低于额定频率 underfrequency
低于额定功率范围 subpower range
低于额定频率百分数卡 underfrequency pc card
保额低于规定 Under insured
当电动机启动时，其电压不允许低于额定值的85%。
When the motor is started, its voltage is not permitted to go below 85 percent of the rated value.
下超调下超调指电压调整器或控制器在应对负荷变化时，电压或频率低于额定的量。
Undershoot Undershoot refers to the amount by which voltage or frequency drops below the nominal value as the voltage regulator or governor responds to changes in load.
检查电源电压是否与额定电压相符，不能在超过或低于额定电压10%的电源上使用。
Whether or not check the supply voltage and rated voltage line can not be above or below 10% of rated voltage on the use of power.
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