Vertiv Liebert EXS 80kVA UPS User manual

Liebert EXS 80kVA UPS
User Manual

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Vertiv™ | Liebert EXS 80kVA UPS User Manual
Vertiv™ Aisle Containment System (VACS) User Manual

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Vertiv™ | Liebert EXS 80kVA UPS User Manual
Table of Contents
Special Declaration..........................................................................................................................................................................1
Safety Precaution ...........................................................................................................................................................................2
1 Overview .........................................................................................................................................................................................5
1.1 Features .....................................................................................................................................................................................................................................................................................................5
1.2 Design Concept ............................................................................................................................................................................................................................................................................... 6
1.2.1 System Design ................................................................................................................................................................................................................................................................... 6
1.2.2 Bypass ......................................................................................................................................................................................................................................................................................7
1.2.3 System Control Principle ........................................................................................................................................................................................................................................7
1.2.4 UPS Power Supply Switch Conguration ............................................................................................................................................................................................. 8
1.2.5 Battery Circuit Breaker (BCB)............................................................................................................................................................................................................................ 9
1.3 Parallel System.................................................................................................................................................................................................................................................................................. 9
1.3.1 Parallel System Features.......................................................................................................................................................................................................................................... 9
1.3.2 Parallel System Requirements.........................................................................................................................................................................................................................10
1.4 UPS States and Operating Modes...............................................................................................................................................................................................................................10
1.5 Battery Management................................................................................................................................................................................................................................................................ 13
1.5.1 Normal Function.............................................................................................................................................................................................................................................................13
1.5.2 Advanced Function....................................................................................................................................................................................................................................................14
1.5.3 Battery Temperature Compensation ....................................................................................................................................................................................................... 15
1.6 Battery Protection........................................................................................................................................................................................................................................................................15
2 Mechanical Installation............................................................................................................................................................ 17
2.1 Precautions......................................................................................................................................................................................................................................................................................... 17
2.2 Transportation................................................................................................................................................................................................................................................................................18
2.3 Tools.........................................................................................................................................................................................................................................................................................................18
2.4 Unpacking .........................................................................................................................................................................................................................................................................................20
2.5 Initial Inspection ......................................................................................................................................................................................................................................................................... 22
2.6 Environmental Requirements ........................................................................................................................................................................................................................................ 22
2.6.1.UPS Room ........................................................................................................................................................................................................................................................................... 22
2.6.2.Reserved Space............................................................................................................................................................................................................................................................ 23
2.6.3.Battery Room.................................................................................................................................................................................................................................................................. 23
2.6.4.Storage Environment.............................................................................................................................................................................................................................................. 24

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Vertiv™ | Liebert EXS 80kVA UPS User Manual
2.7 Mechanical Requirements .................................................................................................................................................................................................................................................24
2.7.1.Moving Cabinet .............................................................................................................................................................................................................................................................. 24
2.7.2.Clearance............................................................................................................................................................................................................................................................................. 24
2.7.3.Cable Access Mode................................................................................................................................................................................................................................................... 24
2.8 Installation Drawings............................................................................................................................................................................................................................................................... 25
3 Electrical Installation.....................................................................................................................................................................................27
3.1 Wiring of Power Cable..............................................................................................................................................................................................................................................................27
3.1.1 System Conguration ...............................................................................................................................................................................................................................................27
3.1.2 Maximum Steady State AC and DC Currents..................................................................................................................................................................................28
3.1.3 Recommended CSA of UPS Cable............................................................................................................................................................................................................. 28
3.1.4 Selection of UPS I/O Switch..............................................................................................................................................................................................................................28
3.1.5 Power Cable Connecting Terminal.............................................................................................................................................................................................................29
3.1.6 Protection Ground .....................................................................................................................................................................................................................................................29
3.1.7 Notes........................................................................................................................................................................................................................................................................................29
3.1.8 Power Cable Connection Steps.....................................................................................................................................................................................................................29
3.2 Wiring of Signal Cable............................................................................................................................................................................................................................................................ 32
4 Operator Control And Display Panel ...................................................................................................................................33
4.1 Introduction....................................................................................................................................................................................................................................................................................... 33
4.1.1.LED Indicators.................................................................................................................................................................................................................................................................. 33
4.1.2.Audible Alarm (Buzzer).........................................................................................................................................................................................................................................34
4.1.3.LCD and Functional Keys.....................................................................................................................................................................................................................................34
4.1.4.LCD Menu Structure................................................................................................................................................................................................................................................ 35
4.2 LCD Screen Types................................................................................................................................................................................................................................................................... 35
4.2.1.Start-up Screen .............................................................................................................................................................................................................................................................35
4.2.2.Flow Screen......................................................................................................................................................................................................................................................................36
4.2.3.Main Menu Screen ....................................................................................................................................................................................................................................................36
4.2.4.Submenu Screen .........................................................................................................................................................................................................................................................37
4.2.5.Default Screen................................................................................................................................................................................................................................................................41
4.3 Prompt Window.............................................................................................................................................................................................................................................................................41
4.4 UPS Alarm Message List....................................................................................................................................................................................................................................................44

