和規(guī)格號。若手頭已有繼電器，可依據(jù)資料核對是否可以利用。后考慮尺寸是否合適。3.注意器具的容積。若是用于一般用電器，除考慮機箱容積外，小型繼電器主要考慮電路板安裝布局。
天津DACO接觸器DOC-40,DOC-48,DOC-50,DOC-65,DOC-75,

LCT-9D2-W LCT-9D2-X LCT-9D2-Y LCT-9D2-Z
LCT-9D3-W LCT-9D3-X LCT-9D3-Y LCT-9D3-Z
LCT-9D4-W LCT-9D4-X LCT-9D4-Y LCT-9D4-Z
LCT-9D5-W LCT-9D5-X LCT-9D5-Y LCT-9D5-Z
LCT-9D6-W LCT-9D6-X LCT-9D6-Y LCT-9D6-Z
LCT-9D7-W LCT-9D7-X LCT-9D7-Y LCT-9D7-Z
LCT-9D8-W LCT-9D8-X LCT-9D8-Y LCT-9D8-Z
LCT-9DR-W LCT-9DR-X LCT-9DR-Y LCT-9DR-Z
LCT-9DN-W LCT-9DN-X LCT-9DN-Y LCT-9DN-Z
LCT-9E1-W LCT-9E1-X LCT-9E1-Y LCT-9E1-Z
LCT-9E2-W LCT-9E2-X LCT-9E2-Y LCT-9E2-Z
LCT-9E3-W LCT-9E3-X LCT-9E3-Y LCT-9E3-Z
LCT-9E4-W LCT-9E4-X LCT-9E4-Y LCT-9E4-Z
LCT-9E5-W LCT-9E5-X LCT-9E5-Y LCT-9E5-Z
LCT-9E6-W LCT-9E6-X LCT-9E6-Y LCT-9E6-Z
LCT-9E7-W LCT-9E7-X LCT-9E7-Y LCT-9E7-Z
LCT-9E8-W LCT-9E8-X LCT-9E8-Y LCT-9E8-Z
LCT-9ER-W LCT-9ER-X LCT-9ER-Y LCT-9ER-Z
LCT-9EN-W LCT-9EN-X LCT-9EN-Y LCT-9EN-Z
LCT-9R1-W LCT-9R1-X LCT-9R1-Y LCT-9R1-Z
LCT-9R2-W LCT-9R2-X LCT-9R2-Y LCT-9R2-Z
LCT-9R3-W LCT-9R3-X LCT-9R3-Y LCT-9R3-Z
LCT-9R4-W LCT-9R4-X LCT-9R4-Y LCT-9R4-Z
LCT-9R5-W LCT-9R5-X LCT-9R5-Y LCT-9R5-Z
LCT-9R6-W LCT-9R6-X LCT-9R6-Y LCT-9R6-Z
LCT-9R7-W LCT-9R7-X LCT-9R7-Y LCT-9R7-Z
LCT-9R8-W LCT-9R8-X LCT-9R8-Y LCT-9R8-Z
LCT-9RR-W LCT-9RR-X LCT-9RR-Y LCT-9RR-Z
LCT-9RN-W LCT-9RN-X LCT-9RN-Y LCT-9RN-Z

頻繁啟動的場所可取電動機額定電流的2．25～2．5倍。欠電流繼電器的整定電流一般取額定電流的0．1～o．2倍。[1]安裝和使用編輯(1)安裝前應(yīng)檢查繼電器的額定電流和整定電流值是否符合實際使用要求，繼電器的動作部分是否靈活、可靠，外罩及殼體是否有損壞或缺件等情況。(2)安裝后應(yīng)在觸點不通電的情況下，使吸引線圈通電操作幾次?？蠢^電器動作是否可靠。(3)定期檢查繼電器各零部件是否有松動及損壞現(xiàn)象，并保持觸點的清潔。[1]欠電流繼電器斷相保護電路編輯電路如圖7-9所示，電路采用三只欠電流繼電器作斷相保護。工作原理：按下起動按鈕SBl，接觸器KM線圈得電動作，主觸點閉合，電動機起動。欠電流繼電器KAl、KAKA3動作。
天津DACO接觸器DOC-40,DOC-48,DOC-50,DOC-65,DOC-75,