Modes Of Operation; Normal Mode; Back-Up Mode; Auto Restart Mode - Liebert Nfinity User Manual

The Nfinity UPS is designed to operate as a true on-line system in the following modes:

Normal Mode

The Power Module's power factor correction circuitry
derives power from the AC Mains and supplies
regulated DC power to the inverter. The module's
inverter regenerates precise AC power to supply the
connected equipment. The battery charger maintains
a float-charge on the battery.

Back-Up Mode

When AC Mains fails, the connected equipment is
supplied power by the inverter, which obtains
energy from the battery modules. The connected
load will not be interrupted during the failure or
restoration of the AC Mains source.

Auto Restart Mode

After a power outage and complete battery
discharge, once the AC Mains is restored, the
UPS will automatically restart and resume
supplying power to the 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
INPUT
EMI
Filter
POWER
CONTROL

MODES OF OPERATION

POWER EMI
MODULE(S) Filter
BATTERY
MODULE(S)
USER
INTERFACE
CONTROL
INTERFACE
COMMUNICATIONS
6

Recharge Mode

When AC Mains is restored, the unit will then
automatically recharge the battery modules until
they are fully charged.

Bypass Mode

The bypass provides an alternate path for power to
the connected equipment and operates in the
following 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 activation of the bypass will cause an
immediate transfer of the equipment from the
inverter to the bypass source.
MANUAL
BYPASS
OUTPUT &
BYPASS
CONTACTOR
SYSTEM
CONTROL
MODULE
SYSTEM
CONTROL
MODULE
OUTPUT
OUTPUT
TRANSFORMER
220V - standard
230/240V - optional