946-A4v-2D-2C0-380E

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946-A4v-2D-2C0-380E

要徹底排除電氣故障，必須清楚故障發(fā)生的原因，要迅速查明故障原因，除不斷在工作中積累經(jīng)驗(yàn)外，更重要的是能從理論上分析、解釋產(chǎn)生故障的原因，即“知其然，還要知其所以然”，用理論指導(dǎo)自己的操作，靈活運(yùn)用排隊(duì)故障的各種方法。專業(yè)理論知識(shí)很多電氣現(xiàn)象，必須領(lǐng)先專業(yè)理論知識(shí)才能真正弄懂、弄通。維修電工與其他工種比較而言，理論性更強(qiáng)，有時(shí)候沒有理論的指導(dǎo)，很多工作根本無法進(jìn)行。實(shí)際工作中，往往動(dòng)腦筋的時(shí)間比動(dòng)手的時(shí)間還長，一但找出故障點(diǎn)，修復(fù)是比較簡單的。
了解設(shè)備的運(yùn)動(dòng)形式對(duì)電氣提出的要求，弄懂并熟練掌握設(shè)備的電氣工作原理，熟練掌握電氣工作原理，并比較該設(shè)備的電氣控制特點(diǎn)，是排除故障非常重要的基礎(chǔ)。熟悉掌握設(shè)備復(fù)合控制系統(tǒng)和電氣控制技術(shù)的主要內(nèi)容，了解其典型性、綜合性與復(fù)雜性。了解各電氣元件在設(shè)備的具體位置及線路的布局實(shí)現(xiàn)電氣原理圖與實(shí)際配線的一一對(duì)應(yīng)，是提高故障排除速度的基礎(chǔ)。做到這一點(diǎn)，可以對(duì)設(shè)備有一個(gè)進(jìn)一步的了解，并且在排除故障測(cè)量時(shí)，能選擇有效的測(cè)試點(diǎn)，防止誤判斷，以迅速判斷、縮小故障范圍。有了一定的理論基礎(chǔ)，掌握了設(shè)備的工作原理，為排除故障做好了充分的準(zhǔn)備，操作對(duì)有效的進(jìn)行分析和找出故障點(diǎn)，還需具備一定的手段，這就是排除故障的一般方法。電阻法通常是指利用萬用表的電阻擋，測(cè)量線路、觸點(diǎn)等是否通斷的一種方法，有時(shí)也用萬用表或電橋測(cè)量線圈的阻值是否符合標(biāo)稱值，也用兆歐表測(cè)量相與相、相與地之間的絕緣電阻等。測(cè)量時(shí)，要注意選擇量程（一般測(cè)量通路時(shí)，選擇較低檔位）；要較表；要注意有沒有其他回路，以免引起誤判斷；更要注意嚴(yán)禁帶電測(cè)量，這是一種常用的方法。
電壓法是指利用萬用表相應(yīng)的電壓擋，測(cè)量電路中電壓值的方法，通常測(cè)量時(shí)，有時(shí)測(cè)量電壓、負(fù)載的電壓（即兩表筆間一直飲食負(fù)載，也有時(shí)測(cè)量開路電壓，以判定線路是否正常。測(cè)量時(shí)要注意表的擋位，選擇合適的量程，測(cè)量直流電時(shí)，要注意正負(fù)極性。這也是一種較常用的方法。電流法即通過測(cè)量線路中的電流是否符合正常值，以判定故障原因。弱電回路，常采用將電流表或萬用表電流擋串接在電路中進(jìn)行測(cè)量，強(qiáng)電回路，常利用鉗形電流表檢測(cè)。替換法在懷疑某個(gè)器件有故障、但不能確定，且有代用件時(shí)，可替換試驗(yàn)，看故障是否恢復(fù)。
短接法適用于低電壓、小電流回路中，將情緒適中的點(diǎn)用粗導(dǎo)線短接進(jìn)行試驗(yàn)的方法。（工控資料窩）但必須確定短接時(shí)不會(huì)造成短路和短接后的一但工作，不會(huì)造成危害。禁止帶電短接，一般初學(xué)者不宜采用。
直接檢查法在了解故障原因或根據(jù)經(jīng)驗(yàn)經(jīng)常出現(xiàn)故障幾率較高、再就是一些特殊故障，可以直接檢查所懷疑的故障點(diǎn)。
儀器測(cè)試法借助各種儀器儀表測(cè)量各種參數(shù)，如用示波器觀察波形的變化，以便分析故障的原因。多用于弱電線路中。逐步排除法如有短路現(xiàn)象出現(xiàn)時(shí)，可逐步切除部分線路以確定故障范圍和故障點(diǎn)。
調(diào)整參數(shù)法有些線路中元器件無損壞，線路接線良好，只是由于某些物理量（如時(shí)間、位移、電流、電阻值、溫度反饋信號(hào)強(qiáng)弱等）調(diào)整的不合適，而使系統(tǒng)不能正常工作，這時(shí)應(yīng)根據(jù)電氣工作原路及設(shè)備的具體情況進(jìn)行調(diào)整。比較、分析、判斷法它是根據(jù)系統(tǒng)的工作原理、控制環(huán)節(jié)的動(dòng)作程序以及它們之間的邏輯關(guān)系，結(jié)合故障現(xiàn)象，進(jìn)行比較、分析和判斷，減少測(cè)量、檢查等環(huán)節(jié)，迅速判斷故障范圍。

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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(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)起來也就簡單了。

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