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Vertiv™ | Liebert EXS 80kVA UPS User Manual
5 UPS Operating Instructions ................................................................................................................................................. 49
5.1 Brief Introduction.........................................................................................................................................................................................................................................................................49
5.1.1.Precautions..........................................................................................................................................................................................................................................................................49
5.1.2.Power Switch....................................................................................................................................................................................................................................................................49
5.1.3.Check before Start-up.............................................................................................................................................................................................................................................50
5.2 UPS Start-up Procedures ...................................................................................................................................................................................................................................................50
5.2.1.Start-up Procedures in Normal Mode.......................................................................................................................................................................................................51
5.2.2.Start-up Procedures in Battery Mode (Battery Cold Start)..............................................................................................................................................53
5.3 Procedures for Transferring between Operating Modes..................................................................................................................................................................... 53
5.3.1.Transfer from Normal Mode to Battery Mode..................................................................................................................................................................................53
5.3.2.Transfer from Normal Mode to Bypass Mode.................................................................................................................................................................................53
5.3.3.Transfer from Bypass Mode to Normal Mode .................................................................................................................................................................................54
5.3.4.Transfer from Normal Mode to Maintenance Bypass Mode............................................................................................................................................. 55
5.3.5.Transfer from Maintenance Bypass Mode to Normal Mode.............................................................................................................................................56
5.4 Battery Test Procedures......................................................................................................................................................................................................................................................56
5.5 System Test Procedure.........................................................................................................................................................................................................................................................57
5.6 UPS Shutdown Procedures ..............................................................................................................................................................................................................................................58
5.6.1.Procedures for Completely Powering down UPS .........................................................................................................................................................................58
5.6.2.Procedures for Completely Powering down UPS while Maintaining Power to Load................................................................................58
5.7 EPO...........................................................................................................................................................................................................................................................................................................58
5.8 UPS Reset Procedures after EPO...............................................................................................................................................................................................................................59
5.9 Automatic Restart......................................................................................................................................................................................................................................................................59
5.10 Selecting Language...............................................................................................................................................................................................................................................................60
5.11 Changing Current Date and Time..............................................................................................................................................................................................................................61
5.12 Setting Password......................................................................................................................................................................................................................................................................63
6 Parallel System and LBS System.................................................................................................................................................................................................... 67
6.1 General................................................................................................................................................................................................................................................................................................... 67
6.2 Requirements................................................................................................................................................................................................................................................................................. 67
6.3 System Installation Procedures....................................................................................................................................................................................................................................67
6.3.1. Preliminary Checks...................................................................................................................................................................................................................................................68
6.3.2.Cabinet Installation...................................................................................................................................................................................................................................................68
6.3.3.Power Cables...................................................................................................................................................................................................................................................................69

