Emerson 480V Manuel D’Utilisation

Batteries must be installed in Liebert NX 480V battery cabinets or battery room. Temperature is a 

major factor in determining battery life and capacity. Battery manufacturers recommend an operat-

ing temperature of 77°F (25°C). Ambient temperatures higher than this reduce battery life; tempera-

tures lower than this reduce battery capacity. In a typical installation, battery temperature should be 

maintained between 74°F and 80°F (23-27°C). Batteries should be placed where there are no main 

heat sources or air inlets to prevent portions of batteries from being either much warmer or much 

cooler than other parts of the batteries.

1. Consider the grounding configuration of your system before finalizing module placement. For 

optimal ground performance, the Liebert NX modules should be close together.

2. For optimal load-sharing performance, the UPS output cables should be approximately the same 

length, plus or minus 20 percent.

3. Position modules in such a way as to minimize the length of power cables and control wiring 

between UPS modules and the paralleling cabinet.

Ensure that the UPS weight is within the designated surface weight loading (lb./ft

2

 or kg/cm

2

) of any 

handling equipment. See Table 7 for weights of various units.
To move the UPS and optional battery cabinets:

• The Liebert NX may be rolled on its casters when moving the unit a short distance. For longer dis-

tances, move the UPS with a forklift or similar equipment to ease the relocation and to reduce 

vibration.

The optional battery cabinets should be moved with a forklift or similar equipment.

When the equipment has been finally positioned, ensure that the adjustable stops are set so that the 

UPS will remain stationary and stable (see 6.0 - Installation Drawings).

The Liebert NX is constructed with a steel frame and removable panels. Top and side panels are 

secured to the chassis by screws. The doors may be opened for access to power connections bars, aux-

iliary terminal blocks and power switches.
The UPS comes with an operator control panel, which provides basic operational status and alarm 

information. Cooling is provided by internal fans. The unit sits on four casters. Adjustable stops are 

provided to prevent the UPS from moving once it has been moved to its final position.

Ensure that any equipment that will be used to move the Liebert NX has sufficient lifting 

capacity. The Liebert NX weight ranges from 1180 to 2201 lb. (535 to 1000kg). See Table 7 for 

details. The UPS presents a tipping hazard. Do not tilt the Liebert NX further than 15 

degrees from vertical.
The UPS is fitted with casters—take care to prevent movement when unbolting the 

equipment from its shipping pallet. Ensure adequate personnel and lifting equipment are 

available when taking the Liebert NX off its shipping pallet. Do not tilt the unit more than 15 

degrees from center.

The casters are strong enough for movement across even surfaces only. Casters may fail if 

they are subjected to shock loading, such as being dropped or rolled over holes in the floor or 

obstructions. Such failure may cause the unit to tip over, injuring personnel and damaging 

the equipment.
Care must be taken when maneuvering cabinets fitted with batteries. Keep such moves to a 

minimum. For further information, see Battery Cabinet Precautions on page 2.