Emerson 250-400kVA Manuel D’Utilisation

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 man-

ual, available on the manufacturer’s Web site, for information about your system.
For models with nominal 240-cell battery, the DC bus nominal float voltage range is 527 to 561VDC. 

Maximum equalize voltage is 585VDC. Battery voltage at end of discharge is 386VDC at the UPS ter-

minals (389VDC at the battery). The number of battery cells required will range from 236 to 244, 

depending on the application.

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 104°F (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, consult your Liebert sales representative or call Liebert 

Services at 1-800-LIEBERT.

4. Exercise care during installation to ensure unimpeded airflow through the UPS.
5. For operation at higher elevations, consult your Liebert sales representative or call Liebert 

Services at 1-800-LIEBERT.

Enclosure

The UPS is housed in a NEMA-1 enclosure. The enclosure is designed for indoor 

use only and is not to be subjected to falling objects or precipitation.

Recommended Operating

Temperature, °F (°C)

77 (25) ambient

Maximum Operating

Temperature, °F (°C)

104 (40) ambient (design temperature) without derating; (see Notes 2 and 3).

Minimum Operating

Temperature, °F (°C)

0°C

Storage Temperature, °F (°C)

-13 to 158 (-25 to 70) 

Typical Battery

Temperature Requirements

Average annual temperature must not exceed 80°F (27°C). Peak temperature 

must not exceed 109°F (43°C). See battery manufacturer’s recommendations.

Relative Humidity

0 to 95% without condensation

Operating Elevation

Sea level to 4900 ft. (1500m) without derating

Storage Elevation

Sea level to 50,000 ft. (15,240m)

Audible Noise,

5 Feet (1.5m) from Unit

68 dBA typical