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Vertiv™ | Liebert EXS 80kVA UPS User Manual
6.3.4. Parallel Cables..............................................................................................................................................................................................................................................................69
6.3.5.Remote EPO.....................................................................................................................................................................................................................................................................69
6.4 Operation Procedures for Parallel System.........................................................................................................................................................................................................70
6.4.1.Check before Start-up ............................................................................................................................................................................................................................................70
6.4.2.Parallel System Parameters Setting.......................................................................................................................................................................................................... 71
6.4.3.Power-on Procedures for Parallel System........................................................................................................................................................................................... 71
6.4.4.Maintenance Bypass Procedures................................................................................................................................................................................................................72
6.4.5.Procedures for Isolating One UPS Module from Parallel System.................................................................................................................................73
6.4.6.Procedures for Inserting One Isolated UPS Module in Parallel System.................................................................................................................73
6.4.7.6.4.7 Procedures for Completely Powering down UPS........................................................................................................................................................ 74
6.4.8.Procedures for Complete UPS Shutdown while Maintaining Power to Load.................................................................................................. 74
6.5 LBS System...................................................................................................................................................................................................................................................................................... 74
6.5.1.Overview ............................................................................................................................................................................................................................................................................... 74
6.5.2.Cabinet Installation................................................................................................................................................................................................................................................... 74
6.5.3.Connecting Power Cables.................................................................................................................................................................................................................................. 76
6.5.4.Connecting LBS Cables ....................................................................................................................................................................................................................................... 76
6.5.5.LBS Parameters Setting....................................................................................................................................................................................................................................... 76
6.5.6.LBS System Commissioning............................................................................................................................................................................................................................ 76
7 Communication..................................................................................................................................................................................................................................................77
7.1 Installing Intelligent Card.......................................................................................................................................................................................................................................................77
7.1.1.Intelligent Card Port .....................................................................................................................................................................................................................................................77
7.1.2.Intelligent Card Option............................................................................................................................................................................................................................................ 78
7.1.3. Installation Procedures...........................................................................................................................................................................................................................................81
7.2 Connection Cables for Dry Contact Port.............................................................................................................................................................................................................82
7.3 Connecting Parallel Cables ...............................................................................................................................................................................................................................................85
7.4 Connecting LBS Cables........................................................................................................................................................................................................................................................85
8 Maintenance................................................................................................................................................................................87
8.1 Fan Maintenance.......................................................................................................................................................................................................................................................................... 87
8.2 Battery Maintenance............................................................................................................................................................................................................................................................... 87
8.3 Cleaning UPS..................................................................................................................................................................................................................................................................................88
8.4 Checking UPS State................................................................................................................................................................................................................................................................88
8.5 Checking UPS Functions ..................................................................................................................................................................................................................................................88

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Vertiv™ | Liebert EXS 80kVA UPS User Manual
9 Options........................................................................................................................................................................................ 89
9.1 List of Options.................................................................................................................................................................................................................................................................................89
9.2 Parallel Cables ...............................................................................................................................................................................................................................................................................90
9.3 LBS Cables........................................................................................................................................................................................................................................................................................90
9.4 Communication Options and Temperature Sensor...................................................................................................................................................................................91
9.5 BCB Box...............................................................................................................................................................................................................................................................................................92
9.5.1.Overview ...............................................................................................................................................................................................................................................................................92
9.5.2.Connection of BCB Box ........................................................................................................................................................................................................................................93
9.6 Battery Cabinet.............................................................................................................................................................................................................................................................................94
9.7 Output Transformer..................................................................................................................................................................................................................................................................96
9.8 Top Fan................................................................................................................................................................................................................................................................................................. 97
9.9 IP31 Kit...................................................................................................................................................................................................................................................................................................98
9.10 C2 Electromagnetic Shielding Assembly..........................................................................................................................................................................................................98
10 Specifications .......................................................................................................................................................................... 99
10.1 Conformance and Standards .......................................................................................................................................................................................................................................99
10.2 Environmental Characteristics ..................................................................................................................................................................................................................................99
10.3 Mechanical Characteristics.........................................................................................................................................................................................................................................100
10.4 Electrical Characteristics (Input Rectier)...................................................................................................................................................................................................100
10.5 Electrical Characteristics (Battery).....................................................................................................................................................................................................................100
10.6 Electrical Characteristics (Inverter Output)................................................................................................................................................................................................ 101
10.7 Electrical Characteristics (Bypass Input)...................................................................................................................................................................................................... 101
Appendix I LCD Parameters Setting............................................................................................................................................................................................103
Appendix II Glossary.................................................................................................................................................................................................................................... 109
Appendix III Hazardous Substances and Content.........................................................................................................................................................110

