Vertiv Liebert EXL S1 Assembly instructions

Liebert®
EXLS1™
Installer Guide
400kVA – 1200kVA, 60Hz,Three-phase UPS,
Single-moduleandMulti-module(DistributedBypass)

Vertiv | EXL S1™ Installer Guide
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If you encounter any installation or operational issues with your product, check the pertinent
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Visit https://www.VertivCo.com/en-us/support/ for additional assistance.
The information contained in this document is subject to change
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and disclaims all liability for damages resulting from use of this
information or for any errors or omissions. Refer to other local
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tools, and materials to be used in performing procedures not
specifically described in this document.
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TABLE OF CONTENTS
1 Important Safety Instructions 1
2 Mechanical Installation 3
2.1 Pre-installation Planning 3
2.2 Preliminary Checks 3
2.3 Environmental Considerations 3
2.3.1 UPS Room 3
2.3.2 Storing the UPS and Batteries for Delayed Installation 5
2.3.3 Installation Altitude 5
2.4 Positioning 5
2.4.1 Moving the Cabinets 5
2.4.2 Clearances 6
2.4.3 Raised-Floor Installations 6
2.4.4 Floor Anchors—Optional 6
2.4.5 Kick Plate Installation—Standard 6
2.4.6 Special Considerations for 1+N Parallel Systems 6
2.4.7 Unpacking and Unloading the Cabinet from the Pallet 7
2.5 System Configuration 8
2.6 Power-cable Busbars 10
2.7 Attaching Input/Output Cabinets 14
2.7.1 Moving Input/Output Cabinets into Position 14
3 UPS Electrical Installation 15
3.1 External Protective Devices 15
3.2 Power Cables 15
3.3 Sizing the Input Breaker that Feeds the UPS 16
3.3.1 Single or Dual Input Feeds 16
3.3.2 Automatic Transfer Switches 16
3.4 Input Power Cable Connection 16
3.4.1 Equipment Ground 17
3.5 DC Power Connections 18
3.6 Control Cable and Communication 19
3.6.1 Slots for Liebert® IntelliSlot™ Cards—SLOT1 and SLOT3 21
3.6.2 Slot for LIFE Services Products—SLOT2 21
3.6.3 Serial Interface for Liebert® LIFE™ Services Cards (Serial Input/Output)—XP6 21
3.6.4 Connector for REPO (Input and Status)—AP30-XP10 22
3.6.5 Customizable Output Dry Contacts—AP30/AP202 XP12 22
3.6.6 Customizable Input Dry Contacts—AP30/AP202 XP11 25
3.6.7 Connector for Parallel UPS Connection—AP30-XP71A, 71B, AP30-XP72A, 72B 27
3.6.8 RJ-45 Interface for Synchronization with External Signal—AP30-XP31 28
3.6.9 UPS Control Contacts with Battery Cabinet or Module Battery Disconnect 28
3.6.10 UPS Control Contacts with Global Maintenance Bypass 28
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3.7 Configuring Ground Connections 29
3.7.1 Three-wire Input Connections 29
3.7.2 Recommended Grounding Configuration, Battery Systems 31
3.7.3 High-Resistance Ground Systems 32
3.8 Distributed Static Switch (1+N) System Cabling Layouts 32
3.9 Top Entry Low-Voltage 33
3.10 Bottom Entry Low-Voltage 33
4 Optional Equipment 35
4.1 Options 35
4.2 Rectifier Feed Breaker (RFB) 36
4.2.1 Remote Back-feed Breaker 36
4.3 Multi-Module System Options and Accessories 37
4.3.1 Paralleling Cable Kit 38
4.3.2 Multi-Bus Synch Module (MBSM) 38
5 Specifications 39
Appendices 53
Appendix A: Technical Illustrations 53
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1 IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions that should be followed during installation of your Liebert®
EXLS1™ UPS. Read this manual thoroughly, paying special attention to the sections that apply to your
installation, before working with the UPS. Retain this manual for use by installing personnel.
