4 Chapter 1 Product Introduction
Liebert ITA 16kVA/20kVA User Manual
1.5.3 Battery Mode
Upon mains failure, rectifier overload or mains voltage exceeds the specifications, the rectifier and internal charger
will become inoperative, and the battery will supply power to the load through the inverter. The inverter indicators are
on and the buzzer alarms, which notifies you that the UPS is in Battery mode.
Note
1. The battery has been fully charged before delivery. However, transportation and storage will inevitably cause some charge loss.
Therefore, it is required to charge the battery for eight hours before putting the UPS into operation, so as to ensure the adequate
stand time for battery.
2. Battery cold start can also be used to start the UPS from the Battery mode (charged) upon mains failure. Therefore, the battery
power supply can be used independently for improving the system availability to some extent.
1.5.4 ECO Mode (For Single System Only)
In ECO mode, the load is powered by bypass when the bypass voltage is normal, and the load is powered by inverter
when the bypass voltage is abnormal. ECO mode is an energy-saving operation mode. For some power equipment
that insensitive to power grid quality, you can use the ECO mode for power supply through bypass to reduce the
power loss.
Note
1. In ECO mode, if the bypass failure or bypass voltage is abnormal when the output is not overload, the UPS will switch to Normal
mode. However, if the bypass failure or bypass voltage is abnormal when the output is overload, the UPS will not switch to Normal
mode, but shut down the bypass.
2. In ECO mode, the efficiency of the UPS is up to 98%.
1.5.5 Fault State
In Normal mode, the UPS will switch to Bypass mode when the inverter failure or the UPS over-temperature. In
Battery mode, the UPS will shut down and stop the output when the inverter failure or the UPS over-temperature. In
Fault state, the fault indicators will turn on, the buzzer will keep beeping, and the corresponding fault information will
be displayed on LCD panel.
Note
In Fault state, if the bypass failure or bypass voltage is abnormal when the output is not overload, the UPS will shut down and be
switched to the inverter for power supply, such as radiator over-hot. However, if the bypass failure or bypass voltage is abnormal
when the output is overload, the UPS will not switch to the inverter for power supply, but shut down the bypass.