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Vertiv™ Liebert EXS 80kVA UPS User Manual
Special Declaration
Special Declaration
Personnel Safety
1. This product must be installed and commissioned by professional engineers of the manufacturer or its
authorized agent. Failure to observe this could result in product malfunction or personnel safety risk.
2. Take the time to read this product manual and the safety precaution thoroughly before installing and
commissioning this product. Failure to observe this could result in product malfunction or personnel
safety risk.
3. This product is not intended for life support equipment application.
4. Never dispose of the internal or external battery of this product in a re, as it may explode and
jeopardize personnel safety when exposed to ame.
Product Safety
1. If this product will be stored or remain de-energized for a long period, it must be placed in a dry and
clean environment within specied temperature range.
2. This product should be used in an appropriate operating environment. For details, refer to the section
on the environmental requirement in this manual.
3. This product is not designed for application in an environment:
• Where the temperature and relative humidity are outside the specications
• Subject to vibrations or shocks
• Where conductive dusts, corrosive gases, salts, or ammable gases are present
• Near heat sources or strong electromagnetic interferences
Disclaimer
Vertiv disclaims any and all responsibility or liability for the defects or malfunction caused by:
• Application range or operating environment outside the specications
• Unauthorized modication, improper installation or operation
• Force majeure
• Other actions not in compliance with the instructions in this manual

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Vertiv™ Liebert EXS 80kVA UPS User Manual
Safety Precaution
Safety Precaution
This manual contains information concerning the installation and operation of the Liebert EXS 80kVA UPS.
Read this manual thoroughly before installing, using and servicing the UPS.
To reduce the chance of accident, please read the safety precautions very carefully before operation. The
'Caution, Note, Warning' in this user manual and on the product do not represent all the safety points to
be observed, and are only supplement to various safety points. Therefore, the installation and operation
personnel must receive strict training and master the correct operations and all the safety points before
operation.
When operating Vertiv products, the operation personnel must observe the safety rules in the industry, the
general safety points and special safety instructions provided by Vertiv.
IMPORTANT! 1. The UPS must be installed, commissioned and serviced by engineers designated
by the manufacturer or its agent. Failure to observe this could result in personnel safety risk,
UPS malfunction and invalidation of warranty.
2. The UPS has been designed for commercial and industrial use only, and is not recommended
for use in life support applications.
WARNING! This is a product for commercial and industrial application in the second
environment installation restrictions or additional measures may be needed to prevent
disturbances.
The UPS with standard configuration is a category C3 product. Installation restrictions or
additional measures may be needed to prevent disturbances. The UPS adding C2 EMC option
based on the standard configuration is a category C2 product for a residential environment or
commercial and industrial application in the second environment.
Conformity and standards 1. The UPS complies with 2014/35/EU (LVD), 2014/30/EU (EMC),
2011/65/EU (Rohs) and the following product standards for UPS:
•IEC/EN 62040-1, General and safety requirements for UPS
•IEC/EN 62040-2: Class C2 compliant
•EC/EN 62040-3: Performance requirements and test methods
2. Continued compliance requires installation in accordance with these instructions and the use
of manufacturer approved accessories only.
WARNING! 1. Before moving or rewiring the UPS, disconnect mains input power and the battery
and make sure that the UPS is completely shut down. Otherwise, the output terminal may carry
live voltage, presenting an electric shock hazard.
2. Liquid or other irrelevant external objects are prohibited inside the UPS.
3. In case of a fire, a dry chemical fire extinguisher is essential. Using a foam fire extinguisher
will cause electric shock.
4. To prevent the radio frequency of output cables from disturbing other electric equipment, it is
recommended to use the UPS output cable with the length less than 10m.

