Vertiv Liebert EXM2 User manual

Vertiv™ Liebert® EXM2
User M anual
100 kVA to 250kVA UPS

Vertiv™ | Liebert® EXM2 UPS User Manual
T e c hnic a l S up p ort S ite
If you encounter any installation or operational issues with your product, check the pertinent section of this
manual to see if the issue can be resolved by following outlined procedures.
Visit https://www.vertiv.com/en-us/support/ for additional assistance.
The information contained in this document is subject to change without notice
and may not be suitable for all applications. While every precaution has been
taken to ensure the accuracy and completeness of this document, Vertiv
assumes no responsibility and disclaims all liability for damages resulting from
use of this information or for any errors or omissions. Refer to other local
practices or building codes as applicable for the correct methods, tools, and
materials to be used in performing procedures not specifically described in this
document.
The products covered by this instruction manual are manufactured and/or sold
by Vertiv. This document is the property of Vertiv and contains confidential
and proprietary information owned by Vertiv. Any copying, use or disclosure of
it without the written permission of Vertiv is strictly prohibited.
Names of companies and products are trademarks or registered trademarks of
the respective companies. Any questions regarding usage of trademark names
should be directed to the original manufacturer.
Vertiv™ Liebert® EXM2 UPS User Manual

TA B L E O F C O N TE N TS
1 Im p ortant Sa fety Instructions 1
2 O ve rview 5
2.1 Features 5
2.2 Design Concept 6
2.2.1 System Design 6
2.2.2 Bypass 7
2.2.3 System Control Principle 7
2.2.4 UPS Power Supply Switch Configuration 9
2.2.5 Battery Circuit Breaker (BCB) 10
2.3 Parallel System 11
2.3.1 Parallel System Features 11
2.3.2 Parallel System Requirements 11
2.4 Operation Modes 12
2.5 Battery Management 18
2.5.1 Normal Function 18
2.5.2 Advanced Function 19
2.5.3 Battery Temperature Compensation 19
2.6 Battery Protection 20
3 M echanical Installation 21
3.1 Precautions 21
3.2 Transportation 22
3.3 Tools 23
3.4 Unpacking 25
3.5 Initial Inspection 27
3.6 Environmental Requirement 28
3.6.1 UPS Location Selection 28
3.6.2 Battery Location Selection 28
3.6.3 Storage 28
3.7 Mechanical Requirement 29
3.7.1 Composition 29
3.7.2 Moving Cabinet 29
3.7.3 Clearance 29
3.7.4 Cable Access Mode 29
3.8 Installation Drawings 30
4 Electrical Installation 33
4.1 Wiring of Power Cable 33
4.1.1 System Configuration 33
4.1.2 Maximum Steady State AC and DC Currents 34
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4.1.3 Recommended CSA of UPS Cable 34
4.1.4 Selection of UPS I/O and Battery Switch 35
4.1.5 Distance Between the UPS Connection Point and The Floor 35
4.1.6 Notes 35
4.1.7 Power Cable Connecting Terminal 35
4.1.8 Protection Ground 35
4.1.9 External Protective Device 36
4.1.10 Power Cable Connection Steps 38
4.2 Wiring of Signal Cable 44
4.2.1 Overview 44
4.2.2 Dry Contact Port J6 44
4.2.3 Dry Contact Port J7 45
4.2.4 Programmable Dry Contact Port J8 48
4.2.5 REPO Port 49
4.2.6 Host Communication Port 50
4.2.7 Parallel and LBS Communication Ports 50
4.2.8 Intellislot Port 50
4.2.9 Signal Cable Connection Steps 50
5 O p erator Control a nd Disp la y Pa ne l 53
5.1 Introduction 53
5.2 Navigating Through the Vertiv Liebert EXM2 Touchscreen Control Panel 55
5.2.1 Access Level Log-In 55
5.2.2 Vertiv™Liebert® EXM2 Touchscreen Control Panel Components 56
5.3 Operation 62
5.3.1 Log In to the Vertiv™ Liebert® EXM2 Touchscreen Control Panel 62
5.3.2 Customizing the Display 63
5.3.3 Operator Controls 70
