求翻译：设定上下限频率主要是防止现场人员误操作，避免造成电机因运转频率过低可能产生的发热或因频率过高造成机械磨损等现象。是什么意思？

Set upper and lower frequency to prevent field personnel misuse, to avoid the heat of the motor that may arise due to the operation frequency is too low or caused by mechanical wear phenomena such as the frequency is too high.

Set the upper frequency limit is to prevent accidental operation on-site personnel and to avoid the motor run frequency too low may result in excessive heat or in frequency caused by phenomena such as mechanical wear.

The hypothesis bound frequency mainly is prevented because because the scene personnel misoperation, avoids creating the electrical machinery the revolution frequency excessively to be low possibly produces gives off heat or the frequency excessively is high creates phenomena and so on machinery att

Frequency is mainly to prevent set upper and lower limits on field mistakes to avoid motor operating frequency is too low can produce phenomena such as heat or mechanical wear caused by high frequency.

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