描述
P0903ZL
光導(dǎo)纖維是利用光的完全內(nèi)反射原理傳輸光波的一種介質(zhì)，它是由高折射率的纖芯和包層所組成。包層的折射率小于纖芯的折射率，直徑大致為0.1mm～0.2mm。當(dāng)光線通過端面透入纖芯，在到達與包層的交界面時，由于光線的完全內(nèi)反射，光線反射回纖芯層。這樣經(jīng)過不斷的反射，光線就能沿著纖芯向前傳播且只有很小的衰減。光纖式傳感器就是把發(fā)射器發(fā)出的光線用光導(dǎo)纖維引導(dǎo)到檢測點，再把檢測到的光信號用光纖引導(dǎo)到接收器來實現(xiàn)檢測的。按動作方式的不同，光纖式傳感也可分為對射式、漫反射式等多種類型。光纖式傳感器可以實現(xiàn)被檢測物體在較遠區(qū)域的檢測。由于光纖損耗和光纖色散的存在,在長距離光纖傳輸系統(tǒng)中,必須在線路適當(dāng)位置設(shè)立中級放大器,以對衰減和失真的光脈沖信號進行處理及放大。電動機啟動電流對其壽命的影響，要看啟動電流大到何種程度，以及起動次數(shù)的多少而定一般來說，起動電流所造成的發(fā)熱效應(yīng)以及機械力不致?lián)p壞電動機.但起動頻繁(每小時起動50次以上)時，就能使電動機發(fā)熱過甚而縮短壽命，甚至于損壞.對大功率的異步電動機若起動電流過大，還會使電網(wǎng)電壓下降過大，影響其他用戶.?有的熱繼電器有自動復(fù)位功能，即熱繼電器動作后電機停轉(zhuǎn)，串接在主回路中的熱繼電器的熱元件冷卻，熱繼電器的觸點自動恢復(fù)原狀。如果這種熱斷電器的常閉觸點仍然接在PLC的輸出回路，電機停轉(zhuǎn)后過一段時間會因熱繼電器的觸點恢復(fù)原狀而自動重新運轉(zhuǎn)，可能會造成設(shè)備和人身事故。因此有自動復(fù)位功能的熱繼電器的常閉觸點不能接在PLC的輸出回路，必須將它的觸點接在PLC的輸入端（可接常開觸點或常閉觸點），用梯形圖來實現(xiàn)電機的過載保護。如果用電子式電機過載保護器來代替熱繼電器，也應(yīng)注意它的復(fù)位方式。
產(chǎn)品承諾：
保?證?全新原裝進口,
保?證?安全準(zhǔn)時發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢價格，大量現(xiàn)貨。
主營DCS系統(tǒng)配件
機器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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Triconex?Siemens?Yaskawa?ABB?GE?Ovation?AB?Foxboro?Motorola?Schneider?XYCOM?KUKA ? 專業(yè)銷售進口DCS? PLC系統(tǒng)備件模塊 15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家
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專業(yè)銷售進口DCS? PLC系統(tǒng)備件模塊
PLC模塊，可編程控制器，CPU模塊，IO模塊，AI模塊，通訊模塊。AB/施耐德/ABB/GE/本特利/西屋/英維斯/霍尼韋爾/黑馬/FU克斯波羅
15天包退換 一年質(zhì)保 大量現(xiàn)貨? 國內(nèi)實力庫存商家
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