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Vertiv™ Liebert EXS 80kVA UPS User Manual
Safety Precaution
WARNING! High earth leakage current
1. Earth connection is critical before connecting the input supply (including both mains supply
and battery).
2. Earth leakage current is less than 2500mA.
3. Transient and steady state earth leakage currents, which may occur when the equipment is
started, should be taken into account in the selection of instantaneous RCCBs or RCD devices.
RCCB which is sensitive to unidirectional DC pulse (class A) and insensitive to transient state
current pulse must be selected.
4. Note also that the earth leakage currents of the load will be carried by the RCCBs or RCDs.
5. The equipment must be earthed in accordance with the local electrical code of practice.
WARNING! Backfeeding protection
This UPS is fitted with a dry contact closure signal for use with an external automatic
disconnect device (supplied independently) to protect against backfeeding voltage into the
incoming terminal through the rectifier or bypass switch circuit. A label must be added at all
external incoming primary supply disconnect device to warn service personnel that the circuit
is connected to a UPS. The text of the label has the following meaning: Risk of voltage backfeed!
Isolate the UPS, then check for hazardous voltage between all terminals including the protective
earth before working on this circuit.
User serviceable components (For service personnel)
1. All equipment maintenance and servicing procedures involving internal access requires the
use of a tool and should be carried out only by trained personnel. There are no user-serviceable
parts behind covers requiring a tool/key for removal.
2. The UPS meets the safety requirements completely in operator access area. Only service
personnel can contact the hazardous voltage inside the UPS. However, the risk of contacting
these voltages is minimized because the components with hazardous voltage may be contacted
only by using a tool to remove the protective cover. No risk will exist if you follow the general
norms and in accordance with the procedures recommended in this manual on equipment
operation.
Battery voltage exceeds 400Vdc (For service personnel)
1. All physical battery maintenance and servicing procedures requires the use of a tool and
should be carried out only by trained personnel.
2. Operation on the battery will result in electric shock and high short-circuit current, therefore,
before operating the battery, the following should be observed:
•Remove the watches, rings and other metal objects.
•Use the tools with insulation handle.
•Wear rubber glove and shoes.
•Avoid to place the tools and metal objects on the battery surface.
•Cut o the charge power supply before connecting or disconnecting the battery terminals.
•Check whether the battery is earthed accidently, if yes, please disconnect the earthing.
Contacting any earth battery parts will result in electric shock. Therefore, make sure that the
battery is not earthed during installation and maintenance.
3. Battery manufacturers provide the details of the precautions to be observed when working
on, or in the vicinity of the batteries. These precautions should be followed implicitly at all times.
Attention should be paid to the recommendations concerning local environmental conditions
and the provision of protective clothing, first aid and fire-fighting facilities.
WARNING! 1. When selecting the UPS system upstream distribution protection equipment,
ensure that it complies with the local electric regulations.
2. When the internal fuse of the UPS is damaged, it must be replaced with fuse of the same
electric parameters from the designated manufacturer, and operated by qualified personnel.

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Vertiv™ Liebert EXS 80kVA UPS User Manual
Safety Precaution
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Vertiv™ Liebert EXS 80kVA UPS User Manual
1 Overview
1 Overview
The Liebert® EXS 80 kVA UPS (UPS for short) is a monolithic transformer-free UPS which delivers reliable
and high-quality AC power for mission critical application such as data centers, computers, communication
systems, healthcare, railway, and process & automation equipments.
This chapter introduces the features, design concept, operating principle, UPS state and operation mode
of the UPS.
1.1 Features
Features are as follows:
• Output power factor is up to 1
• Double conversion eiciency up to 96% and ECO mode eiciency up to 99
• Compact footprint with optional integrated isolation transformer
• Parallel up to 4units which delivers max capacity of 320 kVA
• Unity input power factor
• Tolerates wide range of input voltage i.e. 228 - 475 VAC without feeding battery backup power
• Flexible battery conguration: external battery (26 to 40-block)
• High capacity battery charger that delivers maximum charging current of 25 A
• Innovative air channel design improves relaibailit of the product
• Colorful LDC display panel to initutively inform you about UPS operating status and operating
parameters
• Features Eco mode and smart sleep mode functions, which helps to save the energy to the
maximum extent
• Tolerates conditional short circuit current rating (Icc) of 30 kA symmetrical rms

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Vertiv™ Liebert EXS 80kVA UPS User Manual
1 Overview
1.2 Design Concept
1.2.1 System Design
This section introduces the working principle of the UPS single module. The UPS adopts AC-DC-AC
converter (as shown in Figure 1-1). The rst stage conversion (AC-DC) adopts three-phase high frequency
rectier to convert the three-phase input voltage into stable DC bus voltage. The second stage conversion
(DC-AC) adopts three-phase high frequency inverter to convert the DC power supply into the three-phase
AC input voltage.
Figure 1-1 Block diagram for working principle of UPS single module
Input
Maintenance bypass switch
Bypass input switch
Rectifier input switch
Bypass input
Mains input
Battery charger
Output switch
Inverter switchInverterRectifier
Static switch
Maintenance bypass
UPS output
Battery
Output
Bypass automatic switch
1. The UPS is composed of mains input (main and bypass), rectier/PFC, charger, inverter, bypass, battery,
and output.
2. When the mains is normal, the rectier and inverter work together to supply the loads and charge the
battery.
3. When the mains is abnormal, the rectier/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 the AC power
to the load. If the battery voltage falls to end of discharge (EOD) voltage and the mains still has not
been recovered, the UPS will shut down (if the system uses split bypass conguration and the bypass
is normal, the system will transfer to bypass). The battery EOD voltage is preset. When the mains is
abnormal, the battery maintains the UPS operation till the battery voltage is reduced to EOD voltage
and the UPS shuts down, this time is called 'Backup Time'. The length of backup time depends on the
battery capacity and the loads.
4. After the mains returns to normal state, the UPS will automatically transfer from Battery mode to
Normal mode, and the rectier and inverter work together to supply the loads and charge the battery.

