User Manual 10H52188UM51 - Rev. 1 - 09/2011
9
Liebert NXC
Product Introduction
1.5.2
Normal Mode
When the mains input is normal, the load is provided with voltage-stabilized and frequency- stabilized power by the inverter,
and meanwhile the battery is charged.
In Normal mode, the inverter indicators are on (green).
1.5.3
Bypass Mode
If the overload overtime, inverter or rectifier failure appears during the UPS operation in Normal mode, the UPS will transfer to
Bypass mode, that is, the load is powered by the bypass source, which comes directly from the mains input; if the rectifier is
normal, the internal charger will charge the battery. In Bypass mode, the inverter indicators are off.
Note
In the event of mains failure or mains voltage out of range in Bypass mode, the UPS will shut down and stop the output.
1.5.4
Battery Mode
Upon mains failure, rectifier overload or mains voltage out of range, 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 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, so as 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.
1.5.5
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%.
1.5.6
FRC (Frequency Converter) Mode
This mode can be used for mains and load with different frequencies (60/50Hz or 50/60Hz).
1.5.7
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.
