7 Battery
This chapter introduces the battery, including the battery safety, installation and maintenance information, battery protection
function, as well as the connection of BCB box (option), battery temperature sensor (option), and battery ground fault
detector (option).
7.1 Introduction
The UPS battery string is composed of several batteries in series connection and provides rated DC input voltage for the UPS
inverter. The required battery backup time (i.e. the time for battery to supply load upon mains failure) is subject to the
ampere-hour value of the battery. Sometimes, it is necessary to connect several strings of battery in parallel.
To facilitate the UPS installation, the battery is generally installed on the specially designed battery rack or in the battery
room.
During the maintenance or repair, the battery must be disconnected from the UPS. This operation may be realized by the
battery circuit breaker of proper capacity. This circuit breaker shall be located as close as possible to the battery connecting
terminal, and the wiring distance of the power and signal cables connected to the UPS shall be minimized.
When several strings of battery are paralleled to increase the battery backup time, disconnecting device shall be equipped, so
that the maintenance operation on a certain battery string will not affect the normal operation of other battery strings.
7.2 Safety
Take special care when working with the batteries associated with the UPS. When all the blocks are connected, the battery
string voltage can be up to 540Vdc. This is potentially lethal. Please follow the precautions for high voltage operation. Only
qualified personnel are allowed to install and maintain the battery. To ensure safety, the external batteries are to be installed
inside a lockable cabinet or in a purpose-designed, dedicated battery room, so that they are only accessible to qualified
service personnel.
Confirm that the battery switch has been disconnected before battery maintenance.
H aza rdous battery v oltage pre sent b ehind covers
1. No user-serviceable parts are located behind covers that require a tool for their removal. Only qualified service personnel are authorized to
remove such covers.
2. Before working on the copper bars connected to the external battery, please ensure they are disconnected from all power supplies.
Prop er co nnection m ode Im p roper c on nectio n m ode
Tighten the terminal bolt of the battery with specified
torque
Too large or too small torque may cause poor connection of the terminal. Under certain
conditions, the terminal may have arcing or heat accumulation, which finally will cause fire
7 Battery
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Vertiv™ Liebert® EXM2 UPS User Manual
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