Emerson Liebert eXM - 1 Introduction

Introduction
7Liebert
®
eXM
™
1.0 INTRODUCTION
The Liebert eXM UPS is a fixed-capacity, transformer-free, online uninterruptible power system with
208/120V input and 208/120V output capability. The Liebert eXM can operate with either a 50 or
60Hz input and provide a matching output frequency conversion.
Optional transformers are available to add 208V isolation or 480V or 600V input capability to the
Liebert eXM in the optional Liebert BDC
™ (
Bypass Distribution Cabinet) and in the optional Liebert
eXM Dual Transformer Cabinet.
The Liebert eXM provides continuous, high-quality AC power to business-critical equipment, such as
telecommunications and data processing equipment. The Liebert eXM supplies power free of the
disturbances and variations in voltage and frequency common to utility power, which is subject to
brownouts, blackouts, surges and sags.
The Liebert eXM utilizes the latest in high-frequency, double-conversion pulse width modulation
(PWM) technology and fully digital controls to enhance its reliability and increase the ease of use.
The 60-100kVA/kW Liebert eXM requires external batteries to support the load when utility power is
not present. For ancillary cabinets, refer to 2.6 - Auxiliary Cabinets.