Allen-Bradley 1606-XLS240-UPSC Reference Manual page 27

Replacement Intervals
Batteries have a limited life time. They degrade slowly beginning from the
production and need to be replaced periodically. The design life figures can be
found in the individual data sheets of the batteries and usually is specified
according to the Eurobat guideline or according to the manufacturers
specifications.
The design life is the estimated life based on laboratory condition, and is quoted
at 20 °C (68 °F) using the manufacturers recommended float voltage condition.
According to the Eurobat guideline, design lives have been structured into the
following different groups.
Replacement Interval Description
3...5 years This group of batteries is popular in standby applications and in small emergency
equipment. This represents a 4-year design life with a production tolerance of ±1 year.
6...9 years This group of batteries is used when an improved life is required. This represents a 7.5
year design life with a production tolerance of ±1.5 years.
10...12 years This group of batteries is used when in applications where longest life and highest safety
level are required. This represents an 11 year design life with a production tolerance of
±1 year.
A battery failure within the specified design life of the battery usually results in a
complete loss of the battery function (for example, a broken cell or anomaly
connection) and is detected and reported by the periodical battery tests that are
included in the 1606-XLS240-UPSC control unit.
If the operational parameters differ from those that are specified for the design
life, an earlier change of the battery might be necessary. The real life is called
service life and is defined as the point at which the cells actual capacity has
reached 80% of its nominal capacity. At the end of the service life the capacity
degrades much faster, so that a further use of the battery is not recommended.
Effect of Temperature
The temperature has the most impact in the service life. The hotter the
temperature, the earlier the wear-out phase of the battery begins. The wear-out
results in a degradation of battery capacity.
Effect of Discharging Cycles
The number as well as the depth of discharging cycles is limited. A replacement of
the battery might be necessary earlier than the calculated service life if the battery
exceeds the numbers and values of
Rockwell Automation Publication 1606-RM003A-EN-P - March 2019
DC-UPS with Integrated battery - 24V, 10 A
Figure 28.
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