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Vertiv™ Liebert EXS 80kVA UPS User Manual
1 Overview
1.2.2 Bypass
Through the intelligent control of the 'Bypass Automatic Switch' (as shown in Figure 1-1), the loads can be
supplied by the inverter or the bypass. In normal situation, the loads are supplied by the inverter, in which
case the automatic inverter switch at inverter side is closed. In the case of overload (the overload delay
time expires) or inverter failure, the automatic inverter switch is opened, and the ' Bypass Automatic Switch
' module will automatically transfer the loads to the bypass.
In normal operating state, to realize the uninterrupted transfer between inverter and bypass, the inverter
output must be fully synchronized with the bypass.
Therefore, when the bypass frequency is within the synchronization range, the inverter control circuit will
synchronize the inverter output frequency with the bypass frequency and phase.
Besides, the UPS has a manual maintenance bypass switch for shutdown of the UPS upon maintenance. In
this situation, the bypass will directly supply the critical loads through the maintenance bypass.
NOTE: When the load is supplied by the bypass or maintenance bypass, the power supply quality will
be uncertain.
1.2.3 System Control Principle
Normal operation
Normal mode: It means that the UPS has normal input mains, the rectier and inverter operate normally,
the load is supplied by the inverter, the battery circuit breaker is closed, and the battery is in stable oating
charge state.
(Parallel System) Note: As the UPS single module outputs are connected in parallel, the system checks that
the inverter control circuits are perfectly synchronized with one another and with the bypass in terms of
both frequency and phase, and that they have the same output voltages. Current supplied to the load is
automatically divided among UPSs. A warning message appears while synchronization is in progress.
Mains abnormal
When the mains fails or is abnormal, the rectier will stop working automatically, and the system will
transfer to battery output (through inverter). The length of the operation time in battery mode depends
on the load and the battery capacity. During this period, if the battery voltage falls to the EOD voltage and
the mains still has not been recovered, the inverter will stop working automatically, and the UPS operator
control and display panel will display corresponding alarm messages. If the system uses split-bypass
conguration and the bypass is normal, the system will transfer to bypass.
Mains recovery
When the mains resumes normal within allowable time, the rectier will start automatically and supply the
load and charge the battery again. Therefore, the power supply to the load will not be interrupted.
Battery disconnection
To disconnect the external battery from the UPS system for maintenance, use the external isolating switch.
At this time, except for the battery backup function upon mains failure, other functions and all the steady
state performance of the UPS will not be aected.

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Vertiv™ Liebert EXS 80kVA UPS User Manual
1 Overview
UPS module failure
In case of inverter failure and output fuse blowout, the load will automatically transfer to the bypass, and
the output power supply will not be interrupted. In this situation, please contact the local customer service
center of Vertiv for technical support.
(Parallel System) In the event of a fault in a UPS module, it will automatically exit from the parallel system.
If the system is still capable of providing the required load, the remaining modules will continue to supply
the load with no interruption. If the remaining modules are no longer capable of fullling the power
requirements, the load will automatically transfer to the bypass.
Overload
If the inverter is overloaded or the inverter current remains outside the specications longer than the
specied time, the load will automatically transfer to the bypass without power interruption. If both the
overload and the current are reduced to a level within the specied range, then the load will be transferred
back to the inverter. In case of output short circuit, the load will be transferred to the bypass, and the
inverter will shut down. Five minutes later, the inverter will start up automatically. If the short circuit is
removed at this point, the load will be transferred back to the inverter. The transfer is determined rst of all
by the features of the protective device of the system.
In the above two situations, the UPS operator control and display panel will display alarm messages.
(Parallel System) The control logic system constantly monitors load requirements and controls the power
supplied by each UPS module. In the event that an overload condition is sustained for greater than a
preset time, the load will transfer to the bypass, when the number of active modules is unable to satisfy
load requirements. The load returns to the inverter if the power is reduced to a value that can be sustained
by the number of active modules in the system.
Maintenance bypass
The UPS has a second bypass circuit, i.e. maintenance bypass, which provides a safe working environment
for the engineers to provide regular maintenance or repair to the UPS system and at the same time provide
unregulated mains supply to the loads. The maintenance bypass can be manually selected through the
maintenance bypass switch, and it can be disconnected by turning the switch to OFF.
WARNING: If the UPS system is composed of two or more UPS modules, and when the load
capacity exceeds the single module capacity, do not use the internal maintenance bypass
switch.
1.2.4 UPS Power Supply Switch Configuration
The UPS has four switches: rectier input switch Q1, bypass input switch Q2, maintenance bypass switch
Q3, output switch Q5.
Figure 1-2 describes the block diagram of the UPS module. The UPS is available in split bypass
conguration (that is, the bypass adopts independent mains input) and common input conguration.
If the system adopts common input conguration, the UPS has copper shorting bar of common input
conguration, and the bypass input switch (Q2) and rectier input switch (Q1) would be linked together.
If the system adopts split bypass conguration, just remove the copper shorting bar of common input
conguration of the UPS.
During the normal operation of the UPS, except for the maintenance bypass switch Q3, other switches shall
be closed.

