AEG PROTECT A. 500 Operating Instructions Manual

24The connected loads are powered using the monitored andfiltered mains voltage, which is additionally stabilised by theintegrated A.V.R. control unit. The green “Normal” LED showsthat the unit is active.5.7.2 Battery Operation / Autonomous OperationWhen there is a mains failure or if the input voltage movesoutside the tolerance range, the inverter automaticallyswitches over to autonomous mode and supplies the loadswith voltage from the battery. This drains the capacity of thebattery and it is discharged. This status is signalled by thegreen “Battery” LED flashing as well as an intermittentacoustic signal (chapter 4.3 / no. 2 / pg. 19).If the UPS does not automatically return to normal operationafter a few minutes, close all your work as usual and switchoff the loads (e.g. PC) before the battery is fully discharged.This lengthens the service life of the battery! Switch OFF theUPS by pressing the main switch.During the discharge process as the battery capacityconsistently drops, the “Battery” LED flashes, accompaniedby an intermittent acoustic signal (once every 10 seconds).The electronics of the UPS switch off the voltage supply of theloads shortly after the battery undervoltage limit is reached(“Battery” LED flashes every second; acoustic signal soundsevery second).Never store the unit in this condition! The discharged batterysystem should be recharged within a week at the latest.When the mains voltage comes back, the UPS must beswitched on again using the main switch (only applies if it waspreviously switched off manually), in order to recharge thebattery and thus store sufficient battery capacity for anypossible future mains failures.The battery is automatically charged when the mains ispresent. The battery charging time (to 90% of rated capacity)is about 8 hours after being previously fully discharged.5.7.3 System Diagnosis / Fault TestIf the monitoring electronics detect an irregularity, the red“Fault” LED is triggered at the same time as an acoustic fault