1756-L60M03SE
1756-L60M03SE
選用帶變頻啟動功能的電機型EPS
市電供電正常時,經(jīng)交流旁路和轉換開關向電機負載供電.與此同時,市電還經(jīng)充電器向電池組充電.當市電供電中斷時,為確保EPS的安全運行,希望他執(zhí)行”延時切換”操作,以便讓電機*停止轉動后再啟動變頻器,由它對后接電機執(zhí)行從0~220Hz的頻率逐漸增高的變頻啟動的操作(啟動時間為幾秒鐘).采用變頻啟動方案帶來的好處是:
1)防止在EPS應急電源與處于”慣性運動狀態(tài)”下的電機所產(chǎn)生的自激勵電源處于互相”非同步入鎖”狀態(tài)而產(chǎn)生的鼓掌隱患;
2)可降低EPS應急電源的輸出功率和降低投資成本.此時,EPS的輸出功率只需選取1.2~1.4倍電機的額定功率就可滿足要求.
其缺點是:
1)要求用戶的電機負載首先停機,然后在滿速”變頻啟動”,從而造成電機負載工作的”不連續(xù)性”
2)如果后接的幾臺電機需要在不同的時刻進行”分時啟動”操作時,可能會遇到這樣的技術難題:在啟動處于靜止狀態(tài)的電機時,若EPS的輸出功率足夠大它可能承受5~10倍的電機啟動浪涌電流的沖擊.否則,就會迫使EPS應急電源重新進入新一輪的”變頻啟動”工作狀態(tài).由此帶來的問題之一是:原來處于正常工作轉速的電機,會再次轉入轉速由0~50Hz的變速啟動階段,從而給用戶的工作帶來麻煩.。
☆公司名稱:廈門泰尼電氣有限公司
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☆ (請備注:“01006”收)
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☆ :小黃《女士》
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★ 地址:廈門市海滄區(qū)海滄街道濱湖一里7號
☆公司:www.xmtaini.com
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用戶在為電機這類負載選擇EPS應急電源時,首先要確定電機的啟動方式,EPS技術人員就會根據(jù)您的設備,作出相匹配的解決方案,這樣就使得整個應急系統(tǒng)將會更加的安全可靠。