2.5 Battery Management
The following battery management functions are set by the service engineer through the Vertiv firmware setting.
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
fast recovery of battery capacity. The charge current can be set.
2. Constant voltage boost charge
Adopt the constant voltage to charge the battery. This function can be used for fast recovery of battery capacity.
For VRLA batteries, the maximum boost charge voltage should not exceed 2.4 V/cell.
3. Float charge
This charging method is used to keep battery in full capacity. The float charge voltage is generally low. This
function can balance the capacity loss due to battery self discharge, and can be used for battery capacity
recovery.
For VRLA batteries, the float charge voltage should be between 2.2 V/cell and 2.3 V/cell.
4. Automatic transfer to float charge
When the charge current is less than 'Threshold of Equalize Charge to Float Charge' or 0.5 A, 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 1.60 V/cell to 1.90 V/cell
(VRLA).
7. Battery low pre-warning time
The battery low pre-warning time is adjustable between 3 min and 60 min. The default setting is 5 min.
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 firmware setting.
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 software setting.
2 Overview
15
Vertiv™ Liebert® APM Plus User Manual
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