Emerson Liebert NX User Manual download pdf (Page 49)

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 29 1+N multi-module UPS with external maintenance bypass switch

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.

CB1

UPS1

OUTPUT

Qout all UPS

Qout UPS1 Qout UPS2

Qout Byp

Qin Ext

Byp

Qin UPS2

Qin UPS3

Qin UPS1

Qout UPS3

RECTIFIER

STATIC

SWITCH

INVERTER

L1,L2,L3,N

L1,L2,L3,N L1,L2,L3,N

L1,L2,L3,N

Supplied by Others

Input Mains Supply Input Mains Supply Input Mains Supply

Bypass Mains Supply

Distribution Cabinet

Bypass Mains Supply

CB1

UPS2

OUTPUT

RECTIFIER

STATIC

SWITCH

INVERTER

CB1

UPS3

OUTPUT

RECTIFIER

STATIC

SWITCH

INVERTER

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Emerson Liebert NX User Manual Page 49

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