
Chapter 5 Operations
Shield M10U user manual
33
5.4 Battery Management—Set During Commissioning
5.4.1 Normal Function
1. Constant Current Boost Charging
Current can be set up as 0%~20%, default setting is 10%.
2. Constant Voltage Boost Charging
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.
3. 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, default setting is 2.25V.
4. Float Charge Temperature Compensation (optional)
A coefficient of temperature compensation can be set as required by the type of battery.
5. End of Discharge (EOD) Protection
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).
5.4.2 Advanced Functions (Software Settings Performed by the Commissioning Engineer)
Battery self-test and self-service
At periodic intervals, 25% of the rated capacity of the battery will be discharged automatically, and the actual load must
exceed 25% of the rated UPS (kVA) capacity. If the load is less than 25%, auto-discharge cannot be executed. The periodic
interval can be set from 720 to 3000 hours.
Conditions:
Battery at float charge for at least 5 hours, load equal to 25~100% of rated UPS capacity Trigger—Manually
through the command of Battery Maintenance Test in LCD panel or automatically Battery self-test interval.
5.5 Battery Protection (Settings by Commissioning Engineer)
Battery Low 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. And the
End of discharge (EOD) protection
If the battery voltage is lower than the EOD, the battery converter will be shut down. EOD is adjustable from 1.6V to
1.75V per cell (VRLA).
Battery Disconnect Devices Alarm
The alarm occurs when the battery disconnect device disconnects. The external battery connects to the UPS through the
external battery circuit breaker. The circuit breaker is manually closed and tripped by the UPS control circuit.
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