Liebert 130 kVA - Manual (Page 67)

User Manual
Hipulse - Single Phase ‘1+N’ UPS System 130 kVA - 110V
47
CHAPTER 6
Battery Installation
6.1 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
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 it could mean
several strings are connected in parallel.
Usually, with UPS installations in the power range covered by the ‘Hipulse’ equipment,
the batteries are contained in a purpose built battery cabinet which sits alongside the
main UPS and the Battery Circuit Breaker Controller Board ( for all sizes).
The battery cabinet can be installed in one of the following forms:
Complete installation comprising the battery cabinet, batteries and the circuit breaker.
Battery cabinets and battery circuit breaker - with no batteries.
Battery cabinet only – with no batteries or circuit breaker.
It is possible to install batteries of various types and capacity in the cabinet to obtain
he required autonomy characteristics.
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 off manually ON or OFF, but should also
contain an under voltage release mechanism (to be energized by the UPS control
electronics) and a magnetic trip facility for overload protection which is used in
conjunction with battery circuit breaker controller module.
If multiple sets of batteries connected in parallel are used to increase battery
autonomy, the extension must be fitted with a sectioning device to permit work to be
performed on one set of batteries wile the others remain in service.
For external battery assembly, a customized Battery Circuit Breaker (the features of
which depend on the sizes of the UPS) including a Battery Circuit Controller Board
(the same for all sizes) can be provided. 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 6.9 for more information.
A common battery circuit breaker is available for systems incorporating two parallel
UPS with a common battery. It comprises two switches, which may be used to
section one UPS while the other remains active. Refer to section 8.3 for more
information.
6.2 Safety
Special care should be taken while working on batteries associated with Hi-pulse UPS
system equipment. When all the cells are connected together, the battery terminal
voltage will exceed 400 V DC and is potentially lethal. A primary safety consideration
is to physically isolate the battery installation from all but appropriately qualified
maintenance personnel, which is best achieved by locating in a key locatable cabinet
or a purpose designed, dedicated battery room.