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Vertiv™ Liebert EXS 80kVA UPS User Manual
1 Overview
Figure 1-2 UPS power supply switch configuration
Bypass input
Mains input
Neutral line input
Battery BCB
Rectifier Inverter
Charger
UPS
Maintenance bypass
sw itch Q3
Bypass input switch Q 2
Rectifier input
switch Q1
Bypass automatic switch
Inverter
Output
switch Q5
UPS output
Shorting copper bar
of common input
configuration DC bus
switch
N line switch QN
NOTE: The mains input and bypass input share the same neutral line.
1.2.5 Battery Circuit Breaker (BCB)
The external battery shall be connected to the UPS through the BCB. The BCB box is an option, which
shall be installed near the battery. The BCB is closed manually, and has a shunt tripping coil. When the
system is faulty and the BCB needs to be disconnected, the UPS control circuit will send a signal to the
shunt tripping coil so as to trip the BCB. It also has a magnetic trip facility for overload protection and short
circuit protection.
1.3 Parallel System
Up to four UPS modules can be connected in parallel to increase the system capacity and reliability. The
load is equally shared between the paralleled UPS modules.
Moreover, two UPS modules or parallel system can comprise a dual bus system. Each parallel system
has independent output. Output synchronization is achieved through the LBS cable or LBS device, thus
enabling seamless load transfer between the two parallel systems through the STS device.
1.3.1 Parallel System Features
1. The hardware and software of parallel system are completely the same as those of the single module.
The parallel system conguration is achieved through settings in conguration software.
2. Parallel cables are connected in a ring, providing both system reliability and redundancy.
3. The total load of the parallel system can be queried from the LCD of each UPS.

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Vertiv™ Liebert EXS 80kVA UPS User Manual
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1.3.2 Parallel System Requirements
A group of paralleled modules behave as if it were one large UPS with the advantage of presenting higher
reliability. To ensure that all modules are equally utilised and to comply with relevant wiring rules, the
following requirements apply:
1. All UPS modules must be the same series, and connect to the same bypass source.
2. The N line of bypass and rectier input sources must be connected to the same neutral line terminal.
3. Any RCD, if installed, must be of an appropriate setting and located upstream of the common neutral
line input terminal. Alternatively, the device must monitor the protective earth current of the system.
Refer to WARNING! High earth leakage current.
4. For parallel system consists of two or more UPS modules, the bypass load sharing inductors (optional)
should be selected.
1.4 UPS States and Operating Modes
For the LED indicators introduced in this section, refer to 4.1.1. LED Indicators.
The operating modes are as follows:
• Normal mode
• Battery mode
• Bypass mode
• Maintenance bypass mode
• ECO mode
• Parallel redundancy mode (system expansion)
• Frequency converter mode
• LBS mode
Normal mode
When the mains input is normal, the load is supplied with voltage-stabilizing and frequency-stabilizing
power by the mains after processing of the rectier and the inverter, and meanwhile, the charger is
charging the battery. The operation mode is Normal mode.
In Normal mode, the run indicator (green) is on, the alarm indicator is o, and the buzzer is silenced.
Figure 1-3 Schematic diagram of normal mode
Rectifier input switch
Mains input
Battery charger
Output switch
InverterRectifier
UPS output
Battery
Inverter switch
Output switch
InverterRectifier
UPS output
Battery
Inverter switch

