基于plc雙電源開關(guān)設(shè)計(jì)外文翻譯-plc設(shè)計(jì)(已改無錯(cuò)字)
2023-07-06 13:09:54 本頁面
【正文】 d logic. In automatic switching control process, PLC ladder diagram procedure of auxiliary relay R1 and R2 respectively controlled AC contactor KM1 ( Y0 ) and KM2 ( Y1 ) coil and electric state, directly reflects two threephase power supply U1 and U2 respectively the total phase condition, namely, either U1 or U2 threephase power supply phase, KM1 ( Y0 ) or KM2 ( Y1 ) will immediately loses electricity, the normally closed contact of the alternating current contactor closed KM3 ( Y2 ) control coil gets electricity to attract, through the KM3 main contacts closed conduction contact loop, will be connected to the fault circuit load W1 or W2 automatically switches to a normal power supply U2 or U1 to power supply, so as to realize openphase protection automatic switching. In automatic switching control process, auxiliary relay R1 and R2 main function is: when troubleshooting, threephase power U1 or U2 recover the normal power supply, R1 (or R2) have electricity, the normally closed contact action, R3 reset, cut KM3 (Y2), then KM1 (Y0) or KM1 (Y1) plex have electricity, thereby automatically reverse switching back to the power supply to load W1 U1, U2 W2 power supply to load the normal power supply state. The control circuit adopts electric whistle (or buzzer) as an alarm sound (at) the same time with the red signal (at the same time with the red signal lamp), and returned to normal when the bell HA as prompt sound. Can produce two distinct alarms and prompt sound effects. 濱州學(xué)院專 科畢業(yè)設(shè)計(jì) (外文翻譯 ) 5 智能雙電源 1 智能雙電源切換的技術(shù)方案 本文所述的雙負(fù)載 — 雙電源自動(dòng)切換的 PLC控制 ,用 PLC控制程序取代繼電器邏輯控制電路 ,其具有對(duì)三相供電電源的缺相檢測(cè)及保護(hù)切換功能 ,在電源恢復(fù)正常后能自動(dòng)進(jìn)行反切換 ,當(dāng)發(fā)生故障和恢復(fù)正常時(shí)能分別發(fā)出兩種區(qū)別明顯的報(bào)警和提示音響。 雙負(fù)載 — 雙電源自動(dòng)切換的 PLC 控制 ,其缺相保護(hù)主要采取的技術(shù)方案是 :設(shè)置有三相缺相檢測(cè)信號(hào)回路 ,該三相缺相檢測(cè)信號(hào)回路直接取自于三相電源的主回路 ,即用中間繼電器 KA1KA3 和 KA4KA6,分別接于電源主回路 U1和 U2 的 A 相、 B相和 C 相單相回路中 ,KA1KA3 和 KA4KA6 的常開觸點(diǎn)分別作為 PLC 的輸入信號(hào) ,即作為編制 PLC 的 U1和 U2三相缺相檢測(cè)邏輯控制程序時(shí)的輸入條件。具有缺相保護(hù)的雙負(fù)載 — 雙電源自動(dòng)切換控制 ,不僅具有缺相保護(hù) ,同時(shí)還具有短路和過載保護(hù)、 失壓保護(hù)等功能 。能自動(dòng)進(jìn)行缺相檢測(cè)、 三相電流顯示 ,某一路供電電源發(fā)生故障時(shí)能自動(dòng)切換到另一路電源繼續(xù)對(duì)負(fù)載供電 ,并發(fā)出聲光報(bào)警 。在電源恢復(fù)正常后能自動(dòng)進(jìn)行反切換 。在發(fā)生故障和恢復(fù)
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