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              PLC企業資訊
                6EP1332-1SH52
                發布者:gw0002  發布時間:2018-08-29 15:05:45

                6EP1332-1SH52

                6EP1332-1SH52

                6EP1332-1SH52

                _________________________________________ 
                〖廈門光沃自動化設備有限公司 竭誠為您服務〗   
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                在中央空調系統設計中,冷凍泵、冷卻泵的裝機容量是取系統最大負荷再增加10%—20%余量作為設計系數。根據計算中央空調系統中,冷凍水、冷卻水循環用電約占夏季酒店總用電的25%—30%,冷卻塔的用電占8%—10%。因此,實施對冷凍水和冷卻水循環系統以及冷卻塔的能量自動控制是中央空調系統節能改造及自動控制的重要組成部分。
                 2、泵的轉速調節
                根據異步電動機原理n=60f/p(1-s)式中:n:轉速 f:頻率 p:電機磁極對數 s:轉差率
                由上式可見,調節轉速有3種方法,改變頻率、改變電機磁極對數、改變轉差率。在以上調速方法中,變頻調速性能最好,調速范圍大,靜態穩定性好,運行效率高。因此改變頻率而改變轉速的方法最方便有效。
                 3、冷卻塔的控制
                以前的冷卻塔是人為的根據冷卻水溫度選擇冷卻塔開啟的臺數,非常容易造成能源的浪費現象,現在根據冷卻水的溫度,由溫度傳感器傳送信號至PLC,由PLC經計算后對冷卻塔風機依次開啟,以28℃為基數,溫度每上升2℃,開啟兩臺散熱風機,每下降2℃,延時5分鐘后停止2臺風機,以達到節能效果。

                節能改造的具體方案
                  1、主電路的控制設計
                  根據具體情況,同時考慮到成本控制,原有的電器設備盡可能的利用。冷凍水泵及冷卻水泵均采用一用一備的方式運行,使用一臺變頻器控制拖動兩臺水泵交替運行。將一臺揚程較高的冷水泵作為備用。
                以下為冷凍水泵與冷卻水泵一次接線圖:
                 2、功能控制方式
                工作流程:
                  開機:開啟冷水及冷卻水泵,由PLC控制冷水及冷卻水泵的啟停,由冷水及冷卻水泵的接觸器向制冷機發出聯鎖信號,開啟制冷機,由變頻器、溫度傳感器、溫度模塊組成的溫差閉環控制電路對水泵進行調速以控制工作流量,同時PLC控制冷卻塔根據溫度傳感器信號自動選擇開啟臺數。
                  停機:關閉制冷機,冷水及冷卻水泵以及冷卻塔延時十分鐘后自動關閉。
                  保護:由壓力傳感器控制冷水及冷卻水的缺水保護,壓力偏低時自動開啟補水泵補水。

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