WARNING! Risk of electrical shock. Can cause personal injury or death. This UPS has several
circuits that are energized with high DC as well as AC voltages. Check for voltage with both AC
and DC voltmeters before working within the UPS. Check for voltage with both AC and DC
voltmeters before making contact. Only properly-trained and qualified personnel wearing
appropriate safety headgear, gloves, shoes and glasses should be involved in installing the UPS
or preparing the UPS for installation. When performing maintenance on any part of the
equipment under power, service personnel and test equipment should be standing on rubber
mats. In case of fire involving electrical equipment, use only carbon dioxide fire extinguishers or
those approved for use in fighting electrical fires.
WARNING! Extreme caution is required when performing installation and maintenance. Special
safety precautions are required for procedures involving handling, installation and maintenance
of the UPS system. Observe all safety precautions in this manual before handling or installing
the UPS system. Observe all precautions in the Operation and Maintenance Manual, SL-26090,
before as well as during performance of all maintenance procedures. Observe all DC safety
precautions before working on or near the DC system.
WARNING! Risk of heavy unit falling over. Improper handling can cause equipment damage,
injury or death. Exercise extreme care when handling UPS cabinets to avoid equipment damage
or injury to personnel. Locate the center of gravity symbols and determine the unit’s weight
before handling each cabinet. Test lift and balance the cabinets before transporting them.
Maintain minimum tilt from vertical at all times. Slots at the base of the module cabinets are
intended for forklift use. Base slots will support the unit only if the forks are completely
beneath the unit. Read all of the following instructions before attempting to move, lift or
remove packaging from the unit, or to prepare the unit for installation. The UPS module weighs
up to 4667 lb. (2117 kg).
1

WARNING! Risk of electrical shock and fire. Can cause equipment damage, personal injury or
death. Only normal safety precautions are necessary under typical operation and with all UPS
doors closed. The area around the UPS system should be kept free of puddles of water, excess
moisture and debris. Only test equipment that is designed for troubleshooting should be used.
This is particularly true for oscilloscopes. Always check with an AC and DC voltmeter to ensure
safety before making contact with the UPS or using tools to work on any UPS component.
Dangerously high potential electric charges may exist at the capacitor banks and at the DC
connections even when input power is turned Off. All wiring must be installed by a properly
trained and qualified electrician. All power and control wiring must comply with all applicable
national, state and local codes. One person should never work alone, even if all power is
disconnected from the equipment. A second person should be standing-by to assist and to
summon help in case of an accident.
NOTICE
This unit complies with the limits for a Class A digital device, pursuant to Part 15 Subpart J of
FCC rules. These limits provide reasonable protection against harmful interference in a
commercial environment. This unit generates uses and radiates radio frequency energy and, if
not installed and used in accordance with this instruction manual, may cause harmful
interference to radio communications. Operation of this unit in a residential area may cause
harmful interference that the user must correct at his own expense.
NOTE: Materials sold hereunder cannot be used in the patient vicinity (e.g., use where UL, cUL or IEC
60601-1 is required). Medical applications such as invasive procedures and electrical life support
equipment are subject to additional terms and conditions.
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2 MECHANICAL INSTALLATION
2.1 Pre-installation Planning
This section describes the requirements that must be taken into account when planning the positioning
and cabling of the UPS and related equipment.
Installing personnel should observer these general procedures and practices. The particular conditions of
each site will determine the applicability of such procedures.
WARNING! Risk of electrical shock. Can cause injury or death. Special care must be taken when
working with the batteries associated with this equipment. When the batteries are connected
together, the battery-terminal voltage will exceed 400VDC and is potentially lethal.
NOTE: All equipment not referred to in this manual is shipped with details of its own mechanical and
electrical installation.
NOTICE
Risk of incorrect input power connection. Can cause equipment damage.
The standard Liebert® EXL S1™ Installer Guide UPS is suitable for connection to 60-Hz,
3-phase, 3-wire-plus-ground input power.
NOTE: Do not apply electrical power to the UPS equipment before the arrival of the commissioning
engineer. Connecting power before the commissioning engineer determines the system is properly
installed may void the warranty.
2.2 Preliminary Checks
Before installing the UPS, carry out the following preliminary checks:
•Visually examine the UPS equipment for transit damage, both internally and externally. Report
any damage to the shipper and to your Vertiv representative immediately.
•Verify that the correct equipment is being installed. The equipment supplied has an
identification tag on the interior doors stating the type, size, and main-calibration parameters
of the UPS.
•Verify that the UPS room satisfies the environmental conditions stipulated in the equipment
specification, paying particular attention to the ambient temperature and air-exchange
system.
