When display value of voltage is out of the scope of upper and lower limit protection value, alarm indication lamp of controller is lighted.
当电压、谐波测量显示值超出设定的上、下限保护值的范围时，控制器报警指示灯亮。
The voltage step-up unit steps up the output voltage of the first power supply to a lower limit of an operating voltage of the voltage step-down unit.
电压递升单元将第一电源的输出电压递升到电压递降单元的 工作电压的下限。
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