... problemsSelf test while start of the UPSSite wiring fault warningOn-battery power-on functionSmart RS232 communication interfaceIntelligent slot availableSealed lead-acid, maintenance ... bypass and vice versaLED IndicatorsStatusLoad level / Battery level, Battery , Utility Power, Inverter, Bypass, Overload, FaultAudible AlarmBypass, On battery mode, Battery low, Overload, FaultAcoustic NoiseAt 1 ...