Emerson Liebert NXC User Manual

Liebert® NXC from 10 to 20kVA

User Manual

AC Power for

Business-Critical Continuity

™

Liebert NXC 10/15/20kVA

UNINTERRUPTIBLE POWER SUPPLY

USER MANUAL

10H52188UM60 - rev. 2

2 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Liebert NXC

All rights, including rights of translation, reproduction
by printing, copying or similar methods, even of parts,
are reserved.
Offenders will be liable for damages.
All rights, including rights created by patent grant or
registration of utility model or design, are reserved.
Delivery subject to availability. Right of technical
modification reserved.

Liebert NXC may differ from the one displayed on the
front cover.

User Manual 10H52188UM60 - Rev. 2 - 09/2012 3

Liebert NXC Contents

Contents

CHAPTER 1 PRODUCT INTRODUCTION .................................................................................................... 5

1.1 Features ................................................................................................................................................... 5

1.2 Model Configurations .............................................................................................................................. 5

1.3 Appearance And Components ................................................................................................................. 6

1.3.1 Appearance ..................................................................................................................................... 6

1.3.2 Components .................................................................................................................................... 6

1.3.3 UPS device rear ................................................................................................................................ 8

1.4 Operating Principle .................................................................................................................................. 9

1.5 UPS State And Operation Mode .............................................................................................................. 10

1.5.1 Normal Mode ................................................................................................................................. 11

1.5.2 Bypass Mode .................................................................................................................................. 11

1.5.3 Battery Mode ................................................................................................................................. 11

1.5.4 ECO Mode (For Single UPS System Only) ........................................................................................ 11

1.5.5 FRC (Frequency Converter) Mode ................................................................................................... 11

1.5.6 Fault State ..................................................................................................................................... 11

1.5.7 Maintenance Bypass Mode ............................................................................................................. 12

CHAPTER 2 BATTERY ............................................................................................................................ 13

2.1 Brief Introduction ................................................................................................................................... 13

2.2 Safety .................................................................................................................................................... 13

2.3 Battery Power Cable ............................................................................................................................... 14

2.3.1 Overview ....................................................................................................................................... 14

2.3.2 Installing the Batteries ................................................................................................................... 14

2.3.3 Connecting the Batteries ............................................................................................................... 15

2.4 Battery Maintenance .............................................................................................................................. 18

2.5 Battery Recycling ................................................................................................................................... 18

CHAPTER 3 SINGLE UPS INSTALLATION AND COMMISSIONING ............................................................... 19

3.1 Unpacking Inspection ............................................................................................................................ 19

3.2 Installation Preparation .......................................................................................................................... 19

3.2.1 Location ......................................................................................................................................... 20

3.2.2 Environmental Requirement .......................................................................................................... 20

3.2.3 Installation Tools ............................................................................................................................ 21

3.3 External protection devices .................................................................................................................... 22

3.3.1 Rectifier And Bypass Input .............................................................................................................. 22

3.3.2 Battery Input (for external Battery) ................................................................................................. 24

3.4 Connecting Power Cables ...................................................................................................................... 24

3.4.1 Connecting I/O Cables ................................................................................................................... 25

3.4.2 Connecting and Installing External Battery ..................................................................................... 30

3.5 Single UPS Commissioning ..................................................................................................................... 31

3.5.1 Check Before Power-On ................................................................................................................. 31

3.5.2 Single UPS Parameters Setting ....................................................................................................... 31

3.5.3 Normal Mode Start-Up ................................................................................................................... 33

3.5.4 Battery Mode Start-Up ................................................................................................................... 33

CHAPTER 4 PARALLEL UPS INSTALLATION AND COMMISSIONING ........................................................... 34

4.1 Features ................................................................................................................................................. 34

4.2 Requirements ........................................................................................................................................ 34

4.3 Connecting Power Cables ...................................................................................................................... 34

4.3.1 Connecting I/O Cables ................................................................................................................... 34

4.3.2 Connecting Parallel Cables ............................................................................................................. 36

4.3.3 Connecting external Battery Cables ............................................................................................... 37

4.4 Commissioning Parallel System .............................................................................................................. 39

4.4.1 Check Before Power-On ................................................................................................................. 39

4.4.2 Parallel System Parameters Setting ................................................................................................ 39

4.4.3 Power-On Commissioning For Parallel System ............................................................................... 40

4.5 Installation And Commissioning For Double Bus System with common neutral ...................................... 40

4.5.1 Introduction .................................................................................................................................. 40

4.5.2 Installing External Protective Device ............................................................................................... 41

4.5.3 Connecting Power Cables .............................................................................................................. 41

4.5.4 Connecting LBS Cables ................................................................................................................... 41

4 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Contents Liebert NXC

4.5.5 Setting up the Double Bus System parameters ............................................................................... 42

CHAPTER 5 OPERATION AND DISPLAY PANEL ......................................................................................... 43

5.1 Introduction ........................................................................................................................................... 43

5.1.1 LED Indicators ................................................................................................................................ 43

5.1.2 Audible Alarm (Buzzer) .................................................................................................................. 43

5.1.3 Control Buttons ............................................................................................................................. 44

5.1.4 LCD And Menu Buttons .................................................................................................................. 44

5.2 LCD Screen Types ................................................................................................................................... 44

5.2.1 Start Screen ................................................................................................................................... 44

5.2.2 Primary Screen ............................................................................................................................... 45

5.2.3 Default Screen ............................................................................................................................... 45

5.3 Detailed Description Of Menu Items ....................................................................................................... 46

5.4 Prompt Window ..................................................................................................................................... 48

5.5 UPS Alarm Message List.......................................................................................................................... 48

CHAPTER 6 UPS OPERATION INSTRUCTIONS .......................................................................................... 51

6.1 UPS Start-Up .......................................................................................................................................... 51

6.2 Transfer Procedures Between Operation Modes ..................................................................................... 51

6.2.1 Transfer From Normal Mode To Battery Mode ................................................................................ 51

6.2.2 Transfer From Inverter Mode To Bypass Mode ................................................................................ 51

6.2.3 Transfer From Bypass Mode To Inverter Mode ................................................................................ 51

6.2.4 Transfer From Inverter Mode To Maintenance Bypass Mode ........................................................... 51

6.2.5 Transfer From Maintenance Bypass Mode To Inverter Mode ........................................................... 52

6.2.6 Operation with the external Maintenance Bypass in parallel systems .............................................. 52

6.3 UPS Complete Shutdown ....................................................................................................................... 53

6.4 EPO ........................................................................................................................................................ 53

6.5 Auto Restart ........................................................................................................................................... 53

6.6 UPS Reset ............................................................................................................................................... 54

6.7 Language Selection ................................................................................................................................ 54

6.8 Changing Current Date And Time ........................................................................................................... 54

6.9 Control Password ................................................................................................................................... 54

CHAPTER 7 COMMUNICATION .............................................................................................................. 55

7.1 Installing Intellislot cards ........................................................................................................................ 55

7.1.1 Intellislot card Port ......................................................................................................................... 55

7.2 Connection cables for dry contact port and opto-coupled port ............................................................... 55

7.3 Connecting USB Communication Cables ................................................................................................ 57

CHAPTER 8 MAINTENANCE ................................................................................................................... 58

8.1 Fan Maintenance .................................................................................................................................... 58

8.2 Battery Maintenance .............................................................................................................................. 58

8.3 Cleaning UPS ......................................................................................................................................... 59

8.4 Checking UPS State ................................................................................................................................ 59

8.5 Checking UPS Functions ......................................................................................................................... 59

CHAPTER 9 PRODUCT SPECIFICATIONS ................................................................................................. 60

9.1 Conformity and Standards ..................................................................................................................... 60

9.2 Environmental Characteristics ................................................................................................................ 60

9.3 Mechanical Characteristics ..................................................................................................................... 60

9.4 Electrical Characteristics (Input Rectifier) ............................................................................................... 61

9.5 Electrical Characteristics (Intermediate DC Circuit) ................................................................................ 61

9.6 Electrical Characteristics (Inverter Output) ............................................................................................. 62

9.7 Electrical Characteristics (Bypass Input) .................................................................................................. 62

9.8 Efficiency, Heat Losses and Air Exchange ................................................................................................ 63

CHAPTER 10 OPTIONS .......................................................................................................................... 64

10.1 Option list ............................................................................................................................................ 64

10.2 Communication Cables ........................................................................................................................ 64

10.3 Battery Cabinet .................................................................................................................................... 64

10.4 Liebert NXC Input Transformer Version ................................................................................................ 65

10.5 Liebert NXC Output Transformer Version ............................................................................................. 65

APPENDIX 1 ABBREVIATIONS ................................................................................................................ 66

APPENDIX 2 INFORMATION FOR THE PROTECTION OF THE ENVIRONMENT ............................................. 67

User Manual 10H52188UM60 - Rev. 2 - 09/2012 5

Liebert NX Product Introduction

Chapter 1 Product Introduction

Liebert NXC UPS (UPS for short) is an intelligent online UPS system with sine wave output developed by Emerson Network
Power. The UPS offers reliable and high quality AC power to the precision instrument.

The UPS is suitable for supplying AC power to small scale computer centers, networks, communication systems, automatic
control systems and precision instruments.

This chapter introduces the features, model configurations, appearance and components, operating principle, UPS state and
operation mode, and specifications of the UPS.

1.1 Features

The UPS features include:

 Compatible with two modes: 3-phase and single-phase outputs. The system wiring must be checked and the panel
setting must be conducted manually

 Up to 4 units maybe connected in parallel, in order to form a n+1 redundant parallel system
 High-frequency, double conversion topology, with high input power factor, wide input voltage range, and output

immunity to grid interference, thus suitable for use in areas with unstable mains supply

 High power density
 Full digital control technology based on digital signal processor (DSP) to achieve high system reliability with

self-protection and fault diagnosis functions

 Intelligent battery management to extend the battery life
 Operation and display panel with both LCD and LED indication to help you learn about the system operating state and

operating parameters

 Capable of ECO power supply mode, which helps you save energy to the maximum extent
 Flexible network management with Emerson monitoring software
 Fan fault self-test and automatic recognition functions
 SNMP card option, providing network communication function
 Can be connected to multiple battery strings, in order to increase autonomy when in battery supply mode

1.2 Model Configurations

Three power ratings are available for Liebert NXC UPS: 10kVA, 15kVA and 20kVA.

The model configurations are shown in Table 1-1.

Table 1-1 Model configurations

Typ e De scri pti on

LI6010… (10kVA)

For single UPS system, for 1 + 1 parallel system and above 1 + 1 parallel system, the external battery cabinet
with larger capacity is recommended

LI6015… (15kVA)

LI6020… (20kVA)

6 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Product Introduction Liebert NXC

1.3 Appearance And Components

1.3.1 Appearance

The UPS device appearance is shown in Figure 1-1.

Front view Rear view

Figure 1-1 UPS appearance

1.3.2 Components

UPS module front panel

As shown in Figure 1-2, the UPS module front panel provides ventilation holes, operation and display panel, LED indicators, DIP
switch and battery cold start button.

Figure 1-2 UPS module front panel

Ventilation hole

Operation and display panel

LED indicator

DIP switch and battery
cold start button (with
protective cover)

User Manual 10H52188UM60 - Rev. 2 - 09/2012 7

Liebert NX Product Introduction

UPS module rear panel

As shown in Figure 1-3 and Figure 1-4, the UPS module rear panel provides parallel ports, Load Bus Synchronization (LBS) ports,
Intellislot cards port, dry contact ports, opto-coupled ports, USB port and ventilation holes. The SIC-SNMP card in the
Intellislot cards port is optional, it is sold separately.

Figure 1-3 UPS module rear panel

Figure 1-4 User dry contact and opto-coupled connectors

Note

Non-authorized personnel are prohibited from opening the UPS chassis cover.

Parallel port

LBS port

Intelligent card

port (with

protective cover)

Dry contact port
and opto-coupled ports

USB port

Ventilation hole

8 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Product Introduction Liebert NXC

1.3.3 UPS device rear

As shown in Figure 1-5, the UPS comprises UPS module, Input/Output MCBs and I/O terminal block.

Figure 1-5 Rear view (terminal housing cover removed)

INPUT/OUTPUT MCBs

UPS MODULE

I/O TERMINAL BLOCK
Screw terminals M6

QS4 (UPS OUTPUT)

QS3 (MAINTENANCE BYPASS)

QS6/7 (INTERNAL BATTERY)

QS1 (PRIMARY MAINS INPUT)

QS2 (BYPASS MAINS INPUT)

FU1/FU2
Supply fuses for LIFE (AC 230V)
max. cables cross-sectional area = 2,5mm

2

User Manual 10H52188UM60 - Rev. 2 - 09/2012 9

Liebert NX Product Introduction

1.4 Operating Principle

The operating principle of the UPS is shown in Figure 1-6.

Figure 1-6 UPS operating principle

1. The UPS is composed of mains input (mains and bypass), I/O filter, rectifier/PFC, charger, inverter, bypass, battery, DSP
controller, System Control Power and UPS output.

2. Under normal mains supply conditions, the rectifier switches on and the charger supplies recharge power to the battery.
Before the UPS is switched on, the load is connected directly to the mains supply via the Bypass. Once the UPS has been
switched on, the mains input supplies DC power to the inverter via the rectifier/PFC section. The inverter then converts DC
power into pure sine wave AC power, and supplies AC power to the load through the electronic transfer switch.

3. If the mains supply is outside the normal operating limits, the rectifier/PFC circuit boosts the battery voltage and supplies it
to the inverter. The inverter then converts it into pure sine wave AC power, and supplies AC power to the load through the
electronic transfer switch.

4. After the mains returns to normal state, the UPS will automatically transfer from battery mode to Normal mode, the mains
supplies DC power to the inverter through the rectifier/PFC circuit, and then the electronic transfer switch supplies AC power
to the load.

Bypass input

Mains input

Output

Input filter

Bypass

Inverter

Output filter

Rect ifier/PF C

Auxiliary

p

ower

Charger

DSP

Battery

10 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Product Introduction Liebert NXC

1.5 UPS State And Operation Mode

The UPS state and operation mode include: Normal mode, Bypass mode, Battery mode, FRC (Frequency Converter) mode,
ECO mode, Fault state and Maintenance Bypass mode. The operation schematic diagrams of Normal mode, Bypass mode,
Battery mode, Maintenance Bypass mode, ECO mode and FRC mode are shown in Figure 1-7.

Figure 1-7 Operation schematic diagram

For the LED indicators introduced in this section, refer to 5.1.1.

Bypass input

Mains input

Normal mode

Output

Bypass input

Mains input

Bypass mode

Output

Bypass input

Mains input

Maintenance
Bypass mode

Output

Bypass input

Mains input Output

ECO mode

Mains
input

Output

FRC mode

Bypass input

Mains input

Battery mode

Output

User Manual 10H52188UM60 - Rev. 2 - 09/2012 11

Liebert NX Product Introduction

1.5.1 Normal Mode

When the mains input is normal, the load is provided with voltage-stabilized and frequency- stabilized power by the inverter,
and meanwhile the battery is charged.

In Normal mode, the inverter indicators are on (green).

1.5.2 Bypass Mode

If the overload time-out, inverter or rectifier failure appears during the UPS operation in Normal mode, the UPS will transfer to
Bypass mode, that is, the load is powered by the bypass source, which comes directly from the mains input; if the rectifier is
normal, the internal charger will charge the battery. In Bypass mode, the inverter indicators are off.

Note

In the event of mains failure or mains voltage out of range in Bypass mode, the UPS will shut down and stop the output.

1.5.3 Battery Mode

Upon mains failure, rectifier overload or mains voltage out of range, the rectifier and internal charger will become inoperative,
and the battery will supply power to the load through the inverter. The inverter indicators are on together with buzzer
alarming, which notifies you that the UPS is in Battery mode.

Note

1. The battery has been fully charged before delivery. However, transportation and storage will inevitably cause some capacity loss.
Therefore, it is required to charge the battery for eight hours before putting the UPS into operation, so as to ensure the adequate backup
time for battery.

