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6.4 Battery Management—Set During Commissioning
6.4.1 Normal Function
• Constant charging current—Current can be set up to limit charging power.
• Constant boost voltage (if applicable)—Voltage of boost charging can be set as required by the
type of battery.
For Valve Regulated Lead Acid (VRLA) batteries, maximum boost charge voltage should not
exceed 2.4V / cell.
• Float Charge—Voltage of float charging can be set as required by the type of battery.
For VRLA, float charge voltage should be between 2.2V to 2.3V.
• Float Charge Temperature Compensation (optional)—A coefficient of temperature compen-
sation can be as required by the type of battery.
• End of discharge protection (EOD)—If the battery voltage is lower than the EOD, the battery
converter will shut down and the battery is isolated to avoid further battery discharge. EOD is
adjustable from 1.6V to 1.75V per cell (VRLA) or 0.9 to 1.1 V per cell (NiCd).
• Battery Low Warning Time—Adjustable between 3 and 60 minutes. The default is 5 minutes.
6.4.2 Advanced Functions (Software Settings Performed by the Commissioning Engineer)
Battery Self-Test and Self-Service
At periodic intervals 20% of the rated capacity of the battery will be discharged automatically at a
rate equal to 15% (kW) of the rated UPS (kVA) capacity. During discharge the rectifier provides the
balance necessary to feed the load. The minimum amount of load must exceed 20% of the nominal rat-
ing of the UPS module. If the load is less than 20%, auto-discharge cannot be executed. The periodic
interval can be set from 30 to 360 days. The periodic testing can also be inhibited.
• Conditions—Battery at float charge for at least 5 hours, load 20~100% of rated UPS capacity
• Trigger—Manually through the command of Battery Maintenance Test in LCD panel or auto-
matically
• Battery Self-Test Interval—30-360 days (default setting is 60 days)
6.5 Battery Protection (settings by commissioning engineer)
Battery Undervoltage Pre-warning
The battery undervoltage pre-warning occurs before the end of discharge. After this pre-warning, the
battery should have the capacity for 3 remaining minutes discharging with full load. The time is user
configured from 3 to 60 minutes.
Battery End of Discharging (EOD) Protection
If the battery voltage is lower than the EOD, the battery converter will be shut down. EOD is adjust-
able from 1.6V to 1.75V per VRLA cell (or 1.0 to 1.1 V per NiCd cell).
Battery Contactor Fault Warning
If the battery contactor monitor status is different from the drive signal, this warning will occur.
Battery Disconnect Devices
For 30- 40kVA models with internal batteries and for any model fitted with a Battery Start kit, the
UPS contains an internal contactor for automatic connection and disconnection of the batteries. The
relevant features are:
• Low battery safety cutoff
• Connect/disconnect status displayed via LCD
• Overcurrent protection
• Maximum discharging time protection (1 to 72 hours)
For models above 40kVA and not fitted with an internal contactor:
The features above (except automatic connect) are performed by connecting the external battery to
the UPS through an external battery circuit breaker, which is manually closed and electronically
tripped via the UPS control circuits.