E8408A

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描述

E8408A

?交流接觸器的選用,應根據(jù)負荷的類型和工作參數(shù)合理選用。具體分為以下步驟:
? ? 1.選擇接觸器的類型
? ? 交流接觸器按負荷種類一般分為一類、二類、三類和四類,分別記為AC1、AC2、AC3和AC4。一類交流接觸器對應的控制對象是無感或微感負荷,如白熾燈、電阻爐等;二類交流接觸器用于繞線式異步電動機的起動和停止;三類交流接觸器的典型用途是鼠籠型異步電動機的運轉和運行中分斷;四類交流接觸器用于籠型異步電動機的起動、反接制動、反轉和點動。
? ? 2.選擇接觸器的額定參數(shù)
? ? 根據(jù)被控對象和工作參數(shù)如電壓、電流、功率、頻率及工作制等確定接觸器的額定參數(shù)。
? ? 1)接觸器的線圈電壓,一般應低一些為好,這樣對接觸器的絕緣要求可以降低,使用時也較安全。但為了方便和減少設備,常按實際電網(wǎng)電壓選取。
? ? 2)電動機的操作頻率不高,如壓縮機、水泵、風機、空調(diào)、沖床等,接觸器額定電流大于負荷額定電流即可。接觸器類型可選用CJl0、CJ20等。
? ? 3)對重任務型電機,如機床主電機、升降設備、絞盤、破碎機等,其平均操作頻率超過100次/min,運行于起動、點動、正反向制動、反接制動等狀態(tài),可選用CJl0Z、CJl2型的接觸器。為了保證電壽命,可使接觸器降容使用。選用時,接觸器額定電流大于電機額定電流。
? ? 4)對特重任務電機,如印刷機、鏜床等,操作頻率很高,可達600~12000次/h,經(jīng)常運行于起動、反接制動、反向等狀態(tài),接觸器大致可按電壽命及起動電流選用,接觸器型號選CJl0Z、CJl2等。
? ? 5)交流回路中的電容器投入電網(wǎng)或從電網(wǎng)中切除時,接觸器選擇應考慮電容器的合閘沖擊電流。一般地,接觸器的額定電流可按電容器的額定電流的1.5倍選取,型號選CJ10、CJ20等。
? ? 6)用接觸器對變壓器進行控制時,應考慮浪涌電流的大小。例如交流電弧焊機、電阻焊機等,一般可按變壓器額定電流的2倍選取接觸器,型號選CJl0、CJ20等。
? ? 7)對于電熱設備,如電阻爐、電熱器等,負荷的冷態(tài)電阻較小,因此起動電流相應要大一些。選用接觸器時可不用考慮(起動電流),直接按負荷額定電流選取。型號可選用CJl0、CJ20等。
? ? 8)由于氣體放電燈起動電流大、起動時間長,對于照明設備的控制,可按額定電流1.1~1.4倍選取交流接觸器,型號可選CJl0、CJ20等。
? ? 9)接觸器額定電流是指接觸器在長期工作下的最大允許電流,持續(xù)時間≤8h,且安裝于敞開的控制板上,如果冷卻條件較差,選用接觸器時,接觸器的額定電流按負荷額定電流的110%~120%選取。對于長時間工作的電機,由于其氧化膜沒有機會得到清除,使接觸電阻增大,導致觸點發(fā)熱超過允許溫升。實際選用時,可將接觸器的額定電流減小30%使用。

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保?證?安全準時發(fā)貨,
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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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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、非關系理順;
3、進而練習整數(shù)運算、實數(shù)運算、類型轉換;
4、量程轉換、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、跳轉等程序控制(盡量避免跳轉,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。