Filter
Top Products
Specifications
Liebert
®
NX
™
38
5.0 SPECIFICATIONS
5.1 DC Sources
5.1.1 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 240-cell battery, the DC bus nominal float voltage range is 2.15 to 2.30VPC.
Maximum equalize voltage is 2.45VPC. Battery voltage at end of discharge is 1.65VPC at the UPS
terminals. The number of battery cells required ranges from 228 to 246, depending on the application.
5.2 Other DC Sources
The separate DC source manufacturer’s manual, available on the manufacturer’s Web site, provides
the necessary information for the installation, operation and maintenance of the DC source. Use the
DC source manual in conjunction with this manual.
5.3 Environmental Conditions
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 104°F (40°C). However, design equipment
life expectancy will be extended with lower temperatures (77°F [25°C] is recommended).
3. Ambient temperature is the maximum ambient temperature during any 24-hour period. For
operation at higher temperatures, consult your Emerson
®
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 Emerson sales representative or call Liebert
Services at 1-800-LIEBERT.
Table 7 Environmental specifications
Parameter Specification
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)
32 (0)
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, ft, (m) Sea level to 3000 (1000) without derating
Storage Elevation, ft, (m) Sea level to 50,000 (15,240)
Audible Noise, 5ft (1.5m)
from Unit
68 dBA, typical