Emerson 250 Manuel D’Utilisation

This manual contains important instructions that should be followed during installation of your 

Liebert NXL

™

 UPS.Read this manual thoroughly, paying special attention to the sections that apply 

to your installation, before working with the UPS. Retain this manual for use by installing per-

Risk of electrical shock. Can cause personal injury or death.
This UPS has several circuits that are energized with high DC as well as AC voltages. Check 

for voltage with both AC and DC voltmeters before working within the UPS. Check for voltage 

with both AC and DC voltmeters before making contact.
Only properly trained and qualified personnel wearing appropriate safety headgear, gloves, 

shoes and glasses should be involved in installing the UPS or preparing the UPS for 

installation. When performing maintenance with any part of the equipment under power, 

service personnel and test equipment should be standing on rubber mats.
In case of fire involving electrical equipment, use only carbon dioxide fire extinguishers or 

those approved for use in fighting electrical fires.
Extreme caution is required when performing installation and maintenance.
Special safety precautions are required for procedures involving handling, installation and 

maintenance of the UPS system. Observe all safety precautions in this manual before 

handling or installing the UPS system. Observe all precautions in the Operation and 

Maintenance Manual, SL-25425, before as well as during performance of all maintenance 

procedures. Observe all DC safety precautions before working on or near the DC system.

Risk of heavy unit falling over. Improper handling can cause equipment damage, injury or 

death.
Exercise extreme care when handling UPS cabinets to avoid equipment damage or injury to 

personnel. The UPS module weight ranges from 3965 to 5250lb (1768 to 2381kg).
Locate center of gravity symbols

 and determine unit weight before handling each 

cabinet. Test lift and balance the cabinets before transporting. Maintain minimum tilt from 

vertical at all times.
Slots at the base of the modules cabinets are intended for forklift use. Base slots will support 

the unit only if the forks are completely beneath the unit.
Read all of the following instructions before attempting to move, lift, remove packaging from 

or preparing unit for installation.

Risk of electrical shock and fire. Can cause equipment damage, personal injury or death.
Under typical operation and with all UPS doors closed, only normal safety precautions are 

necessary. The area around the UPS system should be kept free of puddles of water, excess 

moisture and debris.
Only test equipment designed for troubleshooting should be used. This is particularly true for 

oscilloscopes. Always check with an AC and DC voltmeter to ensure safety before making 

contact or using tools. Even when the power is turned Off, dangerously high potential electric 

charges may exist at the capacitor banks and at the DC connections.
All wiring must be installed by a properly trained and qualified electrician. All power and 

control wiring must comply with all applicable national, state and local codes.
One person should never work alone, even if all power is disconnected from the equipment. A 

second person should be standing by to assist and to summon help in case of an accident.