5.4 Viewing UPS Status 76
5.4.1 Viewing UPS Data with the Status Gauge 76
5.4.2 Viewing UPS Data with the Status Panel 80
5.4.3 Logs—Alarms and Events 86
5.5 Viewing UPS Component Status 88
5.6 Status Bar Component 91
5.6.1 Status Bar Messages 91
5.7 Alarm List 95
6 S ing le UPS O p era tion Int rod uction 9 9
6.1 Brief Introduction 99
6.1.1 Precautions 99
6.1.2 Power Switch 100
6.2 UPS Startup Procedures 102
6.2.1 Startup Procedures in Normal Mode 102
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6.2.2 Startup Procedures in ECO Mode 105
6.2.3 Startup Procedures in Battery Mode (Battery Cold Start) 106
6.3 Procedures for Transfer between Operation Modes 107
6.3.1 Transfer from Normal Mode to Battery Mode 107
6.3.2 Transfer from Normal Mode to Bypass Mode 107
6.3.3 Transfer from Bypass Mode to Normal Mode 108
6.3.4 Transfer from Normal Mode to Maintenance Mode 108
6.3.5 Transfer from Maintenance Mode to Normal Mode 109
6.4 Battery Test Procedures 110
6.5 UPS Shutdown Procedures 112
6.5.1 Procedures for Completely Powering Down UPS 112
6.5.2 Procedures for Completely Powering Down UPS while Maintaining Power to Load 112
6.6 EPO Procedures 112
6.7 UPS Reset Procedures after EPO 113
6.8 Automatic Restart 113
6.9 Selecting Language 114
6.10 Changing Current Date and Time 115
6.11 Control Password 116
7 Battery 117
7.1 Introduction 117
7.2 Safety 117
7.3 UPS Battery 120
7.4 Precautions for Installation Design 120
7.5 Battery Installation Environment and Number of Batteries 122
7.5.1 Installation Environment 122
7.5.2 Number of Batteries 123
7.6 Battery Protection 123
7.7 Battery Installation 124
7.8 Design of Battery Room 125
7.9 Common Battery String 126
7.10 Connections between battery compartments and UPS 127
7.11 BCB Box (Optional) 128
7.12 Battery Ground Fault Detector (Option) 132
7.13 BCB Reference Current and Connection 133
7.14 Battery Maintenance 134
7.15 Disposal of Used Battery 134
8 Pa ra llel S yst em a nd L BS S yst em 13 5
8.1 General 135
8.2 System Installation Procedures 135
8.2.1 Preliminary Checks 135
8.2.2 Cabinet Installation 135
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8.2.3 External Protective Device 137
8.2.4 Power Cable 137
8.2.5 Parallel Cable 138
8.2.6 Remote EPO 139
8.3 Operation Procedures for Parallel System 140
8.3.1 Startup Procedures in Normal Mode 140
8.3.2 Maintenance Bypass Procedures 141
8.3.3 Procedures for Isolating One UPS Module from Parallel System 142
8.3.4 Procedures for Inserting One Isolated UPS Module in Parallel System 143
8.3.5 Procedures for Completely Powering Down UPS 143
8.4 LBS System 144
8.4.1 Cabinet Installation 144
8.4.2 External Protective Device 145
8.4.3 Power Cable 145
8.4.4 LBS Cable 146
9 O p tions 14 9
9.1 Option List 149
9.2 Option Introduction 150
9.2.1 Optional Side Cabinet 150
9.2.2 Bypass Short-circuit Withstand Option 153
9.2.3 Battery Temperature Sensor 154
9.2.4 Battery Ground Fault Kit 154
9.2.5 Seismic Anchor Kit 155
9.2.6 IS-UNITY-DP Card 158
9.2.7 IS-UNITY-LIFE Card (Available in Specific Regions only) 158
9.2.8 SIC Card (Available in Specific Regions only) 159
9.2.9 UF-RS485 Card 160
9.2.10 IS-Relay Card 161
9.2.11 BCB Box 162
9.2.12 Parallel Cable 162
9.2.13 LBS Cable 162
9.2.14 Back-feed Contactor Option 162
9.2.15 Top Fan Kit 163
9.2.16 Input/output Switch Kit 164
9.2.17 IP21 Option 165
9.2.18 IP31 Option 166
10 C om m unic a tion 1 6 7
10.1 SNMP Protocol Communication 167
10.2 Modbus Protocol Communication 167
10.3 Dry Contact Communication 167
10.3.1 Communication Through IS-Relay Card 168
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Vertiv™ Liebert® EXM2 UPS User Manual

