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            STBEPI2145K
            發布者:工控備件  發布時間:2019-08-23 09:40:14  訪問次數:278

            STBEPI2145K現貨 in stock! 歡迎來電咨詢~。

            STBEPI2145K


              根據本公司無負壓管網增壓設備的特點,采用西門子 S7-200 SMART、SMART LINE 和 V20 變頻器的全套解決方案。文中對設備的工藝流程進行了分析,使用一控二的方式達到了良好的控制效果,V20 變頻器通過 Modbus 與 S7-200 SMART 進行通訊,驅動無負壓管網增壓設備,保證了用戶對恒壓管網供水的要求。在軟件方面采用了 S7-200 SMART PID 控制方式,實現了對無負壓管網增壓設備的完美控制。
              關鍵詞:S7-200 SMART,SMART LINE,V20,無負壓管網增壓設備
              1. 項目簡介
              隨著我國物質文明生活水平的提高,高層建筑越來越多,自來水管網壓力出現不足,很多城市普遍存在著用水高峰期上不去水的現象。由此引發生活、辦公用水難的問題。無負壓管網增壓設備可直接與自來水管網串接而不產生負壓,能夠安全、衛生的向用戶供水。該設備充分利用了市政自來水管網的原有壓力,在原有壓力的基礎上實現壓力疊加,差多少,補多少,使二次加壓設備的選型減小,節省投資,同時在使用過程中也可節能很大一筆費用,是目前最先進最新型的二次供水方式。
              該設備采用 SIMATIC S7-200 SMART + SMART LINE + V20 變頻器。優良的工藝造就了高質量的產品,強大的技術支持保證了產品的高性能。SIMATIC S7-200 SMART 與 SMART LINE 上添加的以太網口,方便了調試程序,不用頻繁的插拔電纜,節省了下載程序的時間。V20 變頻器的宏指令調用功能,可快速實現參數設置。V20 變頻器的小體積與上進下出的接線方式,節省了所占用的空間,便捷的接線方式,強大的功能,簡潔的操作方式,體現了基本型變頻器的發展趨勢。
             設備選型為一控二。自動運行時 SIMATIC S7-200 SMART 驅動 V20 變頻器。通過變頻器拖動一臺泵升速,一臺泵運行到某個頻率能夠達到目標壓力,則單臺泵進行恒壓供水。如果單臺泵運行到 50Hz,經過延時進行切換,一臺工頻、一臺變頻運行,目標壓力為用戶設定壓力。通過觸摸屏可以查詢以及更改參數?梢圆樵兡骋粫r間段的故障以及故障時間。觸摸屏還設計了手動控制系統的啟停。
              3、 方案確定
              由于該無負壓供水設備系統屬于成熟機的升級,客戶比較傾向于性價比高的產品。SIMATIC S7-200 SMART、SMART LINE、V20 作為西門子新一代研產品具有良好的性價比。SIMATIC S7-200 SMART、SMART700IE 本身具有集成的以太網口,既方便了技術人員的調試,又方便了設備連接到工廠的網絡上。SIMATIC S7-200 SMART 還有可擴展的 RS485 接口,方便了現場通訊口使用。
              a)、設備接通電源,SIMATIC S7-200 SMART 電源信號燈亮,SMART LINE 處于待機工作模式,系統通過 SA1 分為手動與自動模式。
              b)、SA1 轉換打到自動模式:手動模式是操作人員就地控制每臺水泵的啟停。手動運行可選擇為手動變頻或者手動工頻。手動變頻運行的時,只能運行一臺水泵,需要操作人員通過電位器控制頻率的升降。
              c)、SA1 轉換打到自動模式:自動模式又分為屏手動與屏自動。屏手動是操作人員通過 SMART LINE 控制相對應的每臺泵的輸出。屏自動控制需要操作人員把相關的參數設置完全,系統會判斷當前的實際數值與操作員設置的數值進行比較,判斷管網壓力是小于設定壓力還是高于設定壓力。

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