6es5581-6la11存儲模塊_漳州鼎晟達自動化設備有限公司

6es5581-6la11存儲模塊

改造方案裝機容量簡介：主機為上海合眾一開利公司的19L型冷凍機組，制冷量1055kw，電機功率為210kw，冷卻水係統由三臺55kw電機各帶一臺水泵並聯組成，冷凍水係統由兩臺45kw電機各帶一臺水泵並聯組成。以冷卻水係統為例來說明改造係統的工作原理，冷卻水係統由三臺水泵並聯組成冷卻水循環係統，我們用一臺歐姆龍CPMIA30CORA型PLC控制器和一臺55kw三肯MS55型交流變頻器就可使其中一臺水泵電機處於可調狀態，這種設計在大程度上節約了投入，達到用少的投資取得大的回報。運行方式有手動、半自動、全自動三種，其主線路圖、控制線路圖、微機接線圖。

　　三臺水泵可通過選擇開關任選一臺作為起動泵，一臺作為補充泵，一臺作為備用泵，現以一號泵為變頻泵，二號泵為補充泵，三號泵為備用泵為例說明運行情況，當熱負荷較小，只需一臺電機工作在低於工頻狀態就能滿足要求時，變頻運行一號泵，且運行頻率可根據實際負荷的大小任意設定，當熱負荷增大，通過出水溫度傳感器給PLC一個信號，則一號泵自動平穩投入工頻運行，然後變頻起動二號泵，如果變頻器頻率降到低於基本頻率，則自動停止工頻運行的一號泵而繼續運行二號泵，而當熱負荷增大時，則二號泵自動平穩投入工頻運行，然後變頻起動一號泵，如果變頻器頻率又降到低於基本頻率，則自動停止工頻運行的二號泵而繼續變頻運行一號泵，如此循環下去。三號泵為備用泵，不參與運行。冷凍水係統兩臺泵的運行原理跟上面相同，只是取消了備用泵。結果分析經過改造，兩套係統大部分時間運行在42Hz，原係統所有的技術指標保持不變，改造前與改造後電機的電流。

空調係統存在的不足因為中央空調係統在選型時，是考慮按照大換熱量（即環境氣溫高，且所有場所的空調都開足）的情況下，再取的係數來確定的，而通常情況下，由於季節和晝夜氣溫的變化以及開機數目的不同，實際換熱量遠小於設計值。因此，電機容量遠大於實際負荷，出現了大馬拉小車的現象，而以往當熱負荷小時，相應的調節冷卻水、冷凍水係統的節流閥，改變管道的截面積S的方式來調節流量Q，節流閥的存在會對水流產生阻力，從而產生節流損耗，並且會引起機械振動和產生噪音。另一方面，冷凍水的流量與冷凍水泵的轉速成正比，當冷凍水泵轉速高時，冷凍水的流量大，流速也快。因此，當冷凍水流過風機盤管組件時，還沒有充分的時間將所攜帶冷量全部釋放完，就又返回制冷機去了，這樣冷凍水泵電機又做了一部分無用功。

　　採用交流變頻調速和PLC技術改造的優點採用交流變頻調速來改變冷凍水、冷卻水係統電機的轉速，從而改變水的流速，也即改變冷卻水、冷凍水的流量，由於電機可在很寬的範圍內平滑調速。可將所有節流閥開至大，使管道暢通，就可免去節流損耗，了電流衝擊和機械衝擊，並且頻率下調後，電機和機械避免了長期在高速區運行，能有效的延長電機和機組的壽命，且冷凍水泵電機採用變頻調速來調節轉速，根據實際熱負荷的大小來調節冷凍水的流量和流速，以便讓冷凍水在風機盤管組件中有充分的時間釋放在熱負荷大小相當的冷量，冷凍水泵電機的功耗就可大大降低。要實現多臺水泵電機轉速連續可調，才能使水泵電機根據實際熱負荷的大小設定其轉速，進而節約能源，優的辦法就是利用PLC控制器對變頻器進行切換控制，減少了與傳統控制器相比的大量中間繼電器，提高了係統運行的可靠性。

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