1. When the mains power is available, the UPS will alarm when the mains power is cut off. Possible fault causes: 1) The mains input air switch trips. 2) The input AC line is in poor contact. 3) The mains input voltage is too high, too low or the frequency is abnormal. 4) The UPS input air switc

1、 The inverter power supply is converted from DC (direct current) to AC (alternating current). The UPS power supply has three modes: bypass mode, mains mode and battery mode. 2、 Generally speaking, the inverter is just a complete changer without any impurities of filtered electricity. The device