3A99859G02值得擁有

3A99859G02值得擁有

dcs系統(tǒng)接地的基本要求 
　　dcs系統(tǒng)接地是為了保證當(dāng)進(jìn)入dcs系統(tǒng)的信號(hào)、供電電源或dcs系統(tǒng)設(shè)備本身出現(xiàn)問題時(shí)，可靠的接地系統(tǒng)能承受過載電流并可以迅速將過載電流導(dǎo)入大地。接地系統(tǒng)能夠?yàn)閐cs提供屏蔽層，消除電子噪聲干擾，并為整個(gè)控制系統(tǒng)提供公共信號(hào)參考點(diǎn)(即參考零電位)。當(dāng)接地系統(tǒng)發(fā)生問題時(shí)(接地電阻過大，多點(diǎn)接地控制工程網(wǎng)版權(quán)所有，接地線斷線或接地線與高電壓、大電流設(shè)備相接觸等)，會(huì)造成人員的觸電傷害及設(shè)備的損壞，還會(huì)造成dcs系統(tǒng)經(jīng)常“死機(jī)"(或不明原因的“死機(jī)")，大多是因?yàn)榻拥叵到y(tǒng)不良或存在問題所引起的。 
　　因此，完善、可靠、正確的接地，是dcs 系統(tǒng)能夠安全、可靠和良好運(yùn)行的關(guān)鍵。
d cs系統(tǒng)的接地方法 
　　4.1 分散布置的dcs設(shè)備接地方法 
　　分散布置dcs系統(tǒng)設(shè)備之間的連接一般是網(wǎng)絡(luò)(通訊)線，例如：現(xiàn)場控制站分散到現(xiàn)場，而操作員站位于不同的控制室，分散直徑在500米的范圍內(nèi)，各站點(diǎn)間使用多模光纖或5類雙絞線或dp屏蔽雙絞線等連接。 
　　(1) 使用光纖連接的站點(diǎn)：各站點(diǎn)內(nèi)的接地方法同集中布置的dcs設(shè)備。 
　　(2) 使用5類雙絞線或dp屏蔽雙絞線連接的站點(diǎn)： 
　　(3) 控制室的各類地線先連接到公共連接板，公共連接板通過接地總干線與公共接地極相連。從公共接地極看過去，整個(gè)接地網(wǎng)絡(luò)是一個(gè)星型結(jié)構(gòu)。

LOGOSOL LS-773  LOGOSOL, NETWORK I/O NODE LS-773

NATIONAL SEMICONDUCTOR LF355AH  NATIONAL SEMICONDUCTOR I.C.

LED-GPOA70-228TR MANUFACTURING INTEGRATION TECHNOLOGY LED-GPOA70-228TR    LIGHTI

BECKHOFF KL9186  Potential distribution terminals

NIKON KBB04410 A03-1    ARM SHORT, SIDE SLIDE

JF325914  KF-KF-TUBE T ADAPTER; flange: 50.45mm(O.D.)/ 21.87mm (I.D.); 2nd flang

IMP16SU MEACON CORP IMP16SU    UNION, 1X1 TUBE TEFLON

MECHANICAL PLASTICS GJWB60  MECHANICAL PLASTICS CORP THE TB TOGGLER BUMPER KNOB

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TOKYO ELECTRON () ES027-002507-1      O-RING, FLUORINE ID3.359 CSD. 150 BLACK

KEYENCE EM-080  SENSOR, PROXIMITY

VARIAN E41000072      BELT, IMPLANT SUB-SYSTEM

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ASYST Technologies 9700-4228-01    Adapter Plate 150mm

Allmro Products Inc. 933953  3(.5) X 6 SS SHCS VENT/CLEAN PKG 33

GREENE TWEED 9120-SD653  O-RING, CHEMRAZ

SPM INC 90122-1  PERF PLATE AMAT MRA 8 INCH

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EOS Technology  WS167  SPACE GROUND ELECTRODE

METRON TECHNOLOGY U3ATRM2018/UBATRM200  HAND/SHEET

CELERITY GROUP INC TR0001346803  TRANSDUCER, PRESSURE

RECIF TECHNOLOGIES S.A.S IDLW DISPLAY      BOARD, CARRIER ROTATION MANAGEMENT

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RIGAKU SPS-8T-4H  PRESSURE SWITCH

PATLITE SL-V  Signal Tower, 24v AC/DC Bulb 0.11A

LANDIS & GYR SEZ 61.1  POLYGYR SWITCH ON-OFF SEZ 61.1 L&G, 24POLYGYR~+20%, 50...

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TOKYO ELECTRON () 071-001701-1    CHEMICAL..ORGARD C-601 250CC/*

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APPLIED MATERIALS (AMAT) 0226-96765    ASSY REFILLABLE LEVEL SENSE/TEMPERATURE

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10663-001    Z-AXIS BELT BRUSHLESS

LINDE AG 106494  SEALING ELEMENT FOR PIC2610

SVG THERMCO 101873-01      VTR- RING,CEILING BLKHD,8"

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