User manual

Chapter 4 Operation 31
NXr UPS Module And Parallel System 30kVA ~ 200kVA User Manual
The float charge voltage can be set as required by the type of battery.
For VRLA batteries, the float charge voltage should be between 2.2V/cell and 2.3V/cell.
4. Float charge temperature compensation (optional).
The temperature compensation coefficient can be set as required by the type of battery.
5. EOD protection.
When the battery voltage drops to the EOD voltage, the battery converter shuts down automatically and the battery is
isolated to avoid further battery discharge. The EOD voltage is settable from 1.6V/cell to 1.75V/cell (VRLA).
6. Battery low pre-warning time.
The battery low pre-warning time is adjustable between 3min and 60min. The default setting is 5min.
4.4.2 Advanced Function
The UPS provides an advanced function, battery maintenance test. At periodic intervals, 20% of the rated capacity of
the battery will be discharged automatically, and the actual load must exceed 20% of the rated UPS (kVA) capacity. If
the load is less than 20%, the automatic discharge cannot be executed. The periodic interval can be set from 30 to
360 days. The battery self-test can be disabled.
Conditions: battery at float charge for at least 5h, load equal to 20% ~ 80% of rated UPS capacity.
Trigger: manually through the command of Battery Maintenance Test in LCD or automatically.
Battery maintenance interval: 30 ~ 360 days (default setting: 60 days).
4.5 Battery Protection (Set By Commissioning Engineer)
Battery low pre-warning
The battery low pre-warning occurs before the EOD. After this pre-warning, the battery should have the capacity for
three remaining minutes discharging with full load. The time can be configured from 3min to 60min.
EOD protection
When the battery voltage drops to the EOD voltage, the battery converter shuts down. The EOD voltage is adjustable
from 1.6V/cell to 1.75V/cell (VRLA).
Battery disconnect device alarm
The battery disconnect device alarm occurs when the battery disconnect device disconnects.
The external battery connects to the UPS through the external BCB. The BCB is manually closed and tripped by the
UPS control circuit.