• 100% ≥ Load ≥ 20%
• Generator not connected.
• Trigger:
• Manually through the GHMI.
• Effect:
• Discharging until battery capacity is 20% and update the battery discharging curve.
NOTE: The battery will continuously discharge to the battery under voltage shutdown threshold, then the battery
transfer to the charging state. When the capacity self-test is finished, the system will update the battery curve table.
NOTE: The user can manually stop the capacity self-test operation using the touch screen.
7.1.3 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.
This function must be used together with the Vertiv battery temperature detection device (a standard option).
7.2 Battery Protection
WARNING! The user must select an appropriate MCCB to protect against short circuit and overload for the
battery. We recommend using Vertiv BCB box to provide a better solution.
The following battery protection functions are set by the service engineer through the Vertiv software setting.
Battery low pre-warning
The battery low pre-warning occurs before the EOD. After this pre-warning, the battery should have the capacity of three
minutes discharging with full load. The time can be configured from 3 min to 60 min.
EOD protection
When the battery voltage drops to the EOD voltage, the battery converter shuts down automatically. For VRLA batteries, the
EOD voltage is adjustable from 1.60 V/cell to 1.90 V/cell (VRLA). APM2 lithium battery high-rate battery module: charge and
discharge range 2.7 V ~ 4.1 V, discharge protection is 2.5 V.
BCB alarm
The BCB alarm occurs when the external BCB opens, if you select the Vertiv BCB (optional).
The external battery connects to the UPS through the BCB. The BCB is manually closed and tripped by the UPS control
circuit. The UPS battery pack consists of several batteries connected in series to provide the rated DC input voltage for the
UPS inverter. The required battery backup time (that is, the duration of the battery supplying power to the load when the
mains power is interrupted) is limited by the ampere hours of each battery. Therefore, sometimes several groups of batteries
need to be connected in parallel.
During maintenance or repair, the battery must be disconnected from the UPS. This operation can be realized by a battery
switch of suitable capacity. The switch must be installed as close to the battery as possible, and the power and signal cable
routing distance between the UPS and the UPS should be as short as possible.
7 Battery Proprietary and Confidential ©2023 Vertiv Group Corp. 125
Vertiv™ Liebert® APM2 30 to 120 kVA Modular UPS User Manual
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