Emerson 40-200KVA Mode D'Emploi

The Liebert

®

 NX

™

 uses intelligent and reliable decentralized technology to achieve parallel operation 

of two or more modules.
The parallel system is used to:

• Increase the reliability of the system to ensure adequate power supply to the critical load con-

nected.

• Increase serviceability and allow the execution of maintenance operations and repairs without 

affecting the ordinary operating conditions of the system (depending on the redundancy level).

• The controls for parallel UPS module operation are standard in the Liebert NX, and the configu-

ration can be set up by changing the settings in configuration software.

• It is easy to install the parallel cables in a ring, providing high reliability and redundancy. And 

the intelligent paralleling logic provides the user with maximum flexibility. For example, shut-

ting down or starting up the UPS modules in the parallel system can be done in any sequence. If 

an overload transfer occurs, the whole system can recover automatically from bypass mode after 

the overload is cleared.

• The total load of the parallel system can be queried from each module’s liquid crystal display 

screen.

UPS Module 2

UPS Module 3

UPS Module 4

480V, 3W 

Output

IOB1

IOB2

IOB3

IOB4

UOB

480V DC 

Battery Input

480V, 3W 

Input

(Field Removable 

Jumper for Dual 

Input)

Bypass

Static 

Switch

 DC

      DC

Liebert NX UPS (40-200kVA)

Liebert NX Basic Paralleling Cabinet

  AC

            DC

  DC

            AC