FBMSVH

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描述

FBMSVH

對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,其電阻值為5mΩ左右,這么小的阻值,用普通的萬用表是測不出來的,用毫歐表則可以測量。可假設(shè)某一個(gè)元件短路,用普通萬用表測得都是0Ω,用毫歐表測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量時(shí),得到的阻值一定最?。ㄒ?yàn)槿绻旁谄渌赡_上測量時(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:
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保?證?安全準(zhǔn)時(shí)發(fā)貨,
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優(yōu)勢價(jià)格,大量現(xiàn)貨。

主營DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
品牌:ABB???,AB??,GE,FOXBORO,本特利,英維思,伍德沃德,西屋,瑞恩,施耐德,西門子,摩托羅拉,安川。力士樂。ACSO,橫河等進(jìn)口品牌。Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA

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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XBR-MENTPOD8-01 Brocade Silkworm 5300 16 Port Upgrade

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BR-48KTRK-01 Brocade Silkworm 48000 ISL Trunking

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

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Brocade SilkWorm 3800 16-Port Fiber Channel Switch

BROCADE SILKWORM 3250 8 Port 1/2Gb/s FC-AL SWITCH

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

Brocade SilkWorm 2800 Fibre Channel Switch

Brocade SilkWorm 3800 16 Port Fibre Channel DL-3802

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1 Year Brocade Silkworm Maintenance Support 200E Series
1-5 Year Extended Service “Advance Replacement Support”

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One-day shipping available

BROCADE SILKWORM 2800 FIBRE CHANNEL SWITCH WITH GBIC
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BR-3850 Brocade Silkworm 3850 16 Port Fabric Switch 2AC

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Brocade SilkWorm 24000 16-Port Blade 60-1002121-04
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Brocade 1200 16 Port blade 250-006-900 silkworm 12000

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Brocade SilkWorm 200E 16-Port 4Gb/s Fibre Switch

Brocade SilkWorm 3900 Switch with Licenses, SFP & Rails

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Brocade 60-0000319-01 Silkworm Power Supply
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Enlarge
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Brocade SilkWorm 24000 16-Port Blade 60-1002121-04
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Brocade SilkWorm 3250 Fabric Switch

New Brocade Silkworm 12000 16 Port XBR-12000-0101

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

Brocade SilkWorm 24000 16-Port Blade 60-0002121-05
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SYSTEM BOARD BROCADE SILKWORM 2400 SWITCH 40-0000004-06

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Enlarge
BROCADE SILKWORM 2400 BR-2402-0013 FIBER CHANNEL SWITCH

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XHP-000012 A5624A BROCADE SILKWORM 2800 MAIN SYSTEM BRD
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Brocade Silkworm 2800 Fibre Channel Switch
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BROCADE SilkWorm 3250 Fibre Channel Switch w/8 GBIC

Brocade Silkworm Rack Mount Kit SW2000 XBR-000016 – NEW

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Hp A5624-62001 Brocade Silkworm 2800 Fibre Chanl Switch

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Brocade Silkworm 2800 BP-2801 Fibre GBIC Network Switch

XHP-000013 A5624A BROCADE SILKWORM 2800 FAN TRAY ASSY.
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Brocade SilkWorm 3800 16-Port 2GB Fibre Channel Switch

Brocade SilkWorm 2800 – switch

Brocade Silkworm 2800 16 Port Fibre Channel Switch

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

Brocade Silkworm 3200 Fibre Switch

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Brocade Silkworm 2800 BR-2801 Fibre Channel Switch

Brocade Silkworm 3800 Fan Tray Assembly Module FJ00

Brocade SilkWorm 3800 FanTray, FJ00, 60-0001005-002

BROCADE SILKWORM 3800 Fan Tray Assembly Module FJ00

Brocade Hot-Swap Fan Module 60-0007000-04 Silkworm 3900
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Brocade Silkworm 3900 Switch Fan Module 60-0007000

XHP-000010 A5624A BROCADE SILKWORM 2800 POWER SUPPLY

Brocade Silkworm 1000 SAN Switch Fiber Channel E176896

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

BROCADE SILKWORM 2040

Brocade Silkworm 2040 Fibre Channel Switch
One-day shipping available

Brocade SilkWorm 2240 Fiber Channel Switch

Brocade Silkworm 2800 16-Port Fiber Channel Switch

Brocade Silkworm 3800 Fan Tray Assembly Module FJ00

BROCADE SILKWORM 2400 FIBRE CHANNEL SWITCH W/ 23L3336


選擇深圳長欣,選擇放心,售后無憂大量現(xiàn)貨,當(dāng)天順豐發(fā)貨!
主營: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”(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)會一種至于其它的學(xué)習(xí)起來也就簡單了。