Emerson 250-400kVA - Manual (Page 40)

Maintenance
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3.3.3 Limited Life Components
The Liebert NXL 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, manufactur-
ing 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 criti-
cal 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 Liebert Services’ preventive maintenance ser-
vices, periodic inspection of these components is part of this service, as well as recommending compo-
nent replacement intervals to customers to avoid unanticipated interruptions in critical load
operations.
3.4 Battery Maintenance
Table 1 UPS component service life
Component Expected Life Replace in:
Power AC filter capacitors > 7 years (~62,000 hours) 5 to 6 years
Power DC filter capacitors > 7 years (~62,000 hours) 5 to 6 years
Low-profile fans > 7 years (~62,000 hours) 5 to 6 years
Air filters 1 to 3 years Check four times per year
Battery, lithium logic memory
backup
10 years (~87,600 hours) 8 to 9 years
Battery, storage
Lead-acid wet-cell (user selection)
10 to 20 years 1 to 2 years before end-of-life
Valve-regulated, lead-acid (VRLA)
5 years 3 to 4 years
10 years 6 to 8 years
!
WARNING
Risk of electrical shock and high short circuit current. Can cause equipment damage, personal
injury and death.
These maintenance procedures will expose hazardous live parts. Refer servicing to properly
trained and qualified personnel working in accordance with applicable regulations as well as
with manufacturers’ specifications.
DC fuses operate at the rated battery voltage at all times. A blown DC bus fuse indicates a
serious problem. Serious injury or damage to the equipment can result if the fuse is replaced
without knowing why it failed. Contact Liebert Services for assistance.