Chapter 1 Product Introduction 5
Liebert
®
ITA 16kVA And 20kVA UPS User Manual
Note
In case of mains failure or mains voltage out of range in Bypass mode, the UPS will shut down and stop the output.
1.5.3 Battery Mode
Upon mains failure or voltage out of range, the rectifier and internal charger will stop running, and the battery will
supply power to the load through the inverter. The inverter indicators are on together with buzzer alarming, 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 capacity
loss. Therefore, it is required to charge the battery for eight hours before putting the UPS into operation for the first time, to
ensure the adequate backup time for battery.
2. The battery cold start can also be used to start the UPS from the Battery (charged) mode upon mains failure. Therefore, the
battery power can be used independently for improving the system availability to some extent.
1.5.4 ECO Mode (For Single UPS 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 power equipment
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 abnormal bypass voltage appears when the output is not overloaded, the UPS will
transfer to Normal mode. However, if the bypass failure or abnormal bypass voltage appears when the output is overloaded, the
UPS will not transfer 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 transfer to Bypass mode if the inverter failure or UPS overtemperature appears. In
Battery mode (with no bypass mains), the UPS will shut down and stop the output if the inverter failure or UPS
overtemperature appears. In Fault state, the fault indicators will turn on, the buzzer will keep beeping, and the
corresponding fault information will be displayed on LCD.
1.5.6 Maintenance Bypass Mode
If maintenance and repair for UPS are needed, you can switch the load to the Maintenance Bypass through
maintenance bypass MCB, and the power to the load is not interrupted. The maintenance bypass MCB is located on
the front panel of the POD, and the capacity meets the requirements of total load capacities. Refer to
Liebert
®
ITA
16kVA And 20kVA UPS Power Output Distribution Unit User Manual
for the detailed introductions of the POD.
Note
When the UPS has malfunctions and can not working normally, please get in touch with the nearest Emerson branch office or
local service center. It is prohibited to repaire the UPS by yourself, otherwise the personnel injury and damage to the equipment
will occur.
1.6 Specifications
The specifications are listed in Table 1-2.
