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故障一:UPS电源不切换市电,只能在逆变状态下工作.故障分析:输入电压、输入频率正常,电池工作时输出电压也正常,但就是不能切换市电.由于机器无烧毁和烧伤痕迹,故怀疑电源主开关有问题,因主开关内有一微动开关控制市电的切换,此开关容易因频繁开启而损坏.处理方法:拆下主开关,用万用表测量所有接点间电阻,发现主开关内部控制市电切换的回路在主开关处于ON,OFF两种状态下其两端电阻均为无穷大,说明开关巳坏,拆下换上好的开关,UPS立即正常切换市电,故障排除.
Failure a: UPS power does not switch the mains, can only work in the inverter state. Failure Analysis: Input voltage, the input frequency is normal, the battery output voltage is also normal, but that is, can not switch mains. As the machine without burning and burns Traces, it is suspected that there is a problem with the main power switch, because there is a micro switch in the main switch to control the switching of mains, the switch easily damaged due to frequent open.Methods: Remove the main switch, with a multimeter to measure the resistance of all contacts found The main switch internal control circuit switching mains switch in the ON and OFF state of the two states are infinite at both ends of the resistance, the switch has been bad, remove the switch put a good, UPS normal immediately switch the mains, troubleshooting .