10.3.2 Communication Through Dry Contact Port 168
11 S e rv ic e and M a intena nc e 16 9
11.1 Safety 169
11.2 Key Components and Service Life of UPS 169
11.2.1 Life Parameters and the Proposed Replacement Time of Key Components 169
11.2.2 Replacement of Air Filter 170
11.3 Maintenance of UPS and Options 171
12 Specifications 173
12.1 Conformance and Standards 173
12.2 Environmental Characteristics 173
12.3 Mechanical Characteristics 174
12.4 Electrical Characteristics (Input Rectifier) 174
12.5 Electrical Characteristics (Intermediate DC Circuit) 174
12.6 Electrical Characteristics (Inverter Output) 175
12.7 Electrical Characteristics (Bypass Input) 176
12.8 Efficiency and Loss 176
Appe nd ices 177
Appendix A: Technical Support and Contacts 177
Appendix B: Glossary 178
Appendix C: Hazardous Substances and Content 179
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1 Im portan t S afe ty In stru ction s
Personne l S a fety
1. This product must be installed and commissioned by professional engineers of the manufacturer or its
authorized agent. Failure to observe could result in product malfunction or personal 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 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 fire, as it may explode and jeopardize
personnel safety when exposed to flame.
Pr od uc t S a fe ty
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 specified 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 specifications
•Subject to vibrations or shocks
•Where conductive dusts, corrosive gases, salts, or flammable gases are present
•Near heat sources or strong electromagnetic interferences
Disclaim e r
Vertiv disclaims any and all responsibility or liability for the defects or malfunction caused by:
•Application range or operating environment outside the specifications
•Unauthorized modification, improper installation or operation
•Force majeure
•Other actions not in compliance with the instructions in this manual
Safe ty Prec a ution
This manual contains information concerning the installation and operation of the Vertiv™Liebert® EXM2 100kVA~250kVA
UPS.
Read this manual thoroughly before installing, using and servicing the UPS.
IM P O R T A N T ! T h e UP S w ith s tan dard co nfigu ratio n is a categ o ry C 3 pro du ct fo r co m merc ial an d
in du strial ap plicatio n in the s eco nd en viro n m en t. In stallatio n res trictio n s o r ad ditio n al m eas u res m ay
b e n ee ded to p reven t d is tu rb an ces .
IM P O R T A N T ! T h e UP S addin g C2 E M C o p tio n b as ed o n th e s tan dard c o nfigu ratio n is a categ o ry C 2
pro d uct fo r a res idential en viro n m en t o r co mm erc ial an d in d us trial applicatio n in th e s eco n d
enviro n m en t.
1 Important Safety Instructions 1
Vertiv™ Liebert® EXM2 UPS User Manual