2.3 Environmental Considerations
2.3.1 UPS Room
The UPS module is intended for indoor installation and should be located in a cool, dry, clean-air
environment with adequate ventilation to keep the ambient temperature within the specified operating
range (see Table 5.3 on page42).
The UPS is cooled with the aid of internal fans. Do not cover the ventilation openings. Cooling air must
enter and exit the cabinets freely to prevent overheating or malfunctioning.
2 Mechanical Installation 3

The UPS is equipped with air filters behind the front doors. A schedule for inspection of the air filters is
required. The period between inspections will depend upon environmental conditions.
When using bottom-entry, the conduit plate must be installed.
NOTE: The UPS must be installed on concrete or other non-combustible surface.
NOTICE
There is a potential risk to the operational integrity of an installed UPS system by the presence
of foreign material inside or in the vicinity of the UPS module.
This risk is especially high if conductive materials find their way inside the UPS module.
The risk potentially involves damage to the installed UPS equipment and subsequent
degradation or loss of power to the connected critical site load.
Vertiv applies the highest safety standards in equipment design to ensure that no live parts
are exposed to external contact, and also to ensure that the equipment is protected against
the introduction of foreign bodies during operation. However, it is not possible for Vertiv. to
ensure that foreign bodies will not be introduced during on-site installation, or when the UPS
doors and covers are open and the electrical terminals are exposed to allow power line
connections to be made by the electrical contractor/installer.
To prevent major disruption to site operations and risk to property and personnel, including
the possibility of a fatality, each site’s facility manager or construction manager must prevent
foreign bodies from being introduced into the UPS module.
All UPS modules are thoroughly inspected by Vertiv engineers before being placed into service
and testing on-site. However, the person responsible for the site must ensure that the UPS
module and the immediate surroundings are kept clean and free from any possible conductive
material such as metal foil, food wrappers, cable shields, washers and other hardware, scrap
metal and dust.
If the UPS system is shut-down after placement into service and testing are completed, the
UPS room must be kept clean to avoid the possibility (during restart) of the considerable
volume of air-flow produced by UPS operation to dislodge and/or drag any foreign bodies into
the equipment, which would result in system failure and possible supply interruption to the
critical site load, and several hours of downtime resulting from the damage typically associated
with such events.
If the UPS is left running/operational after placement into service and testing, the room must
be kept clean to prevent foreign bodies from entering the UPS module via its forced air-flow.
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2.3.2 Storing the UPS and Batteries for Delayed Installation
If the UPS system will not be installed immediately, store it indoors in a clean, dry, and cool location (see
Table 5.3 on page42). If the system includes a battery cabinet, the batteries’ requirements dictate the
storage conditions. Unpacked, install, and charge batteries as soon as possible after delivery.
NOTICE
Risk of failure to properly charge batteries. Can cause permanent damage to batteries and void
the warranty.
Batteries will discharge during storage. Batteries must be recharged as recommended by the
battery manufacturer. A notice of “Charge Before Date” is affixed to each cabinet that has
batteries inside. The “Charge Before Date” is calculated based on storing the batteries at 77°F
(25°C). Storage at a higher temperature will increase the rate of self-discharge, which requires
earlier recharge. Consult the battery manufacturer on how to determine when the batteries
need to be recharged.
2.3.3 Installation Altitude
The maximum operating altitude of the UPS, without derating, is 3300ft(1000m).
2.4 Positioning
The cabinet is structurally designed to permit lifting from the base with a forklift, pallet jack, or similar
equipment.
Access to the power terminals, auxiliary terminal blocks and power switches is from the front and top.
The doors and top low-voltage cover can be opened for access to the power connection bars, auxiliary
terminal blocks and power isolators. The front door can be opened 90 degrees for more flexibility in
installations.
2.4.1 Moving the Cabinets
Plan the travel route between the point of arrival and the unit’s position to make sure that all passages are
wide enough for the unit and that floors are capable of supporting its weight. For instance, check that
doorways, lifts, ramps, and so on, are adequate and that there are no impassable corners or changes in the
level of corridors that would prevent passage.
Ensure that the UPS weight is within the designated surface weight loading (kg/cm2) of any handling
equipment. For weight details, see Table 5.2 on page41.
