Redundant Control Power Supply Board; Socket Outlet; Multi Module Ups-1+N; Figure 30 Typical 1+N Multi-Module Ups With Optional External Maintenance Bypass Switch - Emerson Liebert NX User Manual

Operation
5.1.4

Redundant Control Power Supply Board

The UPS is equipped with two identical and fully redundant control power supply boards. Each of
them takes inputs from the AC and DC sources. When one of the sources or even if one of the control
power boards fails, the UPS system can still operate normally. This feature further enhances the reli-
ability of the system.
5.1.5

Socket Outlet

One single-phase Shuko-type universal outlet of 3A current handling capability provides nominal
UPS output voltage of up to 3A current capacity for the ease of testing, commissioning & servicing of
the UPS.
5.2 Multi Module UPS—1+N
Multi-module UPS are formed by several "single unit" UPS modules to constitute "1+N"system where
groups of one or more, up to six, single units operate together for the purpose of providing additional
power or reliability or both. The load is equally shared between any paralleled UPS.
Figure 30 Typical 1+N multi-module UPS with optional external maintenance bypass switch distribution
panel
Qin UPS1
Supplied by Others
Input Mains Supply
L1,L2,L3,N
CB1
RECTIFIER
STATIC
SWITCH
INVERTER
OUTPUT
L, N
Qout UPS1
Qout all UPS
Further, single unit or 1+N groups may be configured as "distributed redundant" systems with inde-
pendent outputs that nevertheless are synchronised through a Load Bus Synchroniser (LBS) so that
critical loads can be seamlessly transferred from one system to another. See 5.3 - Modes of Opera-
tion for more information.
Input Mains Supply
Bypass Mains Supply
L1,L2,L3,N
L, N
UPS1
Distribution Cabinet
Qin UPS2
Input Mains Supply
Bypass Mains Supply
L, N
CB1
RECTIFIER
STATIC
SWITCH
INVERTER
UPS2
OUTPUT
L, N
Qout UPS2
40
Qin UPS3
L1,L2,L3,N
CB1
RECTIFIER
STATIC
SWITCH
INVERTER
UPS3
OUTPUT
L, N
Qout UPS3
Qout Byp
Qin Ext
Byp
L, N