CI627A

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描述

CI627A

对于电路板上插件电容可以用斜口钳剪断一只脚(注意从中间剪断,不要齐根剪断或齐电路板剪断),插件IC可以将电源VCC脚剪断,当剪断某一个脚时短路消失,则某个芯片或电容短路。如果是贴片IC,可将IC的电源脚用电烙铁熔化焊锡后翘起,使其离开VCC电源。更换短路元件后将剪断处或翘起处重新焊好即可。
还有一种比较快速的方法,但要用到特别的仪表—-毫欧表。大家知道,线路板上的铜箔也是有电阻的,如果PCB上铜箔厚度是35um,印制线宽1mm,则每10mm长,其电阻值为5mΩ左右,这么小的阻值,用普通的万用表是测不出来的,用毫欧表则可以测量。可假设某一个元件短路,用普通万用表测得都是0Ω,用毫欧表测得则可能是几十毫欧到几百毫欧,将表笔刚好放在短路元件两脚上测量时,得到的阻值一定最小(因为如果放在其它元件两脚上测量时,得到的阻值还包括了电路板上铜箔走线的阻值),这样通过比较毫欧表的阻值差异,当测到某个元件(如果是焊锡或铜箔有短路亦同此理)得到的阻值最小时,则该元件就是重点怀疑对象了。通过这种方法就可以快速找到故障点。电容的寿命与环境温度直接有关,环境温度越高,电容寿命越短。这个规律不但适用电解电容,也适用其它电容。所以在寻找故障电容时应重点检查和热源靠得比较近的电容,如散热片旁及大功率元器件旁的电容,离其越近,损坏的可能性就越大。曾经修过一台X光探伤仪的电源,用户反映有烟从电源里冒出来,拆开机箱后发现有一只1000uF/350V的大电容有油质一样的东西流出来,拆下来一量容量只有几十uF,还发现只有这只电容与整流桥的散热片离得最近,其它离得远的完好无损,容量正常。另外有瓷片电容出现短路的情况,也发现电容离发热部件比较近。所以在检修查找时应有所侧重。有些电容漏电比较严重,用手指触摸时甚至会烫手,这种电容必须更换。在检修时好时坏的故障时,排除了接触不良的可能性以外,一般大部分就是电容损坏引起的故障了。所以在碰到此类故障时,可以将电容重点检查一下,换掉电容后往往令人惊喜(当然也要注意电容的品质)。

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主营DCS系统配件
机器人系统配件
大型伺服系统配件
品牌:ABB   ,AB  ,GE,FOXBORO,本特利,英维思,伍德沃德,西屋,瑞恩,施耐德,西门子,摩托罗拉,安川。力士乐。ACSO,横河等进口品牌。Triconex Siemens Yaskawa ABB GE Ovation AB Foxboro Motorola Schneider XYCOM KUKA

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

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XBR-MENTPOD8-01 Brocade Silkworm 5300 16 Port Upgrade

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

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Brocade SilkWorm BR-7500-0001 4Gb Fibre Channel Switch

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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1 Year Brocade Silkworm Maintenance Support 5000 Series

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Brocade Silkworm 4100, 32-port with 32 sfp’s Installed

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

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

Brocade SilkWorm 3014 FC Switch PowerEdge 1855 SW3014
DELL T8560 PE1855 FC2 SWITCH MODULE
One-day shipping available

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Enlarge
Brocade SilkWorm 3200 8 Port 1Gbit/s 2Gbit/s FC SWITCH

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BR-2802-0008

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Enlarge
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Brocade Silkworm 3800

Brocade SilkWorm 3800 Power Sup 60-0000212-01, SP471-1A

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.

Hp A5624-62001 Brocade Silkworm 2800 Fibre Chanl Switch

Brocade SilkWorm 2250 16 Port Fibre Channel Switch
One-day shipping available

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Brocade Silk Worm 3200 Fibre Channel Switch Silkworm

Brocade SilkWorm 12000 24000 Power Supply 23-0000006-02
One-day shipping available

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Brocade, Silkworm Switch, Slid Rack Mount Kit

Brocade Silkworm 3200 8 port 2Gbit Fiber Channel Switch

BROCADE 3900 SILKWORM 32 PORT FIBRE CHANNEL SWITCH

Brocade Silkworm 2800 BP-2801 Fibre GBIC Network Switch

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Expedited shipping available

Brocade SilkWorm 3800 16-Port 2GB Fibre Channel Switch

Brocade SilkWorm 2800 – 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

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Dell Brocade Silkworm 3800 FanTray Module 7P241

NEW! Brocade Silkworm 2800 2400 LCD Display EW10058BMO

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Brocade Hot-Swap Fan Module 60-0007000-04 Silkworm 3900
Expedited shipping available

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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


选择深圳长欣,选择放心,售后无忧大量现货,当天顺丰发货!
主营:本特利,英维思,伍德沃德,福克斯波罗、西屋、瑞恩、施耐德莫迪康、ABB、AB、西门子、摩托罗拉、GE发那科、安川、博世力士乐,ACSO,力士乐等各大品牌的DCS系统配件,机器人系统配件,大型伺服系统备件。

先介绍几点经验。
1、先通读一遍“系统手册”(不管能不能看懂,先了解个大概,以便学习编程时查找);
2、由位控逻辑入手,逐渐增加定时、计数等条件,把或、与、非关系理顺;
3、进而练习整数运算、实数运算、类型转换;
4、量程转换、PID调节回路的建立及P、I、D参数的理解(最好是有个物理回路验证,比如变频器+电机+测速传感器);
5、循环、顺序、跳转等程序控制(尽量避免跳转,非跳不可时也是跳的越近越好);
6、中断、通讯、位置控制....

本人以ABB工业机器人配件DSQC系列和Motorola MVME系列,GE 卡件 模块 驱动器系列为主攻。各位电工朋友可根据自己的条件选择适合自己的PLC品牌,由于PLC的基本框架大同小异,学会一种至于其它的学习起来也就简单了。