Co n fo rm ity an d s tan dard s
This product complies with CE 2006/95/EC (low voltage safety) and 2004/108/EC (EMC), EMC standards of Australia and
New Zealand (C-Tick), and the following UPS product standards:
•IEC62040-1 General safety requirements for UPS
•IEC62040-2-EMC
•IEC62040-3 Performance requirements and test methods
For details, refer to Specifications .
Continued compliance requires installation in accordance with these instructions and the use of manufacturer approved
accessories only.
W A R N IN G ! H igh earth leak ag e cu rren t: E arth co n n ectio n is critical b efo re co n n ectin g th e in p u t
s u pp ly (in clu din g b o th m a ins s u p ply an d b attery).
T h is equ ip m en t is in s talled w ith an E M C f ilter.
E arth leak a ge cu rren t is les s th an 3000m A .
T ran sien t an d s tead y s ta te earth leak age cu rren ts , w h ich m ay o c cu r w h en th e e qu ipm en t is
s tarted, s h o u ld b e tak en in to acco u n t in th e s elec tio n o f in s tan taneo u s R CCB s o r R CD d evices .
R C CB w h ic h is s en sitive to u n idirectio n a l DC p u ls e (cla ss A ) an d in s en s itive to tran s ien t s tate
cu rren t p u ls e m u s t b e s ele cted .
N o te als o that the earth leak age c urren ts o f th e lo ad w ill b e carried b y th e R CCB s o r R CDs.
T h e eq u ipm en t m us t b e earth ed in acco rdan ce with th e lo cal electric al co de o f practic e.
W A R N IN G ! T h e s electio n o f th e u ps tream dis tribu tio n p ro tectio n eq u ipm en t o f th e UP S s hall
be s elected in ac co rd ance w ith th e details and s h all co m ply w ith th e lo cal electric al regu latio ns .
W A R N IN G ! B ack feed ing p ro tectio n
T h is UP S is fitted w ith a dry co n tact clo s u re sig nal fo r u s e w ith an external au to m atic
dis co nn ect d evice (s u pplied by o th ers ) to p ro tect ag ains t b ac k feed in g vo ltage in to th e
in co m in g term in al th ro u g h th e rectifier o r b yp as s s tatic s w itc h circu it. A lab el m u s t b e add ed at
all extern al in co m ing p rim ary su pp ly d is co n n ec t d evice to w arn service p erso n n el th at th e c ircu it
is co n n ected to a UP S . T h e text o f th e lab el h as th e fo llo win g m ean in g: R is k o f vo ltag e
back feed! Iso late th e UP S , th en ch ec k fo r h azard o u s vo ltag e betw een all term in als in clu d ing th e
pro tective earth befo re w o rk in g o n th is circu it.
User s erviceab le co m po nen ts (F o r service p ers o n nel)
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.
1 Important Safety Instructions
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Vertiv™ Liebert® EXM2 UPS User Manual

B attery vo ltag e exceed s 400Vdc (F o r s ervice pers o nn el)
All physical battery maintenance and servicing procedures requires the use of a tool/key and should be carried out only by
trained personnel.
Take special care when working with the batteries associated with this UPS. When connected, the battery terminal voltage
will exceed 400Vdc and is potentially lethal.
Battery manufacturers supply details of the necessary precautions to be observed in working on, or in the vicinity of, a large
bank of battery cells. These precautions should always be followed implicitly. Particular attention should be paid to the
recommendations concerning local environmental conditions and the provision of protective clothing, first aid and fire-
fighting facilities.
G e n eral s afety (F o r u s ers )
Like other types of large power equipment, the UPS and battery circuit breaker box/battery cabinet have high voltage
inside. Because the components with high voltage can be accessed only when the front door is opened, the risk of
contacting high voltage has been minimized. This equipment meets the IP20 standard, and other safety shields are
provided inside the equipment.
There will not be any risk when operating this equipment according to the general instructions and the steps recommended
in this manual.
M u ltip le p o w er in p u ts (F o r u s ers )
This UPS system receives power from more than one source. Disconnection of all AC source and the DC source is required
before servicing.
This UPS has several circuits that are energized with high AC as well as DC voltages. Check for voltage with both AC and
DC voltmeters before working within the UPS.
W A R N I N G ! W h en th e in tern al fu s e o f th e UP S is d am ag ed , it m u s t b e rep lac ed w ith fu se o f th e
s am e elec tric p aram eters b y q u alified pers o n n el.
IM P O R T A N T ! B eside the c o mm u nicatio n b o ard is a s tatic s ens itive area, an E SD -pro o f actio n is critical
befo re co n tactin g w ith th is area.
W A R N I N G ! T h e u s er m u s t s elec t an a ppro p riate M C CB to p ro tec t ag ain s t s h o rt c irc u it an d
o verlo ad fo r th e b attery. It is reco m m en ded to ad o pt Vertiv B CB to pro vide a b etter so lu tio n .
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1 Important Safety Instructions
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Vertiv™ Liebert® EXM2 UPS User Manual

