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A20B-2901-0500現(xiàn)貨 in stock! 歡迎來電咨詢~！！

A20B-2901-0500,

A20B-2901-0500

一般工業(yè)控制系統(tǒng)既包括弱電控制部分，又包括強(qiáng)電控制部分。為了使兩者之間既保持控制信號，又要隔絕電氣方面的，即實行弱電和強(qiáng)電隔離，是保證系統(tǒng)工作穩(wěn)定，設(shè)備與操作人員安全的重要措施。

　　電氣隔離目的之一是從電路上把干擾源和易干擾的部分隔離開來，從而達(dá)到隔離現(xiàn)場干擾的目的。

　　一、信號隔離

　　信號的隔離目的之一是把引進(jìn)的干擾通道切斷，使測控裝置與現(xiàn)場僅保持信號，不直接發(fā)生電的。工控裝置與現(xiàn)場信號之間常用的隔離方式有光電隔離、脈沖變壓器隔離、繼電器隔離和布線隔離等。

　　1.光電隔離

　　光電隔離是由光電耦合器件來完成的。其輸入端配置發(fā)光源，輸出端配置受光器，因而輸入和輸出在電氣上是完全隔離的。由于光電耦合器的輸入阻抗(100Ω～1kΩ)與一般干擾源的阻抗(105～106Ω)相比較小，因此分壓在光電耦合器的輸入端的干擾電壓較小，它所能提供的電流并不大，不易使半導(dǎo)體二極管發(fā)光。另外光電耦合器的隔離電阻很大(約1012Ω)、隔離電容很小(約幾個pF)，所以能阻止電路性耦合產(chǎn)生的電磁干擾，被控設(shè)備的各種干擾很難反饋到輸入系統(tǒng)。

　　光電耦合器把輸入信號與內(nèi)部電路隔離開來，或者是把內(nèi)部輸出信號與外部電路隔離開來，如圖1所示。開關(guān)量輸入電路接入光電耦合器后，由于光電耦合器的隔離作用，使夾雜在輸入開關(guān)量中的各種干擾脈沖都被擋在輸入回路的一側(cè)。由于光電耦合器不是將輸入側(cè)和輸出側(cè)的電信號進(jìn)行直接耦合，而是以光為媒介進(jìn)行耦合，具有較高的電氣隔離和抗干擾能力。

　　目前，大多數(shù)光電耦合器件的隔離電壓都在2.5kV以上，有些器件達(dá)到了8kV，既有高壓大電流大功率光電耦合器件，又有高速高頻光電耦合器件(頻率高達(dá)10MHz)。常用的器件如4N25，其隔離電壓為5.3kV；6N137，其隔離電壓為3kV，頻率在10MHz以上。

　　2.脈沖變壓器隔離

　　脈沖變壓器的匝數(shù)較少，而且一次繞組和二次繞組分別繞于鐵氧體磁芯的兩側(cè)，這種工藝使得它的分布電容特小，僅為幾個pF，所以可作為脈沖信號的隔離元件。脈沖變壓器傳遞輸入、輸出脈沖信號時，不傳遞直流分量，PLC使用的數(shù)字量信號輸入/輸出的控制設(shè)備不要求傳遞直流分量，因而在工控系統(tǒng)中得到了廣泛的應(yīng)用。

　　圖2是脈沖變壓器的應(yīng)用實例。電路的外部信號經(jīng)RC濾波電路和雙向穩(wěn)壓管抑制常模噪聲干擾，然后輸入脈沖

　　變壓器的一次側(cè)。為了防止過高的對稱信號擊穿電路元件，脈沖變壓器的二次側(cè)輸出電壓被穩(wěn)壓管限幅后進(jìn)入測控系統(tǒng)內(nèi)部。一般地說，脈沖變壓器的信號傳遞頻率在1kHz～1MHz之間，新型的高頻脈沖變壓器的傳遞頻率可達(dá)到10MHz。

　　3.繼電器隔離

　　繼電器的線圈和觸點沒有電氣上的，因此，可利用繼電器的線圈接受信號，利用觸點發(fā)送和輸出控制信號，從而避免強(qiáng)電和弱電信號之間的直接接觸，實現(xiàn)了抗干擾隔離。

　　圖3是繼電器輸出隔離的實例示意圖。在該電路中，通過繼電器把低壓直流與高壓交流隔離開來，使高壓交流側(cè)的干擾無法進(jìn)入低壓直流側(cè)。

　　4.布線隔離

　　將微弱信號電路與易產(chǎn)生噪聲污染的電路分開布線，zui基本的要求是信號線路必須和強(qiáng)電控制線路、電源線路分開走線，而且相互間要保持一定的距離。配線時應(yīng)區(qū)別分開交流線、直流穩(wěn)壓電源線、數(shù)字信號線、模擬信號線、感性負(fù)載驅(qū)動線等。配線間隔越大，配線越短，則噪聲影響越小。但是，實際設(shè)備的內(nèi)外空間是有限的，配線間隔不可能太大，只要能維持zui低限度的間隔距離便可。

　　附表列出了信號線和動力線之間應(yīng)保持的zui小間距。如果受環(huán)境條件的限制，信號線不能與高壓線和動力線等離得足夠遠(yuǎn)時，就得采用諸如信號線路接電容器等各種抑制電磁感應(yīng)噪聲的措施。

上億庫存，國內(nèi)外近千個倉庫，公司部分產(chǎn)品型號如下，歡迎聯(lián)系哦~！

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IC693CPU363RR CPU363 Module (240K Bytes configurable user memory)

IC756ADV000J-98 DV Development - AIX Op Sys, Japanese, Version 9.8

MSI-EFF-5 Efficiency Management Clients 5 Pack

SLC/1746 System 1746-RT25C REPLACEMENT TERMINAL BLOCK (ORANGE)

Distributed I/O 1738-IB2M12 24VDC 2 SINKING INPUTS WITH M12 CONNECTORS

Application-specific products 9307-RSPRTD RSPOWER RT FOR AB PM1 PM2 POWER MONITORING DEVICES

Operator Interface 2711-NF7 FUNCTION KEY STRIP PV300 KEY

Support 9302-PCOS SUPT RENEWAL CONTRACT FOR 9302PCO

Support 9510-PPKENS SUPT RENEWAL CONTRACT FOR 9510PPKEN

DeviceNet Products 1787-TCABL T-STYLE CABLE FOR 1770-KFD 6 FT (1.82 METERS)

RSI Software Products 9301-2SE3350ZHU3 RSVIEW32 RUNTIME 1500-5K UPGRADE IN-SUPT (ZH)

RSI Software Products 9326-AD10WDENE WIRING DIAGRAM GENERATOR ADD-ON 10 USER

Motion Control MPG-A004-091M24 MOTOR,SERVO,GEAR RATIO 91,15NM,66RPM,MULTI,BRK

Silver Series 1756-M2 LOGIX5550 1MBYTE EXPANSION MEMORY

HE693IBS313 Interbus-S slave module for Series 90-30 autoconfiguring CPU313 rack.

IC655MDL524RR Input Simulator Module, 16 or 32 Points Switch Selectable