P0961BD-GW30B

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描述

P0961BD-GW30B

熱繼電器是利用電流的熱效應(yīng)原理實(shí)現(xiàn)電機(jī)的過(guò)載保護(hù)的。
電動(dòng)機(jī)在工作時(shí),當(dāng)負(fù)載過(guò)大、電壓過(guò)低或發(fā)生一相斷路故障時(shí),電動(dòng)機(jī)的電流都要增大,其值往往超過(guò)額定電流。如果超過(guò)不多,電路中熔斷器的熔體不會(huì)熔斷,但時(shí)間長(zhǎng)了會(huì)影響電動(dòng)機(jī)的壽命,甚至燒毀電動(dòng)機(jī),因此需要有過(guò)載保護(hù)。熱繼電器用于電動(dòng)機(jī)的過(guò)載保護(hù),它是利用電流熱效應(yīng)使雙金屬片受熱后彎曲,通過(guò)聯(lián)動(dòng)機(jī)構(gòu)使觸點(diǎn)動(dòng)作的自動(dòng)電器。圖1-23是熱繼電器的結(jié)構(gòu)及圖形符號(hào)。

它由發(fā)熱元件、雙金屬片、觸點(diǎn)及一套傳動(dòng)和調(diào)整機(jī)構(gòu)組成。發(fā)熱元件是一段阻值不大的電阻絲,串接在被保護(hù)電動(dòng)機(jī)的主電路中。雙金屬片由兩種不同熱膨脹系數(shù)的金屬片輾壓而成。圖中所示的雙金屬片,下層一片的熱膨脹系數(shù)大,上層的小。當(dāng)電動(dòng)機(jī)過(guò)載時(shí),通過(guò)發(fā)熱元件的電流超過(guò)整定電流,雙金屬片受熱向上彎曲脫離扣板,使常閉觸點(diǎn)斷開。由于常閉觸點(diǎn)是接在電動(dòng)機(jī)的控制電路中的,它的斷開會(huì)使得與其相接的接觸器線圈斷電,從而接觸器主觸點(diǎn)斷開,電動(dòng)機(jī)的主電路斷電,實(shí)現(xiàn)了過(guò)載保護(hù)。

熱繼電器的主要技術(shù)數(shù)據(jù)是整定電流。整定電流是指長(zhǎng)期通過(guò)發(fā)熱元件而不致使熱繼電器動(dòng)作的最大電流。當(dāng)發(fā)熱元件中通過(guò)的電流超過(guò)整定電流值的20%時(shí),熱繼電器應(yīng)在20分鐘內(nèi)動(dòng)作。熱繼電器的整定電流大小可通過(guò)整定電流旋鈕來(lái)改變。選用和整定熱繼電器時(shí)一定要使整定電流值與電動(dòng)機(jī)的額定電流一致。
由于熱繼電器是受熱而動(dòng)作的,熱慣性較大,因而即使通過(guò)發(fā)熱元件的電流短時(shí)間內(nèi)超過(guò)整定電流幾倍,熱繼電器也不會(huì)立即動(dòng)作。只有這樣,在電動(dòng)機(jī)起動(dòng)時(shí)熱繼電器才不會(huì)因起動(dòng)電流大而動(dòng)作,否則電動(dòng)機(jī)將無(wú)法起動(dòng)。反之,如果電流超過(guò)整定電流不多,但時(shí)間一長(zhǎng)也會(huì)動(dòng)作。由此可見(jiàn),熱繼電器與熔斷器的作用是不同的,熱繼電器只能作過(guò)載保護(hù)而不能作短路保護(hù),而熔斷器則只能作短路保護(hù)而不能作過(guò)載保護(hù)。在一個(gè)較完善的控制電路中,特別是容量較大的電動(dòng)機(jī)中,這兩種保護(hù)都應(yīng)具備。

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


選擇深圳長(zhǎng)欣,選擇放心,售后無(wú)憂大量現(xiàn)貨,當(dāng)天順豐發(fā)貨!
主營(yíng):本特利,英維思,伍德沃德,福克斯波羅、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(lè),ACSO,力士樂(lè)等各大品牌的DCS系統(tǒng)配件,機(jī)器人系統(tǒng)配件,大型伺服系統(tǒng)備件。

先介紹幾點(diǎn)經(jīng)驗(yàn)。
1、先通讀一遍“系統(tǒng)手冊(cè)”(不管能不能看懂,先了解個(gè)大概,以便學(xué)習(xí)編程時(shí)查找);
2、由位控邏輯入手,逐漸增加定時(shí)、計(jì)數(shù)等條件,把或、與、非關(guān)系理順;
3、進(jìn)而練習(xí)整數(shù)運(yùn)算、實(shí)數(shù)運(yùn)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(gè)物理回路驗(yàn)證,比如變頻器+電機(jī)+測(cè)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(shí)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(jī)器人配件DSQC系列和Motorola MVME系列,GE 卡件 模塊 驅(qū)動(dòng)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(xué)會(huì)一種至于其它的學(xué)習(xí)起來(lái)也就簡(jiǎn)單了。