Modes Of Operation - Liebert NfinityTM User Manual

1.2

Modes of Operation

INPUT
EMI
FILTER
Normal Mode
The Power Module rectifiers derive power from a utility AC source and supply regulated DC power to
the inverter. The module's inverter regenerates precise AC power to supply the connected equipment.
The battery charger is in the Power Module and maintains a float-charge on the batteries.
Backup Mode
When AC utility fails, the connected equipment is supplied power by the inverter, which obtains
energy from the Battery Modules. The output power equipment will not be interrupted during the
failure or restoration of the AC utility source.
Auto Restart Mode
After a power outage and complete battery discharge, and once AC utility is restored, the UPS will
automatically restart and resume supplying power to connected equipment. This feature is enabled at
the factory, but can be disabled by the user. The user can also program two auto restart delay settings:
1. Battery capacity level (%)
2. Countdown timer
Bypass Mode
The bypass provides an alternate path for power to the connected equipment and operates in the fol-
lowing manner:
• Automatic
In the event of an internal fault or should the inverter overload capacity be exceeded, the UPS
performs an automatic transfer of the connected equipment from the inverter to the bypass
source.
• Manual
Should the UPS need to be taken out of service for limited maintenance or repair, manual activa-
tion of the bypass will cause an immediate transfer of the equipment from the inverter to the
bypass source.
POWER
MODULE(S)
BATTERY
MODULE(S)
USER CONTROL
INTERFACE INTERFACE
COMMUNICATIONS
5
MANUAL
BYPASS
OUTPUT &
BYPASS
CONTACTOR
SYSTEM
CONTROL
MODULE(S)
Introduction
OUTPUT
OUTPUT
TRANSFORMER
POWER
CONTROL