SEC-4400M

以下應用場合，必須考慮加大變頻器的容量，(至少放大一檔或兩檔)：
<1>、多級電機，同等功率，電機級數為6級或8級電機，變頻器額定電流小于電動機額定電流;
<2>、電動機允許過載時間大于2分鐘(例：潛水泵、深井泵);
<3>、低頻重載啟動，加減速時間有特殊要求：a、快速啟停;b、頻繁點動。(例：擠壓成型機、水泥回轉窯、球磨機)注：

增加電動機的級對數或增大減速機的減速比對于低頻重載起動的負載尤其適用。
<4>、沖擊負載(離合器連接負載);
<5>、不均衡負載(例：攪拌機、粉碎機、軋鋼機);
<6>、大慣性負載(例：沖床、離心機、水泥旋轉窯、陶瓷回轉磨);
<7>、四象限運行負載(例：升降機、起重機、抓斗機);
<8>、脈動轉矩負載(例：空壓機、深井泵/潛水泵、振動機、泥沙泵、油壓泵、音樂噴泉);
<9>、高速運轉負載(例：木工機械、機床、紡織機械、印刷機械);
<10>、同步電動機或繞線式異步電動機。注：對于連續、斷續以及短時負載，變頻器選型應按大電流原則選擇為基準。

(例：數控車床、龍門刨床等)

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