86 Chapter 6 Battery
Liebert EXM 80kVA ~ 200kVA UPS User Manual
Chapter 6
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).
6.1
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.
6.2
Safety
Take special care when working with the batteries associated with the UPS. When all the blocks are
connected together, 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.
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 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.
Proper connection mode
Improper connection mode
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
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