UPS systems use large capacitor
banks made up of both DC
electrolytic and AC polymeric film
capacitors that can degrade under
field operating conditions.
Proactively replacing a full bank
of capacitors is the best way to
ensure they don’t age to a point
of probable failure. Replace your
capacitors and extend the life of
your UPS before it’s too late.
Field Aging:
•Chemical reactions through heat, oxygen, and moisture
lead to deterioration of materials necessary to withstand
applied voltage.
•All insulating materials experience some leakage current
that flows through a small channel and gives rise to
localized heating.
•Capacitors are not static electrical components that
operate in a circuit. Over time, their ability to withstand
voltage and pressure changes is diminished, which can
lead to downtime.
Service Life & Reliability:
•The expected service life of capacitors can vary
significantly based on several factors including age,
operating conditions and load.
•Replacing capacitors before they fail or show significant
signs of degradation is a reliable approach to achieving
long service life and avoiding unplanned downtime.
•Reliability is calculated based on a specific set of
operating conditions and operating time. Varying
conditions within your data center affect the
performance and life of the capacitors in your UPS.
Personalized Replacement:
•All data centers are different. Liebert Services provides
the proactive means to replace your full bank of
capacitors based on your equipment’s age, operating
conditions, and when it was last replaced.
•Capacitors can be replaced during a preventive
maintenance visit with no damage to the UPS.
The top line of the above graph shows ideal capacitor aging,
while the blue bars show realistic aging.
•A replacement program for capacitors based on
historical field data is the most reliable way to predict
ideal replacement time.
CAPACITOR REPLACEMENT
Plan for Full Bank Capacitor
Replacement to Keep Your
UPS System Running
Liebert Services
CAPACITOR REPLACEMENT
Rely on the Industry Leader
to Protect and Extend the
Life of Your UPS System
Capacitors can and do fail unexpectedly.
Knowing how to get the most out of
your capacitors and precisely when
to replace them requires knowledge
of data center infrastructure and
your equipment. The factory-trained
technicians at Emerson Network Power,
Liebert Services have expertise in both.
•Expertise — Liebert Services has industry-leading expertise in
UPS maintenance replacing thousands of capacitors each
year. Our technical support experts have an average of 17
years of experience working on Liebert equipment.
•Reliability — Capacitors used on Liebert UPS systems are
designed by Liebert Engineering to meet all applicable
industry safety standards — ensuring peace of mind.
•Responsiveness — Our experienced team of 650 CEs and
factory-trained technicians, plus 22 power technical support
staff, are located throughout the United States and are
available when and where you need them.
•Preventive Maintenance — During regularly planned
preventive maintenance of your UPS, our technicians are
able to identify potential problems. This critical, proactive
measure allows our experts to evaluate factors other than
age that affect capacitor performance, such as environment,
usage and load.
•End of Life — Inevitably, the capacitors in your UPS will fail.
The key is timely replacement. Our CEs can assess the
condition of your UPS to determine if full bank capacitor
replacement is necessary based on all the factors affecting
your UPS.
Getting preventive maintence from a Liebert Services Customer
Engineer (CE) often reveals easy-to-resolve capacitor issues.
•Battery Integration — Aging DC capacitors can contribute
to the degradation of your batteries and shorten their usable
life cycle. Replacement of these capacitors will help ensure a
longer mean time between failures of the UPS and extend
the life of your UPS batteries.
EmersonNetworkPower.com
800 LIEBERT (543 2378)
CS-00137 (11/15)
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property of their respective owners. ©2015 Emerson Electric Co.
Liebert Services
CAPACITOR REPLACEMENT