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  • 型號(hào) 140DAI54000
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  • 廠商性質(zhì) 經(jīng)銷商
  • 所在地 廈門市

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140DAI54000

 

140DAI54000

 

 

(l)接地要求和方法:
上面介紹了六種接地:供電系統(tǒng)地、保護(hù)地、邏輯地、屏蔽地安全柵地、信號(hào)回路地。對(duì)這六種接地,各家有各家的要求,雖然大都強(qiáng)調(diào)一點(diǎn)接地,接地電阻必須小于1歐姆等,但具體內(nèi)容上差別很大,下面給出幾個(gè)例子介紹常遇到的接地要求和方法。
①供電系統(tǒng)地:在很多企業(yè),特別是電廠、冶煉廠等,其廠區(qū)內(nèi)有一個(gè)很大的地線網(wǎng),而通常供電系統(tǒng)的地是與地線網(wǎng)連在一起的。有的廠家強(qiáng)調(diào)計(jì)算機(jī)系統(tǒng)的所有接地必須和供電系統(tǒng)地以及其它(如避雷地)嚴(yán)格分開,而且之間至少應(yīng)保持15m以上的距離。為了*防止供電系統(tǒng)地的影響,建議供電線線路用隔離變壓器隔開。這對(duì)那些電力負(fù)荷很重,而且負(fù)荷經(jīng)常啟停的單位是應(yīng)注意的。從抑制干擾的角度來(lái)看,將電力系統(tǒng)地和計(jì)算機(jī)系統(tǒng)的所有地分開是很有好處的,因?yàn)橐话汶娏ο到y(tǒng)的地線是不太干凈的。

 

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Brand  MITSUBISHI MELSEC (PART# AJ71QE71N-B5T)


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Metrawatt power supply unit GTZ 4108


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 MITSUBISHI PC Board & SOFTWARE (A70BDE-J71QLR23)


Brand  MITSUBISHI SERVO MOTOR HC-103BT


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MITSUBISHI KEYBOARD SWITCH(Part # KS-4MB915ABKO-NC4157)


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RIVERSTONE Circuit Board 24-port Card ( X15-GE-24DCSF-A


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Brand  SANYO LNS-W10 Projector Short Zoom Lens for P


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