Fig. 6.1: Line mode of operation
If the UPS becomes overloaded, the percentage of the load will be shown
and the audible alarm will beep twice per second. In this case, the UPS load
has to be decreased to less than 90% of its rated power capacity.
6.2 Battery Mode of Operation
The LCD display of the UPS in the battery mode of operation is shown in the
figure below. In this mode of operation, information about the input mains
supply, the battery, the UPS output and the load are displayed. The block
"INVERTER" on the LCD display indicates that the inverter is in operation.
Note that:
1) When the UPS is in the battery mode, the alarm beeps once every
4 seconds. To silence the alarm, press the "ON" button for more
than one second. Pressing the "ON" button again for more than one
second resumes the alarm again.
2) If the mains input supply voltage becomes higher than the
maximum input voltage accepted by the UPS, the "H" sign will be
shown on the LCD, while if the mains input supply voltage becomes
lower than the minimum input voltage accepted by the UPS, the "L"
sign will be shown on the LCD.
If the input mains supply is lost, both "H" and "L" signs will
disappear and the input voltage and frequency will display zeros.
