Liebert NX 30 User Manual

22 User Manual 10H52192UM60 - Rev. 1 - 09/2011
Liebert NX Battery
Chapter 2 Battery
This chapter provides relevant information about the battery, including a short introduction, and information on battery safety,
battery power cables, battery maintenance and recycling, and the reference current.
2.1 Brief Introduction
The UPS battery string consists of batteries connected in series in order to supply the rated DC input voltage for the UPS inverter.
The battery backup time (that is, the time that the battery can continue to supply the load for when the mains supply is interrupted)
depends on the ampere-hour capacity of the batteries. Therefore, it may be necessary to connect several battery strings in parallel.
The NX UPS includes a battery compartment that can accommodate the internal batteries.
In the case of UPS configurations without internal batteries, the unit must be connected to an external battery cabinet. The external
battery is fitted with a protective device that can be used to isolate the battery in the event of maintenance work. This device is
mounted inside or in close proximity to the battery cabinet.
Note
1. The external battery cabinet for the UPS can hold up to 64 12 V batteries.
2. It must be possible to disconnect the battery from the UPS when carrying out maintenance or service work. The fuse holder can be
switched on or off manually.
3. The requirements of the EC directives are satisfied when battery cabinets are used with original accessories. If alternative batteries
are used, you must ensure that the applicable EC directives are met, and declare conformity.
2.2 Safety
Take special care when working with the batteries associated with the UPS. When all the blocks are connected together, the battery
string voltage can be up to 576 Vdc. This is potentially lethal. Please follow the precautions for high voltage operation. Only
qualified personnel are allowed to install and maintain the battery. To ensure safety, the external batteries are to be installed inside
a lockable cabinet or in a purpose-designed, dedicated battery room, so that they are only accessible to qualified maintenance
personnel.
During battery maintenance, pay attention to the following items:
 Ensure that the UPS is in maintenance mode.
 The battery cell number setting in the background software must be consistent with the actual battery cell number.
 If the battery fuses are blown, the UPS must be repaired by authorized service personnel. The fuses must be replaced
using the same type as those that were delivered with the UPS and must be supplied by the same manufacturer.
Note
Full safety instructions concerning the use and maintenance of UPS batteries are provided in the appropriate battery manufacturers’
manuals. The battery safety information contained in this section relates to key considerations that must be taken into account during
the installation design process and might affect the design outcome depending on localized conditions.
Warning: Hazardous battery voltage present behind covers
1. No user-serviceable parts are located behind covers that require a tool for their removal. Only qualified service personnel are
authorized to remove such covers.
2. Before working on the copper bars connected to the external battery, please ensure they are disconnected from all power supplies.
3. Observe the following safety precautions when working on the batteries:
1) The battery must be firmly and reliably connected. After the connection is completed, all connections between the terminals and
the batteries must be calibrated. The requirements for torque specified in the instructions or user manual provided by the battery
manufacturer must be satisfied. All connections between the terminals and the batteries must be inspected and tightened at least
once a year. Failure to observe this may result in fire!
2) Inspect the battery appearance before accepting and using the battery. If there is any damage to the packaging, dirty battery
terminals, terminal erosion, rust, or cracks in the enclosures, deformation or electrolyte leakage, replace it with a new product. Failure
to do so may result in battery capacity reduction, electrolyte leakage, or fire.
3) Batteries are very heavy. Please use the proper method when moving and lifting batteries to prevent any injuries or damage to the
battery terminals. Severely damaged batteries may catch fire.
4) The battery terminals must not be subject to any force, such as the pulling force or twisting force exerted by cables. This may
damage the internal connection of the battery and severe damage may result in fires.

Liebert NX 30 Specifications

General

Brand	Liebert
Model	NX 30
Category	Power Supply
Language	English