Emerson Nfinity 208- User Manual

Liebert Nfinity UPS

Guide Specification

4kVA –20kVA (208/120 or 240/120)

4/03 Rev 2

SL-23956

1

LIEBERT Nfinity UPS

GUIDE SPECIFICATIONS
for a 4 to 20kVA (208/120V or 240/120V)
Single-Phase Uninterruptible Power Supply System

1.0 GENERAL

1.1

SUMMARY

This specification describes the Nfinity UPS, a modular uninterruptible power supply system for wor kstation,
server, network, telecom and other sensitive electronic equipment applications. It defines the electrical and
mechanical characteristics and requirements for a continuous-duty single-phase, solid-state, uninterruptible
power supply system. The uninterruptible power supply system, hereafter referred to as the UPS, will provide
high-quality AC power.

1.2

STANDARDS

The UPS is designed in accordance with the applicable sections of the current revision of the following
documents. Where a conflict arises between these documents and statements made herein, the statements in this
specification shall govern.

UL Standard 1778
IEEE C62.41, Category A & B
CSA 22.2, No. 107.1
FCC Part 15, Sub Part B, Class A
National Electrical Code (NFPA 70)
IEC 62040-3 (formerly NEMA PE-l)

1.3 SYSTEM DESCRIPTION

1.3.1

General

The Nfinity UPS system consists of the appropriate number of modules for capacity and/or
redundancy. All modules are to be operating simultaneously and sharing the load. In a non-redundant
system, all the modules making up the UPS are required to supply the full rated load. If a power or
control module malfunctions, the load will transfer automatically to the bypass line. If a battery
module malfunctions, it will automatically isolate itself from the system. For redundant operation, the
UPS will have one or more modules than what is required to supply the full rated load. The
malfunction of one of the modules will cause that module to be isolated from the system and the
remaining module(s) will continue to carry the load. Replacement of a module is capable without
disturbance to the connected load (Hot-swappable/User Replaceable).

1.3.2

Modes of Operation

The UPS is designed to operate as a true on-line system:

A.

Normal

- The critical AC load is continuously supplied by the UPS inverter. The input converter

derives power from a utility AC source and supplies DC power to the inverter. The battery
charger maintains a float-charge on the battery.

B.

Back-up

- Upon failure of utility AC power the critical AC load is supplied by the inverter. In this

mode the inverter is powered from the battery. There is no interruption in power to the critical
load upon failure or restoration of the utility AC source.

C.

Recharge

- Upon restoration of utility AC power, the input converter will automatically restart

and resume supplying power to the inverter. The battery charger will resume recharge of the
battery.