2. The battery cold start can also be used to start the UPS from the Battery (charged) mode upon mains failure. Therefore, the battery
power can be used independently for improving the system availability to some extent.

1.5.4 ECO Mode (For Single UPS System Only)

In ECO mode, the load is powered by bypass when the bypass voltage is normal, and the load is powered by inverter when the
bypass voltage is abnormal. ECO mode is an energy-saving operation mode. For power equipment that is immune to power
grid quality, you can use the ECO mode for power supply through bypass to reduce the power loss.

Note

1. In ECO mode, if the bypass failure or abnormal bypass voltage appears when the output is not overloaded, the UPS will transfer to
Normal mode. However, if the bypass failure or abnormal bypass voltage appears when the output is overloaded, the UPS will not transfer
to Normal mode, but shut down the bypass.

2. In ECO mode, the efficiency of the UPS is up to 98%.

1.5.5 FRC (Frequency Converter) Mode

This mode can be used for mains and load with different frequencies (60/50Hz or 50/60Hz).

1.5.6 Fault State

In Normal mode, the UPS will transfer to Bypass mode in the event of an inverter failure or UPS overtemperature. In Battery
mode (with no bypass mains), the UPS will shut down and interrupt the supply of energy to the load in the event of an inverter
failure or UPS overtemperature. In the Fault state, the fault indicators will turn on, the buzzer will keep beeping, and the
corresponding fault information will be displayed on the LCD.

12 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Product Introduction Liebert NXC

1.5.7 Maintenance Bypass Mode

If the maintenance and repair for UPS is needed, you can switch the load to the Maintenance Bypass through maintenance
bypass MCB (Miniature Circuit Breaker), and the power to the load is uninterrupted. The maintenance bypass Miniature Circuit
Breaker is located on the rear panel of the UPS device, and the capacity meets the requirements of total load capacities.

Note

If the UPS has a malfunctions and can not work normally, please get in touch with the nearest Emerson branch office or local service center.
It is prohibited to repaire

by yourself, as the personnel injury and damage to the equipment may occur.

User Manual 10H52188UM60 - Rev. 2 - 09/2012 13

Liebert NXC Battery

Chapter 2 Battery

This chapter provides relevant information about the battery, including a short introduction, and information on battery
safety, battery power cables, battery maintenance and recycling.

2.1 Brief Introduction

The UPS battery string consists of batteries connected in series in order to supply the rated DC input voltage for the UPS
inverter. The battery backup time (that is, the time that the battery can continue to supply the load for when the mains supply
is interrupted) depends on load level and the ampere-hour capacity of the batteries. Therefore, it may be necessary to connect
several battery strings in parallel.

The NXC UPS includes a battery compartment that can accommodate the internal batteries.

In the case of UPS configurations without internal batteries, the unit must be connected to an external battery cabinet. The
external battery is fitted with a protective device that can be used to isolate the battery in the event of maintenance work. This
device is mounted inside or in close proximity to the battery cabinet.

Note

1. The external battery cabinet for the UPS can hold up to 128 12 V batteries.

2. It must be possible to disconnect the battery from the UPS when carrying out maintenance or service work. The fuse holder can be
switched on or off manually.

3. The requirements of the EC directives are satisfied when battery cabinets are used with original accessories. If alternative batteries are
used, you must ensure that the applicable EC directives are met, and declare conformity.

2.2 Safety

Take special care when working with the batteries associated with the UPS. When all the blocks are connected together, the
battery string voltage can be up to 460 Vdc. This is potentially lethal. Please follow the precautions for high voltage operation.
Only qualified personnel are allowed to install and maintain the battery. To ensure safety, the external batteries are to be
installed inside a lockable cabinet or in a purpose-designed, dedicated battery room, so that they are only accessible to
qualified maintenance personnel.

During battery maintenance, pay attention to the following items:

 Ensure that the UPS is in maintenance mode.
 The battery block number setting in the background software must be consistent with the actual battery block number.
 The battery complete Ah setting must be done in the background software.
 If the battery fuses are blown, the UPS must be repaired by authorized service personnel. The fuses must be replaced

using the same type as those that were delivered with the UPS and must be supplied by the same manufacturer.

Note

Full safety instructions concerning the use and maintenance of UPS batteries are provided in the appropriate battery manufacturers’
manuals. The battery safety information contained in this section relates to key considerations that must be taken into account during the
installation design process and might affect the design outcome depending on localized conditions.

14 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Battery Liebert NXC

Warning: Hazardous battery voltage present behind covers

1. No user-serviceable parts are located behind covers that require a tool for their removal. Only qualified service personnel are authorized
to remove such covers.

2. Before working on the copper bars connected to the external battery, please ensure they are disconnected from all power supplies.

3. Observe the following safety precautions when working on the batteries:

1) The battery must be firmly and reliably connected. After the connection is completed, all connections between the terminals and the
batteries must be calibrated. The requirements for torque specified in the instructions or user manual provided by the battery
manufacturer must be satisfied. All connections between the terminals and the batteries must be inspected and tightened at least once a
year. Failure to observe this may result in fire!

2) Inspect the battery appearance before accepting and using the battery. If there is any damage to the packaging, dirty battery terminals,
terminal erosion, rust, or cracks in the enclosures, deformation or electrolyte leakage, replace it with a new product. Failure to do so may
result in battery capacity reduction, electrolyte leakage, or fire.

3) Batteries are very heavy. Please use the proper method when moving and lifting batteries to prevent any injuries or damage to the
battery terminals. Severely damaged batteries may catch fire.

4) The battery terminals must not be subject to any force, such as the pulling force or twisting force exerted by cables. This may damage
the internal connection of the battery and severe damage may result in fires.

5) The battery must be installed and stored in a clean, cool, and dry environment. Do not install the battery in a sealed battery chamber or a
sealed room. The battery room ventilation must comply with EN50272-2001 as a minimum requirement. Failure to follow this instruction
may result in battery bulging, fire, or even injuries.

6) The battery must be kept away from heat sources such as transformers or fire sources. Do not burn the battery or set the battery on fire,
as this may result in electrolyte leakage, battery bulge, fire, or explosion.

7) Do not connect any conductor directly between the positive and negative terminals of the batteries. Remove rings, watches, necklaces,
bracelets, and other metal objects before working on the batteries and ensure that the tools (for example, wrenches) are insulated. Failure
to do so may result in battery burning, explosion, human death or injury.

8) Do not dismantle, modify, or damage the battery. This may result in a battery short circuit, electrolyte leakage, or even injury.

9) Clean the battery enclosure with a damp cloth. To avoid any static or arcing, do not use dry cloths or dusters to clean the battery. Do not
use organic solvent, such as thinner, gasoline, or volatile oil, as this may crack the battery enclosure. In the worst case scenario, this may
result in a fire.

10) The battery contains diluted sulfuric acid. In normal use, the diluted sulfuric acid is absorbed by battery the baffle and pole plates.
However, if the battery is damaged, the acid may leak from the battery. Therefore, use personal protective equipment such as goggles,
rubber gloves, and an apron when working on the battery. The diluted sulfuric acid may cause blindness if it enters the eyes and burns if it
comes into contact with the skin.

11) The battery will be affected by shorting, electrolyte dry-up, or positive-pole plate erosion at the end of its life. If it is still used in this
state, thermal runaway, bulging, or electrolyte leakage may occur. Please replace the battery before it reaches this state.

12) Before connecting or disconnecting the battery connection cables, please isolate the charging power.

13) Check if the battery has been unexpectedly earthed. If this is the case, remove the earth connection. Contact with any part of the
earthed battery may result in an electric shock.

2.3 Battery Power Cable

2.3.1 Overview

Please install and connect the batteries according to the following description and graphic representation.

2.3.2 Installing the Batteries

1. Before installation, check the batteries for signs of damage, inspect and count the accessories, and carefully read this
manual and the user manual or installation instructions provided by the battery manufacturer.

2. There must be a clearance of 10 mm between the vertical sides of the batteries to allow for the flow of air around the
batteries.

3. A sufficient amount of clearance must be maintained between the battery top and the underside of the layer above it to
facilitate battery monitoring and maintenance.

4. The batteries must be installed from the bottom layer upwards to avoid creating a high center of gravity. The battery must
be installed properly and protected from vibrations or shock.

5. An isolating device shall be fitted as close as possible to the battery in accordance with the local installation requirements.

User Manual 10H52188UM60 - Rev. 2 - 09/2012 15

Liebert NXC Battery

6. In the case of a parallel UPS system that uses a common battery bank, an additional isolating device (switch) must be
installed in the dedicated common battery connection to each individual UPS, so that system maintenance can be carried out
correctly. In any event, we advise against using common battery solutions as they reduce the reliability of the system.

7. Measure the battery voltage and calibrate the battery voltage after starting up the UPS.

2.3.3 Connecting the Batteries

1. Check that the battery fuses are not inserted. These must be fitted during commissioning, NOT during installation.

2. If the battery cabinet is installed on a raised floor or side by side with the UPS on a solid floor, the battery power cables and
other cables can enter the UPS cabinet through the base of the cabinet. The cables for connecting the UPS to the battery
cabinets are not included in the delivery. They can be provided by the manufacturer upon request. For the best interference
suppression (to reach class C2 EM) we recommend using shielded battery cables between the UPS cabinet and the battery
cabinet. The shielding must be connected to both the UPS and the battery cabinets.

3. Make the ground connections (PE).

4. When multiple battery strings are used, they must be connected in series and then in parallel. Before applying load and
commencing power-up, be sure to measure the total voltage of the battery strings and make sure that it is correct. The
negative and positive terminals of the battery must be connected to the corresponding negative and positive battery
terminals of the UPS, in accordance with the labels on the battery and the UPS. Reverse battery connection may result in
explosion, fire, damage to the battery, damage to the UPS, or personal injury.

5. After connecting the battery cables, install an insulating shroud for each terminal.

6. The bending radius of the cable is to be larger than 10D, where D is the outer diameter of the cable.

7. After connecting the cables, do not pull on the battery cables or the cable terminals.

8. Do not cross the battery cables during connection and do not tie the battery cables together.

9. To connect the cables for the internal batteries, refer to Figure 2-1 and Figure 2-2. To connect the cables for the external
batteries, refer to the "Battery Installation Manual".

16 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Battery Liebert NXC

ARRANGE THE BATTERIES AND CONNECT THEM AS ILLUSTRATED IN Figure 2-1.

Figure 2-1 Internal Battery Cable Connection

BATTERY SHELF

BATTERY 8

BATTERY 7

BATTERY 6

BATTERY 5

BATTERY 4

BATTERY 3

BATTERY 2

BATTERY 1

XBS

TOP VIE W

FRONT

User Manual 10H52188UM60 - Rev. 2 - 09/2012 17

Liebert NXC Battery

CONNECT THE BATTERY CABLES AS ILLUSTRATED IN Figure 2-2.

Figure 2-2 Internal Battery Cable Connection

For safety reasons, a female connector has been inserted on male connector of battery shelf; disconnect the female connector
in order to connect the XBS... male connector of the battery shelf to the female connector on the UPS.

N.B. The 3

rd

and 4

th

strings may also be installed in the field, during the initial installation.

BATTERY STRING 1

BATTERY STRING 2

BATTERY STRING 3

BATTERY STRING 4

XBS1

XBS2

XBS3

XBS4

XBS5

XBS6

XBS7

XBS8

XBS9

XBS10

XBS11

XBS12

XBS13

XBS14

XBS15

XBS16

18 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Battery Liebert NXC

2.4 Battery Maintenance

For battery maintenance and maintenance precautions, refer to IEEE-Std-1188-2005 and the relevant manuals provided by the
battery manufacturer.

Note

1. Check that all safety devices are present and that they function correctly. Check that the battery management parameters are set
correctly.

2. Measure and record the air temperature inside the battery room.

3. Check the battery terminals for damage and heating and ensure that there is no evidence of corrosion. Check the battery enclosure and
terminal covers for damage.

2.5 Battery Recycling

If the battery leaks electrolyte, or is otherwise physically damaged, it should be placed in a container resistant to sulphuric acid
and disposed of in accordance with local regulations.

Disused lead-acid storage batteries are classified as dangerous waste and are critical elements in disused battery pollution
control. Storage, transportation, use, and disposal of batteries must comply with the national and local laws and regulations
on dangerous waste, disused battery pollution prevention, and other standards.

In accordance with the relevant national regulations, disused lead-acid storage batteries must be recycled and must not be
disposed of by other methods. Illegal dumping or any other improper disposal of disused lead-acid storage batteries may
cause severe environmental pollution and those responsible may be liable for prosecution.

As a lead-acid storage battery supplier, Emerson has created an excellent service network and disused battery recycling
system to help customers dispose of lead-acid storage batteries legally and properly. For detailed information about Emerson's
disused battery recycling system, please consult the local customer service center or Emerson sales office. If the customer
disregards these instructions or does not use Emerson's disused battery recycling system, Emerson cannot be held responsible
for any environmental consequences of the failure to dispose of disused battery products correctly.

User Manual 10H52188UM60 - Rev. 2 - 09/2012 19

Liebert NXC Single UPS Installation And Commissioning

Chapter 3 Single UPS Installation And Commissioning

This chapter describes the installation, cable connection and commissioning of the single UPS.

Each site has its peculiarity, so this chapter provides the guidance with general installation procedures and methods for the
installation engineer, who should conduct the installation according to the actual conditions.

Warning: professional installation

The UPS should be installed by a qualified engineer according to the information contained in this chapter. If any problem is found, please
get in touch with Emerson local service center immediately.
The UPS shall not be powered on without approval of the commissioning engineer.
For other equipments which are not introduced in this manual, the detailed information about mechanical installation and electrical

installation are delivered with the equipment.

Note: 3-phase 5-line for power input

The UPS can be connected to 3-phase 5-line (L1, L2, L3, N, PE) TN and TT AC power distribution system (IEC/EN 60364-3).

3.1 Unpacking Inspection

After the UPS arrival, you should unpack it and check the following items:

1. Visually inspect the UPS appearance for transportation damage. If any problem is found, please notify the carrier
immediately.

2. Check the accessories and models against the below delivery list. If any problem is found, please notify the dealer
immediately.

 Safety manual
 User manual
 Test bulletin
 Insulating material (28010935)
 Copper busbar kit (21500904)
 1x connector 3 PIN pitch 3,81mm (14120115)
 3x connector 2 PIN pitch 3,81mm (14120116)
 7x lugs (1417230))

3.2 Installation Preparation

Prior to transportation, make sure of the height of any doors are sufficient and
there not other obstacles standing in the passage of the UPS. Refer to the following
for dismantling of machine cabinet.

 Remove outer packaging and side supporting plates first.
 Place dismantled wooden cover in front of the pallet, and then fix the wooden cover to the pallet with the hook provided, so

as to form a ramp, push UPS down the ramp.
 Routine maintenance operations may involve removal of front and rear panels. Space must be provided to permit the unit to

be rolled back and forward.
 Always install the Stabilizing Brackets to enhance the stabilizing of the UPS. If the UPS needs to be moved after Stabilizing

Brackets have been attached, the Brackets must be removed.

 To remove the Stabilizing Brackets, unscrew all the nuts and bolts holding it in place and slide it out from under the UPS.
 When the UPS has reached its new position, push the Brackets into its down position again, and tighten the screws.

20 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Single UPS Installation And Commissioning Liebert NXC

 Brake Pad: with 19mm wrench in clockwise direction to screw the Brake Pads down to the ground, to prevent the UPS
moving.

3.2.1 Location

To extend the UPS life, the place chosen must offer:

 The UPS must be installed vertically, on a level and even surface
 Convenient wiring
 Adequate operator access area
 Adequate ventilation to meet the heat dissipation requirement
 No corrosive gas, such as sulfur dioxide and so on
 No excessive moisture or heat source
 No excessive dust
 Compliance with fire-fighting requirements
 Operating temperature compliant with the specifications, see Table 9-2 for details

3.2.2 Environmental Requirement

UPS room

The UPS is designed for indoor installation, which should be installed in a clean and well-ventilated environment, so as to keep
the ambient temperature within the specifications.

