2.6 Battery Protection
W A RN IN G! The user m ust select an appropriate M C C B to p rotect against short circuit an d
overload of the battery. It is recom m ended to adopt V ertiv B CB to provide a better solu tion.
The following battery protection functions are set by the service engineer through the Vertiv setting software.
Battery low pre-w arnin g
The battery low pre-warning occurs before the EOD. After this pre-warning, the battery should have the capacity for three
remaining minutes discharging with full load. The time can be configured from 3min to 60min.
EO D 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 1.60V/cell to 1.90V/cell (VRLA).
BC B 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® EXM2 UPS User Manual
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