Liebert Emerson NX UPS System - Manual (Page 25)

Battery Installation
17
2.0 B
ATTERY
I
NSTALLATION
2.1 Introduction
The UPS battery bank consists of battery blocks connected in series to provide a D.C. string voltage as
required by the UPS converter. The 'AUTONOMY TIME' (the time during which the battery can
maintain supply to the load in the event of a mains failure) is limited by the ampere-hour capacity of
the battery blocks and in some cases this results in several strings being connected in parallel.
The NX usually has internal batteries, but longer run time is available by using an external battery
cabinet.
The battery cabinet will be supplied in one of the following forms:
1. Complete installation, comprising the battery cabinet, batteries and protective device.
2. Battery cabinets and protective device only—batteries supplied by others
The battery bank may be disconnected from the UPS for maintenance or service.
NOTE
10kVA to 30kVA UPS models contain an internal battery compartment that can accommodate
up to 44 blocks of batteries for 12Ah/12V; 80 blocks of batteries for 7.2Ah/12V