The internal fans provide the forced air cooling for the UPS. Cooling air enters the UPS through the ventilation holes on the
front panel, and exhausts the hot air through the back ventilation holes. Therefore, do not obstruct the ventilation holes.
Maintain at least 200mm clearances between the front, rear, side panels of the UPS and the wall or adjacent equipment (see
Figure 3-1), so as not to obstruct the UPS ventilation and heat dissipation. Otherwise, the UPS internal temperature will rise,
which will shorten the UPS life.

User Manual 10H52188UM60 - Rev. 2 - 09/2012 21

Liebert NXC Single UPS Installation And Commissioning

Figure 3-1 Installation clearances

Note

The UPS should be installed only on the concrete surface or other non-flammable surfaces.

UPS room (when Battery is integrated)

A small amount of hydrogen and oxygen will be generated at the end of battery charging, therefore, you must ensure that the
fresh air ventilation of battery installation environment meets the EN50272-2001 requirements.

The battery ambient temperature should be the constant temperature, for the ambient temperature is the main factor to
affect the battery capacity and life. The battery standard operating temperature is 20°C, operation above this temperature will
shorten the battery life, and operation below this temperature will reduce the battery capacity. If the battery average
temperature in operation rises from 20°C to 30°C, the battery life will be reduced by 50%; if the battery temperature in
operation exceeds 40°C, the battery life will be decreased exponentially. In general, the ideal ambient temperature of the
battery is 15°C ~ 25°C. The battery should be kept away from heat and ventilation holes.

When the UPS uses an external battery, you must install a battery protective device (such as fuse or circuit breaker) near to the
battery, and use the shortest wiring distance between the protective device and battery connection.

Storage

If the UPS and/or battery is to be stored for any length of time before being installed, it must be kept indoors, in a cool, dry,
well ventilated environment. The ideal battery storage temperature is between 20 and 25°C.

Warning: battery hazards

During the battery storage, the battery must be periodically charged according to the battery instructions. You can connect the UPS to the
mains temporarily when charging the battery,

so as to charge the battery for battery activation

.

3.2.3 Installation Tools

The tools must be insulated.

Note: for exchanging the
UPS Power Module or the
Battery Tray a front
clearance of 950mm is
necessary.

General view

22 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Single UPS Installation And Commissioning Liebert NXC

3.3 External protection devices

This device is equipped with manual switches intended only for Service Bypass and Internal Service operations. It is therefore
essential that the customer install external protection devices at the installation site. These must be installed near the unit and
labeled as the line power separation device for the UPS (see IEC/EN 62040-1).

Warning

The following label must be displayed on all switching devices installed in the same electrical system as the UPS, even when they are
located far from the area where the system is located (according to European standard IEC/EN 62040-1):

MAKE SURE THE UNINTERRUPTIBLE POWER SYSTEM IS ISOLATED

BEFORE WORKING ON THIS CIRCUIT

Use of differential protection devices

Note: Differential Current Breakers

 The UPS does not require differential protection devices connected ahead of it. However, when these devices are installed in compliance

with local regulations, note that separate DCBs in the line power and bypass line power circuits may trip unexpectedly, thus interrupting
the power supply to the unit. Therefore, if a DCB must be installed, only one should be used for both primary and bypass inputs.

 In parallel distributed systems, only one common differential protection device should be installed ahead of the point where the line

divides into the UPS primary and bypass line power circuits. If separate DCBs are installed in different configurations, they may trip
unexpectedly.

 In order to guarantee correct distribution in the neutral cables, installation personnel shall make sure that the lengths of the cables are

as equal as possible. However, if the bypass lines lead from sources that are electrically isolated from each other, a differential
protection device may be installed on each line. In this case, and in cases when the load is supplied from the Bypass via the Static Bypass
Switch, the isolated sources are connected in parallel. A case-bycase analysis should be made as to whether any resulting imbalance
between the currents on the Bypass lines is compatible with the respective protection devices.

3.3.1 Rectifier And Bypass Input

Overcurrent

The appropriate overcurrent protective device should be installed at the mains input power distribution, and the current
capacity of power cable and the system overload requirements should be taken into account in installation. It is recommended
to use the thermo magnetic circuit breaker which satisfies with IEC/EN 60947-2 tripping curve C (normal) when the current
value reaches 125% of the current value listed in Table 3-1.

Split-bypass

When the system adopts split-bypass, separate protective devices should be installed at the mains input power distribution
respectively for the mains and bypass.

Bypass backfeed protection

When using the bypass backfeed protection function, it is necessary to install a protective device with auxiliary contact
function upstream of the UPS bypass input; the auxiliary contact should be connected to the system opto-coupled contact
port (refer to section 7.2 and Figure 3-2).

Note

The same neutral line must be used for the rectifier and bypass power.

User Manual 10H52188UM60 - Rev. 2 - 09/2012 23

Liebert NXC Single UPS Installation And Commissioning

Figure 3-2 External protective device for backfeed protection

Earth leakage current

The residual current detector (RCD) for the UPS upstream input power distribution should be:

 Sensitive to the DC unidirectional pulse (level A) in power distribution network
 Insensitive to the transient current pulse

The residual current circuit breaker (RCCB) must be sensitive to the DC unidirectional pulse (level A) in power distribution
network, but insensitive to the transient current pulse, as shown in Figure 3-3 respectively.

Figure 3-3 RCCB symbols

When using the earth RCD in split-bypass system or parallel system, the RCD should be installed at the upstream input power
distribution terminal to avoid generating false alarms.

The earth leakage current introduced by the RFI filter in the UPS ranges from 3.5mA to 1000mA. It is recommended to
confirm the sensitivity of each differential device of the upstream input power distribution and downstream power
distribution (to load).

24 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Single UPS Installation And Commissioning Liebert NXC

3.3.2 Battery Input (for external Battery)

The overcurrent protective device has been placed in the battery cabinet, when you choose the battery cabinet option
provided by Emerson. Otherwise, the external battery cabinet should provide DC compatible fused circuit breaker, so as to
provide the overcurrent protection for the UPS and its batteries.

3.4 Connecting Power Cables

I/O cables and battery cables are required for connection. When connecting the cables, you should follow the local wiring
regulations, take the environmental situation into account, and refer to Table 3B of IEC/EN 60950-1. The max. current in
different operating modes is listed in Table 3-1, the recommended min. cable CSA is listed in Table 3-2. Select the appropriate
cables according to Table 3-1 and Table 3-2.

Table 3-1 Max. steady state AC and DC current

UPS rated

power (kVA)

Rated current (A)

Mains input current

1, 2

upon battery

charging with max. ability

Gross output current

2

at full load

Battery discharging current at min.

battery voltage (EOD)

(30 blocks)

380V 400V 415V 380V 400V 415V

10 (3-in 3-out) 22 21 20 15 15 14

34

10 (3-in 1-out) 22 21 20 45 44 42 34

15 (3-in 3-out) 29 28 27 23 22 21 50

15 (3-in 1-out) 29 28 27 69 65 63 50

20 (3-in 3-out) 37 35 34 30 29 28 67

20 (3-in 1-out) 37 35 34 90 87 84 67

Note:
When selecting the battery cables, according to the current value shown in table, the max. allowable voltage drop is 4Vdc. Do not ring the
cables, so as to avoid increasing the electromagnetic interference (EMI).
1: The mains current input of the rectifier and bypass.
2: Non-linear load (switch mode power) affects the neutral cable design of output and bypass. The neutral cable current may exceed the
rated phase current, in general, 1.732 times as large as the rated current (not applicable, when 3-in 1-out mode)

Table 3-2 Single UPS cable CSA (unit: mm2, ambient temperature: 25°C）

Model Input Output Bypass Neutral cable PE Battery

10kVA (3-in 3-out) 4 4 4 4 4 6

10kVA (3-in 1-out) 4 10 10 10 10 6

15kVA (3-in 3-out) 6 6 6 6 6 10

15kVA (3-in 1-out) 6 16 16 16 16 10

20kVA (3-in 3-out) 10 10 10 16 10 16

20KVA (3-in 1-out) 10 25 25 25 16 16

The recommended UPS input MCB capability is listed in Table 3-3, select the MCBs according to your requirements.

Note

The UPS is high leakage current equipment, it is not recommended to configure the MCB with leakage current protection function.

Table 3-3 UPS MCB selection

Model Input interface

Recommended capability of input

external MCB

Battery MCB Output interface

Main Bypass

10kVA (3-in 3-out) Terminal block 32A 32A DC 35A Terminal block

10kVA (3-in 1-out) Terminal block 32A 63A (1P) DC 35A Terminal block

15kVA (3-in 3-out) Teminal block 40A 40A DC 63A Terminal block

15kVA (3-in 1-out) Teminal block 40A 80A (1P) DC 63A Terminal block

20kVA (3-in 3-out) Teminal bock 50A 50A DC 80A Terminal block

20kVA (3-in 1-out) Teminal block 50A 100A (1P) DC 80A Terminal block

Note:
The 3-in 1-out MCB (125A) is used to connect the bypass input upon split-bypass configuration. The main MCB (63A) can be used only
upon common source configuration

User Manual 10H52188UM60 - Rev. 2 - 09/2012 25

Liebert NXC Single UPS Installation And Commissioning

3.4.1 Connecting I/O Cables

The power cables of the UPS should be connected through the I/O terminal block located on the UPS rear panel. Figure 3-4
gives the terminal layout of the I/O terminal block.

3-in 3-out: max. cable cross-sectional area = 16mm

2

3-in 1-out: with copper shorting bars n. 4, 5, 7, 8, 10 = max. 25mm

2

Figure 3-4 Terminals layout of the I/O terminal block

Power distribution mode

According to the user’s requirements, the I/O cable connections can be configured into four types:

3-in 3-out, common source configuration (factory default),

3-in 3-out, split-bypass configuration,

3-in 1-out, common source configuration,

3-in 1-out, split-bypass configuration.

Self-distribution

The four I/O cable connection procedures of the self-distribution are as follows:
 3-in 3-out, common source configuration (factory default)

1. Connect the live lines (input phase L1, input phase L2 and input phase L3), N line and PE line respectively to the I/O terminal
block (U1, V1, W1 and N1 and PE terminals) of the UPS.

Short connect U1 and U2, V1 and V2, W1 and W2 of the UPS I/O terminal block using the copper shorting bar 3 respectively
(factory default).

2. Connect the live lines (output phase L1, output phase L2 and output phase L3), N line and PE line respectively to the I/O

terminal block (U3, V3, W3 and N3 and PE terminals) of the UPS, as shown in Figure 3-5.

OUTPUT GND MAINS INPUT BYPASS INPUT EXT. BATTERY

BAT+

BAT-

BAT N

Screw terminal M6

26 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Single UPS Installation And Commissioning Liebert NXC

Figure 3-5 3-in 3-out, common source configuration cable connection

 3-in 3-out, split-bypass configuration

1. Remove all the copper shorting bars 3 from the UPS I/O terminal block.

2. Connect the live lines (mains input phase L1, mains input phase L2 and mains input phase L3), N line and PE line respectively
to the I/O terminal block (U1, V1, W1 and N1 and PE terminals) of the UPS.

3. Connect the live lines (bypass input phase L1, bypass input phase L2 and bypass input phase L3) and N line respectively to
the I/O terminal block (U2, V2, W2 and N2 terminals) of the UPS.

4. Connect the live lines (output phase L1, output phase L2 and output phase L3), N line and PE line respectively to the I/O
terminal block (U3, V3, W3 and N3 terminals and PE terminal) of the UPS.

User Manual 10H52188UM60 - Rev. 2 - 09/2012 27

Liebert NXC Single UPS Installation And Commissioning

Figure 3-6 3-in 3-out, split-bypass configuration cable connection

 3-in 1-out, common source configuration

Warning

The factory default of this UPS is 3-in 3-out, common source configuration. Change the power distribution mode of the UPS to 3-in 1-out
according to the steps described in the following section Changing power distribution mode. Continue the following input and output
power cable connection and power-on commissioning after confirming that the change has been successful.

1. Confirm that the power distribution mode of the main UPS has been changed to 3-in 1-out according to the steps described
in the following section Changing power distribution mode.

2. As shown in Figure 3-7, attach the self-adhesive insulating film (accessory) on the copper shorting bar 10, and insert the
buckles into the corresponding holes on the copper shorting bar 10.

Assembling

Completed status

Insulating film

Copper shorting

Buckle

bar 10

Figure 3-7 Attaching the insulating film to the copper shorting bar 10

3. As shown in Figure 3-8, short connect U2, V2 and W2 terminals using the copper shorting bar 7, short connect the PE
terminals of the I/O terminal block of the UPS using the copper shorting bar 10 with insulating film, short connect U3, V3 and
W3 terminals using the copper shorting bar 5, short connect U1 and U2 terminals using the copper shorting bar 6, short
connect N1 and N2 terminals, and two N3 terminals using the two copper shorting bar 4.

Buckle

Assembling

Insulating film

Completed status

Copper shorting

bar 10

28 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Single UPS Installation And Commissioning Liebert NXC

Figure 3-8 3-in 1-out, common source configuration cable connection

4. Connect the copper shorting bar 8 to one end of the copper shorting bar 7 (see Figure 3-8), and connect the live line (input
phase L1) to the copper shorting bar 8.

5. Connect the live lines (input phase L2 and input phase L3), N line and PE line respectively to the I/O terminal block (V1 and
W1 terminals) of the UPS, one screw hole of the copper shorting bar 4 with N1 and N2 terminals, and one screw hole of the
copper shorting bar 10.

6. Connect the output L line, N line and PE line respectively to the copper shorting bar 5, copper shorting bar 4 with two N3
terminals, and the other screw hole of the copper shorting bar 10.

 3-in 1-out, split-bypass configuration

Warning

The factory default of this product is 3-in 3-out, common source configuration. Change the power distribution mode of the main UPS to
3-in 1-out according to the steps described in the following section Changing power distribution mode. Continue the following input and
output power cable connection and power-on commissioning after confirming that the change has been successful.

1. Confirm that the power distribution mode of the main UPS has been changed to 3-in 1-out according to the steps described
in the following section Changing power distribution mode.

2. As shown in Figure 3-7, attach the self-adhesive insulating film (accessory) on the copper shorting bar 10, and insert the
buckles into the corresponding holes on the copper shorting bar 10.

3. As shown in Figure 3-9, short connect the two PE terminals of the I/O terminal block of the UPS using the copper shorting
bar 10 with insulating film, short connect U2, V2 and W2 terminals using the copper shorting bar 7, short connect U3, V3 and
W3 terminals using the copper shorting bar 5, short connect N1 and N2 terminals, and two N3 terminals using the two copper
shorting bar 4.

User Manual 10H52188UM60 - Rev. 2 - 09/2012 29

Liebert NXC Single UPS Installation And Commissioning

Figure 3-9 3-in 1-out, split-bypass configuration cable connection

4. Connect the live lines (input phase L1, L2 and input phase L3), N line and PE line respectively to the I/O terminal block (U1,
V1 and W1 terminals) of the UPS, one screw hole of the copper shorting bar 4 with N1 and N2 terminals, and one screw hole of
the copper shorting bar 10.

5. Connect the copper shorting bar 8 to one end of the copper shorting bar 7 (see Figure 3-9), and connect the live line
(bypass input phase L) to the copper shorting bar 8.

6. Connect the bypass input N line to the copper shorting bar 4 with N1 and N2 terminals of the UPS I/O terminal block.

7. Connect the output L line, N line and PE line respectively to the copper shorting bar 5, copper shorting bar 4 with two N3
terminals, and the other screw hole of the copper shorting bar 10 of the UPS I/O terminal block.

Warning

Before the commissioning engineer arrival, if the load is not ready for accepting the power, please take good care of the safety insulation
located at the end of the output cable.

After the output cable connection, find the label shown in Figure 3-10 on the enclosure of the UPS and put a tick after “AC
OUTPUT” and “BYPASS INPUT” according to the actual situation for ease of maintenance.

