62 Chapter 6 Battery
NX UPS Single Module And Parallel System 250kVA ~ 800kVA User Manual
Warning: hazardous battery voltage present behind protective covers
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.
6.3 UPS Battery
The UPS battery generally adopts valve-regulated battery. At present, “valve-regulated” means the “sealed type” or
“maintenance free” mentioned in the past.
The valve-regulated battery is not completely sealed. Especially when it is over-charged, there will be gas escape.
The volume of the gas escape is less than the water injection battery. However, during the installation design of the
battery, temperature rise shall be taken into account, and enough room shall be reserved to ensure good ventilation.
Besides, the valve-regulated battery is not maintenance free. The valve-regulated battery must be kept clean, and it
shall be inspected regularly to check if the connection is reliable, and if it is corroded. For details, please refer to
6.12 Battery Maintenance
.
It is suggested to connect no more than 4 strings of batteries in parallel. Batteries of different types, names or
newness shall not be used together. Otherwise, the battery inconsistency will cause frequent over-discharge or
under-charge of certain battery. At last, the battery will have premature failure, and the entire string of battery will
have insufficient backup time.
The battery must be stored in fully charged state. The battery will lose certain capacity because of self discharge
during the transportation or storage. Charge the battery before use. During the storage, ensure that the ambient
temperature shall not exceed the range of -15°C ~+45°C, and the optimal temperature is 20°C ~25°C. To
compensate for the self discharge of the battery during the storage. The battery shall be charged every 3 months
during the storage. The specific time may differ for different batteries. For details, refer to the requirement of the
battery manufacturer.
It is very important to fully charge the battery before carrying out onsite test on the battery backup time. The test may
take several days. Therefore, it should be conducted after the battery has been subject to uninterrupted float charging
for at least one week.
When the battery has been running for several weeks or subject to two to three charge and discharge cycles, the
battery performance will be increased.
To avoid the battery over-charge or under-charge, please set the battery management parameters according to the
equalizing/float charge voltage and temperature compensation factor specified in the manuals provided by the battery
manufacturer. Please charge the battery immediately after discharge.