Paralleled Ups Modules; Cabinet Installation; Figure 29 Typical 1+N System Block Diagram With Common Input Supply, With Separate Batteries - Emerson Liebert NX 400V User Manual

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 29. The distribution panel
(external bypass cabinet) is optional but recommended for ease of maintenance and system testing.
Figure 29 Typical 1+N system block diagram with common input supply, with separate batteries and
optional output / bypass distribution panel
Supplied
by Others
Input Mains
Supply L1, L2, L3, N
UPS1
Charger
NOTE
Internal maintenance bypass switch Q3 must be removed when the load exceeds the capacity of
one UPS module.
Q1
Rectifier
Inverter
Q2
Q3
Q5
L1, L2, L3, N
Q1EXT
QUPS
Distribution Cabinet
To Load
Input Mains
Supply L1, L2, L3, N
UPS2
Charger
Q5
L1, L2, L3, N
Q2EXT
46
UPS Multi-Module Installation
Q1
Rectifier
Inverter
Q2
Q3
QBYP