Figure 3-10 Label

30 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Single UPS Installation And Commissioning Liebert NXC

Changing power distribution mode

Note

This product is compatible with 3-in 3-out/3-in 1-out, factory default: 3-in 3-out. Change the format according to the following steps if you
need to change the power distribution mode.

 From 3-in 3-out to 3-in 1-out

1. Remove all the copper shorting bars 3 shown in Figure 3-5 of the 3-in 3-out system; connect the main input cables only. It is
prohibited to connect the bypass input cables, output cables and battery cables at this stage, as shown in Figure 3-11.

Figure 3-11 Main input

2. Remove the EPO jumpers of the dry contact port 4 (see Figure 7-2 and 0).

3. Power on the system with MCB QS1. Set the system to ‘Single’ through the LCD menu ‘Settings’ -> ‘3 Phase Output or 1
Phase Output’ (default password: 12345), and power off the system completely, then power on the system again, enter this
menu to confirm the setting is valid.

4. Power off the system completely, and replace the EPO jumpers of the dry contact port 4, and remove the main input cable.
 From 3-in 1-out, to 3-in 3-out

1. Remove all copper shorting bars shown in Figure 3-8 and Figure 3-9 of the 3-in 1-out system, connect the main input cables
only. It is prohibited to connect the bypass input cables, output cables and battery cables at this stage, as shown in Figure
3-11.

2. Remove the EPO jumpers of the dry contact port 4 (see Figure 7-2 and 0).

3. Power on the system. Set the system to ‘Three’ through the LCD menu ‘Settings’ -> ‘3 Phase Output or 1 Phase Output’
(default password: 12345), and power off the system completely, then power on the system again, enter this menu to confirm
the setting is valid.

4. Power off the system completely, replace the EPO jumpers of the dry contact port 4, and remove the main input cable.

3.4.2 Connecting and Installing External Battery

Notes

For the installation and commissioning of an external Battery, refer to “Liebert NXC Battery User Manual”.

User Manual 10H52188UM60 - Rev. 2 - 09/2012 31

Liebert NXC Single UPS Installation And Commissioning

3.5 Single UPS Commissioning

3.5.1 Check Before Power-On

1. Check and confirm that the power distribution mode of the UPS is correct, that the connections of the power cable and
signal cable are correct and there is no short circuit.

2. When using an external Battery, check that the battery installation and the cable connections are correct, and that the
connection cables are connected correctly to the positive and negative battery poles.

3. Measure and confirm that the mains voltage and frequency are normal.

4. The output terminals of the UPS are energized upon the power-on. If the load is connected with the output terminals, make
sure that the power to the load is safe.

3.5.2 Single UPS Parameters Setting

Power on the UPS according to step 1 ~ step 4 in 3.5.3, it is prohibited to start the inverter.

For display setting, press the menu key to enter the function setting option, according to Table 3-4. The other settings can be
done only by service software ParamSet.

Table 3-4 Single UPS parameters setting

Parameters Default value Parameters setting ParamSet

Display
Setting

Single Group Batt Cap 0014 Set the parameter according to the actual battery capacity x

Battery Cells Number 32 Set the parameter according to the actual battery number x

Equalize Charge Allowed Enabled

Set the parameter according to the actual battery
characteristic

x

System Configuration Single Single x

ECO Mode Normal Normal x

Output frencency level 50Hz

Set the parameter according to the actual power grid,
50Hz/60Hz can be selected

x

Output voltage level 400V

Set the parameter according to the actual power grid,
380V/400V/415V can be selected

x

3 Phase Output or 1 Phase
Output

Three

Select “Three” when is 3 Phase Output, select ”Single” when
is 1 Phase Output

x

Note: output frequency level and output voltage level will be active after power-off, but will not be displayed on LCD panel, the settings
will be valid after manual power-off.

The parameter descriptions and default values of the other parameters are listed in Table 3-5; you can set the parameters
according to the actual requirements.

32 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Single UPS Installation And Commissioning Liebert NXC

Table 3-5 Parameter descriptions and default values

Parameters Notes Default value ParamSet

Display
Setting

Display contrast Adjust the LCD contrast x

Date format set M/D/Y, D/M/Y and Y/M/D formats can be selected Y/M/D x

Date & time Set the date and time x

Comm1 baud rate Set the communication baud rate of the USB port 9600 x

Comm2 baud rate For internal communication only, which cannot be set 9600 x

Comm3 baud rate

Set the communication baud rate of the SNMP card
port

9600 x

Communication address For RS485 communication 1 x

Single Group Batt Cap

Set the parameter according to the actual total
battery capacity

0014 x

Battery Cells Number Set total battery number 32 x

Equalize Charge Allowed Enabled or disabled Enabled x

Temp Compensation Enabled or disabled Disabled x

Batt Temp Sensor Position Set the position of the temperature sensor NONE x

Shared Battery

Each UPS in parallel system shares the battery string
or not

Disabled x

System Configuration Set the UPS single/parallel Single x

Parallel Requisite Units Set the parallel units 1 x

Parallel Redundant units Set the redundant units 0 x

ECO Mode Working in the normal mode or ECO mode Normal x

Output Frequency Level Set the output frequency 50Hz x

Output Voltage Level Set the output voltage level 400V x

LBS Function

Set the LBS function, NONE, SLAVE or MASTER can be
selected

NONE x

Command password 12345 12345 x

Protocol Set the UPS communication protocol Velocity x

3 Phase Output or 1 Phase Output Set the output mode: Three or Single Three x

Set “Display contrast”, “Date format set” and “Date & time” according to the actual requirements. For Comm1, Comm2 and
Comm3 baud rate, 1200, 2400, 4800, 9600 or 19200 can be selected. The interface is shown in Figure 3-12.

ITA 016kVA

Settings

Single

Date format set Y/M/D

D/M/Y 　 　M/D/Y　 　　Y/M/D

Date & Time

2010-08-13 15:12:06

ESC

Display contrast

14:30:36

Figure 3-12 Settings interface 1

Set “Single Group Batt Cap” according to the actual total battery capacity, for “Battery Blocks Number”, 30, 32, 34, 36, 38 or
40 can be selected, set “Equalize Charge Allowed”, “Temp Compensation” and “Batt Temp Sensor Position” (battery
temperature sensor is optional) according to the user requirement.

Note

The default value of “Battery Cells Number” is “32”, set the paramerter according to the atcual requirement.

NXC 20kVA

User Manual 10H52188UM60 - Rev. 2 - 09/2012 33

Liebert NXC Single UPS Installation And Commissioning

Select “Enabled” in “Shared Battery” according to whether the battery is shared. Set “System Configuration” to “Single” if the
system is single system. Select “Normal” or “ECO” according to the UPS working mode, select “50Hz” or “60Hz” in “Output
Frequency Level” according to the power grid frequency level.

Set “Output Voltage Level” and “LBS Function” according to the user requirement, set “Command password” to “12345”, the
default value of “Protocol” is “Velocity”, select “Three” or “Single” in “3 Phase Output or 1 Phase Output”, as shown in Figure
3-13.

ITA 016kVA

Settings

Single

YDN23 Velocity

3 Phase Output or 1 Phase Output Three

ESC

YDN23

Protocol

Three Single

14:30:36

Figure 3-13 Settings interface 3

3.5.3 Normal Mode Start-Up

1. Close the UPS output MCB (QS4), the input MCB (QS1) and the bypass MCB (QS2) on by one. The maintenance bypass

MCB (QS3) must be opened.

Warning

After closing the above mentioned MCBs, the UPS output terminal block of the load will be live, pay attention to the personnal safety to
avoid electric shock. Note whether it is safe to feed power to load.

2. LCD displays the self-test screen; the fault indicator (red) and inverter indicator (green) are on at the same time for about 5
seconds. After the self-test, UPS enters the bypass state, the fault indicator turns on and the buzzer beeps for 1 second.

3. The rectifier runs in normal state about 30 seconds, the rectifier start-up is finished.

4. Finish and check the parameter settings of the single UPS.

5. Press the ON button for 2 seconds, the inverter indicator (green) are blinking, the inverter starts, and the inverter indicator
turns on.

6. Measure whether the inverter output voltage is normal.

7. If the battery is not connected, the fault indicator is blinking. If the battery is connected (internal battery with MCB QS6 and
QS7), the fault indicator turns off.

3.5.4 Battery Mode Start-Up

1. Close the battery MCB; press the battery cold start button on the UPS front panel for 2 seconds, the LCD displays the start
screen. The fault indicator (red) will blink and the buzzer will beep continuously after the rectifier finish the start.

2. Press the ON button for 2 seconds, the inverter starts, and the inverter indicator (green) turns on.

34 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Parallel UPS Installation And Commissioning Liebert NXC

Chapter 4 Parallel UPS Installation And Commissioning

This chapter describes the features, requirements, installation and commissioning of the parallel system.

The UPS parallel system provides the user with N + X (2 ≤ N + X ≤ 4) parallel configuration, N stands for the basic parallel sets, X
stands for the redundant sets.

4.1 Features

1. The software and the hardware of each UPS in parallel system are the same as those of the single UPS. The basic parameters
of the parallel system (refer to 4.4.2) and the detailed parameters can be set through the Service Software (for service
engineers only). For all UPS of the parallel system, the requirements of the parameter settings are same.

2. The parallel cables form a ring connection (Refer to 4.3.2 for details) to provide reliability and redundancy for system. The
intelligent parallel logic provides the user with maximum flexibility. For example, each UPS in the parallel system can be
switched off or on in random order; seamless transfer can be achieved between Normal mode and Bypass mode, and the
transfer is automatically recoverable: that is, after the overload condition is removed, the system will return to the original
operation mode automatically.

3. The total load of the parallel system can be queried through the LCD of each UPS.

4.2 Requirements

A UPS system composed of multiple parallel-connected UPS units is equivalent to a large UPS system. Nevertheless, it provides
increased system reliability. To ensure equal utilization of all UPS units and compliance with relevant wiring regulations, the
following requirements must be met:

1. All single UPS must have the same capacity and must be connected to the same bypass source.

2. The bypass input power and rectifier input power must be connected to the same neutral line input terminal.

3. If a residual current detector (RCD) is required, it must be set correctly and installed before the same neutral line input
terminal, or it must monitor the protective earth current of the system. Refer to Safety Manual.

4. The outputs of all single UPS must be connected to the same output bus.

5. As the UPS parallel system is not fitted with any auxiliary contact detection devices for the UPS unit output MCB or
maintenance bypass MCB. Removing the single UPS from the parallel system before maintenance and adding the single UPS
into the parallel system after maintenance must be conducted strictly following the procedures provided in 6.2. Failure to
observe this may affect the load power supply reliability.

4.3 Connecting Power Cables

For each single UPS of the parallel system you need to configure the MCB and cable respectively, refer to 3.4 for the
specification.

4.3.1 Connecting I/O Cables

The UPS power cables are connected to the I/O terminal block of the UPS rear panel, the layout of the I/O terminal block is
shown in Figure 3-4.

Power distribution mode

The I/O cable connections are divided into four types: 3-in 3-out, common source configuration (factory default), 3-in 3-out,
split-bypass configuration, 3-in 1-out, common source configuration, 3-in 1-out, split-bypass configuration. The input and
output cable connection procedures of the four power distribution modes are as follows.

Distribution for the parallel system

User Manual 10H52188UM60 - Rev. 2 - 09/2012 35

Liebert NXC Parallel UPS Installation And Commissioning

The diagram of three UPS parallel system is shown in Figure 4-1. Refer to Power distribution mode in 3.4.1 for the cable
connection of each UPS. Refer to 3.4 for the measurement of the input, output and battery cables.

Qout of allUPS

Rectifier

L1, L2, L3, N

UPS 1 output

Qout UPS1

Supplied by others

Qin
UPS1

Mains input

Qout UPS2

Qin
UPS2

Qout UPS3

Qin
UPS3

Qin Ext

Byp

Qout BYP

L1, L2, L3, N

L1, L2, L3,
N

L1, L2, L3, N

L1, L2, L3,
N

L1, L2, L3

L1, L2, L3, N

L1, L2, L3, N

L1, L2, L3, N

Mains input

Bypass input

Bypass input

Mains input

Bypass
input L1,
L2, L3,N

STS

Inverter

Rectifier

STS

Inverter

Rectifier

STS

Inverter

UPS 2 output UPS 3 outpu t

Output distribution

Figure 4-1 1 + N UPS System with External Maintenance Switch

Note

For 1+N installations, an external bypass rated for the total system load must be installed and the UPS internal maintenance bypass must
be locked to prevent it from being operated.

When planning and installing the system, the power cables between input distribution and the Bypass and rectifier must be
the same length (+/- 10%). The same applies to the power cables between the UPS outputs and the parallel connection point
on the load side.

Warning

Each UPS must configure extenal input MCB and extenal output MCB when carring out the power distribution for the parallel system, as
shown in Figure 4-1. When operating the external Bypass (Qout BYP) refer to 6.2.6.

Changing power distribution mode

This product is compatible with 3-in 3-out/3-in 1-out, factory default: 3-in 3-out.

Carry out the parallel connection after changing the single system to the required system (refer to Changing power
distribution mode in 3.4.1 for the changing method), if you need to change the mode from 3-in 3-out to 3-in 1-out or from
3-in 1-out to 3-in 3-out.

36 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Parallel UPS Installation And Commissioning Liebert NXC

4.3.2 Connecting Parallel Cables

In case of parallel system the optional cable is supplied. The parallel cables form a ring connection through the parallel ports
on the UPS rear panel. The cable connection schematic diagram of 3 + 1 parallel system is shown in Figure 4-2. The first port
on the left is DB9 male port (needle shape), and the second port on the left is DB9 female port (hole shape).

UPS 1

bCmCbBmBbAmAbNmNoN oN oA oB oC

PE PE

UPS 2

bCmCbBmBbAmAbNmNoN oN oA oB oC

PE PE

UPS 3

bCmCbBmBbAmAbNmNoN oN oA oB oC

PE PE

UPS 4

bCmCbBmBbAmAbNmNoN oN oA oB oC

PE PE

DB9 male port

DB9 female port

Figure 4-2 Cable connection schematic diagram of 3 + 1 parallel system

Note

1. The Emerson parallel cables must be used for the parallel system.

2. The parallel communication fault occurs when carrying out the parallel commissioning, check whether the connection of the parallel
cables is correct, and whether the pin1~ pin9 are connected.

Setting parallel addresses

The parallel addresses for all UPS in parallel system should be set. The parallel addresses can be set through the DIP switch on
the UPS front panel (see Figure 1-2). Remove the DIP switch cover, and set the DIP switch according to Table 4-1.

Table 4-1 DIP switch settings

Parallel addresses Parallel 1# Parallel 2# Parallel 3# Parallel 4#

DIP switch position

ON

12345OFF

ON

12345OFF

ON

1 2345OFF

ON

12345OFF

User Manual 10H52188UM60 - Rev. 2 - 09/2012 37

Liebert NXC Parallel UPS Installation And Commissioning

Warning

1. The default setting for DIP switch is ‘1’. However, you should set the DIP switch position for the parallel system according to the
description listed in Table 4-1. Otherwise, the UPS fault will occur.

2. The parallel address must be unique for each UPS unit.

4.3.3 Connecting external Battery Cables

All the UPS in parallel system can either share the batter y strings, or use batter y strings independently.

Note

Each UPS should be equipped with the independent battery MCB. Refer to Table 3-3 for selection of the battery MCB.

Using battery string independently

When each UPS of the parallel system uses the battery string independently, the battery cable connection of each UPS in
parallel system is the same as that of the single UPS, refer to 3.4.2. The schematic diagram of battery strings in 1 + 1 parallel
system when using battery strings independently is shown in Figure 4-3.

Note

Make sure that the LCD settings are correct when using the battery strings independently, refer to 4.4.2 for details.

Figure 4-3 Connection principle diagram upon using battery strings independently

Sharing battery string

Using the shared battery string in parallel system can reduce equipment costs.

Note

To ensure the abundant backup time of the battery, it is recommended to use the external battery cabinet with larger capacity.

