Vertiv EXM 0080kTK16FN01000 User Manual Download

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88 Chapter 6 Battery

Liebert EXM 80kVA ~ 200kVA UPS User Manual

Warning: hazardous battery voltage present behind covers

i) Clean the battery enclosure with the 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.
j) The battery has diluted sulfuric acid. In normal use, the diluted sulfuric acid will be absorbed to the baffle and
polar plate of the battery. However, if the battery is damaged, the acid may leak from the battery. Therefore,
personal protective equipment (e.g., protective glasses, rubber gloves and apron) must be used 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.
k) The battery may have short circuit, electrolyte dry-up or positive pole erosion failure at the end of its life. If it is
still used under this state, the battery may have thermorunaway, bulging or liquid leakage. Please replace the
battery before it becomes this state.
l) Before connecting or disconnecting the battery connection cables, please isolate the charging power.
m) Check if the battery has been unexpectedly earthed. If this is the case, remove the earth connection. Contact
with any part of the earthed battery may result in an electric shock.

6.3

UPS Battery

The UPS 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

6.13 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.