Rockwell Automation Publication 1606-RM008A-EN-P - November 2021 31
DC-UPS - 24V, 20 A, 480 W Reference Manual
precise battery charging and testing which results in the longest possible
battery life.
The battery module is available in two different options. It can be ordered with
assembled batteries (1606-XLSBATASSY4) or as a battery bracket without
batteries (1606-XLSBATBR4), allowing for different battery options. The
mounting bracket option also allows the batteries to be assembled just in time,
avoiding outdated batteries due to limited shelf life.
Application Notes Battery Replacement Intervals
There are two main causes for battery failures and the need for replacing them:
- Random failures: Within the defined service life of a battery, random battery
failures can happen. For example, short circuit in one cell, broken cell
connection, acid pollution, and mechanical defects. Such failures occur
randomly and cannot be predicted. The 1606-XLS480-UPS has various battery
test features included, which periodically test both batteries individually and
report such failures. These battery tests include:
• Battery presence test, performed every 10 s
• Battery dynamic impedance test, performed every 4 hours
• Charging time period (max 40 h in <10 Ah settings and max 170 h in
>10Ah settings) Battery tests start as soon as the batteries are fully
charged (the green status indicator must be on solid). Battery dynamic
impedance tests must fail several times in a row before “replace battery”
is reported. This can take up to 14 additional hours after the batteries are
fully charged.
- Wear-out failures: The electrical characteristics of batteries degrade slowly
over time. Main causes are chemical effects, which can be calculated.
Therefore, battery manufacturers specify the design life of batteries to be able
to calculate the expected service time. The degradation of a battery cannot be
easily tested on a running system. Therefore and the results from the battery
tests of the 1606-XLS480-UPS (random failures), a periodical replacement is
strictly recommended.
Service and design life of a battery:
Batteries have a limited service life and must be replaced periodically. The
service life depends on the grade of the battery, which is expressed in the
design life. The design life figures can be found in the individual data sheets of
the batteries and is specified according to the Eurobat guideline.
The design life is the estimated life, that is based on laboratory condition, and
is quoted at 20 °C using the manufacturer’s recommended float voltage
Attribute Value
Battery voltage DC 24V
Battery capacity 12 Ah
Temperature sensor PT1000
Dimensions WxHxD 203 x 186 x 143 mm (7.99 x 7.32 x 5.63 in.)
Weight 1606-XLSBATASSY4 / 1606-XLSBATBR4 9000 g / 900 g (19.84 lb / 1.98 lb)
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