1. Wiring

Power off the parallel system completely, disconnect the battery MCBs of all single UPS, and then use battery cables (refer to

3.4 for the cables and the MCBs) to connect ‘+’, ‘N’, ‘-’ and ‘PE’ terminals of the battery string respectively to ‘Bat +’, ‘Bat N’,

38 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Parallel UPS Installation And Commissioning Liebert NXC

‘Bat -’ and ‘PE’ terminals of the corresponding UPS I/O terminal block in parallel system through each battery MCB, as shown
in Figure 4-4.

PE

UPS 1 UPS 2

UPS 1 MCB

UPS 2 MCB

＋－ PE

Positive batte ry
string

＋－ PE

Bat＋ Bat N Bat－ Bat＋ Bat N Bat－ PE

Negative battery string

Figure 4-4 Connection diagram of shared battery string in 1 + 1 parallel system

Refer to Figure 4-5 to configure the positive battery string and negative battery string

Figure 4-5 Internal connection diagram for positive battery string and negative battery string

2. Setting

Power on the system, set each single UPS to shared battery string configuration through the Service Software ‘Settings’ ->
‘Shared Battery’ from each UPS unit; set the Service Software ‘Settings’ -> ‘Battery Cells Number’ and ‘Single Group Batt Cap’
from each UPS unit, and each UPS unit setting must be the same.

Note

1. For the parallel system used the shared battery strings, make sure that the

Service Software

settings are correct. Refer to 4.4.2 for

details of the settings.

2. For the parallel system used the shared battery strings, the ‘Single Group Batt Cap’ on the

Service Software

setting of each UPS stands

for the total capacity of battery strings, and each UPS can calculate the battery capacity itself automatically.

3. Close the battery MCB of each UPS.

first Block

second Block

third Block

sixteen Block

Battery string

Bat+

Bat-

PE

Battery cabinet

User Manual 10H52188UM60 - Rev. 2 - 09/2012 39

Liebert NXC Parallel UPS Installation And Commissioning

4.4 Commissioning Parallel System

4.4.1 Check Before Power-On

1. Check and confirm that the power distribution mode of the UPS is correct; that the connections of the power cables and
signals cable are correct and there is no short circuit.

2. Check that the battery installation and cable connection is correct and there is no short circuit, and that the positive pole
and negative pole of the battery is correct. Especially when each UPS of the parallel system shares battery string, check these
items carefully.

3. Check all the working status of the parallel system, ensure that the phase sequence of the mains, bypass and output of each
UPS is correct and consistent, that the parallel cable connection is reliable, and that the user load is not connected during
power-on.

4. Measure and confirm that the mains voltage and frequency is normal.

5. The output terminals of the UPS are energized upon the power-on. If the load is connected with the output terminals, make
sure that the power to the load is safe.

Warning

The UPS will be live upon the power-on. When the bypass of the single unit in the parallel system is not consistent, a system fault may
occur, check and confirm the bypass before power-on.

4.4.2 Parallel System Parameters Setting

The parallel parameters for all the UPS units in parallel system should be set.

Power ON the each UPS of the parallel system according to step 1) ~ step 4) in 4.4.3, it’s prohibited to start the inverter. Set
the parallel parameters according to Table 4-2.

Table 4-2 Parallel parameters setting

Parameters Default value Parallel parameters setting ParamSet

Display
Setting

Single Group Batt Cap 0014 Set the parameter according to the actual battery capacity x

Battery Cells Number 32 Set the parameter according to the actual battery number x

Equalize Charge Allowed Enabled

Set the parameter according to the actual battery
characteristic

x

Shared Battery Disabled

Select “Enabled” if there is shared battery, select “Disabled”
if there is no shared battery

x

System Configuration Single Parallel x

Parallel requisite units 1

Set the paramerter to “3” if there are four UPS to form 3 + 1
parallel system

x

Parallel Redundant Units 0

Set the paramerter to “1” if there are four UPS to form 3 + 1
parallel system

x

ECO Mode Normal Normal x

Output frencency level 50Hz

Set the parameter according to the actual power grid,
50Hz/60Hz can be selected

x

Output voltage level 400V

Set the parameter according to the actual power grid,
380V/400V/415V can be selected

x

3 Phase Output or 1 Phase
Output

Three

Select “Three” when is 3 Phase Output, select ”Single”
when is 1 Phase Output

x

Note: output frequency level and output voltage level will be active after power-off, but will not be displayed on LCD panel, the settings
will be valid after manual power-off.

The default values of other parameters are listed in Table 3-4.

For the parallel system with N + X (2 ≤ N + X ≤ 4), set ‘System Configuration’ to ‘Parallel’, ‘Parallel requisite units’ to ‘N’ (1 ≤ N ≤

4), ‘Parallel Redundant Units’ to ‘X’ (0 ≤ X ≤ 3). Take the 3 + 1 parallel system for example, set ‘System Configuration’ to
‘Parallel’, ‘Parallel requisite units’ to ‘3’, ‘Parallel Redundant Units’ to ‘1’.

40 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Parallel UPS Installation And Commissioning Liebert NXC

4.4.3 Power-On Commissioning For Parallel System

Power on and commission each UPS of the parallel system respectively, namely power on one UPS at a time, and other UPS are
in the powered- down status, the specific commissioning procedures are as follows:

1) Close the external output MCB and input MCB of one UPS, the UPS is powered on. Ensure that other UPS MCBs are opened.
Close the corresponding internal input Output Circuit Breaker, bypass MCB and output MCB of the UPS.

Warning

After closing the UPS external output MCB and UPS internal output MCB, the UPS output terminal block, the distribution output terminals
and load will be live, pay attention to the personnal safety to avoid electric shock. Note whether it is safe to feed power to load.

2) LCD displays the self-test screen; the fault indicator (red) and inverter indicator (green) are on at the same time for about 5
seconds. After the self-test, UPS enters the bypass mode, the fault indicator turns on and the buzzer beeps for 1 second.

3) After about 30 seconds the rectifier start-up is finished and the rectifier runs in normal mode.

4) Finish and check the parallel parameter settings.

5) Press the ON button for 2 seconds, the inverter indicator (green) is blinking, the inverter starts, and the inverter indicator
turns green.

6) If the battery is not connected, the fault indicator is blinking. If the battery is connected, the fault indicator turns off.

7) If the UPS is working normally, turn off the UPS.

8) Repeat the preceding step 1) ~ step7) to power on and commission the other UPS respectively.

Note

Carry out the parallel commissioning after each UPS is working normally.

Confirm that each UPS has been powered on and working normally, commission the parallel system, the specific procedures
are as follows:

1) Close the external output MCB and input MCB and the corresponding UPS internal MCBs of one UPS. The UPS is powered on
and enters Bypass mode. The rectifier starts. Press the ON button for 2 seconds, the inverter indicator turns on. Measure
whether the inverter output voltage is normal.

2) Close the external output MCB and input MCB and the corresponding UPS internal MCBs of the second UPS. Follow the
preceding steps to start the inverter of the second UPS, check whether there is any alarm on the LCD, and confirm that the
UPS parallel works normally.

3) Follow the methods to start up the inverter of the third or fourth UPS to connect the UPS into the parallel system.

Waring

During the parallel system power-on, confirm that the external output MCB of each UPS has been closed, and that all the inverter outputs
of the UPS are connected in parallel.

4.5 Installation And Commissioning For Double Bus System with common

neutral

4.5.1 Introduction

The double bus system consists of two independent UPS systems; each UPS system consists of one single UPS, or two or more
parallel-connected UPS.

The double bus system has high reliability, which is suitable for the load with dual input terminals. For single UPS input load,
you can add a static transfer switch (STS, optional) and enable the standard Load Bus Synchronization (LBS) system.

Place the UPS side by side, and connect the UPS as follows:

User Manual 10H52188UM60 - Rev. 2 - 09/2012 41

Liebert NXC Parallel UPS Installation And Commissioning

The double bus system uses the LBS system to realize the output synchronization of the two independent (or parallel) UPS
systems. One is the master system, and the other is the slave system. The operation mode of the double bus system contains
master system and/or slave system running in normal mode or bypass mode. The schematic diagram of the LBS system
consisting of 1 + 1 parallel system is shown in Figure 4-6.

UPS 1

Bypass

Bypass input

Main input

UPS 2

UPS 3

UPS 4

Output

LBS cable

Parallel cable

Connect to load

STS

Bypass input

Main input

Main

Bypass
Main

Bypass
Main

Bypass
Main

Output

Output

Parallel cable

Output

Note: UPS1 and UPS2 are master systems, UPS3 and UPS4 are slave systems

Figure 4-6 LBS system schematic diagram

Note

For the DIP switch settings and the parallel commissioning, refer to 4.3.2 and 4.5 respectively.

4.5.2 Installing External Protective Device

See 3.3 for details of installation and type selection.

4.5.3 Connecting Power Cables

In double bus system, refer to 3.4 and 4.3 to select the power cables for single UPS and parallel system respectively. The
bypass input power and mains input power must use the same neutral input terminal. The leakage current protective device
should be installed before the input terminal.

4.5.4 Connecting LBS Cables

In double bus system, connect the two ends of the LBS cable to any LBS port of the two parallel systems respectively, as shown
in Figure 4-7. The third port on the left is DB9 male port (needle shape), the fourth port on the left is DB9 female (hole shape).

Note

1. The appearances of the LBS ports (see Figure 1-3) and the parallel ports (see Figure 1-3) are the same, but the positions are different. Be
careful when inserting and connecting to avoid incorrect connnection.

2. For the double bus system formed by parallel UPS, it is recommended to prepare two LBS cables, one is used to connect any of the two
LBS ports of the two parallel system, the other is redundant cable which is used for reliable connection.

3. As shown in Figure 4-7, one cable is LBS cable, others are parallel cables.

42 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Parallel UPS Installation And Commissioning Liebert NXC

UPS 1

bCmCbBmBbAmAbNmNoN oN oA oB oC

PE PE

UPS 2

bCmCbBmBbAmAbNmNoN oN oA oB oC

PE PE

UPS 3

bCmCbBmBbAmAbNmNoN oN oA oB oC

PE PE

UPS 4

bCmCbBmBbAmAbNmNoN oN oA oB oC

PE PE

DB9 male port

DB9 female port

LBS cable

DB9 male port

DB9 female port

Figure 4-7 LBS cable connection

4.5.5 Setting up the Double Bus System parameters

Using the double bus system formed by 1 + 1 parallel system as an example, set ‘System Configuration’ to ‘Parallel’, ‘Parallel
requisite units’ to ‘1’, ‘Parallel Redundant Units’ to ‘1’. For the master system, set ‘LBS Function’ to ‘MASTER’. For the slave
system, set ‘LBS Function’ to ‘SLAVE’. Ensure that the setting for ‘3 Phase Output or 1 Phase Output’ of each single UPS in the
double bus system is same, as shown in Figure 4-8.

ITA 016kVA

Settings

Unit 1#

YDN23 Velocity

3 Phase Output or 1 Phase Output Three

ESC

YDN23

Protocol

Three Single

14:30:36

Figure 4-8 Setting interface

DB9 male port

DB9 female port

UPS 1

UPS 2

UPS 3

UPS 4

LBS cable

DB9 male port

DB9 female port

User Manual 10H52188UM60 - Rev. 2 - 09/2012 43

Liebert NXC Operation And Display Panel

Chapter 5 Operation And Display Panel

This chapter introduces the functions and use of the components on the UPS operation and display panel, and provides LCD
display information, including the LCD screen types, detailed menu messages, prompt windows message and UPS alarm list.

5.1 Introduction

The operation and display panel is located on the front panel of the UPS. Through the operation and display panel, you can
conduct the UPS operation control and query UPS parameters, UPS and battery states, and alarm message.

As shown in Figure 5-1, the operation and display panel provides LCD, menu buttons (F1 ~ F4、HELP)、LED indicators (inverter

indicator and fault indicator ), control buttons (FAULT CLEAR, ON, OFF, ALARM CLEAR, EPO).

Figure 5-1 Operation and display panel

5.1.1 LED Indicators

The LED indicators are composed of inverter indicator and fault indicator. Table 5-1 gives the indicators description.

Table 5-1 Description of LED indicators

Indicator Color State Meaning

Inverter indicator Green

On Load power is supplied by the inverter

Blinking Inverter on, starting up, synchronizing, or standing by (ECO mode)

Off Inverter not operating

Fault indicator Red

Blinking General fault (such as no battery)

On Serious fault (such as inverter fault)

Off No fault

5.1.2 Audible Alarm (Buzzer)

The UPS activity is accompanied with the following two different kinds of audible alarms shown in Table 5-2.

Table 5-2 Audible alarm description

Sound Meaning

One beep every second Sound is generated when the UPS alarm appears, such as AC input failure

Continuous beep Sound is generated when the UPS fault appears, such as fuse or hardware failure

LCD

Menu buttons

Control buttons

Fault indicator

Inverter indicator

44 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Operation And Display Panel Liebert NXC

5.1.3 Control Buttons

The operation and display panel provides five control buttons, the functions of which are described in Table 5-3.

Table 5-3 Description of control buttons

Control button Silk print Description

EPO switch EPO

Used to disconnect the load power and close the rectifier, inverter, static bypass
and battery

Inverter on ON Used to start the inverter

Inverter off OFF Used to stop the inverter

Fault recovery on/off FAULT CLEAR Restore the UPS function (clear fault in advance)

Alarm sound silence on/off ALARM CLEAR

When an audible alarm is active, press this button to silence the audible alarm.
Press this button again can restart the buzzer

5.1.4 LCD And Menu Buttons

The operation and display panel is composed of an LCD and five menu buttons (F1, F2, F3, F4, HELP). Table 5-4 gives the menu
buttons function description.

Table 5-4 Menu buttons function description

Button F1 F2 F3 F4 HELP

Function 1

HOME

ESC

Escape

Left

Right

Enter

Function 2

Up

Down

LCD provides you with the user-friendly interface and the 320 × 240 dot matrix image display. The menu-driven LCD allows
you to easily browse through the input, output, load and battery parameters, learn about the current UPS status and alarm
message, perform functional setting and control operation. The LCD also stores up to 512 historical alarm records that can be
retrieved for reference and diagnosis.

5.2 LCD Screen Types

5.2.1 Start Screen

Upon UPS start, the UPS executes the system self-test, and the start screen will appear and remain about 15 seconds, as
shown in Figure 5-2.

F1

F2 F3 F4

HELP

Figure 5-2 Start screen

User Manual 10H52188UM60 - Rev. 2 - 09/2012 45

Liebert NXC Operation And Display Panel

5.2.2 Primary Screen

After the UPS system self-test, the primary screen shown in Figure 5-3 will appear. The primary screen is composed of four
windows: system information window, data window, menu window and keypad window.

ITA 016kVA

14：30：36

Output

F1

F2 F3 F4

HELP

Unit 1#

A（AB） B（BC） C（CA）

= =〉

L-N voltage (V) 0.0 0.0 0.0
L-N current (A) 0.0 0.0 0.0
Frequency (Hz) 0.00 0.00 0.00
L-L voltage (V) 0.0 0.0 0.0

Power factor 0.00 0.00 0.00

System
information
window

Data window

Menu window

Keypad window

Figure 5-3 Primary screen

The current icons on top of the F1 ~ F4 and HELP menu buttons give the explanations of each button. From any menu in the
primary screen, pressing the F1 button will return to the ‘Output’ menu. For details about the primary screen, refer to 5.3.

5.2.3 Default Screen

During the UPS operation, if there is no alarm within 2 minutes, the default screen shown in Figure 5-4 will appear. After a
short while, the LCD backlight will turn off. Press any menu button (F1 ~ F4, HELP), the primary screen will appear again.

Figure 5-4 Default screen

NXC 20kVA

46 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Operation And Display Panel Liebert NXC

5.3 Detailed Description Of Menu Items

The description in the following refers to the LCD primary screen shown in Figure 5-3.

System information window

The system information window displays the current time and the UPS name. This window is purely for information - no
settings are adjustments are made here. For details, see Table 5-5.

