摘要：空冷器風機在DCS系統中的狀態只有正常運行顯示，沒有停機或者故障顯示，變頻器保護停機后的再啟動的時間間隔將會引起系統操作參數波動，影響產品質量和正常生產。針對這種情況將變頻參數優化與控制線路改進，使空冷器風機變頻器保護停運時，DCS系統能顯示空冷器風機停運并發出報警信號，重新啟動時間由原來3 min減少到5 S以內，大大縮短了空冷器風機啟動時間，解決了空冷器風機停運對裝置造成的影響，確保了生產的連續平穩運行。 關鍵詞：風機；變頻器；控制系統；改造 [b][align=center]Modifications to Frequency Transformer Control System of the Fan of Air Cooler in DCS System ZHANG Xue—feng，BIAN Lian—fang，LIU Feng，CHEN Feng （Natural Gas Processing Plant of Zhongyuan Oil&Gas High Technology Stock Co．，Ltd．，Henan Puyang 457162，China）[/align][/b] Abstract：In DCS system，although the state of air eooler on normal operation is well informed，no message is available when the fan of air cooler is in shutdown and/or breakdown and the longer restart time is one of main reasens for the unsteadiness of operational parameters and product quality．To solve this problem，we had opti—mized frequency transformer param eters and improved the control circuits，added the alarm message to DCS sys—tem once the air cooler fan is in breakdown ．At the same time，we improved the restart time from 3 minutes to 5 seconds．Based on these eflbrts，the negative influence of shutdown and/or breakdown on the production system is avoided thorouhgly． Key words：fan ；frequency transform er；control system；modification 1 改造前系統狀態 （1）正常啟動過程：按下啟動按鈕SB2后由L11→FU→KA→SB1→SB2→→KM→KH→N構成回路，KM和KA1得電吸合，松開SB2后由于KM的觸點的自鎖作用，KM和KA1保持吸合。變頻器TD2000得電，FWD為變頻器運行控制輸人端，KA1閉合使變頻器進入運行狀態，空冷器風機得電運轉。此時KM的常開觸點閉合，DCS系統顯示空冷器風機運行。 [b][align=center]詳細內容請點擊： 空冷器風機變頻器的DCS狀態顯示控制系統改造[/align][/b]