SIEMENS 505-6108

　(1) 熱工人員檢查發(fā)現(xiàn)，DCS 1號柜的24VDC電源有一個跳閘，該電源為SCS(順序控制系統(tǒng))站的開關(guān)量I/O模板SDM的各通道提供外部電源。經(jīng)分析，該電源跳閘是引發(fā)機組跳閘的直接原因。

　　導致電源跳閘的主要原因是過載。事實上，只要有任何一個I/O通道出現(xiàn)接地，而對應的分保險不能及時燒斷的話，就可能導致總電源過載跳閘。

　　(2) SDM的開關(guān)量輸入通道要求高低電平信號，輸入的無源接點需經(jīng)過外部電源轉(zhuǎn)換成高低電平。如圖1中所示的SDM輸入通道接線原理，如果24VDC電源跳閘，各輸入通道變?yōu)榈碗娖剑?0"。

Mitsubishi Servo Amplifier MR-J2S-20B

Allen Bradley Proximity Sensor 871L-D20EN40-N4 10-60vdc 20mm Sensing

25pc Allen Bradley 1492-WFB4 Single Fuse Holder w/ Neon Blown Fuse Indicator

Pepperl & Fuchs Cylindicator Prox NJ2-D-US-2.062-?BHMS3 300VDC 250VAC

Allen Bradley 40hp Contactor 100-C60*00 w/ aux contact

Square D Cluster Pilot Light 9001KXAKM41 120V

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Allen Bradley 1305-AA03A VFD 230V 1HP

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Pepperl & Fuchs Cylindicator Prox NJ2-F-US-1.250-?BHM

Pepperl & Fuchs Cylindicator Prox NJ2-D-E2-1.250-?V1

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Simpson Digital Panel Meter F-353-13-0 9-32vdc

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Mitsubishi A Series Interrupt Module A1SI61

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Honeywell Micro Switch Limit Switch 1ML2

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11pc Swagelok VCR Fitting 6LV-4-VCR-3S-4T?B7 1.100" IN BAG

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Omron Process Controller E5EK-TPRR2-500

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SMC Slide Table MXS25-10

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Fanuc Robot Control Board A16B-1211-0860 / 04A

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VSE Flow Sensor EF01 ARO 14V-P 10L / MIN

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Macro Sensors / Schaevitz Low Voltage Conditioner LVC-2401

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American Laser Spares Laser Mirror PLCRRC0004

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Fanuc Robotics Model Module MAP001 IE-0404-040-003

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Modicon Motion Module Wiring Block 690MCB00000

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Texas Instruments Timer / Counter Access Module 5TI-3200

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Mosier Rodless Cylinder

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Sealant Equipment Metering Rod 1250-1264-.500

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Vernitron Corp Encoder WPC 1800-1 UN