2.5.2 Advanced Function
The UPS provides battery maintenance test function. At periodic intervals, 20% of the rated capacity of the battery will be
discharged automatically, and the actual three-phase load must exceed 20% of the nominal UPS capacity. If the load is less
than 20%, the automatic discharge cannot be executed, and the system only supports manual command of maintenance test.
The periodic interval can be set from 30 to 360 days. The battery maintenance test function can be disabled through the
Vertiv setting software.
Conditions: Battery at float charge for at least 5h, load equal to 20 ~ 100% of rated UPS capacity.
Trig g er: Automatically or manually through the command of battery maintenance test on TOUCHSCREEN.
Interval: 30 ~ 360 days (default setting: 60 days).
The UPS also provides battery capacity self-test function: Periodically test the battery activity, test the battery residual
capacity, judge the battery quality, and then provide corresponding measures. The capacity self-test is started by the user
through the operator control and display panel. During the capacity self-test, the battery will continuously discharge to the
battery undervoltage shutdown threshold. After the self-test is finished, the system will update the battery curve table. The
capacity self-test command is valid only one time, without any memory. During the capacity self-test, if the battery
maintenance requirement is satisfied, the system will generate audible/visual alarm and give corresponding records.
Conditions: System load rate within 20% ~ 100%, battery float charge at least 5h, and generator not connected; the current
system is in float charge state.
Trig g er: Start up through the TOUCHSCREEN.
N O T E: T he battery will contin uously d ischarge until it reaches its und ervoltage shutdow n threshold ,
then the battery transfer to the charging state. W hen the capacity self-test is fin ished, the system
w ill update the battery curve table accordingly.
N O T E: T he user can m anually stop the capacity self-test operation throug h the TOU CH SC REEN .
2.5.3 Battery Temperature Compensation
The UPS system has battery charge temperature compensation function. When the ambient temperature is increased, the DC
bus voltage (which charges the battery) will be reduced correspondingly to provide optimal charging voltage for the battery,
thus prolonging the battery service life time.
This function must be used together with the Vertiv battery temperature detection device (a standard option).
2 Overview
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Vertiv™ Liebert® EXM2 UPS User Manual
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