2 O verview
This chapter briefly introduces the features, design concept, parallel system, operation mode, battery management and
battery protection of the Vertiv™ Liebert® EXM2 UPS 100kVA~250kVA (UPS for short).
2.1 Fe a tu re s
The UPS is connected between a critical load (e.g. a computer) and mains power to provide high quality power for the
loads. The UPS has the following advantages:
A u g m en t p o w er q u ality
The UPS protects its output against the input power change through the intelligent controller.
P ro vide m ains failu re pro tectio n
If the input power fails, the UPS will work in battery mode, and the power supply to the loads will not be interrupted.
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Vertiv™ Liebert® EXM2 UPS User Manual

2.2 Desig n C on cept
2.2.1 S y stem Des ign
This section introduces the working principle of the UPS single module. The UPS adopts AC-DC-AC converter (as shown in
Figure 2.1 below). The first stage conversion (AC-DC) adopts three-phase high frequency rectifier to convert the three-
phase input voltage into stable DC bus voltage.
F igu re 2.1 B lo ck diagram fo r w o rk in g prin ciple o f U P S s in gle m o du le
N O . D e s c rip t ion N O . D es c r ip t ion
1 Input 9 Rectifier input switch
2 Output 10 Rectifier
3 Bypass input 11 Inverter
4 Maintenance bypass switch 12 Inverter switch
5 Maintenance bypass 13 Output
6 Static switch 14 UPS Battery
7 Bypass input switch 15 Battery charger
8 Mains input 16 Output switch
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Vertiv™ Liebert® EXM2 UPS User Manual

The UPS has its own battery charger and adopts advanced temperature compensation technology to effectively prolong
the battery service life. The inverter adopts three level T-type IGBT topology and uses advanced SVPWM control
technology to derive the stable AC voltage from the DC bus voltage. When the mains is normal, the rectifier and inverter
work together to supply the loads and charge the battery.
When the mains is abnormal, the rectifier stops working, and the battery supplies power to the loads through the inverter. 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 configuration 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.
2.2.2 By pass
Through the intelligent control of the 'Static Switch' module (as shown in Figure 2.1 on the previous page) containing the
controllable electronic switch, the loads can be supplied by the inverter or the bypass. In normal situation, the loads are
supplied by the inverter, in this 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 'Static 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
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.
N O T E : W h en th e lo ad is s u pp lied b y th e b yp ass o r m ain ten a n ce b yp as s , th e p o w er s u p ply qu ality w ill
b e u n certain .
2.2.3 S y stem C ontro l Prin ciple
N o rm al o peratio n
Normal mode: It means that the UPS has normal input mains, the rectifier and inverter operate normally, the load is supplied
by the inverter, the battery circuit breaker is closed, and the battery is in stable floating charge state.
P arallel SystemAs 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.
M ain s abn o rm al
When the mains fails or is abnormal, the rectifier will stop working automatically, and the load will be catered by the 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 configuration and the bypass is normal, the system will transfer to bypass.
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Vertiv™ Liebert® EXM2 UPS User Manual