Move the UPS with a forklift or similar equipment to ease the relocation and to reduce unit vibration. The
bottom structure of the UPS will support the unit only if the forks are completely beneath the unit. The
optional battery cabinets also should be moved with a forklift or similar equipment.
Ensure that any equipment used in moving the UPS cabinet has sufficient lifting capacity to transport
the unit. Care must be taken to protect the panels. Do not tilt the UPS or other system cabinet more than
15degrees.
Handling with straps is not authorized.
2 Mechanical Installation 5

WARNING! Risk of heavy unit falling over. Improper handling can cause equipment damage,
injury or death. Because the weight distribution in the cabinet is uneven, use extreme care while
handling and transporting. Take extreme care when handling UPS cabinets to avoid equipment
damage or injury to personnel. Locate center of gravity symbols and determine unit weight
before handling each cabinet. Test lift and balance the cabinets before transporting. Maintain
minimum tilt from vertical at all times. The UPS module weighs up to 4667 lb. (2117 kg).
2.4.2 Clearances
The UPS has no ventilation grilles at either side or at the rear. Leave a distance of 24in. (610mm) between
the top of the UPS and any overhead obstacles for service and adequate circulation of air from the unit.
Clearance around the front of the equipment should be sufficient to enable free passage of personnel
with the doors fully opened, about 50in. (127cm). In the rare instance of module replacement, 50in.
(127cm) of clearance is required for the Service team to perform module replacement. 50in. (127cm)
allows adequate clearance for both the module and the heavy-duty lift used by Service team to remove
and replace the modules. If 50in. (127cm) is not available, then the Service team will instead replace
components and subassemblies in the modules as part of their repair process.
2.4.3 Raised-Floor Installations
If the equipment will be installed on a raised floor, mount the UPS on a pedestal suitably designed to
accept the equipment-point loading. Refer to the base view to design this pedestal.
2.4.4 Floor Anchors—Optional
For seismic-resistant installations, special floor anchors must be used for the UPS and matching battery
cabinets; see 5on page39.
2.4.5 Kick Plate Installation—Standard
Kick plates must be installed. If the unit will be installed in a position that does not permit access to rear of
the UPS, install the kick plates before the unit is placed in its final position.
2.4.6 Special Considerations for 1+N Parallel Systems
Consider the grounding configuration of your system before finalizing module placement See Configuring
Ground Connections on page 29.
The cabling impedance must be closely matched to ensure proper load-sharing. Mismatched impedance
may cause an overload on one module in a 1+N system, triggering a shutdown and loss of power to the
connected load. Mismatched cable impedance is amplified when a 1+N system is operating on bypass
because the power on the bypass path is not controlled. We recommend matching the impedance in the
bypass path of paralleled systems as closely as possible to ensure good bypass current sharing.
The 1+N UPS Bypass Current Sharing Inductor option can be used to minimize the effects of cable
impedance mismatch.
The impedance mismatch can also be minimized by controlling the wiring length of each unit. The design
and the layout of the UPS system and associated panels and cabling should be examined closely to
ensure that cable lengths and impedance are closely matched.
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For EXL S1 systems, the total combined cable length of the bypass feeder cables and the module output
cables for each module must be within 5% from maximum to minimum. The combined cable length is the
sum of the length from the common source feeding all the modules to the common output switchboard.
If the cabling impedance need to be greater than 5% or the total, planned system load exceeds more than
85%per module, contact your Vertiv representative to calculate whether the system will result in an
overload condition when operating on bypass.
When bringing a 1+N system on line for the first time or after removing one unit, we recommend checking
the bypass current mismatch. To check the bypass current mismatch:
1. Place a load on the bypass of each UPS module.
2. View the output current of each unit.
The accuracy of the currents displayed on the UPS module is sufficient for this check. If the mismatch is
greater than 5%, the bypass impedance must be balanced or the load must be limited to less than the
maximum rating.
The output switchboard for any 1+N system must be configured with one Module Output Circuit Breaker
(MOB) for each UPS module that is to be connected to that switchboard. The breaker must be equipped
with auxiliary contacts that will be monitored by the UPS in order for interlocks to function properly and
for the HMI to indicate the bypassed status of the module.
We recommend selecting breakers that work with current levels that may occur when switching a module
onto the active bus. Breakers with adjustable instantaneous settings should be adequate to achieve this.
