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4.3.3 Limited Life Components
Your Liebert 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 your UPS wherever
practical and cost-effective. However, due to current component material and manufacturing technol-
ogy limitations, a few components in your Liebert UPS will wear out and require replacement in less
than 10 years.
The following limited-life components are utilized in your UPS system. To prevent a wear-out failure
of one of these components affecting your critical load operations, Liebert recommends these compo-
nents be periodically inspected and replaced before their expected wear-out life. Individual users may
have site-specific requirements that differ from these typical life expectations.
Power capacitors are considered “failed” when their measured capacitance is -5% below their name-
plate rating. Typically, storage batteries are “worn out” when their full-load reserve time is -20%
below rated. Site-specific battery plants may have different end-of-life requirements. Fans and blow-
ers typically will stop rotating or rotate slower than expected.
In most cases, replacement components must exactly match the original component specifications and
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 Global Services (LGS) Preventive Maintenance Services, periodic inspec-
tion of these components is part of this service, as well as recommending replacement intervals to cus-
tomers to avoid unanticipated interruptions in critical load operations.
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
Squirrel-cage blowers
10 years
(~87,600 hours)
8 to 9 years
Air filters, disposable
(see also 4.3.2 - 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
prior to end-of-life
Valve-regulated lead-acid
(VRLA)
5 years 3 to 4 years
10 years 6 to 8 years