M ain s reco very
When the mains resumes normal within allowable time, the rectifier will start automatically and supply the load and charge
the battery again. Therefore, the power supply to the load will not be interrupted.
B attery dis co n n ectio n
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 affected.
UP S m o d u le failu re
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 fulfilling the power requirements, the load will automatically transfer to the
bypass.
O verlo ad
If the inverter is overloaded or the inverter current remains outside the specifications (refer to Table 12.6 on page175)
longer than the specified 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 specified 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 first 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.
P arallel SystemThe 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.
M ainten an ce b ypass
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.
W A R N IN G ! If th e UP S s ys tem is co m po s ed o f tw o o r m o re UP S m o du les and w h en th e lo ad
capac ity exceed s th e s in gle m o d u le capacity, d o n o t u se th e in tern a l m ain te n an ce b yp ass
sw itch.
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Vertiv™ Liebert® EXM2 UPS User Manual

2.2.4 UP S P ow er S upply S w itch C onfiguration
The UPS has four switches: rectifier input switch Q1, bypass input switch Q2, maintenance bypass switch Q3, and output
switch Q5.
N O T E: S witch es (Q 1, Q 2, and Q 5) are o ptio n al.
Figure 2.2 below describes the block diagram of the UPS module. The UPS has split bypass configuration (i.e., the bypass
adopts independent mains input) and common input configuration. If the system adopts common input configuration, the
UPS has shorting copper bar of common input configuration, and the bypass input switch (Q2) and rectifier input switch (Q1)
would be linked together. If the system adopts split bypass configuration, just remove the shorting copper bar of common
input configuration of the UPS.
During the normal operation of the UPS, except for the maintenance bypass switch Q3, other switches shall be closed.
F ig u re 2.2 UP S p o w er s u p ply s witch c o n fig u ratio n
N O . D e s c rip t ion
1 Bypass input
2 UPS
3 Maintenance bypass switch Q3
4 Static switch
5 Shorting copper bar of common input configuration
6 Bypass input switch Q2
7 Mains input
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Vertiv™ Liebert® EXM2 UPS User Manual

N O . D e s c rip t ion
8 Rectifier input switch Q1
9 Rectifier
10 DC bus
11 Inverter
12 Inverter switch
13 Output switch Q5
14 Charger
15 UPS output
16 Neutral line input
17 Battery
18 BCB
N O T E: Q 1, Q 2 an d Q 5 are o p tio n al w h ile Q 3 is s tan dard .
N O T E : T h e m ain s in p u t a n d b yp as s in pu t s h are th e s am e n eu tra l lin e.
2.2.5 Battery C ircuit Breaker (BCB)
The external battery shall be connected to the UPS through the BCB. The BCB box is optional, which shall be installed near
the battery. The BCB is closed manually. The BCB 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.
2 Overview
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Vertiv™ Liebert® EXM2 UPS User Manual

2.3 Pa ra llel System
Up to six UPS modules can be parallel-connected to form a parallel system 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 or single modules through the STS device.
2.3.1 Parallel S y s tem Featu res
1. The hardware and software of parallel system are completely the same as those of the single module. The
parallel system configuration is achieved through settings in configuration 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 each UPS module's TOUCHSCREEN.
2.3.2 Parallel S y s tem Requirem en ts
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 utilized 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 rectifier 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: Earth connection is critical before connecting the input supply (including both
mains supply and battery). on page2
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Vertiv™ Liebert® EXM2 UPS User Manual

2.4 O p era tion M ode s
The UPS has the following operation modes:
•Normal mode
•Battery mode
•Automatic restart mode
•Bypass mode
•Maintenance mode
•ECO mode
•Parallel redundancy mode (system expansion)
•Frequency converter mode
•LBS mode
•Dynamic online mode
N o rm al m o de
As shown in Figure 2.3 below , the UPS inverter continuously supplies the critical AC load. The rectifier draws power from
the commercial AC source and converts it into DC power for the inverter and the battery charger. The battery charger
maintains the battery in a fully charged and optimum operational condition. The inverter converts the DC power into clean
and regulated AC power which is supplied to the critical load (conditioned line).
F igu re 2.3 S ch em atic d iag ram o f n o rm al m o d e
N O . D e s c rip t ion
1 Mains input
2 Rectifier
3 Inverter
4 Inverter switch
5 Output switch
2 Overview
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Vertiv™ Liebert® EXM2 UPS User Manual