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故障现象一 打开UPS的电源开关,面板指示灯不亮,蜂鸣器也无叫声,UPS无输出。 故障分析与排除 该机为后备式方波输出的小型不间断电源。机器完好时,只要打开电源开关,在市电正常情况下,由机内控制电路控制一组继电器,稳压输出正弦波220V电压;在市电不正常或无市电情况下,则由UPS内的逆变器电路将蓄电池储存的能量转变为220V的方波输出。 首先检查3A交流输入保险丝和30A的直流保险丝,两者都未损坏。接着测量两节蓄电池电压,测得电压仅为14V,离最低限度的18V相差太多。因此取下蓄电池充电,充足后将蓄电池重新装好。开机,该UPS逆变成功。用万用表测量它的输出为220V,但在市电正常情况下却无输出电压。此刻故障表现为面板上绿色灯常亮,红色灯不亮,蜂鸣器无声响。因为该机的逆变输出正常,所以进一步检查逆变与市电转换的
Symptom A power switch to open the UPS, the panel light is not lit, the beeper no barking, UPS no output. Failure Analysis and Troubleshooting This machine is a backup square wave output of a small uninterruptible power supply. When the machine is intact, as long as the power switch is turned on, under the normal condition of the mains, a set of relays are controlled by the internal control circuit to regulate the output voltage of sine wave 220V; when the mains is abnormal or without mains, The inverter circuit converts the energy stored in the battery into a square-wave output of 220V. First check 3A AC input fuses and 30A DC fuses, both without damage. Then measure two batteries voltage, the measured voltage is only 14V, 18V from the minimum difference is too much. So remove the battery charge, enough after the battery reload. Boot, the UPS inverter is successful. Use a multimeter to measure its output as 220V, but under normal conditions, there is no output voltage. At the moment, the fault manifests as the green light on the panel is always on, the red light is off, and the buzzer is silent. Because the machine’s inverter output is normal, so further check the inverter and mains conversion