2.5 Battery Management
The following battery management functions are set by the service engineer through the Vertiv setting software.
2.5.1 Normal Function
1. Constant current boost charge
Adopt the constant current (within battery charging limit) to charge the battery. This function can be used for battery
capacity fast recovery. The charge current can be set.
2. Constant voltage boost charge
Adopt the constant voltage to charge battery. This function can be used for battery capacity fast recovery. For VRLA
batteries, the maximum boost charge voltage should not exceed 2.4V/cell.
3. Float charge
This charging method is used for keeping battery with a full capacity. The float charge voltage is generally low. This function
can balance the capacity loss due to battery self discharging, and can be used for battery capacity recovery.
For VRLA batteries, the float charge voltage should be between 2.2V/cell and 2.3V/cell.
4. Automatic transfer to float charge
When the charge current is less than 'Threshold of Equalize Charge to Float Charge' or 0.5A, the charger will automatically
transfer from boost charge to float charge. When boost charge time exceeds the limit of 'Equalize Charge Protect Time Limit',
the charger will be forcibly transferred to float charge for protecting the battery.
5. Float charge temperature compensation (optional)
This function must be used together with the battery temperature detection device. The Vertiv battery temperature sensor is
a standard option for your selection.
6. EOD protection
When the battery voltage drops to the EOD voltage, the battery converter shuts down automatically and the battery is
inhibited to avoid further battery discharge. The EOD voltage is settable from 1.60V/cell to 1.90V/cell (VRLA).
7. Battery low pre-warning time
The battery low pre-warning time is adjustable between 3min and 60min. The default setting is 5min.
8. Maximum battery discharge time
When the battery has small current discharge for a long time, the battery is over discharged and even has unrecoverable
damage, thus setting a battery discharge time to protect the battery is essential. The limit of time setting shall be configured
by service engineer through the Vertiv setting software.
9. Maximum boost charge protection time
To protect against the battery overcharge damage caused by long time boost charge, a protect time setting is essential. The
limit of time setting shall be configured by service engineer through the Vertiv setting software.
2 Overview
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Vertiv™ Liebert® EXM2 UPS User Manual
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