Table 5-5 System information window

Item Explanation

Liebert NXC 020kVA UPS name, which stands for Liebert® Liebert NXC 20kVA UPS

12: 30: 36 Current time (format: 24 Hours, h: min: s)

Menu window and data window

The menu window displays the menu name of the data window. The data window displays the items of the menu selected
from the menu window. UPS parameters can be browsed and functions can be set through the menu window and data
window. Details are given in Table 5-6.

Table 5-6 Menu window and data window

Menu Item Explanation

Mains

L-N voltage (V) Phase voltage

L-N current (A) Phase current

Frequency (Hz) Input frequency

L-L voltage (V) Line voltage

Power factor Power factor

Bypass

L-N voltage (V) Phase voltage

Frequency (Hz) Bypass frequency

L-L voltage (V) Line voltage

Output

L-N voltage (V) Phase voltage

L-N current (A) Phase current

Frequency (Hz) Output frequency

L-L voltage (V) Line voltage

Power factor Power factor

Load

Sout (kVA) Sout: Apparent power

Pout (kW) Pout: Active power

Qout (kVAR) Qout: Reactive power

Load level (%) The percentage of the UPS rated load

Crest factor Output current crest factor

System

Sout (kVA) Sout: Apparent power

Pout (kW) Pout: Active power

Qout (kVAR) Qout: Reactive power

Battery

Battery voltage (V) Battery bus voltage

Battery current (A) Battery bus current

Battery temperature (°C) Battery temperature (°C)

Battery remain time (Min.) Battery runtime remaining

Battery boost charging Battery is boost charging

Battery float charging Battery is float charging

Battery is not connected Battery is not connected

Event Current alarm Display the current alarm. See Table 5-8 for UPS alarm message list

Records Historical alarm Display all historical alarms. See Table 5-8 for UPS alarm message list

Language Language selection

Options are displayed in 13 languages: Swedish, Spanish, Russian, Chinese,
Portuguese, Polish, Italian, German, French, English, Dutch, Czech, and Turkish

User Manual 10H52188UM60 - Rev. 2 - 09/2012 47

Liebert NXC Operation And Display Panel

Menu Item Explanation ParamSet

Display
Setting

Settings

Display contrast Adjust the LCD contrast x

Date format set

MM DD YYYY, DD MM YYYY and YYYY MM DD formats can be
selected

x

Date & time Set the date and time x

Comm1 baud rate Set the communication baud rate of the USB port x

Comm2 baud rate For internal communication only, which cannot be set x

Comm3 baud rate Set the communication baud rate of the SNMP card port x

Communication address For RS485 communication x

Single Group Batt Cap Set the total battery capacity according to the configuration x

Settings

Battery blocks Number

Set the battery block. Option: 30- block, 32- block, 34- block, 36­block, 38- block, 40- block

x

Equalize Charge Allowed Enabled or disabled x

Temp Compensation Enabled or disabled x

Temp Sensor Position Set the position of the temperature sensor x

Shared Battery Each UPS unit in parallel system shares the battery string or not x

System Configuration Set the UPS single/parallel x

Parallel Requisite Units Set the parallel units x

Parallel Redundant units Set the redundant units x

ECO Mode Set the operation mode. Option: Normal, ECO x

Output Frequency Level Set the output frequency x

Output Voltage Level Set the output voltage level x

LBS Function Set LBS function. Option: NONE, SLAVE or MASTER x

Command password You can change the command password. Default: ‘12345’ x

Protocol Set the communication protocol of the UPS x

3-in 3-out/3-in 1-out

Set the output system: 3-in 3-out or 3-in 1-out
This setting can only be carried out after the EPO operation. After
the setting, you must power off the system, and confirm that the
system actual wiring mode complies with the setting. Power on
the system again, and the setting can take effect

x

Command

Battery maintenance test

The battery maintenance test will partly discharge the battery to get rough assessment of

the battery capacity. The load ranges from 20% to 100%

Battery capacity test

The battery capacity test will completely discharge the battery to get accurate assessment of

the battery capacity. The load ranges from 20% to 100%

System test

The UPS self-test. The user starts this function, 5 seconds later, a pop window will appear to

show the test result

Stop testing Manually stop the test, including the maintenance test, capacity test and system test

Forcing charge Manually conduct the battery forcing charge

Stop forcing charge Manually stop the battery forcing charge

Version

Monitor Version Provide the monitor software version

Rectifier Version Provide the rectifier software version

Inverter Version Provide the inverter software version

Keypad window

The function of menu buttons (F1 ~ F4 and HELP) is shown in icon mode for the current display screen (see
Figure 5-4).

48 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Operation And Display Panel Liebert NXC

5.4 Prompt Window

A prompt window is displayed during the operation of the system to alert you to certain conditions and/or to require your
confirmation of a command. The prompts and meanings are given in Table 5-7.

Table 5-7 Prompts and meanings

Prompt Meaning

Transfer with interrupt, confirm or cancel

Inverter and bypass supplies are not synchronized, and the load transfer between the
bypass and inverter will cause a brief power supply interruption

This operation leads to output shutdown,
confirm or cancel

The bypass is abnormal, inverter shutdown will cause the load power-off

Turn on more UPS to carry current load

The number of paralleled inverters already turned on is insufficient to carry the current
load, thus more inverters are required

Battery will be depleted, confirm or cancel

The battery maintenance test discharges the battery completely. A prompt screen will
appear to require your confirmation. Cancelling the test will end the battery discharge
and return to the Normal mode

System self-test finished, everything is ok No operation is required

System self-test finished, please check the
current warnings

Check the current alarm message

Enter control password Control password is required for battery test or UPS test

Battery self-test condition is low, please check
battery state and load level

Battery test condition is not met. Please check whether the battery is in boost charge
state and the load level is more than 20%

Forcing charge condition is low, please check
battery state

The prompt appears when you select the forcing charge command while the forcing
charge condition is not met (such as no battery, charger failure)

Check the wiring according to the settings,
power-off takes effect, 3-phase (1-phase)
output

After the menu ‘3 Phase Output or 1 Phase Output’ is set, you can power off the system
completely, and then power on the system again after the wiring is changed according
to the settings

5.5 UPS Alarm Message List

Table 5-8 gives the UPS alarm message list based on the ‘Event’ and ‘Records’ menus.

Table 5-8 UPS alarm message list

Alarm message Description

Inverter comm. fail Internal communication failure between the monitoring board and the inverter

Rectifier comm. fail Internal communication failure between the monitoring board and the rectifier

Parallel comm. fail

The communication failure between different UPS within a parallel system.

1. Check if there are some UPS not powered on in parallel system. If so, power on these UPS and check if the
alarm disappears.

2. Press the FAULT CLEAR button

Battery fault Battery is depleted (reserved)

Battery replaced Battery test failure, and the battery should be replaced

Battery low
pre-warning

Before the end of the discharge, battery undervoltage pre-warning may occur. After this pre-warning, the
battery should have the capacity for 3 minutes discharging with full load. The time is user-configured ranging
from 3 minutes to 60 minutes. Shut down the load in time

Battery stop discharge Inverter is off due to the battery end voltage. Check the mains failure and try to recover it

Mains volt. abnormal

Mains voltage exceeds the upper or lower limit and results in rectifier shutdown. Check the input phase voltage
of the rectifier

Mains undervoltage Mains is undervoltage, reduce load to keep running. Check the input line voltage

Mains freq. abnormal Mains frequency is out of the limit range and results in rectifier shutdown. Check the input frequency

Rectifier block Rectifier failure. The rectifier shuts down and the battery discharges

Rectifier overtemp.

The temperature of heat sink is too high to keep the rectifier running. The UPS can recover automatically. Check
the environment and ventilation

Battery charger fault Battery charger is over voltage

Control power 1 fail UPS operates but the control power is not available

Mains phase reversed AC input phase sequence is reversed

Rectifier overcurrent Rectifier is over current

Soft start fail Rectifier cannot start due to the DC bus low voltage

User Manual 10H52188UM60 - Rev. 2 - 09/2012 49

Liebert NXC Operation And Display Panel

Alarm message Description

Bypass unable to trace

This alarm is triggered by an inverter software program when the amplitude or frequency of bypass voltage is
beyond the normal range. The amplitude threshold is fixed at ±10% of nominal rating.
This alarm will automatically recover when the bypass voltage is normal.

1. First verify that the bypass voltage and frequency displayed on the LCD are within the selected range. Note
that the rated voltage and frequency are specified by the ‘Output Voltage Level’ and ‘Output Frequency Level’
respectively.

2. If the displayed voltage is abnormal, please verify the actual bypass voltage and frequency presented to the
UPS. Check the external power if any fault is found

Bypass protection

This alarm is triggered by an inverter software program when the amplitude or frequency of bypass voltage is
too high or too low. The amplitude threshold is fixed at ±10% of nominal rating. This alarm will automatically
recover when the bypass voltage is normal.

1. First check if there are some relevant alarms, such as ‘Bypass Phase Reverse’, ‘Input Disconnect Fault’. If so,
solve them first.

2. Then verify that the bypass voltage and frequency displayed on the LCD are within the selected range. Note
that the rated voltage and frequency are specified by the ‘Output Voltage Level’ and ‘Output Frequency Level’
respectively.

3. If the displayed voltage is abnormal, please verify the actual bypass voltage and frequency presented to the
UPS. Check the external power if any fault is found. If the utility is likely to trigger this alarm frequently, the
bypass limit can be increased through the configuration software according to the user feedback

Inverter asynchronous

This alarm is triggered by an inverter software program when the inverter and bypass waveforms are misaligned
by more than 6 degrees in phase. The amplitude threshold is fixed at ±10% of nominal rating. This alarm will
recover automatically when the alarm condition disappears.

1. First check if the alarm ‘Bypass Unable To Trace’ or ‘Bypass Protection’ exits. If so, solve it first.

2. Verify the waveform of the bypass voltage. If too distorted, ask the user to verify it and seek any possible
measurement

Inverter fault Inverter output voltage beyond limits. Load transfers to bypass

Inverter overtemp.

The temperature of the inverter heat sink is too high to keep the inverter running. This alarm is triggered by the
signal from a temperature monitoring thermostat on the inverter bridge heat sink. The alarm is cleared after
about 20 minutes, the inverter will start again automatically. The UPS will switch to bypass if the alarm is
triggered more than one time in 2 hours, and a manual power-on of the UPS is required to stitch back to
inverter working state after the alarm is cleared. Note: Wait for 20 minutes after the alarm is cleared, then
manual power-on will be suceesful.

1. high ambient temperature

2. blocked cooling airway

3. any fan failure

4. prolonged inverter overload

Fan fault At least one of the cooling fans has failed

Inverter relay fail

At least one of the relays of inverter side is open or short circuit. This fault is latched until power off (for a 3-in
1-out system, possible causes for relay fault type: inverter fuse open, inverter IGBT open)

Bypass STS fail At least one of the static switches of bypass side is open or short circuit. This fault is latched until power off

Operation invalid Incorrect operation

Neighbour bypass STS
fail

At least one of the bypass static switches of a UPS unit in parallel system is open or short circuit. This fault is
latched until power off

Output fuse fail At least one inverter output fuse failure. The inverter shuts down, the load transfers to bypass

Unit over load

The UPS is confirmed to be overloaded when the load is above 105% nominal rating. The alarm automatically
recovers after the overload condition is removed.

1. Confirm that the alarm is true by checking the load percentage indicated on the LCD to determine which
phase is being overloaded.

2. If the alarm is true, measure the actual output current to verify that the indications are valid. Disconnect the
unnecessary load if possible.

Byp. abnormal
shutdown

Both bypass and inverter voltages are abnormal. Load interruption

Inverter over current Inverter pulse width modulation module is over current

Bypass phase reverse

The phase sequence direction of the bypass voltage is reversed. Normally, the phase of phase B lags 120
degrees behind phase A, and the phase of phase C lags 120 degrees behind phase B.
Verify that the phase rotation of the bypass supply presented to the UPS is correct, and rectify it if the fault is
found

50 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Operation And Display Panel Liebert NXC

Alarm message Description

Load impact transfers
bypass

A transfer to bypass occurred due to a large step load. The UPS will recover automatically. Turn on the load in
sequential order to reduce the step load of the inverter

Transfer time-out

The load is on bypass power due to the excessive number of transfers that occurred within the last hour. The
UPS will recover automatically and will transfer the load to inverter power within an hour

Bus abnormal DC bus voltage is abnormal. Inverter shuts down. Load transfers to bypass

DC bus over voltage

Rectifier and inverter are off because the DC bus voltage is too high. Check whether there is a fault in rectifier
side. If not, check whether there is an overload. After recovering the fault, restart the inverter

Bypass over current Bypass current is over limit above 135% rating. The UPS just alarms without any action

Setting save error Historical records are not saved (Reserved)

Input Disconnect Fault AC mains input neutral line is not checked out

Protocol version clash Firmware incompatibility between monitor board and Digital Signal Processor (DSP) board

Manual on Manually turn on the inverter through pressing ON on the operation and display panel

Manual off Manually turn off the inverter through pressing OFF on the operation and display panel

EPO Press the EPO button directly or receive the external EPO command

Transfer confirm Prompt to press the Enter button to acknowledge that an interrupted load transfer to bypass will happen

Transfer cancel Prompt to press the ESC button to avoid that an interrupted load transfer to bypass will happen

Fault clear Press FAULT CLEAR

Alarm silence Press ALARM CLEAR

Turn on fail

Inverter failed to turn on manually. The reason may be the invalid operation (maintenance bypass breaker
closed), or DC bus or rectifier not ready

Alarm silence cancle Press FAULT CLEAR or ALARM CLEAR

Bypass mode The UPS is in Bypass mode

Normal mode The UPS is in Normal mode

Battery mode The UPS is in Battery mode

Check UPS output

1. Whether the EPO terminal is on the dry contact port 4

2. Whether the LCD displays “Parallel comm. Fail”

Battery float charging Battery status (floating charge mode)

Battery boost charging Battery status (boost charge mode)

Battery discharging Battery status (discharge mode)

Battery period testing Automatic periodic battery maintenance test (20% capacity discharge)

Batt. capacity testing User initiated battery capacity test (100% capacity discharge)

Batt. maint. testing User initiated maintenance test (20% capacity discharge)

UPS system testing User initiated UPS system self-test

Inverter in setting Inverter is starting up and synchronizing

Rectifier in setting Rectifier is starting up and synchronizing

Battery reverse Reconnect the battery, and check the battery wiring

No battery Check the battery and battery wiring

Auto start

UPS is off when the battery discharges completely, the inverter will automatically start after the mains is
restored

REC FLASH UPDATE Ongoing update of rectifier firmware

INV FLASH UPDATE Ongoing update of inverter firmware

MONITOR FLASH
UPDATE

Ongoing update of monitor firmware

DSP software error Inverter software does not match the rectifier software

Operation invalid and
Bypass unable to trace

Alarm combination, when the two alarms appear at the same time, the UPS I/O cable connection mode is not
suitable with the setting mode (3-in 3-out or 3-in 1-out)

Note:
If the alarm is caused through setting the software value by Emerson authorized engineer, and you wish to change the setting values,
please get in touch with the Emerson local customer service center

User Manual 10H52188UM60 - Rev. 2 - 09/2012 51

Liebert NXC UPS Operation Instructions

Chapter 6 UPS Operation Instructions

This chapter gives a detailed description of the UPS operation procedures.

During the operation, the buzzer alarm may appear, at this point, you can press the ALARM CLEAR button to silence the
audible alarm.

Warning: hazardous mains and/or battery voltage exists behind the protective cover

No customer operation parts are located behind the protective covers that require a tool for removal.
Only qualified service personnel are authorized to remove such covers.

6.1 UPS Start-Up

The start-up procedures can be performed after the installation is finished, the system has been commissioned by authorized
engineer and the external input MCBs are closed.

Warning

This procedure results in mains voltage being applied to the UPS output terminals. Confirm that the load power is safe, if there is a load to
be connected with the UPS output terminal. Ensure that the load is isolated from the UPS output terminals if the load is not ready for
accepting the power.

