ABB U3BSE043660R1

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描述

ABB U3BSE043660R1

由于不正確的起動和過大的負載轉(zhuǎn)矩以及頻繁的反接制動,都會引起過電流。為了限制電動機的起動或制動電流過大,常常在直流電動機的電樞回路中或交流繞線轉(zhuǎn)子電動機的轉(zhuǎn)子回路中串入附加的電阻。若在起動或制動時,此附加電阻已被短接,就會造成很大的起動或制動電流。另外,電動機的負載劇烈增加,也要引起電動機過大的電流,過電流的危害與短路電流的危害一樣,只是程度上的不同,過電流保護常用斷路器或電磁式過電流繼電器。將過電流繼電器串聯(lián)在被保護的電路中,當發(fā)生過電流時,過電流繼電器KA線圈中的電流達到其動作值,于是吸動銜鐵,打開其常閉觸點,使接觸器KM釋放,從而切斷電源。這里過電流繼電器只是一個檢測電流大小的元件,切斷過電流還是靠接觸器。如果用斷路器實現(xiàn)過電流保護.則檢測電流大小的元件就是斷路器的電流檢波線圈,而斷路器的主觸點用以切斷過電流。

熱保護又稱長期過載保護。所謂過載是指電動機的電流大于其額定電流。造成過載的原因很多,如負載過大、三相電動機單相運行、欠電壓運行等。當長期過載時,電動機發(fā)熱,使溫度超過允許值,電動機的絕緣材料就要變脆,壽命降低、嚴重時使電動機損壞,因此必須予以保護。常用的過載保護元件是熱繼電器。熱繼電器可以滿足這樣的要求:當電動機為額定電流時,電動機為額定溫升,熱繼電器不動作;在過載電流較小時,熱繼電器要經(jīng)過較長時間才動作;過載電流較大時,熱繼電器則經(jīng)過較短時間就會動作。
? ? 由于熱慣性的原因,熱繼電器不會因電動機短時過載沖擊電流或短路電流而立即動作。所以在使用熱繼電器作過載保護的同時,還必須設有短路保護,并且選作短路保護的熔斷器熔體的額定電流不應超過4倍熱繼電器發(fā)熱元件的額定電流。當電動機正在運行時,如果電源電壓因某種原因消失,為了防止電源恢復時電動機自行起動的保護稱為零電壓保護,零電壓保護常選用零壓保護繼電器KHV。當電動機正常運行時,電源電壓過分地降低將引起一些電器釋放,造成控制線路不正常工作,可能產(chǎn)生事故。因此,需要在電源電壓降到一定允許值以下時,將電源切斷,這就是欠電壓保護。欠電壓保護常用電磁式欠電壓繼電器K當電動機正常運行時,電源電壓過分地降低將引起一些電器釋放,造成控制線路不正常工作,可能產(chǎn)生事故。因此,需要在電源電壓降到一定允許值以下時,將電源切斷,這就是欠電壓保護。欠電壓保護常用電磁式欠電壓繼電器KV來實現(xiàn)。欠電壓繼電器的線圈跨接在電源兩相之間,電動機正常運行時,當線路中出現(xiàn)欠電壓故障或零壓時,欠電壓繼電器的線圈KV得電,其常閉觸點打開,接觸器KM釋放,電動機被切斷電源。對于按鈕起動并具有自鎖環(huán)節(jié)的電路,本身已具有零電壓保護功能,不必再考慮零電壓保護。

產(chǎn)品承諾:
保?證?全新原裝進口,
保?證?安全準時發(fā)貨,
保?證售后服務質(zhì)量,
優(yōu)勢價格,大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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? 專業(yè)銷售進口DCS? PLC系統(tǒng)備件模塊 15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家

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專業(yè)銷售進口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? 國內(nèi)實力庫存商家


選擇深圳長欣,選擇放心,售后無憂大量現(xiàn)貨,當天順豐發(fā)貨!
主營:本特利,英維思,伍德沃德,??怂共_、西屋、瑞恩、施耐德莫迪康、ABB、AB、西門子、摩托羅拉、GE發(fā)那科、安川、博世力士樂,ACSO,力士樂等各大品牌的DCS系統(tǒng)配件,機器人系統(tǒng)配件,大型伺服系統(tǒng)備件。

先介紹幾點經(jīng)驗。
1、先通讀一遍“系統(tǒng)手冊”(不管能不能看懂,先了解個大概,以便學習編程時查找);
2、由位控邏輯入手,逐漸增加定時、計數(shù)等條件,把或、與、非關(guān)系理順;
3、進而練習整數(shù)運算、實數(shù)運算、類型轉(zhuǎn)換;
4、量程轉(zhuǎn)換、PID調(diào)節(jié)回路的建立及P、I、D參數(shù)的理解(最好是有個物理回路驗證,比如變頻器+電機+測速傳感器);
5、循環(huán)、順序、跳轉(zhuǎn)等程序控制(盡量避免跳轉(zhuǎn),非跳不可時也是跳的越近越好);
6、中斷、通訊、位置控制....

本人以ABB工業(yè)機器人配件DSQC系列和Motorola MVME系列,GE 卡件 模塊 驅(qū)動器系列為主攻。各位電工朋友可根據(jù)自己的條件選擇適合自己的PLC品牌,由于PLC的基本框架大同小異,學會一種至于其它的學習起來也就簡單了。