369-C100

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描述

369-C100

對(duì)于電路板上插件電容可以用斜口鉗剪斷一只腳(注意從中間剪斷,不要齊根剪斷或齊電路板剪斷),插件IC可以將電源VCC腳剪斷,當(dāng)剪斷某一個(gè)腳時(shí)短路消失,則某個(gè)芯片或電容短路。如果是貼片IC,可將IC的電源腳用電烙鐵熔化焊錫后翹起,使其離開VCC電源。更換短路元件后將剪斷處或翹起處重新焊好即可。
還有一種比較快速的方法,但要用到特別的儀表—-毫歐表。大家知道,線路板上的銅箔也是有電阻的,如果PCB上銅箔厚度是35um,印制線寬1mm,則每10mm長(zhǎng),其電阻值為5mΩ左右,這么小的阻值,用普通的萬用表是測(cè)不出來的,用毫歐表則可以測(cè)量??杉僭O(shè)某一個(gè)元件短路,用普通萬用表測(cè)得都是0Ω,用毫歐表測(cè)得則可能是幾十毫歐到幾百毫歐,將表筆剛好放在短路元件兩腳上測(cè)量時(shí),得到的阻值一定最?。ㄒ?yàn)槿绻旁谄渌赡_上測(cè)量時(shí),得到的阻值還包括了電路板上銅箔走線的阻值),這樣通過比較毫歐表的阻值差異,當(dāng)測(cè)到某個(gè)元件(如果是焊錫或銅箔有短路亦同此理)得到的阻值最小時(shí),則該元件就是重點(diǎn)懷疑對(duì)象了。通過這種方法就可以快速找到故障點(diǎn)。電容的壽命與環(huán)境溫度直接有關(guān),環(huán)境溫度越高,電容壽命越短。這個(gè)規(guī)律不但適用電解電容,也適用其它電容。所以在尋找故障電容時(shí)應(yīng)重點(diǎn)檢查和熱源靠得比較近的電容,如散熱片旁及大功率元器件旁的電容,離其越近,損壞的可能性就越大。曾經(jīng)修過一臺(tái)X光探傷儀的電源,用戶反映有煙從電源里冒出來,拆開機(jī)箱后發(fā)現(xiàn)有一只1000uF/350V的大電容有油質(zhì)一樣的東西流出來,拆下來一量容量只有幾十uF,還發(fā)現(xiàn)只有這只電容與整流橋的散熱片離得最近,其它離得遠(yuǎn)的完好無損,容量正常。另外有瓷片電容出現(xiàn)短路的情況,也發(fā)現(xiàn)電容離發(fā)熱部件比較近。所以在檢修查找時(shí)應(yīng)有所側(cè)重。有些電容漏電比較嚴(yán)重,用手指觸摸時(shí)甚至?xí)C手,這種電容必須更換。在檢修時(shí)好時(shí)壞的故障時(shí),排除了接觸不良的可能性以外,一般大部分就是電容損壞引起的故障了。所以在碰到此類故障時(shí),可以將電容重點(diǎn)檢查一下,換掉電容后往往令人驚喜(當(dāng)然也要注意電容的品質(zhì))。

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,
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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
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BR-48000-R0000 Brocade Silkworm 48000 Chassis cont, pwr

Brocade BR-48000-R0000 Silkworm Chassis, 2 x cont,2xPWR

Brocade BR-48000-R0000 Silkworm Chassis, 2 x cont,2xPWR

XBR-MENTPOD8-01 Brocade Silkworm 5300 16 Port Upgrade

Brocade BR-6400 SilkWorm 6400 w/ 6x BR-2250 Switches

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Brocade BR-4140 SilkWorm 4100 32-Ports SAN FC Switch

BROCADE SILKWORM 5000 BR-5040 32-PORT 4GB SAN SWITCH

XBR-MIDRPOD8-01 Brocade Silkworm 5100 8 Pt Upgrd 8G SFP

Brocade Silkworm 3900 32Port Fabric Switch BR-3902-0001

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Brocade BR-4120 SilkWorm 4100 32-Ports SAN FC Switch

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1 Year Brocade Silkworm Maintenance Support 4900 Series

Brocade SilkWorm 3900 Enterprise Fibre Switch Refurb

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1 Year Brocade Silkworm Maintenance Support 5000 Series

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Brocade SilkWorm 2800 Fiber Switch 16 Port NO PASS

