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UPS Multi-Module Installation
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3.2 Paralleled UPS Modules
The basic installation procedure of a parallel system comprising two or more UPS modules is the
same as that of single module system. The following sections only introduce the installation proce-
dures specific to the parallel system.
3.2.1 Cabinet Installation
Place the UPS modules side by side and interconnect as shown in Figure 14. The distribution panel
(external bypass cabinet) is optional but recommended for ease of maintenance and system testing.
Figure 14 Typical 1+N system block diagram with common input supply, with separate batteries and
optional output / bypass distribution panel
Distribution Cabinet
TO LOAD
QUPS
Q1EXT
SW1-A
SW1-D
INVERTER
BATTERY 1
FUSES
CHARGER
UPS1
SUPPLIED BY OTHERS
INPUT MAINS
SUPPLY L1, L2, L3, N
L1, L2, L3, N L1, L2, L3, N
SUPPLY L1, L2, L3, N
CB1
RECTIFER
SW1-C
STATIC
SWITCH
BATTERY 2
FUSES
CHARGER
UPS2
INPUT MAINS
CB1
RECTIFER
SW1-C
STATIC
SWITCH
INVERTER
SW1-A
Q2EXT
QBYP