Emerson Liebert NXr, User Manual

Chapter 2  Battery      17 

NXr UPS Module And Parallel System 30kVA ~ 200kVA    User Manual 

2.2   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. 

During battery maintenance, pay attention to the following items:   



 Place the maintenance switch in the ON position 



 The battery cell number setting in the background software must be consistent with the actual battery cell 

number 

Note 

Full safety instructions concerning the use and maintenance of UPS batteries are provided in the appropriate battery 
manufacturers manuals. The battery safety inforamtion 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 localised 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 
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 exist 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, 
otherwise, electrolyte leakage, battery bulge, fire or explosion may be caused. 

7) Do not directly connect any conductor between the positive and negative terminals of the battery. Remove finger rings, 
watches, necklaces, bracelets and other metal objects before operating the battery, and ensure that the tools (for example, 
wrench) are wrapped with insulating material. Otherwise, battery burning, explosion, human death or injury may be caused. 

8) Do not disassemble, modify or damage the battery. Otherwise, battery short circuit, electrolyte leakage or even personal may 
be caused. 

9) Clean the battery enclosure with wringed wet cloth. To avoid any static or arcing, do not use dry cloth or duster to clean the 
battery. Do not use the organic solvent, such as thinner, gasoline, 

volatile oil

, to clean the battery. Otherwise, the battery enclosure 

may be cracked. In worst case, fire may be caused. 

10) The battery contains diluted sulfuric acid. In normal use, the diluted sulfuric acid is absorbed to the baffle plate and polar plate 
of the battery. However, if the battery is damaged, the acid may leak from the battery. Therefore, use personal protective 
equipment, such as, goggles, rubber gloves and apron, when operating the battery. Otherwise, if the diluted sulfuric acid enters 
the eyes, blindness may be caused; if it contacts the skin, the skin may be burnt. 

11) The battery may have short circuit, electrolyte dry-up or positive-pole plate erosion at the end of its life. If it is still used in this 
state, the battery thermorunaway, bulging or electrolyte leakage may occur. Please replace the battery before it enters this state. 

12) Before connecting or disconnecting the battery connection cables, please cut off the charging power. 

13) Check if the battery has been unexpectedly earthed. If yes, remove the earth power. Contact with any part of the earthed 
battery may cause electric shock.