保定市批發(fā)shinhwa繼電器SHDP-5115D 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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因進(jìn)線電壓過高，直流回路電壓超過了設(shè)定的極限值，在減速時(shí)電壓調(diào)節(jié)器起作用，造成制動(dòng)電流很小，電機(jī)轉(zhuǎn)速降不下來，而在軋鋼時(shí)，電網(wǎng)的負(fù)載加重，直流回路電壓低于115%的極限設(shè)定值，制動(dòng)功能恢復(fù)正常。在當(dāng)時(shí)無法降低電網(wǎng)電壓的情況下，將直流回路電壓極限設(shè)定值增至127%后，變頻器工作正常。在停產(chǎn)檢修時(shí)，我們根據(jù)電網(wǎng)的情況改變了變壓器的檔位，使變頻器的進(jìn)線電壓在允許的范圍內(nèi)，此后變頻器工作正常。(3)AEGMultiverter22/27-400變頻器上電后，操作面板上的液晶顯示屏顯示正常，但ready指示燈不亮，變頻器不能合閘查看變頻器菜單中的故障記錄時(shí)未發(fā)現(xiàn)有故障，而對(duì)操作面板上各按鍵的操作在事件記錄中則有記錄。
保定市批發(fā)shinhwa繼電器SHDP-5115D
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國外稱為SoftStarter。軟啟動(dòng)器采用三相反并聯(lián)晶閘管作為調(diào)壓器，將其接入電源和電動(dòng)機(jī)定子之間。這種電路如三相全控橋式整流電路。使用軟啟動(dòng)器啟動(dòng)電動(dòng)機(jī)時(shí)，晶閘管的輸出電壓逐漸增加，電動(dòng)機(jī)逐漸加速，直到晶閘管全導(dǎo)通，電動(dòng)機(jī)工作在額定電壓的機(jī)械特性上，實(shí)現(xiàn)平滑啟動(dòng)，降低啟動(dòng)電流，避免啟動(dòng)過流跳閘。待電機(jī)達(dá)到額定轉(zhuǎn)數(shù)時(shí)，啟動(dòng)過程結(jié)束，軟啟動(dòng)器自動(dòng)用旁路接觸器取代已完成任務(wù)的晶閘管，為電動(dòng)機(jī)正常運(yùn)轉(zhuǎn)提供額定電壓，以降低晶閘管的熱損耗，延長軟啟動(dòng)器的使用壽命，提高其工作效率，又使電網(wǎng)避免了諧波污染。軟啟動(dòng)器同時(shí)還提供軟停車功能，軟停車與軟啟動(dòng)過程相反，電壓逐漸降低，轉(zhuǎn)數(shù)逐漸下降到零，避免自由停車引起的轉(zhuǎn)矩沖擊。
保定市批發(fā)shinhwa繼電器SHDP-5115D
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無紙記錄儀是將采集的數(shù)據(jù)/運(yùn)算數(shù)據(jù)以時(shí)間為基軸記錄在儀器內(nèi)部的存儲(chǔ)系統(tǒng)中，無消耗任何常用的記錄設(shè)施，如：紙張、筆墨。記錄在儀器內(nèi)部的存儲(chǔ)數(shù)據(jù)，通過運(yùn)算、模擬后顯示在液晶屏。常用顯示用液晶屏比較廣泛。在液晶屏屏幕上，可以顯示數(shù)字顯示、棒圖顯示、曲線顯示、報(bào)警列表等。無紙記錄儀采集的數(shù)據(jù)，常用的有：溫度、壓力、流量、液位、電壓、電流、濕度、頻率、振動(dòng)、轉(zhuǎn)速等。無紙記錄儀具有無紙記錄、實(shí)時(shí)性好、精度高、帶通信、可查尋的特點(diǎn)、智能化的功能。主要應(yīng)用場合為：冶金、石油、化工、建材、造紙、食品、制藥、大專院校、生物科研、熱處理和水處理等各種工業(yè)現(xiàn)場。中文名無紙記錄儀外文名Paperlessrecorder特點(diǎn)實(shí)時(shí)性好精度高帶通信無耗材功能智能化集成度高優(yōu)勢(shì)提高質(zhì)量增強(qiáng)穩(wěn)定性目錄1優(yōu)勢(shì)2概念3應(yīng)用4分類5組態(tài)方式6結(jié)構(gòu)特點(diǎn)7技術(shù)參數(shù)8使用9放大器10串口方式11使用方法12性能指標(biāo)13組態(tài)方法14性能比較15應(yīng)用案例16現(xiàn)場情況17系統(tǒng)組成18系統(tǒng)主要功能19產(chǎn)品采購要點(diǎn)20常見故障21維修知識(shí)22注意事項(xiàng)優(yōu)勢(shì)編輯無紙記錄儀摒棄了傳統(tǒng)有紙記錄儀中使用的記錄筆和記錄紙。
保定市批發(fā)shinhwa繼電器SHDP-5115D
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頻繁啟動(dòng)的場所可取電動(dòng)機(jī)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(shí)際使用要求，繼電器的動(dòng)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(diǎn)不通電的情況下，使吸引線圈通電操作幾次?？蠢^電器動(dòng)作是否可靠。(3)定期檢查繼電器各零部件是否有松動(dòng)及損壞現(xiàn)象，并保持觸點(diǎn)的清潔。[1]欠電流繼電器斷相保護(hù)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(hù)。工作原理：按下起動(dòng)按鈕SBl，接觸器KM線圈得電動(dòng)作，主觸點(diǎn)閉合，電動(dòng)機(jī)起動(dòng)。欠電流繼電器KAl、KAKA3動(dòng)作。
保定市批發(fā)shinhwa繼電器SHDP-5115D
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它是旋轉(zhuǎn)180°后的二次電流向量與一次電流向量之間的相位差。規(guī)定二次電流向量超前于一次電流向量δ為正值，反之為負(fù)值，用分（’）為計(jì)算單位。2.10熱穩(wěn)定及動(dòng)穩(wěn)定倍數(shù)：電力系統(tǒng)故障時(shí)，電流互感器受到由于短路電流引起的巨大電流的熱效應(yīng)和電動(dòng)力作用，電流互感器應(yīng)該有能夠承受而不致受到破壞的能力，這種承受的能力用熱穩(wěn)定和動(dòng)穩(wěn)定倍數(shù)表示。熱穩(wěn)定倍數(shù)是指熱穩(wěn)定電流1s內(nèi)不致使電流互感器的發(fā)熱超過允許限度的電流與電流互感器的額定電流之比。動(dòng)穩(wěn)定倍數(shù)是電流互感器所能承受的電流瞬時(shí)值與其額定電流之比。類型區(qū)分編輯按用途分類按照用途不同，電流互感器大致可分為兩類[4]：測(cè)量用電流互感器（或電流互感器的測(cè)量繞組）：在正常工作電流范圍內(nèi)。
保定市批發(fā)shinhwa繼電器SHDP-5115D
