8 Chapter 1 Overview
Liebert EXM 80kVA ~ 200kVA UPS User Manual
single-input load, an STS can be installed to power the load. For the operation principle diagram of the
LBS mode, see Figure 7-5 and Figure 7-6.
1.5
Battery Management
The following battery management functions are set by the service engineer through the Vertiv setting
software.
1.5.1
Normal Function
1. Constant current boost charge
Adopt the constant current (within battery charging limit) to charge the battery. The 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. The 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
The charging method is used for keeping battery with a full capacity. The float charge voltage is generally
low. The 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.
Summary of Contents for EXM 0080kTK16FN01000
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