36 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Operation
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 may be set to any value between 1.6 V/cell and 1.75 V/cell (VRLA) or
0.9 V/cell and 1.1 V/cell (NiCd).
6. 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.
4.4.2 Advanced Function
The UPS provides an advanced function, battery maintenance test. At regular intervals, 20% of the rated capacity of the battery will
be discharged automatically, providing the current load exceeds 20% of the rated UPS (kVA) capacity. If the load is less than 20%,
the automatic discharge cannot be performed. The interval can be set to between 30 and 360 days. The battery self-test can be
disabled.
Conditions: battery on float charge for at least 5 h, load equal to 20% to 80% of rated UPS capacity.
Trigger: Manually by the Battery Maintenance Test command on the LCD or automatically.
Battery maintenance interval: 30 to 360 days (default setting: 60 days).
4.5 Battery Protection (Set Up by Commissioning Engineer)
Battery Low Pre-warning
The battery low pre-warning occurs before the EOD. After this pre-warning, the battery should be able to supply the full load for
another three minutes at the current discharge rate. The time can be configured to between 3 min and 60 min.
EOD Protection
When the battery voltage drops to the EOD voltage, the battery converter shuts down. The EOD voltage may be set to any value
between 1.6 V/cell and 1.75 V/cell (VRLA) or
0.9 V/cell and 1.1 V/cell (NiCd).
Battery Disconnect Device Alarm
The battery disconnect device alarm occurs when the battery disconnect device is tripped.
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