Emerson Liebert NX User Manual download pdf (Page 35)

UPS Multi-Module Installation

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

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Emerson Liebert NX User Manual Page 35

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