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).
2.6 Battery Protection
W ARN ING ! T he user m ust select an appropriate M C C B to protect again st short circuit and
overload for the battery. W e recom m end 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).
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.
2 Overview
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Vertiv™ Liebert® APM Plus User Manual
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