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Chapter 12 Helpful information
Advanced battery management
This UPS unit comes with the Advanced Battery Management (ABM) function. ABM is a set of
charger controls and automated battery tests. The cyclic charging schemes enable periods of
time when the battery is being fully charged and periods of time when the charger is disabled.
The life of the battery depends on the ambient temperature, the number of duty cycles, and
the prevention of internal corrosion of a battery. Internal battery corrosion is caused by current
flowing through the battery. Internal corrosion can be reduced if the battery is charged and
discharged as little as possible. When the battery is charged only when necessary, it is called
intermittent charging. After the battery is fully charged, it has the following charge cycles:
2 days charging
28 days resting
2 days charging
28 days resting
Intermittent charging means that corrosion is occurring only during the 2-day charging cycle.
This means that 90% of the time there is no additional corrosion. During this 30-day cycle, the
battery voltage drops by less than 2 %, which has no effect on the backup time of the UPS.
During the resting time, the ABM function constantly monitors the battery status. If the voltage
drops below a predetermined alarm level, the charging cycle is started again. The same
happens if the UPS is needed during the rest period to backup a power failure. This increases
the battery life by an average of 50 %.
If the voltage per cell reaches 2.1 volts on the batteries within the first 10 days of the rest
period, a battery failure alarm occurs.
If the voltage per cell reaches 2.1 volts after the first 10 days of rest, the batteries are charged
again for two days. In this case, the rest cycle might be shorter than 28 days as the batteries
age.
The ABM function has no impact on the daily operation of the UPS.
This feature is permanently in operation by default. The ABM charging function can be turned
off through the battery charge mode menu by selecting the
LCD panel.
230
Constant Charge mode
6U Rack or Tower UPS RT8kVA and RT11kVA IUOMG
via the UPS
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