7.3 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 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. Batteries must be fully charged before they can be discharged. 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.
7.4 Precautions for Installation Design
N O T E: P recautions fo r installation, u sage and m aintenance of the b attery are described in the
relevant battery m anual provided by th e battery m anufacturer. T he safety precautions described in
this section include the im portant m atters that m ust be considered during the installation design.
The design results m ay b e chang ed accord ing to the local situations.
UPS are supplied without the battery switch. It is mandatory that the Customer provides an external battery protection device,
ensuring that they are correctly rated.
Auxiliary signal contacts shall be assigned to a programmable input, so that the status of the switch can be monitored during
the normal operation.
W A RN IN G! The U PS ground lu g m ust be solidly connected to the service entrance ground by
an appropriately sized w ire con d u ctor p er the IE C 60364-5-54. Each conduit or raceway
containing phase conductors m ust also contain a ground wire, both for UPS input and output,
w hich are solidly connected to the ground term inal at each term ination p oint
7 Battery
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Vertiv™ Liebert® EXM2 UPS User Manual
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