Chapter 1 Product Introduction 5
Liebert
®
ITA 5kVA And 6kVA UPS User Manual
Note
In case of mains failure or mains voltage out of range (120Vac ~ 253Vac/265Vac/276Vac) in Bypass mode, the UPS will turn off
and stop the output.
1.5.3 Battery Mode
Upon mains failure, rectifier overload or mains voltage out of range (120Vac ~ 276Vac), the rectifier and the internal
charger will stop running, and the battery will supply power to the load through the inverter. The BATTERY indicator
and INVERTER indicator are on, and the buzzer alarms every 3.3 seconds, notifying 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 back-up 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.
3. In Battery mode, when the battery voltage is low, the buzzer beeps rapidly (once per second), and the corresponding measures
must be done in time.
1.5.4 ECO Mode
In ECO mode, when the bypass voltage is 220Vac/230Vac/240Vac ± 10% and the frequency is within 50Hz/60Hz ±
2Hz, the load is supplied by the bypass AC source and the BYPASS indicator is on. When the bypass voltage is
abnormal, the load is supplied by the inverter. 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.
When the bypass voltage is normal, the inverter is in no-load state, the load is supplied by the bypass AC source and
the BYPASS indicator is on.
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, and the bypass will be turned off.
2. In ECO mode, the efficiency of the UPS is up to 97%.
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 turn off 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 indicator will blink.
Note
In Fault state, if the bypass fails or bypass voltage is abnormal when the output is not overloaded, except for the faults which can
cause turn-off, the UPS will transfer to the inverter input, such as radiator over-hot. However, if the bypass fails or bypass voltage
is abnormal when the output is overloaded, the UPS will not transfer to the inverter input, and will turn off the bypass.
The UPS provides the relay card UF-DRY310 (optional) for user to realize the EPO function, refer to
UPS Extended
Relay Card User Manual
. The user should install the EPO function circuit at the UPS output port for the remote
emergency shutdown function if the relay card UF-DRY310 is not used.