The start-up mode of the single UPS includes normal mode start-up and battery mode start-up; refer to 3.5.3 and 3.5.4 for
details.

For the detailed information of the parallel UPS, refer to 4.4.3.

6.2 Transfer Procedures Between Operation Modes

Note

The Inverter operation mode include Normal mode (mains inverter) and Battery module (battery inverter).

6.2.1 Transfer From Normal Mode To Battery Mode

In the event of mains failure, the UPS will transfer to Battery mode. If you wish to transfer the UPS from Battery mode to
Normal mode, you should wait few seconds for mains input recovery. 10 seconds later, the rectifier will restart automatically,
and the rectifier will restore the power.

6.2.2 Transfer From Inverter Mode To Bypass Mode

In Inverter mode, press the OFF button for 2 seconds, you can transfer the UPS to Bypass mode.

Note

In Bypass mode, the load accepts the power not from the pure power generated by the inverter, but from the mains power directly.

For the detailed information of the Normal mode, Bypass mode, Battery and Maintenance Bypass mode, please refer to 1.5.

6.2.3 Transfer From Bypass Mode To Inverter Mode

In Bypass mode, press the ON button for 2 seconds. After the inverter runs in normal state, the UPS transfers to Normal mode.

6.2.4 Transfer From Inverter Mode To Maintenance Bypass Mode

When the UPS is running in Normal mode, you can use this procedure to make the load transfer from inverter output to
maintenance bypass.

52 User Manual 10H52188UM60 - Rev. 2 - 09/2012

UPS Operation Instructions Liebert NXC

Caution

Before performing this procedure, you should check the LED information first, and make sure the bypass is normal and inverter
synchronized. Otherwise, it may result in the load power interruption for a while.

1. Press the OFF for 2 seconds.

The inverter indicators are off and the buzzer alarms. The load transfers to the static bypass, and the inverter shuts down.

Note

Press the ALARM CLEAR button can silence the alarm, but the alarm message of the the LCD does not disappear until the alarm status is
cleared.

2. Close the maintenance bypass MCB (QS3) on the UPS rear panel, and the maintenance bypass can supply power to the load.

Warning

If you wish to maintain the UPS module, open the battery MCB QS6 and QS7, and you should wait 10 minutes for the internal DC bus
capacitance voltage discharging.

3. Disconnect the main/bypass input switch and output switch (MCB QS1, QS2 and QS4)

Caution

1. When the UPS is in Maintenance Bypass mode, the load does not have the mains abnormal protection.

2. After the UPS transfers to the maintenance bypass, the UPS is not in operation, and the LCD is not displayed, and only the user terminal
block is electrified. Be careful when removing the UPS module for maintainance.

6.2.5 Transfer From Maintenance Bypass Mode To Inverter Mode

After UPS maintenance, you can use this procedure to transfer the load from the maintenance bypass to the inverter.

Warning

As no auxiliary contact information of the maintenance bypass MCB QS3 is introduced into the UPS, UPS operation restoration after
maintenance must be done strictly following this procedure. Failure to observe this may cause damage to the equipment.

1. Close the output MCB QS4 on the rear panel of the UPS.

2. Close the mains input MCB QS1 and bypass input MCB QS2 on the rear panel of the UPS.

3. Wait until the UPS starts to operate in Bypass mode, and open the maintenance bypass MCB QS3 on the rear panel of the
UPS.

4. Press the ON button on the operation and display panel of the UPS, and the UPS transfers to Inverter mode.

6.2.6 Operation with the external Maintenance Bypass in parallel systems

Refer also to Figure 4-1.

In parallel UPS systems, the internal maintenance bypass switches QS3 must be switched off and locked in this position.

Ensure that all the internal bypass switches (STS) are in “ON” status ( check status on displays) before switching the
maintenance bypass switch (“Qout BYP) on.

There is no interruption in the power supply to the load.

Ensure that all the internal bypass switches (STS) are in “ON” status ( check status on displays) before switching the
maintenance bypass switch (“Qout BYP) off.

There is no interruption in the power supply to the load.

To disconnect the load, switch off the “Qout of all UPS” switch, followed by the external maintenance bypass switch.

User Manual 10H52188UM60 - Rev. 2 - 09/2012 53

Liebert NXC UPS Operation Instructions

6.3 UPS Complete Shutdown

If you need to shut down the UPS completely, transfer the UPS from Inverter mode to Maintenance Bypass mode according to
the procedures in 6.2.4, so as not to effect the load during the UPS power-off. Then if the power to the load is not needed,
open the maintenance bypass MCB directly, as shown in Figure 6-1.

Figure 6-1 Configuration of the UPS with external maintenance bypass

In the case of UPS installation that use the customer's power distribution system, to isolate the UPS from AC power, it is
necessary to open the external input MCB. (If the mains and bypass are independently powered, close the two input MCBs).

Caution

Open the maintenance bypass input in order to prevent the physical injury.

6.4 EPO

EPO switch is designed to switch off the UPS in emergency conditions (such as fire, flood). The system will turn off the rectifier,
inverter and stop powering the load immediately (inverter and bypass output included), and the battery stops charging or
discharging.

If the mains input is present, the UPS control circuit will remain active; however, the output is opened. To remove all mains
power from the UPS, the external input switch should be disconnected.

6.5 Auto Restart

When the mains power failure, the UPS draws power from the battery to supply the load until the batteries end of discharge is
reached, then the UPS will shut down.

The UPS will automatically restart and recover output power supply:

 After the mains power is restored.
 The UPS Auto Restart function is enabled.
 After the Auto Restart is delayed (default: 10 minutes). During the Auto Restart delay, the UPS will charge the battery to

provide a safety margin for equipment shutdown if input power fails again.

If the Auto Restart function is disabled, you can restart the UPS manually by pressing the FAULT CLEAR button.

54 User Manual 10H52188UM60 - Rev. 2 - 09/2012

UPS Operation Instructions Liebert NXC

6.6 UPS Reset

The EPO action or the following reasons such as inverter overtemperature, power-off overload, battery overvoltage and
excessive switching may result in the UPS power-off. After all appropriate measures have been taken to clear the faults
indicated by the alarm message appearing on the LCD, you can carry out the following steps to restore the UPS to normal
operation state.

1. Press the FAULT CLEAR button to make the system exit the EPO state.

2. Press the ON button for 2s.

Note

1. The rectifier restarts, and the bypass supplies power to the load. When the rectifier starts, the fault indicator blinks. When the rectifier
runs in normal operation state (about 30 seconds later), the fault indicator will turn off.

2. 5 minutes after the overtemperature signal disappears, that is, when the overtemperature fault is eliminated, the rectifier will
automatically start.

3. After the EPO button is pressed, if the mains input is disconnected, the UPS will shut down completely. When the mains input is available,
the UPS will start and run in Bypass mode, and also the output is available.

6.7 Language Selection

The LCD menus are available in 17 languages: English, German, Italian, French, Spanish, Portuguese, Chinese, Japanese,
Swedish, Russian, Polish, Czech, Turkish, Arabic, Dutch, Finnish and Norwegian.

Procedures for selecting the language:

1. From the ‘Output’ menu, press F3 or F4 (left or right arrow) to select the ‘Language’ menu.

2. Press F5 (Enter) to move the cursor to the data window of the LCD.

3. Use F3 and F4 (up and down arrow) to select the required language.

4. Press F5 (Enter) to confirm.

5. Return to the ‘Output’ menu by repeatedly pressing F2 (ESC). At this point, all texts on the LCD will be displayed in the
selected language.

6.8 Changing Current Date And Time

Procedures for changing the system date and time:

1. From the ‘Output’ menu, press F3 or F4 (left or right arrow) to select the ‘Settings’ menu.

2. Press F5 (Enter) to move the cursor to the data window of the LCD.

3. Use F3 and F4 (up and down arrows) to select ‘Date & time’ option, then press F5 (Enter).

4. Move the cursor to the row in which the date and time are displayed, then press F5 (Enter).

5. Use F3 or F4 (up or down arrows), and enter the current time and date information.

6. Press F5 (Enter) to confirm, and then press F2 (ESC) to return to the ‘Output’ menu.

6.9 Control Password

The system provides the password protection for the UPS operation control. The default password of the background software
is ‘12345’. Only through the password verification can you conduct the UPS and battery test operation.

User Manual 10H52188UM60 - Rev. 2 - 09/2012 55

Liebert NXC Communication

Chapter 7 Communication

This chapter briefly introduces the UPS communication.

The communication ports include: Intellislot cards port, opto-coupled port, dry contact port and USB port.

7.1 Installing Intellislot cards

7.1.1 Intellislot card Port

UPS provides an Intellislot card port (see Figure 7-1), which is used to install the communication device options, including
global connectivity cards and LIFE.net adapter. The Intellislot card port and USB port can be used at the same time.

Figure 7-1 Intellislot card installation

Refer to UPS Extended Dry Contact Card User Manual for the installation and operation guide.

7.2 Connection cables for dry contact port and opto-coupled port

The UPS provides two dry contact ports and three opto-coupled ports; see Figure 1-3 for the specific positions. The silk prints
of the five ports are 1, 2, 3, 4 and 5. The pin layout of each port is shown in Figure 7-2, and the port description is shown in
Figure 7-1. Cable cross-sectional are 0,1-1,5mm

2

.

+12V +12V +12V

SALARM

GND

On_battery

GND

On_bapass

GND

Epo_NC

+12V

+12V

Epo_IN

BFP_o

BFP_s

BFP_c

Figure 7-2 Pin layout of dry contact and opto-coupled ports

Port n. Description

Signal

type

Who supply the

power of signal

Rated

voltage

Rated

current

1 Output port of alarm output NXC port 1 12V DC 10mA

2

Output port of battery

status

output NXC port 2 12V DC 10mA

3

Output port of bypass

status

output NXC port 3 12V DC 10mA

Port n. Description

Signal

type

Who supply the

power of signal

Rated

voltage

Maximal resistance

of EPO_NO

Maximal resistance

of EPO_NC

4 Input port of remote EPO input NXC port 4 12V DC 10Ohm 10Ohm

Port n. Description

Signal

type

Who supply the

power of signal

Rated voltage and

current for NO contact

Rated voltage and

current for NC contact

5

Output port of bypass

backfeed

output External 5A 250V AC/24V DC

Intelligent card port

Opto-coupled port 1 Opto-coupled port 2 Opto-coupled port 3 Dr y contact port 4 Dry contact port 5

56 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Communication Liebert NXC

Description of the dry contact ports

Silk print Port name Pin NO. Pin name Meaning

1 Output port of alarm

1.1 S_ALARM The signal level is 12V when the system alarms

1.2 GND GND

2 Output port of battery status

2.1 ON_BATTERY The signal level is 12V when the system runs in battery mode

2.2 GND GND

3 Output port of bypass status

3.1 ON_BYPASS The level is 12V when the system runs in bypass mode

3.2 GND GND

4 Input port of remote EPO*

4.1 EPO_NC EPO activated when opened to 4.2

4.2

＋

12V

EPO activated when opened to 4.1

4.3

＋

12V

EPO activated when shorted to 4.4

4.4 EPO_IN EPO activated when shorted to 4.3

5

Output port of bypass
backfeed

5.1 BFP_O

Bypass backfeed protection relay (normally open). Closes when
short circuit of bypass silicon controlled rectifier (SCR) leads to
backfeed

5.2 BFP_S The middle point of the bypass backfeed protection relay

5.3 BFP_C

Bypass backfeed protection relay (normally open). Opens
when short circuit of bypass SCR leads to backfeed

Note*:
Pin1 and pin2, or pin3 and pin4 of the dry contact port 4 reserves the corresponding terminals for configuring the REPO function. The
REPO device also needs the shielded cable to connect to the normally open/closed remote REPO switch between the two terminals. If not
necessary, you should disconnect pin3 and pin4 of the dry contact port 4, or short pin1 and pin2 of the dry contact port 4. Pin1 and pin2 of
the dry contact port 4 have been shorted before delivery

Note

The EPO action of the UPS will stop the rectifier, inverter and static bypass, but it cannot disconnect the UPS mains input inside. If you want
to disconnect the UPS completely, just disconnect the upstream input MCB when generating the EPO.

In emergency conditions, close the REPO switch (prepared by users) to shut down the rectifier and inverter, and the UPS is
powered off. In normal condition, the REPO switch cannot cut off the UPS input power. If a switch of electronic control tripping
function is adopted at the UPS input, the REPO switch can help the switch trip and thus cut off the UPS input power. The
position of the REPO switch is shown in Figure 1-3, and the REPO cable connection is shown in Figure 7-3.

Figure 7-3 REPO cable connection

The cable connection procedures are as follows:

1. Loosen the “+12V” and “EPO_IN” connection terminals of the REPO port.

2. Insert the two ends of the copper core cables with the insulation stripped back into the “+12V” and “EPO_IN” connection
terminals of the REPO port, and press down the terminals. The REPO cable is complete. Ensure that the REPO cable is firmly
connected to avoid no action or wrong action of the REPO caused by accidental dropping or rough handling.

3. For parallel UPS, when connecting the REPO cable, users should parallel connect “+12V” of the REPO port with one end of
the electronic switch, and parallel connect “EPO_IN” with the other end of the electronic switch. Note the difference between
the port silkscreen “+” and “-” during connection.

When the REPO switch at the user end closes, the UPS will generate an alarm and cut off the output immediately, and the UPS
will not return to the normal operation state automatically. At this point, you must change the REPO switch state, and power
on the UPS manually.

REPO switch

REPO plug

User Manual 10H52188UM60 - Rev. 2 - 09/2012 57

Liebert NXC Communication

Note

1. It is recommended to use 0.82mm2 ~ 0.33mm2 (signal cable of 18AWG ~ 33AWG) copper core cable.

2. If the switch you have configured is of electronic control tripping function, when the REPO signal takes action, you need to close the
switch before restart the UPS.

7.3 Connecting USB Communication Cables

The USB port is located on the rear panel of the UPS, as shown in Figure 1-3.

The USB port can connect the monitoring software.

The methods to connect the communication cable are as follows:

Insert one end of the USB communication cable to the USB port (see Figure 1-3) on the rear panel of the UPS, and connect the
other end to the USB port of the computer.

After the connection, you need to install the USB drive program in the installation disk.

58 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Maintenance Liebert NXC

Chapter 8 Maintenance

This chapter focuses on the UPS maintenance, including the fan maintenance, battery maintenance, UPS cleaning, UPS state
check, UPS function check.

8.1 Fan Maintenance

The UPS fans are expected to run for 20000 hours ~ 40000 hours continuously. The higher the ambient temperature, the
shorter the fan life is.

During the UPS operation, please verify the fan status once every half year by confirming that air blows out from the
ventilation holes on the rear panel.

8.2 Battery Maintenance

Note

1. Never reverse-connect the battery, otherwise the fire will occur.

2. Never open the battery to prevent physical injury because of the electrolyte. If you accidentally touch the electrolyte, wash the area
immediately with plenty of clean water and go to hospital.

The internal battery module of the UPS is sealed, lead-acid, maintenance-free battery. The battery life depends on the ambient
temperature, charge and discharge times. High ambient temperature and deep discharge shortens the battery life.

To ensure the battery life, it is required to:

 Keep the ambient temperature ranging from 15°C to 25°C.
 Prevent small current discharge. Continuous battery operation time exceeding 24 hours is strictly prohibited.
 Charge the battery for at least 12 hours, if the battery hasn't been charged for three months at specified ambient

temperature, or two months at high ambient temperature.

Note

1. Make sure that the safety equipment are complete and that the function is normal, especially that the settings of the battery

management parameters are normal.

2. Measure and record the internal temperature of the battery room.

3. Check whether the battery terminals are damaged or hot, and whether the cases and the covers are damaged.

If liquid leakage and damage to the battery are found, place the battery in the anti-vitriol tank, and deal with it according to
the local regulations.

The waste lead-acid battery is dangerous waste material. It is one of the national emphases to control the waste battery
pollution. Its storage, transportation, usage and disposal must follow the national and local law and other criterions about the
dangerous waste material and the waste battery pollution prevention.

