Installation Manual Liebert Hipulse E Chapter 3 – Battery Installation
Single or '1+N' UPS System
(07/04) Page 3-1
3 Chapter 3 - Battery Installation
3.1 Introduction
The UPS battery consists of battery blocks connected in series to provide a nominal d.c. input voltage for the UPS
inverter. The required ‘AUTONOMY TIME’ (the time that the battery can maintain supply to the load in the event of a
mains failure) is limited by the ampere hour size of the individual battery blocks and in some cases this could mean
several strings are connected in parallel.
Usually, with UPS installations in the high power range covered by the 'Hipulse' equipment, the batteries are contained
in a dedicated battery room. It must be possible to install batteries of various types and capacity in the battery room to
obtain the required autonomy characteristics.
If multiple sets of batteries connected in parallel are used to provide the required battery autonomy, each set should be
fitted with an isolating devices to permit work to be performed on one set of batteries while the others remain in
service.
It must be possible to disconnect the battery from the UPS module when undertaking maintenance or service
procedures. This is facilitated by means of a suitably rated circuit breaker which must be located as close as possible to
the battery terminals, and the power and control cables connected to the UPS using the most direct route possible. The
circuit breaker can be switched manually ON or OFF but should also contains an under-voltage release mechanism
(having a variable trip setting) which is used in conjunction with battery circuit breaker controller board.
For battery room assembly, Liebert offers a battery circuit breaker option (the rating of which depends on the size of the
UPS) including a battery circuit breaker controller board (the same for all sizes). This box is designed to be either wall-
mounted or assembled on a frame, and is connected between the UPS and the battery. Refer to section 3.8 for more
information.
A Common Battery Circuit Breaker is available for systems incorporating two parallel UPSs with a common battery. It
comprises two switches, which may be used to section one UPS while the other remains active. Refer to section 4.3 for
more information.
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