Vertiv | Liebert® EDGE | Installer/User Guide
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Table 3-4 Operating Mode Description
Operating mode Description
Operating mode
When the input voltage is within voltage regulated range, UPS will power the output
directly from the mains. In this mode, when battery is fully charged, the fan will stop
working for energy saving.
Normal mode
When the input voltage is higher than the voltage regulation range but lower than
high loss point, the buck AVR will be activated.
Buck mode when AC is normal.
When the input voltage is lower than the voltage regulation range but higher than low
loss point, the boost AVR will be activated.
Boost mode when AC is normal.
When the input voltage is beyond the acceptable range or power failure, the UPS will
backup power from battery and alarm is sounding every 10 seconds.
Battery mode
When the input voltage is beyond the acceptable range or power failure, the UPS will
backup power from battery and alarm is sounding every 10 seconds.
Standby mode UPS is powered o and no output supply power, but still can charge batteries.
Fault mode When a fault has occurred, there is not output supply power.
Table 3-5 Faults
Fault Cause
DC/DC fault
The discharger is faulty, because the bus voltage exceeds the setting range when
discharger starts or soft starts.
DC bus abnormal The inverter is o when DC bus voltage is faulty.
Inverter fault
The inverter is o when the inverter output voltage and current exceed the setting
range.
Inverter output short circuit The inverter short circuit.
Battery voltage abnormal The battery voltage exceeds the normal range.
Over temp
Internal heat sink temperature or ambient temperature exceeds the setting range,
and the output is o.
Overload UPS is overload
Charger failure The charger does not have output and battery voltage is less than 10V/PC
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