Ups State And Operation Modes; Normal Mode; Bypass Mode; Battery Mode - Liebert S600 User Manual

UPS State and Operation Modes

1.5
The UPS state and operation mode include: Normal mode, Bypass mode, Battery Mode, ECO mode, Fault State mode
and Maintenance Bypass mode. The operation schematic diagrams of Normal mode, Bypass mode, Battery Mode and
Maintenance bypass mode are shown in Figure
1.5.1

Normal Mode

When the mains input is normal, the load is supplied with voltage-stabilizing and frequency-stabilizing power by the
mains after processing of the rectifier and the inverter, and meanwhile, the charger is charging the battery. The
operation mode is Normal mode.
In Normal mode, the run indicator (green) is on, the alarm indicator is off, and the buzzer is silent.
1.5.2

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 run indicator (green) is on, alarm indicator (yellow) is on, and the buzzer beeps every second. The
'Current' page in LCD will display 'On Bypass'.
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. In Battery mode, the run indicator (green) is on, alarm indicator (yellow)
is on, and the buzzer beeps every second. The 'Current' page in LCD will display 'On Battery'.
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 with External Battery 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.
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 94%.
Vertiv|Liebert® S600 10kVA ~ 20kVA UPS | User Manual 15