Glossary entry (derived from question below)
English term or phrase:
be protected from overload by (with the use of)
Chinese translation:
变频器的控制功能对通风机发动机过载起保护作用。
English term
Poland
EU Interpreter in Chinese, PL, FR, EN
Native in: Polish
Works in: French to Polish, Polish to French, Chinese to Polish, and 5 more.
be protected from overload by (with the use of)
通风电机以频率转换器的控制功能为其过载防护。
the ventilator engine is protected from overload by (with the use of) frequency inverter control functions.
| 5 +1 | 变频器的控制功能对通风机发动机过载起保护作用。 |
Mark Xiang
|
| 5 +1 | 通风机用变频器的控制功能做过载保护 |
Danbing HE
|
| 5 +1 | FYI |
clearwater
|
| 4 +1 | 以...来防护过载 |
Wenjer Leuschel (X)
|
| 4 | 频率转换器的控制功能对通风电机过载起到防护的作用。 |
Chinoise
|
PRO (3): Mark Xiang, Wenjer Leuschel (X), Danbing HE
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Proposed translations
20 YRS AS MECHANICAL/TECHNICAL ENGINEER!
Native in: Chinese 
Works in: English to Chinese, Chinese to English
变频器的控制功能对通风机发动机过载起保护作用。
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Note added at 11 hrs 9 mins (2004-07-17 01:58:16 GMT)
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frequency inverter->变频器, 专业术语.
Engine is not the same as Motor.
频率转换器的控制功能对通风电机过载起到防护的作用。
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Note added at 2004-07-16 14:56:09 (GMT)
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（此处可以用转态译法，即把原文中的被动语态转换成译文中的主动语态。）
--参见<<实用翻译教程>> 上海外语教育出版社
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Note added at 2004-07-16 14:59:14 (GMT)
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（在我看来，你的译文也相当不错。）
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Note added at 2004-07-16 15:02:45 (GMT)
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be protected from overload by (with the use of) 原意确为“（通过......的作用）防护过载
以...来防护过载
Or,通风电机以变频器控制功能来防护过载。
It is just a matter of writing style.
My opinion is to make it simple, colloquial and easy to understand.
FYI
试译：
(借助使用)频率变换器的控制功能保护通风电机避免过载。
Discussion
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my problem here and in all those technical texts is the passive voice:
is protected, is done through, is operated.