Battery Mode; Eco Mode; Fault State; Maintenance Bypass Mode - Liebert UHA1R-0100 User Manual

1.5.3 Battery Mode

Upon mains failure, rectifier overload or mains voltage out of range (120Vac ~ 288Vac), 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
the inverter indicator are on, and the buzzer alarms every 3.3 seconds, which notifies you that the UPS is in Battery
mode.
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 the UPS is put into operation for the first time, to ensure
the adequate back-up time for the battery.
2. The battery cold start can also be used to start the UPS from 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 within 220Vac ± 10% and the frequency is within 50Hz ± 2Hz, the load is
supplied by the bypass and the bypass indicator is on. When the bypass voltage is abnormal, the load is supplied by
the inverter. The ECO mode is an energy-saving operation mode. For power equipment insensitive to power grid
quality, you can use ECO mode for power supply through the 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 and the
bypass indicator is on.
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 will shut down the bypass.
2. In ECO mode, the efficiency of the UPS is up to 97%.
3. Different voltage types have different voltages and frenency ranges.

1.5.5 Fault State

In Normal mode, the UPS will transfer to the 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. If a UPS failure occurs, the fault indicators will turn on, the buzzer will keep beeping, and
the corresponding indicator will blink.
In Fault state, if the bypass fails or the 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 for supply power, such as radiator over-hot. However, if the bypass fails
or the bypass voltage is abnormal when the output is overloaded, the UPS will not transfer to the inverter for supply power, and
will turn off the bypass.

1.5.6 Maintenance Bypass Mode

If maintenance and repair for the UPS are needed, you can switch the load to the Maintenance Bypass through the
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 the total load capacities. Refer to Liebert
10kVA UPS Parallel Power Distribution Unit User Manual for the detailed introductions of the POD.
Liebert ITA 10kVA UPS User Manual
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Chapter 1 Product Introduction
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