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Battery mode
Upon mains failure or voltage out of range, the rectier and internal charger will stop running, and the
battery will supply power to the load through the inverter. When the mains is recovered, the system will
automatically transfer back to the normal mode without any manual intervention, and the power to the load
will not be interrupted.
In Battery mode, the run indicator (green) is on, alarm indicator (yellow) is on, and the buzzer beeps every
second. The 'Current' page in LCD will display 'On Battery'.
NOTE: 1. The battery has been fully charged before delivery. However, some loss of capacity is
inevitable during transportation and storage. Therefore, it is important to charge the battery for eight
hours before putting the UPS into operation for the first time, to ensure it can provide adequate backup
time.
2. The Liebert EXS UPS supports cold start function, while this function is activated, UPS can be
powered using battery mode without availability of input power supply. Therefore, the battery power
can also be utilized independently for improving the system availability.
Figure 1-4 Schematic diagram of battery mode
Rectifier input switch
Mains input
Battery charger
Output switch
InverterRectifier
UPS output
Battery
Inverter switch
Output switch
InverterRectifier
UPS output
Battery
Inverter switch
Bypass mode
If the overload overtime, inverter or rectier 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 rectier is normal, the internal charger will charge the battery.
In Bypass mode, the run indicator (green) is on, alarm indicator (yellow) is on, and the buzzer beeps every
second. The 'Current' page in LCD will display 'On Bypass'.
Figure 1-5 Schematic diagram of bypass mode
Bypass input switch
Bypass input
Static switch
Output switch
UPS output
Bypass automatic switch
NOTE: In the event of a mains failure or if the mains voltage is outside tolerance while the UPS is in
Bypass mode, the UPS will shut down and the power supply to the load will be interrupted.

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Vertiv™ Liebert EXS 80kVA UPS User Manual
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Maintenance Bypass mode
If the UPS maintenance or service is required, you may use the manual maintenance bypass switch to
transfer the load to maintenance bypass, with no interruption in power to the load. This maintenance
bypass switch is tted in all UPS modules and rated for full load of a single module.
Figure 1-6 Schematic diagram of maintenance mode
Maintenance bypass switch
Bypass input
Maintenance bypass
UPS output
Bypass input switch
Rectifier input switch
Bypass input
Mains input
Battery charger
Output switch
InverterRectifier
Static switch
UPS output
Battery
Inverter switch
Bypass automatic switch
NOTE: In the event of UPS malfunctions or abnormal operation, contact your nearest Vertiv branch
oice or local service center. NEVER attempt to repair the UPS yourself, as this may result in injury to
personnel and/or damage to equipment.
ECO mode
If ECO mode is selected, all power switches and the battery switches are closed except for the
maintenance bypass switch, and the system prefers to put the load on the bypass, to achieve the aim
of energy-saving. When the bypass supply is within the range of normal frequency and normal voltage
(adjustable), the load is powered by the bypass, with the inverter on stand-by; when the voltage and/or
frequency of the bypass supply are beyond the pre-dened and adjustable limits, the system will transfer
to the inverter output, and the transfer time for switching from bypass to inverter is less than 4ms. In this
mode, the system can normally charge the battery.
ECO mode is an energy-saving operating mode. When using the UPS to supply equipment that is no
sensitive to mains power quality, ECO mode may be used to reduce power losses.
Figure 1-7 Schematic diagram of ECO mode
Maintenance bypass switch
Bypass input
Maintenance bypass
UPS output
Bypass input switch
Rectifier input switch
Bypass input
Mains input
Battery charger
Output switch
InverterRectifier
Static switch
UPS output
Battery
Inverter switch
Bypass automatic switch
NOTE: 1. In ECO mode, if the bypass fails or the bypass voltage goes outside normal limits, the UPS will
transfer to Normal mode (providing the output is not overloaded). However, if the bypass fails or the
bypass voltage goes outside normal limits while the output is overloaded, the UPS will not transfer to
Normal mode, but will shut down the Bypass.
2. In ECO mode, the eiciency of the UPS is increased to 99%.
3. In ECO mode, the load is not protected against mains distortion.