基于plc雙電源開關設計外文翻譯-plc設計(文件)
【正文】 dual power automatic switching control, not only has the openphase protection, but also has a short circuit and overload protection, undervoltage protection function。 power supply U2 main circuit through the AC contactor KM2 main contacts and a load of W2 connected。 similarly, internal intermediate relay R2 as the threephase power supply of U2 threephase openphase detection, it’s on conditions for the normally open input X3, X4 and X5 and 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. 濱州學院專 科畢業(yè)設計 (外文翻譯 ) 5 智能雙電源 1 智能雙電源切換的技術方案 本文所述的雙負載 — 雙電源自動切換的 PLC控制 ,用 PLC控制程序取代繼電器邏輯控制電路 ,其具
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