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IC693CBL301---IC693CBL301

IC693CBL301---IC693CBL301

也許每位自動化領(lǐng)域的同仁都有同感，在工程施工中，zui讓我們頭疼的是通信控制。通過對EMC理論的學(xué)習(xí)，我們可以解決這方面的問題。

　　我們往往會遇到這種情況，當(dāng)我們完成一個(gè)工程項(xiàng)目，經(jīng)過反復(fù)檢測沒有問題，可等到真正通電測試時(shí)，卻出現(xiàn)各種各樣的問題，不是儀表設(shè)備信號亂跳，就是找不到某個(gè)通信子站……我曾經(jīng)遇到過兩個(gè)類似的問題。

：張亮（工程師）    專線：
24小時(shí)移動專線：         【】

其中一個(gè)是市政污水行業(yè)的PLC通信問題，業(yè)主方為了節(jié)約運(yùn)行成本，將提升泵站的5臺工頻提升泵的其中兩臺換成了變頻泵，兩臺變頻器、電磁流量計(jì)、分布式I/O子站與PLC主站之間均采用Profibus現(xiàn)場總線通信，項(xiàng)目前期調(diào)試階段一切運(yùn)行正常，但沒過多久，甲方技術(shù)人員就說，變頻器正常開啟后，通信出現(xiàn)時(shí)斷時(shí)續(xù)的癥狀，并且找不到zui后一個(gè)子站了，經(jīng)過我們多名技術(shù)人員去現(xiàn)場反復(fù)測試，終于找到故障原因，原來是我們的施工人員在連接電磁流量計(jì)Profibus現(xiàn)場總線時(shí)，沒有將總線電纜屏蔽層連接到流量計(jì)主板的屏蔽螺絲上，按照EMC電磁兼容規(guī)范正常連接后，故障消除；另外一個(gè)也是找不到通信子站問題。我到項(xiàng)目現(xiàn)場后，發(fā)現(xiàn)機(jī)柜內(nèi)PS 307電源的PE保護(hù)接地端均懸空，也就是所謂的“浮地"，測量PE端子對機(jī)柜背板的交流電壓，我們看到有60多伏的電壓降出現(xiàn)，打咨詢西門子技術(shù)人員了解到，西門子PS 307zui大承受電壓降為40多伏，按照規(guī)范將PS 307保護(hù)地端子可靠接地，故障消除。類似以上的故障現(xiàn)象還有很多，這些大多是由于不規(guī)范地設(shè)計(jì)及施工造成的。由此可見，EMC電磁兼容理論在自動化控制領(lǐng)域占有很重要的地位。

520554001 Panel / Monitor

Allen-Bradley 1746-P2 Ser. C SLC500 Power Supply W/ 10 Slot Rack

Automated Logic M220NX Control Module 24VAC 3A

JC Systems 270 Controller

Robers & Co SNG 40/24 Power Supply 960VA PRI:3X360-500 3A SEC:24DC 40A

Tung Lee M540-402 Speed Control Unit

Mitsubishi FR-A520-0.75K-NA A500 Inverter 3PH 16A 2.2kW

HP Hewlett Packard, Agilent A13 5086-7957 2nd Converter

Shakeproof Screw Machine 302 Drill Press

Automated Logic UNI/30 Controller Module

Panduit F1.5X2WH6 Wiring Duct Slotted 6Ft Lenght, 28 Ducts

Powerful Technology Made Simple SS608A Servo Amplifier

Apex AER120, 0604092223 Servo Gear Reducer

Apex AER090, 2906110596 Servo Gear Reducer

Mitsubishi, Melservo MR-J2S-20B AC Servo Drive, 200 W

Flexaline, Grove Gear SP.BM0226-1 Gear Reducer 100:1

Flex-In-Line, Grove Gear SP.TX02 56/56 Gear Reducer 5:1

Busch RC0025.E506.1101 Vacuum Pump

Mitsubishi, Super Line SC-ER, 71-2137 Motor w/ Pump

GEC Machines FHP BC2208 AC Motor

Laser 6604220100 Vacuum TP w/ board

Spritzdruck DU-Q20 INJECTION PRESSURE LIMITER SWITCH

ADEPT 100 TEACH PENDANT

SABINA 7407-1 WJ-1432L POWER SUPPLY & RELAY CONTROL

OMRON CPM2A-40CDT1-D PROGRAMMABLE CONTROLLER

WATERS WAT010025 Nova-Pak Silica Column

P&H 79U797 (L) STABILITY MODULE

MOTOROLA FX100PMC NGC3Y0JEAA COMPACTPCI CARD

SABINA 7406-1 ARM FB REGULATOR

PARAGON EL SERIES REPLACEMENT TIMER ELECTRONIC CONTROL

SABINA 7405 WJ-1432J CURRENT CONTROL

FILTRONIC COMTEK CA032 F1 DIPLEXER L1 FILTER

M*C 86.850.0600.12 CIRCUIT BOARD

M*C 86.850.0600.02 CIRCUIT BOARD

M*C 86.850.0400.10 CIRCUIT BOARD

TRI-M SYSTEMS ENGINEERING Versa Tainer Dual Shock 

M*C 86.850.0200.01 CIRCUIT BOARD

M*C 86.850.1000.00 CIRCUIT BOARD

Allen-Bradley AB 113-C30AHA1F-38-3-6P-7-9D-901T Motor Starter 3HP

FESTO FENG-100-160 ADVUT-100X2-12 Linear Cylinder

FAG KUGELFISCHER NU1056 M. C5 BEARING OUTER CASE

M*C 86.850.1500.12 CIRCUIT BOARD

HP AGILENT E1497A V743 CONTROLLER

BOSCH 9810231434 DIRECTIONAL HYDRAULIC VALVE

KIRRON PSIO-BM INTERFACE CONTROLLER WITH CAN-MODUL INCLUDED

M*C 86.850.1100.00 CIRCUIT BOARD

8 MICRO SWITCH 972RS.75-A8N-L PROXIMITY SENSOR LOT

SIEMENS 307661-02 TZ CIRCUIT BOARD

M*C 86.850.0200.03 CIRCUIT BOARD

BOSCH 1070075096-307 NT200 PROCESSOR

SIEMENS 302994-02 TZ CIRCUIT BOARD

SIEMENS 6ES5210-1A651 RACK

BBC KT480 VERITRON CURRENT CONVERTER

ZEBRA Z140LM Thermal Label Printer

Kuhnke 42.585 Board

Nor NTDK16BA Nor 48DLC Board, Card

INGERSOLL-RAND PD05P-ASS-STT Diaphragm Pump

ALLEN BRADLEY 1747-L20C PROCESSOR UNIT 20 I/O

KOLLMORGEN ROL-20012-0000 SERVO CONTROLLER

2 DODGE P2B-DLAH-207/GH360271 PILLOW BLOCK BEARINGS

Micro Industries 9700389-0002B Board

M*C 86.850.0600.02 CIRCUIT BOARD Card

SABINA 7404 WJ-1432B FIRING CIRCUIT B

2 POWERSCAN 0611001-011003-200 BARCODE SCANNER LOT

Luxtron Accufiber 10 Fiber Optic Pyrometer

BREGENHORN-BUTOW BS2/120 D7000 BOARD

MITUTOYO 511-212 DIAL BORE GAUGE

PANASONIC MSMA022A1G AC SERVO MOTOR