Chapter 6 Battery 61
NX UPS Single Module And Parallel System 250kVA ~ 800kVA User Manual
Chapter 6 Battery
This chapter introduces the relevant information of the battery, including the battery safety, installation and
maintenance information, battery protection function, BCB box, battery temperature sensor and battery ground fault
detector.
6.1 Introduction
The UPS battery string consists of batteries connected in series to provide rated DC input voltage for the UPS
inverter. The battery backup time (that is, the lasting time for the battery to supply the load during mains failure) is
subject to the ampere-hour capacity of the batteries. Therefore, it may be necessary to parallel-connect several
(advisably, not more than four) battery strings. Batteries of different types, names or used time cannot be used
together.
Note
It shall be possible to disconnect the battery from the UPS when undertaking maintenance or service procedures. The BCB can
be switched manually on or off.
6.2 Safety
Take special care when working with the batteries associated with the UPS. When all the cells are connected together,
the battery string voltage can be up to 576Vdc and is potentially lethal. Please follow the precautions for high voltage
operation. Only qualified personnel are allowed to install and maintain the battery. To ensure the safety, the external
batteries shall be installed inside a key-lockable cabinet or in a purpose-designed, dedicated battery room, so that
they are segregated from all but qualified maintenance personnel.
Before battery maintenance, make sure that the BCB is off.
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 protective covers
1. No user-serviceable parts are located behind protective covers that require a tool for their removal. Only qualified service
personnel are authorised to remove such covers.
2. Before operating the copper bars connected with the external battery, please disenergize the copper bars.
3. Observe the following safety precautions when working on the batteries:
1) The battery shall be firmly and reliably connected. After the connection is completed, all connections between the terminals and
the batteries shall be calibrated. The requirements on torque specified in the instructions or user manual provided by the battery
manufacturer shall be satisfied. All connections between the terminals and the batteries shall be inspected and tightened at least
once a year. Failure to observe this may cause fire!
2) Inspect the battery appearance before accepting and using the battery. If there exists any package damage, dirty battery
terminal, terminal erosion, rust, or enclosure crack, deformation or electrolyte leakage, replace it with new product. Otherwise,
battery capacity reduction, electrolyte leakage or fire may be caused.
3) The battery is very heavy. Please use proper method to move and hoist the battery, so as to prevent any damage to human
being or the battery terminals. Severe damage to the battery may cause fire.
4) The battery terminals shall not be subject to any force, such as the pulling force or twisting force of the cable. Otherwise, the
internal connection of the battery may be damaged, and severe damage may cause fire.
5) The battery shall be installed and stored in a clean, cool and dry environment. Do not install the battery in a sealed battery
chamber or a sealed room. The battery room ventilation shall at least meet the requirement of EN50272-2001. Otherwise, battery
bulging, fire or even personal may be caused.
6) The battery shall be kept away from heat sources like transformers, or fire sources. Do not burn the battery or the battery in fire,