基于plc雙電源開關設計外文翻譯-plc設計-免費閱讀
【正文】 在自動切換的控制過程中 ,PLC 梯形圖程序中的輔助繼電器 R1 和 R2 分別控制交流接觸器 KM1(Y0)和 KM2(Y1)線圈的得失電狀態(tài) ,分別直接反映出兩路三相電源 U1 和U2 各自總的缺相狀況 ,即任一路三相電源 U1 或 U2 發(fā)生缺相時 ,KM1(Y0)或 KM2(Y1)會立即失電 ,其常閉觸點閉合使交流接觸器 KM3(Y2)控制線圈得電吸合 ,通過 KM3 的主觸點閉合導通聯(lián)絡回路 ,將接于故障回路的負載 W1或 W2自動切 換到另一正常電源U2 或 U1 繼續(xù)供電 ,從而實現(xiàn)缺相保護的自動切換。 考慮到 PLC 繼電器輸出點的負載能力 ,通過接觸器 KM01～ KM03 來驅動大電流接觸器 KM1～ KM3。 其中包括主回路和三相缺相檢測采樣信號回路。 雙負載 — 雙電源自動切換的 PLC 控制 ,其缺相保護主要采取的技術方案是 :設置有三相缺相檢測信號回路 ,該三相缺相檢測信號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 的常開觸點分別作為 PLC 的輸入信號 ,即作為編制 PLC 的 U1和 U2三相缺相檢測邏輯控制程序時的輸入條件。 automatic phase lack detection, threephase current display, a road power supply circuit can automatically switch to another power source to load power supply, light and sound alarm。 two phase power supply main loop in each phase are current meter to indicate the phase current status, with the control circuit of phase lack detection. The threephase openphase detection signal sampling circuit, the phase detection signal directly from the main circuit of threephase power supply, namely the intermediate relay KA1 ~ KA3KA4 ~ KA6 are respectively connected to the power supply main loop U1 and U2 A, B phase and C phase of the singlephase circuit, KA1 ~ KA3 and KA4 ~ 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。 它克服了現(xiàn)有中低檔雙電源切
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