10 Chapter 1 Overview
Liebert EXM 80kVA ~ 200kVA UPS User Manual
Trigger: Start up through the TOUCHSCREEN.
Note:
1. The battery will continuously discharge to the battery undervoltage 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.
2. The user can manually stop the capacity self-test operation through the TOUCHSCREEN.
1.5.3
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).
1.6
Battery Protection
Warning
The user must select an appropriate MCCB to protect against short circuit and overload for the battery. It is
recommended to adopt Vertiv BCB to provide a better solution.
The following battery protection functions are set by the service engineer through the Vertiv setting
software.
Battery low pre-warning
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.
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 1.60V/cell to 1.90V/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.
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