Liebert NX 1+1 - Manual

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PDF Text Table of Contents

Table of Contents:

• Page 2 – Figure 1; Operating Principles
• Page 3 – Installation; Cabinet Installation; Parallel system composed of two UPS modules; Preliminary Checks; Conditions for Paral-; Protective Devices; Figure 2; Commissioning a Parallel System; Parallel; NOTE; The length and specifications of power; CAUTION; Interconnecting Cables
• Page 4 – Liebert Corporation; System Startup; Figure 3; EP O

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1

L

IEBERT

NX 1+1 S

YSTEM

P

RODUCT

S

PECIFICATION

AND

I

NSTALLATION

S

HEET

General

The Liebert NX UPS uses intelligent and reliable

decentralized technology to achieve parallel opera-

tion of two modules of the same rating.
The 1+1 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 reparations without

affecting the ordinary operating conditions of the

system (depending on the redundancy level).

Conditions for Parallel System

1. Each UPS module should have the same rating,

the same firmware and hardware version.

2. Each UPS module must have the same bypass

source.

3. The outputs of all UPS modules are connected

altogether.

4. The main inputs can be from different sources, but

the phase rotation sequence of main inputs,

bypass inputs and outputs must be correct and the

same.

5. The parallel logic cable and load sharing cable

must be connected in a ring correctly (See

Figure 2

)

Features of Parallel System

1. The hardware and firmware for parallel UPS

module operation is standard in the Liebert NX,

and the configuration can be set up by changing

the settings in configuration software.

2. 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, shutting

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.

3. The total load of the parallel system can be

queried from each module’s liquid crystal display

screen.

4. Optional monitoring background software can

treat the entire parallel system as a big

single-module UPS, and provide corresponding

management. It can also get the information for all

modules by connecting to just one of the modules.

+

!

CAUTION

An external maintenance cabinet is strongly
recommended to maintain the power supply to
load in case of complete maintenance.

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