基于plc双电源开关设计外文翻译-plc设计(编辑修改稿)

基于plc双电源开关设计外文翻译-plc设计(编辑修改稿)内容摘要：

4 ~ KA6 normally open contact as U1 and U2 threephase openphase detection switch sampling signal, to the PLC input terminal. Considering the PLC relay output point load capacity, through the contactor KM01 ~ KM03 to drive high current contactor KM1 ~ KM3. For threephase power U1 A, B phase and C phase lack detection, the use of an intermediate relay KA1, KA2 and KA3, respectively connected to power the U1 main circuit A, B phase and C phase and zero line N constitute a singlephase circuit, the formation of A1, B1 and C1 phase detection circuit. The normally open contact of KA1 ~ KA3 as U1 threephase. Phase lack detection switch sampling signal, to the PLC input terminal, used in the preparation of PLC U1 threephase openphase detection logic control program input conditions。 similarly, the threephase power supply U2 A, B phase and C phase lack detection, but also the use of an intermediate relay KA4, KA5 and KA6, respectively connected to power the U2 main circuit A2, B2 phase and C2 phase and zero line N constitute a singlephase circuit, the formation of A2, B2 and C2 threephase openphase detection circuit. KA4 ~ KA6 normally open contacts respectively as U2 threephase openphase detection switch sampling signal, to the PLC input terminal, used in the 滨州学院专科毕业设计 (外文翻译 ) 4 preparation of PLC U2 threephase openphase detection logic control program input conditions. 3 With PLC intelligent dual power control The threephase openphase detection signal sampling circuit, as U1 and U2 threephase openphase detection switch sampling signals of KA1KA3 and KA4KA6, the normally open contacts respectively for the input of the PLC X0X2, X3X5. In the PLC ladder diagram program, auxiliary relay R1 as the threephase power supply of U1 threephase openphase detection, which is normally open input conditions for X0, X1 and X2 and logic。 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 an。