Specifications

Liebert Nfinity UPS Guide Specification
4kVA –20kVA (208/120 or 240/120) 4/03 Rev 2
SL-23956
8
bypass. The manual bypass does not wrap around the EMI filtering, overcurrent protection or
isolation transformer.
The UPS will initiate an audible alarm upon transfer to manual bypass. The audible alarm is
capable of being silenced by the user. The alarm will continue to sound (unless silenced)
while in bypass mode. This shall provide a reminder to the user that the load continues to be
powered from utility supply alone.
2.2.7 Internal Battery
Flame retardant, valve regulated, gas recombination, lead acid batteries shall be used as a stored-
energy source for the specified UPS system. The battery is housed in separate replaceable modules
that slide into any open bay of the UPS cabinet, and are sized to support the inverter at rated load and
power factor, in an ambient temperature between 20° and 25° C, for a 7 minutes reserve time. The
expected life of the battery is 3 to 5 years or a minimum 250 complete discharge cycles. For extended
battery reserve time, additional battery modules may be added if the frame size allows; external
battery cabinets are available as an option.
2.3 COMMUNICATIONS
The UPS allows for flexibility in communications via (2) DB9 communication ports and (4) Intellislot
ports on the rear of the UPS. The UPS is able to communicate through two communications ports
simultaneously; the media of either communications port may change without affecting the operation
of the UPS. The use of a Liebert RELAYCARD-INT will not affect the operation of the two
communications ports.
2.3.1 Relay Contacts
The relay contacts are available through one DB-9F communication connector, and are compatible
with the MultiLink software. The UPS can communicate via relay contact closure the following
information:
Low Battery & On Battery
One connector provides relay contacts fitted on all UPS models as standard (designated comm port 1).
Relay contacts are rated for 48 VDC, 1 A. Additional signals (such as on bypass and summary alarm)
are provided via the RELAYCARD-INT card option.
The following pins for Comm port 1 are used:
Pin 1 Low Battery (normally open)
Pin 4 Shutdown in battery mode (5-12 VDC for 1.5 sec)
Pin 5 Common
Pin 7 Low Battery common
Pin 8 On Battery (normally open)
Pin 9 On Battery common
2.3.2 Serial Communications
The Nfinity UPS is able to communicate via Liebert proprietary protocol through the following
communication port:
Comm port 2 (standard on UPS)
The serial port on the UPS will only communicate with Liebert software such as MultiLink.
The pin-out configuration for Comm port 2 is as follows:
Pin 2 Transmit Data
Pin 3 Receive Data
Pin 5 Common
2.3.3 Intellislot Specification
All models of the Nfinity UPS product line have four Intellislot ports standard. Liebert Intellislot
cards, such as the MultiPort 4 card, and RELAYCARD-INT, OpenComms Webcard are compatible.