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Liebert NXL UPS
4 SPECIFICATIONS
4.1 Battery Operation
The separate battery manufacturer's manual, available on the manufacturer's Web site,
provides the necessary information for the installation, operation and maintenance of the
battery. Use the battery manual in conjunction with this manual.
The float charge voltage for a battery is equal to the number of cells in series making up the
battery multiplied by the charge voltage for each cell.
Because the charging voltage level is critical to proper battery operation, refer to your
battery manual, available on the manufacturer's Web site, for information about your
system.
For models with nominal 198-cell battery, the DC bus nominal float voltage range is 425 to
460VDC (516 to 552VDC @ 240 cells).
Maximum equalize voltage is 485VDC (581VDC @ 240 cells). Battery voltage at end of
discharge is 327VDC at the UPS terminals (396VDC @ 240 cells). The number of battery
cells required will range from 192 to 204 (250-300-400kVA), depending on the application.
4.2 Environmental Conditions
Liebert NXL Model Size
Parameter
Enclosure
Recommended Operating
Temperature (°C)
Maximum Operating
Temperature (°C)
Minimum Operating
Temperature (°C)
Storage Temperature
(° C)
Typical Battery
Temperature
Requirements
Relative Humidity
Operating Elevation
Storage Elevation
Audible Noise(1.5m) from
Unit
Table 3: Environmental specifications (250-300-400kVA UPS)
Notes on Environmental Specifications
1. This category of electronic equipment is agency rated for use in an atmosphere free of
conductive particles. Some industrial facilities may require a room air filtration system
to keep the UPS free of excess moisture and contaminants.
2. The UPS system is designed to operate continuously at 40°C. However, design
equipment life expectancy will be extended with lower temperatures (25°C is
recommended).
3. Ambient temperature is the maximum ambient temperature during any 24-hour period.
For operation at higher temperatures or elevations, consult Liebert Global Services
Support.
4. Exercise care during installation to ensure unimpeded airflow through the UPS.
Page 65
Operation and Maintenance Manual
Specification
The UPS is housed in a IP20 enclosure. The enclosure is designed for
indoor use only and is not to be subjected to falling objects or precipitation.
25 ambient
(40) ambient (design temperature) without derating; (see Notes 2 and 3).
0° C
-25 to 70
Average annual temperature must not exceed 27° C. Peak temperature
must not exceed 43° C. See battery manufacturer's recommendations.
0 to 95% without condensation
Sea level to 1500m without derating
Sea level to 15.000m
≤69 dBA
250-300-400-800kVA
250-300-400 kVA
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