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Introduction
5
1.0 INTRODUCTION
The Liebert
®
APM
™
UPS is a transformer-free, hardware-scalable, online uninterruptible power
system with 208/120V input and 208/120V output capability. The Liebert APM can operate with
either a 50 or 60Hz input and provide a matching output. The rack mounted 15kVA/kW modules
allow scaling the UPS’s capacity in 15kVA increments from 15kVA to a maximum of 90kVA in a
single frame.
Optional transformers are available to add 480V or 600V input capability to the Liebert APM in both
the UPS, 90kVA/kW frame only, or the Bypass Distribution Cabinet (BDC) in either the 45kVA/kW or
the 90kVA/kW frame.
The Liebert APM UPS is a SmartAisle™ technology, appropriate for use with the SmartAisle design
approach.
The Liebert APM provides continuous, high-quality AC power to business-critical equipment, such as
telecommunications and data processing equipment. The Liebert APM 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 APM 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.
Two frame sizes are available: 45kVA/kW and 90kVA/kW. The 45kVA/kW frame is designed to accept
internal batteries; the 90kVA/kW frame does not. The 90kVA frame is, however, designed to accept
Internal Transformers and a four-breaker bypass.
1.1 Limited Life Components
The Liebert APM UPS has a design life well in excess of 10 years. Well-maintained units can continue
to provide economic benefits for 20 years or more. Long-life components are used in the UPS wherever
practical and cost-effective. However, due to the currently available component material,
manufacturing technology limitations and the general function and use of the component, a few
components in your Liebert UPS will have a shorter life cycle and require replacement in less than 10
years.
The following components utilized in your UPS system have a limited life cycle and are specifically
exempt from warranty. To prevent a wear-out failure of one of these components affecting your
critical load operations, Liebert recommends these components be periodically inspected and replaced
before the expected expiration of their life cycle. The expected life of each component listed below is
simply an estimate and is not a guarantee. Individual users may have site-specific requirements,
maintenance and other environmental conditions that affect the length of the component's useful life
cycle.
In most cases, replacement components must exactly match the original component specifications.
These replacement components are not readily available from third-party component distributors.
For assistance with your specific component specifications, replacement component selection and
sourcing, call 1-800-LIEBERT. For customers using Emerson Network Power Liebert Services’
preventive maintenance services, periodic inspection of these components is part of this service, as
well as recommending component replacement intervals to customers to avoid unanticipated
interruptions in critical load operations.
Table 1 Component service life
Component Expected Life Replace in:
Air filters 1 to 3 years Check four times per year
Valve-regulated, lead-acid (VRLA) 10 years 6 to 8 years