1336-PB-SP2D

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描述

1336-PB-SP2D

變頻器維修離不開對(duì)電阻的測(cè)量，維修人員會(huì)借助測(cè)量?jī)x表，把被測(cè)量對(duì)象直接或間接地與同類已知單位進(jìn)行比較，以取得用數(shù)值和單位共同表示的測(cè)量值。
電阻是各種電子元器件和電路的基本參量，利用萬用表測(cè)量電子元器件或電路各點(diǎn)之間的電阻值來判斷故障是一種很常用的方法。測(cè)量電阻值時(shí)，有“在線”和“離線”兩種基本方式?！霸诰€”測(cè)量時(shí)，需要考慮被測(cè)元器件受其他并聯(lián)支路的影響，應(yīng)對(duì)照原理圖對(duì)測(cè)量結(jié)果進(jìn)行分析判斷。“離線”測(cè)量時(shí)，需要將被測(cè)元器件或電路從整個(gè)電路或印制電路板上脫焊下來，操作較麻煩但結(jié)果準(zhǔn)確可靠。
用電阻法測(cè)量集成電路時(shí)，通常需先將一根表筆接地，用另一根表筆測(cè)各引腳對(duì)地的電阻值，然后交換表筆再測(cè)一次。將測(cè)量值與正常值(有些維修資料已給出，也可自己收集)進(jìn)行比較，相差較大者往往是故障所在部位(不一定是集成電路壞)。電阻法對(duì)確定開關(guān)、接插件、導(dǎo)線、印制電路板布線的通/斷及電阻變質(zhì)，電容器短路，電感線圈斷路等故障非常有效而且快捷，但對(duì)晶體管、集成電路及電路單元來說，一般不能直接判定其故障，需要進(jìn)行對(duì)比分析或兼用其他方法。由于電阻法為不給電路通電的測(cè)量方法，故可將測(cè)量風(fēng)險(xiǎn)降到最小。使用萬用表測(cè)量電阻時(shí)，應(yīng)注意以下事項(xiàng)。
使用電阻法時(shí)，應(yīng)在線路斷電、大電容放電的情況下進(jìn)行，否則結(jié)果不準(zhǔn)確，還可能損壞萬用表。
在檢測(cè)低電壓供電的集成電路(5V)時(shí)，應(yīng)避免使用指針式萬用表的10k擋。
在線測(cè)量時(shí)，應(yīng)用萬用表表筆交替測(cè)試，對(duì)比分析。
電阻由于其結(jié)構(gòu)上的特點(diǎn)，存在引線電感和分布電容。當(dāng)它工作于低頻時(shí)電阻分量起主要作用，電抗分量可以忽略不計(jì);但當(dāng)工作頻率升高時(shí)其電抗分量就不能忽略不計(jì)了。此時(shí)，對(duì)于工作在交流電路中的電阻，由于集膚效應(yīng)、渦流損耗等原因，其等效電阻將隨頻率的不同而不同。實(shí)驗(yàn)證明，當(dāng)頻率在1kHz以下時(shí)，電阻的交流阻值和直流阻值的差值小于1xl(T4，隨著頻率的升高，兩者的差值也隨之增大。

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選擇深圳長(zhǎng)欣，選擇放心，售后無憂大量現(xiàn)貨，當(dāng)天順豐發(fā)貨！
主營(yíng)：本特利，英維思，伍德沃德，?？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(jiǎn)單了。

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