仪器可以使警报器发声，作为需要采取行动避免运行于设计极限之外的设备损害等条件的事前警报。
Instruments may sound alarms as advance warnings of conditions requiring action to avoid damage to equipment operating beyond its design limitation.
在适宜的运行条件下，参考速度可超到极限转速的值。
Under appropriate operating conditions, the reference speed may be exceeded up to the value for the limiting speed.
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