Emerson 10-30kVA Manuel D’Utilisation

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

Liebert NX™ UPS and batteries.
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 personnel.

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

personnel. The UPS module weight ranges from 850 to 1400 lb. (386 to 635kg).
Determine unit weight and locate center of gravity symbols

before handling the UPS. Test lift and balance the cabinet

before transporting. Never tilt equipment more than 15 degrees from vertical.
Battery manufacturers supply details of the necessary precautions to be observed when 

working on, or in the vicinity of, a large bank of battery cells. These precautions should be 

followed implicitly at all times.
Follow all battery safety precautions when installing, charging or servicing batteries. In 

addition to the hazard of electric shock, gas produced by batteries can be explosive and 

sulfuric acid can cause severe burns. When connected, the nominal battery voltage is 288VDC 

and is potentially lethal.
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 maintenance.
Be constantly aware that the UPS system contains high DC as well as AC voltages.
Check for voltage with both AC and DC voltmeters prior to making contact.

As with other types of high power equipment, dangerous voltages are present within the UPS 

and battery enclosure. The risk of contact with these voltages is minimized as the live 

component parts are housed behind a hinged, lockable door. Further internal safety screens 

make the equipment protected to IP20 standards.
No risk exists to any personnel when operating the equipment in the normal manner, 

following the recommended operating procedures.
All equipment maintenance and servicing procedures involve internal access and should be 

carried out only by trained personnel.

High ground leakage current: Ground connection is essential before connecting the input 

supply.
This equipment must be grounded in accordance with local electrical codes. 
Maximum load must not exceed that shown on the UPS rating label.