Allen-Bradley 1606-XLS240-UPSC Reference Manual page 13

DC-UPS with Integrated battery - 24V, 10 A
State of Health (SOH) Test
The battery has a limited service life and needs to be replaced in a fixed interval
that is defined by the specified service life (according to the Eurobat guideline),
based on the surrounding temperature and the number of charging and
discharging cycles. If the battery is used longer than the specified service life, the
battery capacity degrades. The SOH test cannot determine a gradual loss in
capacity. However, it can detect a battery failure within the specified service life
of the battery. Therefore an SOH test is included in the DC-UPS.
The SOH test consists of different types of tests.
During Charging
If the battery does not reach the ready status within 30 hours, it is considered to
be defective. The reason could be a broken cell inside the battery.
During Operation
Once the battery is fully charged, a voltage drop test and a load test are performed
alternately every 8 hours. Three of the tests must consecutively produce negative
results to indicate a battery problem.
A battery problem is indicated with the yellow LED (replace battery pattern) and
the relay contact Replace Battery. It can take up to 50 hours until a battery
problem is reported. This should avoid nuisance error messages as any urgent
battery problems are reported by the Check Wiring test and create a warning
signal.
The battery tests require up to 50 hours uninterrupted operation. Any
interruptions in the normal operation of the DC- UPS may result in the Replace
Battery test cycle to start over.
When replace battery is indicated, replace the battery as soon as possible.
Rockwell Automation Publication 1606-RM003A-EN-P - March 2019 13