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BR-3802-0001 Brocade Silkworm 3800 16 ports, 2Gb SFPs

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2 Qty Brocade Silkworm 3900 32 port Switch w sfp/rails

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1-5 Year Extended Service “Advance Replacement Support”

Brocade SilkWorm 3014 FC Switch PowerEdge 1855 SW3014
DELL T8560 PE1855 FC2 SWITCH MODULE
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BROCADE SILKWORM 2800 FIBRE CHANNEL SWITCH WITH GBIC
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Brocade SilkWorm 200E 16-Port 4Gb/s Fibre Switch

Brocade SilkWorm 3900 Switch with Licenses, SFP & Rails

BROCADE SILKWORM 3200 VL2 * 8 CHANNEL FIBER SWITCH

Brocade 60-0000319-01 Silkworm Power Supply
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BROCADE SILKWORM 3800 16 PT BR-3802-0011

BROCADE SILKWORM 3900 FAN 60-0007000-04

Brocade Silkworm 3850 / DS-16B3 Switch

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A5624-62001 Hp 16 Port Brocade Silkworm 2800 Fc SwitcH
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Brocade Silkworm 3900 2xFAN with Tray Hot Swap Module

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Dell Brocade Silkworm PowerEdge Fiber Switch N9473

Brocade silkworm 12000 control processor 250-007-900

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Brocade 3800 Brocade 3800 Silkworm Fibre Channel Switch
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Enlarge
Brocade SilkWorm 3200 8 Port 1Gbit/s 2Gbit/s FC SWITCH

Brocade SilkWorm 24000 16-Port Blade 60-1002121-04
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Brocade Silkworm 12000 250-006-900 Br-12000-0101 + Gbic
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New Brocade Silkworm 12000 16 Port XBR-12000-0101

Brocade Silkworm 3250 EMC DS-8B3 8-Port Fibre Switch 2G

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BR-2802-0008 Brocade Silkworm 2800 1Gbps SAN Switch

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Brocade Silkworm 2800 Fiber Channel Switch FTR-8519P-5A
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Enlarge
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Brocade Silkworm 2240 Fibre Channel Switch 21H9837 GBIC

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Brocade SilkWorm 3900 Fan Assembly Tray New Pull

SilkWorm Brocade 3200 Fibre Channel Switch (1508137)

Brocade SilkWorm 2800 Fibre Channel 16 Port Switch

BROCADE SILKWORM 3900 POWER SUPPLY 60-0000739-02

Brocade SilkWorm 3200 Fibre Channel Switch BR-3200 Ref.

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Brocade, Silkworm Switch, Slid Rack Mount Kit

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BROCADE 3900 SILKWORM 32 PORT FIBRE CHANNEL SWITCH

Brocade Silkworm 2800 BP-2801 Fibre GBIC Network Switch

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Brocade SilkWorm 3800 16-Port 2GB Fibre Channel Switch

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Brocade Silkworm 3900, 32-port with 32 sfp’s Installed

Brocade SilkWorm 3200 Fibre Channel SAN Switch

LOT 2 Brocade Silkworm 3200 8-Port Fibre Channel Switch

Brocade Silkworm 2400 Fibre Channel Switch 8 Ports FC

Dell Brocade Silkworm 3800 FanTray Module 7P241

NEW! Brocade Silkworm 2800 2400 LCD Display EW10058BMO

Brocade SilkWorm 3250 Fibre Channel Switch

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Brocade Silkworm 3800 Fan Tray Assembly Module FJ00

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HP A5624 – 62001 BROCADE SILKWORM 2800 16-PORT SWITCH g

HP A5624 – 62001 BROCADE SILKWORM 2800 16-PORT SWITCH f

HP A5624 – 62001 BROCADE SILKWORM 2800 16-PORT SWITCH e

HP A5624 – 62001 BROCADE SILKWORM 2800 16-PORT SWITCH d

HP A5624 – 62001 BROCADE SILKWORM 2800 16-PORT SWITCH c

HP A5624 – 62001 BROCADE SILKWORM 2800 16-PORT SWITCH b

HP A5624 – 62001 BROCADE SILKWORM 2800 16-PORT SWITCH a

Lambda/Brocade Silkworm 3800 Power Supply PSU-G0109

Brocade SilkWorm 3800 Fibre Channel Switch

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Brocade Silkworm 2040 Fibre Channel Switch
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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,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,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。