According to the related regulations, recycle the waste lead-aid battery, and other disposal methods are prohibited. Throwing
away randomly the waste lead-aid battery and other improper disposal methods can result in serious environment pollution,
which will be investigated the legal responsibility.

As the provider of the lead-acid battery, Emerson has built perfect service network and recycle system for the waste battery to
assist users to deal with the waste battery by law. Contact Emerson or the nearest service center for the detailed information
of the recycle system about the waste battery.

Emerson is not liable for the environment results caused by failure to comply with the notices in this section or to use the
waste battery recycle system provided by Emerson.

User Manual 10H52188UM60 - Rev. 2 - 09/2012 59

Liebert NXC Maintenance

8.3 Cleaning UPS

Clean the UPS periodically, especially the ventilation holes, to ensure free airflow inside the UPS. If necessary, clean the UPS
with a vacuum cleaner. Confirm that the ventilation holes are unobstructed.

8.4 Checking UPS State

It is recommended to check the UPS operation status once every half year.

Check the following items:

1. Check if the UPS is faulty: Is the FAULT indicator on? Is the UPS giving any alarm?

2. Check if the UPS is operating in Bypass mode. Normally, the UPS operates in Normal mode; if it is operating in Bypass mode,
you should find out the reason, such as operator intervention, overload, internal fault, and so on.

3. Check if the battery is discharging: When AC mains is normal, the battery should not discharge; if the UPS operates in
Battery mode, you should find out the reason, such as mains failure, battery test, operator intervention, and so on.

8.5 Checking UPS Functions

Note

UPS functional check procedures may cause power interruption to load!

It is recommended to check the UPS functions once every half year.

Backup the load data before conducting the UPS functional check. Procedures are as follows:

1. Press the OFF button to check if the buzzer beeps, indicators are on and the LCD display is normal.

2. Press the ALARM CLEAR button to check again if the indicators are on, the LCD display is normal and the UPS has been
transferred to the inverter mode.

60 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Product Specifications Liebert NXC

Chapter 9 Product Specifications

The chapter lists the UPS specifications.

9.1 Conformity and Standards

The UPS has been designed to conform to the European and international standards listed in Table 9-1.

Table 9-1 European and International Standards

Item Normative reference

General and safety requirements for UPS EN/IEC 62040-1

EMC requirements for UPS EN/IEC 62040-2 (category C2)

Note: The product standards in this table incorporate relevant compliance clauses with generic IEC and EN standards for safety
(IEC/EN/60950), electromagnetic emission and immunity (IEC/EN/61000 series) and construction (IEC/EN/60146 series and 60529)

9.2 Environmental Characteristics

Table 9-2 Environmental Characteristics

Item Unit

Rated power (kVA)

10 15 20

Noise within 1 m (from the front) dBA <58 <58 <58

Altitude m >2000, derating according to GB/T3859.2 when higher that 2000 m

Relative humidity %RH 5 -95, non condensing

Operating temperature °C 0 to 40; battery life is halved for every 10°C increase above 20°C

Storage and transport temperature for
UPS

°C -20 to 70

Recommended battery storage
temperature

°C -20 to 30 (20°C for optimum battery storage)

Overvoltage level II

Pollution level II

9.3 Mechanical Characteristics

Table 9-3 Mechanical Characteristics

Item Unit

Rated power (kVA)

10 15 20

Dimensions (W × D × H) mm 500 x 860 x 1240

Net / Gross Weight
(excluding battery)

kg 115/145

Net / Gross Weight
(one string of battery)

kg 215/245

Net / Gross Weight
(two strings of battery)

kg 315/345

Net / Gross Weight
(three strings of battery)

kg 415/445

Net / Gross Weight
(four strings of battery)

kg 520/550

Color - Black ZP-7021

Protection degree, IEC (60529) - IP20

User Manual 10H52188UM60 - Rev. 2 - 09/2012 61

Liebert NXC Product Specifications

9.4 Electrical Characteristics (Input Rectifier)

Table 9-4 Rectifier AC Input (Mains)

Item Unit

Rated power (kVA)

10 15 20

Rated AC input voltage1 Vac 380/400/415; default 400

Freq uency2 Hz 40...70

Power factor

kW/kVA,
full load;
half load

>0.99 @ full load; > 0.98 @ half load

Input power

kVA rated

3

10 15 20

kVA rated3

(max.

4

)

15 20 25

Input current

A rated

3

14 21 28

A rated3

(max.

4

)

21 28 35

Harmonic current distortion THDI% FL <5 (3/3); <15 (3/1)

Duration of progressive power walk-in s 5

Note:

1

Rectifier operates at any of the rated supply voltages and frequencies without further adjustment.

2

At 305 V mains input, the UPS maintains the specified output voltage at rated load without discharging a previously charged battery.

3

EN/IEC 62040-3/EN50091-3: at rated load and input voltage 400V, battery charged.

4

EN/IEC 62040-3/EN50091-3: at rated load and input voltage 400V, battery charging at maximum rated power

9.5 Electrical Characteristics (Intermediate DC Circuit)

Table 9-5 Battery

Item Unit

Rated power (kVA)

10 15 20

Battery bus voltage Vdc Nominal: 384 (VRLA float charge is 436 V); range: 300 to 576

Quantity of lead-acid blocks

Nominal 32

Other

possible

values

30-34-36-38-40

Float voltage

V/cell

(VRLA)

2.27 (selectable between 2.2 V/cell and 2.3 V/cell)

Constant current and constant voltage charge mode

Ripple voltage % V float 1.41

Ripple current % C10 5

Boost voltage

V/cell

(VRLA)

2.35 (selectable between 2.3 V/cell and 2.4 V/cell)

Constant current and constant voltage charge mode

Programmable automatic trigger or inhibit of boost mode

Boost control -

Float-boost current trigger 0.050 C10 (selectable between 0.001 and 0.070)
Boost-float current trigger 0.010 C10 (selectable between 0.001 and 0.025)

24h safety time timeout (selectable between 8h and 30h)

Boost mode inhibit also selectable

EOD voltage

V/cell

(VRLA)

Lower limit: 1.63 (selectable between 1.60 V/cell and 1.67 V/cell)
Upper limit: 1.75 (selectable between 1.67 V/cell and 1.85 V/cell)

Automatic inverse, EOD voltage x discharge current mode

(the EOD voltage increases at low discharge currents)

Max battery charging power1 and max
charging current (adjustable)

2

kW 4.5

A 11

Note:

1

At low input voltage the UPS recharge capability increases as the load decreases (up to the maximum capacity indicated).

2

Max currents listed are for EOD voltage of 1.67 V/cell for 240 cells

62 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Product Specifications Liebert NXC

9.6 Electrical Characteristics (Inverter Output)

Table 9-6Inverter Output (to Critical Load)

Item Unit

Rated power (kVA)

10 15 20

Rated AC voltage1 Vac 3-In 3-Out: 230Vac ±1% 3 phase balanced

Frequency2 Hz 50/60

Overload

60 min % 105

5 min % 125

1 min % 150

< 200 ms % >150

Fault current A (RMS) 91A for 200ms

Non-linear load capability3 % 100

Load crest factor - 3:1

Max. neutral current for non-linear load A (RMS) 50

Steady state voltage stability % ±1

Transient voltage response for 100%
rated linear load step

- ±5% within 60ms

Total harmonic voltage (0-100% load) % 2% linear load; 5% non linear load

Synchronization window % Rated frequency ±8

Slew rate (max change rate of
synchronization frequency)

Hz/s 0.6 (single UPS), 0.2 (parallel system)

Note:

1

Factory set to 400V, 380V or 415V selectable by commissioning engineer.

2

Factory set to 50Hz, 60Hz selectable by commissioning engineer. Note that the system frequency can be changed only when the UPS is

on bypass. It is strictly prohibited to change the system frequency when the UPS is on inverter.

3

IEC 62040-3, annex E (crest factor 3:1).

9.7 Electrical Characteristics (Bypass Input)

Table 9-7 Bypass Input

Item Unit

Rated power (kVA)

10 15 20

Rated AC voltage

1

Vac

380/400/415, three-phase five-wire, sharing neutral with the rectifier input and
providing neutral reference to the output

Rated current

380V
400V
415V

A 16 23 30

A 15 22 29

A 14 21 28

Current rating of neutral cable A 87

Overload

long time % 105

5 min % 125

1 min % 150

1 s % 400

< 200ms % >400

Frequency2 Hz 50/60

Transfer time (between bypass and
inverter)

ms

Synchronous <2 ms

Asynchronous <20 ms (40, 60, 80, 100, 120 can be set)

Bypass voltage tolerance %Vac

Upper limit: +10, +15 or +20; default: +15

Lower limit: -10, -20, -30 or -40; default: -20

Bypass frequency tolerance % ±10

Synchronization window % Rated frequency ±8

Note:

1

Factory set to 400V, 380V or 415 V selectable by commissioning engineer.

2

Factory set to 50Hz, 60 Hz selectable by commissioning engineer.

User Manual 10H52188UM60 - Rev. 2 - 09/2012 63

Liebert NXC Product Specifications

9.8 Efficiency, Heat Losses and Air Exchange

Table 9-8 Efficiency, Heat Losses and Air Exchange

Item Unit

Rated power (kVA)

10 15 20

Overall efficiency

Normal mode
(double-conversion)

100% load % 94.2 94.1 94.0

66% load % 93.9 94.2 94.5

33% load % 91.3 93.7 93.9

ECO Mode % 98

Battery mode % 92.5 92.8 93

Heat losses & air exchange

Normal mode kW 0.55 0.84 1.15

Eco mode kW 0.18 0.28 0.37

No load kW 0.24

Maximum forced air cooling
(front intake, rear exhaust)

L/sec 208

Note: 400Vac input and output, battery fully charged, full-rated linear load

64 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Options Liebert NXC

Chapter 10 Options

This chapter introduces the options of the UPS.

10.1 Option list

See Table 10-1 for the option list.

Table 10-1 Option list

Option name Model Remark

Communication cables 00B46158P77

Liebert® NXC 10/15/20kVA UPS parallel communication cable, LBS
Communication cable

10.2 Communication Cables

Communication cable is compulsory in parallel system. See Table 10-2 for cable description. Refer to 4.3.2 for the methods to
connect the parallel cables.

Table 10-2 Description of the communication cable

Type Name Description Appearance

00B46158P77

Communiation

cable

For N + 1 parallel system, N + 1 communication cables are
needed. For example, two communication cables are needed
in 1 + 1 parallel system; three communication cables are
needed in 2 + 1 parallel system; four communication cables
are needed in 3 + 1 parallel system

10.3 Battery Cabinet

For extra long back up time an external battery cabinet is available.

Figure 10-1 Appearance of the battery cabinet

User Manual 10H52188UM60 - Rev. 2 - 09/2012 65

Liebert NXC Options

10.4 Liebert NXC Input Transformer Version

This UPS includes an isolation transformer at the UPS input. This transformer is installed in place of the batteries and provides
electrical isolation between the load and the input mains utility.

Figure 10-2 UPS with input isolating transformer

10.5 Liebert NXC Output Transformer Version

This UPS includes an isolation transformer at the UPS output. This transformer is installed in place of the batteries and provides
electrical isolation between the UPS output and the load.

Figure 10-3 UPS with output isolating transformer

WARNING: remove the connection between neutral and earth on the transformer secondary terminal for IT use.

Th

e custome

r must install the isolation control devic

e.

66 User Manual 10H52188UM60 - Rev. 2 - 09/2012

Appendix 1 Abbreviations Liebert NXC

Appendix 1 Abbreviations

AC Alternating current

CSA Cross sectional area

DC Direct current

DSP Digital signal processor

EMC Electromagnetic compatibility

EOD End-of-discharge

EPO Emergency power off

LCD Liquid crystal display

LBS Load bus synchronizer

MCB Miniature circuit breaker

PE Protective earth

RCCB Residual current circuit breaker

RCD Residual current detector

RFI Radio frequency interference

SCR Silicon-controlled rectifier

STS Static transfer switch

UPS Uninterruptible power system

VRLA Valve-regulated lead-acid

User Manual 10H52188UM60 - Rev. 2 - 09/2012 67

Liebert NXC Appendix 2 Information for the protection of the Environment

Appendix 2 Information for the protection of the Environment

This unit makes use of components dangerous for the environment (electronic cards, electronic components and batteries).
The components removed must be taken to specialized collection and disposal centers.

In case of complete unit dismantling, this operation shall be carried out by specialized personnel and the unit must be taken to
centers specialized in collection and disposal of dangerous substances.

Part name

Hazardous Substances or Elements Announcement

Lead Mercury Cadmium Chrome PBB PBDE

Pb

Hg Cd Cr6+ PBB PBDE

Hex copper stud

× o

o o o o

PCBA

×

o o o o o

AC capacitor

×

o o o o o

DC capacitor

×

o o o o o

Fan

×

o o o o o

Cables

×

o o o o o

LCD

× ×

o o o o

Sensors

×

o o o o o

Large-medium power
magnetic components

×

o o o o o

circuit breaker / rotating
switch

×

o o o o o

Semiconductors

×

o o o o o

Battery (when applicable)

×

o o o o o

Insulation monitoring
device (when applicable)

×

o o o o

×

o

: Means the content of the hazardous substances in all the average quality materials of the part is within the limits specified
in SJ/T-11363-2006
×: Means the content of the hazardous substances in at least one of the average quality materials of the part is outside the
limits specified in SJ/T11363-2006
Emerson Network Power Co., Ltd. has been committed to the design and manufacturing of environment-friendly products.
It will reduce and eventually eliminate the harzardous substances in the products through unremitting efforts in
research.However, limited by the current technical level, the following parts still contain hazardous substances due to the
lack of reliable substitute or mature solution:

1. All solders in the products contain lead

2. Copper alloy contains lead

3. Backlight bulb contains Mercury

4. The ceramic materials of the ceramic capacitor, the copper terminals and copper leads of metallic film capacity contain
lead.

5. The glass of resistor contains lead.

6. The glass of LCD contains lead, and the backlight lamp contains Mercury.

7. The lead in the battery is determined by the battery feature and technical levels.

8. The insulation monitoring device contains lead and PBDE.

NOTICE TO EUROPEAN UNION CUSTOMERS: DISPOSAL OF OLD APPLIANCES

This product has been supplied from an environmentally aware manufacturer that complies
with the Waste Electrical and Electronic Equipment (WEEE) Directive 2002/96/CE.

The “crossed-out wheelie bin” symbol at right is placed on this product to encourage you to
recycle wherever possible. Please be environmentally responsible and recycle this product
through your recycling facility at its end of life. Do not dispose of this product as unsorted
municipal waste. Follow local municipal waste ordinances for proper disposal provisions to
reduce the environmental impact of waste electrical and electronic equipment (WEEE).

For information regarding the scrapping of this equipment please contact your closest
Emerson Representative.

Ensuring The High Availability
Of Mission-Critical Data And Applications.

Emerson Network Power

The global leader in enabling Business-Critical Continuity

™. EmersonNetworkPower.com

AC Power

Connectivity

DC Power

Embedded Computing
Embedded Power
Infrastructure Management & Monitoring

Outside Plant
Power Switching & Controls

Precision Cooling

Racks & Integrated Cabinets
Services
Surge Protection

Locations

Emerson Network Power

Via Leonardo Da Vinci 16/18

Zona Industriale Tognana

35028 Piove di Sacco (PD) Italy

Tel: [phone]

Fax: [phone]

[e-mail]

Via Fornace, 30

40023 Castel Guelfo (BO) Italy

Tel: [phone]

Fax: [phone]

[e-mail]

United States

1050 Dearborn Drive

P.O. Box 29186

Columbus, OH 43229

Tel: [phone]

Asia

7/F, Dah Sing Financial Centre

108 Gloucester Road, Wanchai

Hong Kong

Tel: [phone]

Fax: [phone]

Emerson, Business-Critical Continuity and Emerson Network Power are trademarks of Emerson Electric Co. or one of its afliated companies. ©2011 Emerson Electric Co.