For further information about matching cable impedance or refer to Performance Improvements with
Sharing Inductors in Distributed Static Switch UPS Systems on the Liebert® EXLS1™ product page at
www.VertivCo.com, or contact Vertiv support, http://www.VertivCo.com/en-us/support/.
2.4.7 Unpacking and Unloading the Cabinet from the Pallet
Take utmost care when removing the packaging to prevent damage to the equipment. Check all
packaging materials to ensure that no important items are discarded.
Once the packaging is removed, take the UPS off the pallet by removing the retaining screws. Refer to
page 5 of the appropriate illustration included in Technical Illustrations on page 53. 2.5 on the next page,
lists the relevant drawings by number.
Once the retaining screws are removed, lift the unit off using a fork lift.
Do not remove the retaining brackets from UPS because they are used to fasten the UPS to the floor,
except where seismic compliance is required and the optional seismic anchoring kits are used.
2 Mechanical Installation 7

2.5 System Configuration
A UPS system is comprised of a number of equipment cabinets, depending on the individual system
design requirements. In general, all the cabinets in an installation are the same height.
NOTE: If you are bolting cabinets together, remove the side panels before beginning installation.
•UPS with connected battery cabinets—Shown in Figure 2.1 on the facing page. The battery
cabinets are connected to the UPSand internally wired. The battery cabinets must be installed
on the right of the UPS in a connected system. On 600-kVA and lower models, the battery-
wiring cabinet is a separate cabinet installed on the right side of the UPS between the UPS and
battery cabinets.
•Stand-alone, interconnected battery cabinets—Shown in Figure 2.2 on page10, with the
battery-junction cabinet on one end. The battery cabinets are interconnected with the
battery-wiring cabinet, but are not connected to the right side of the UPS. In this configuration,
the battery-junction cabinet may be on either end or between the battery cabinets.
•Stand-alone battery system—The battery-cabinet system stands alone. In this configuration,
there is no junction cabinet, and the battery cabinets are not connected to the UPS. Battery
power cables are routed directly to the DCbusbars in the UPS I/O cabinet.
NOTE: Make sure that you complete all of the connections detailed in the “Interconnection Details”
drawing before making any power-cabling connections. The interconnects are very hard to access
after the power wiring is complete. See Technical Illustrations on page 53, for the appropriate drawing
for your system
The detailed arrangement and cabinet dimensions for your UPS system is described in the installation
drawings. Refer to the appropriate illustrations for your unit included in Technical Illustrations on page 53.
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Figure 2.1 Connected and Internally-wired UPS system
Item Description
1 UPS
2 Battery cabinets
2 Mechanical Installation 9

Figure 2.2 Stand-alone, Interconnected Battery Cabinets
Item Description
1 Battery cabinet
2 Junction cabinet
2.6 Power-cable Busbars
Cables can enter the UPS cabinet from bottom or top into the input/output (I/O) section of the unit.
Various battery-cabinet arrangements are illustrated in 2.5 on page8, to 2.5 on page8.
The detailed cabling and connection for your UPS system is described in the installation drawings. In
addition to the following instructions, refer to the appropriate illustrations for your unit included in
Technical Illustrations on page 53. 2.5 on page8, lists the drawings by number, UPS model, and options.
Input power, from utility power or from a DC system, connects to the UPS through an input/output
cabinet. When Liebert® battery cabinets are attached to the UPS, Vertiv supplies the busbars and cables
for the power connections.
•A UPS with static bypass only utilizes Input/Output Cabinet1.
• A UPS with back-feed disconnect, common mode choke, bypass sharing
inductors or any combination of these options, utilizes Input/Output Cabinet2 or
Input/Output Cabinet3.
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The battery cabinets connect to the input/output cabinet with busbars.
•UPS models with static bypass only employ busbars that enter below the cabinet roof line.
Those busbars are enclosed by the battery cabinet and the input/output cabinet.
•UPS models with back-feed disconnect, common mode choke, bypass sharing inductors or with
any combination of these options, employ busbars that extend through openings in the tops of
the adjacent battery cabinet and input/output cabinet. These busbars require a protective,
factory-supplied shroud that is attached to the input/output cabinet and the adjacent
attached battery cabinet. The protective, factory-supplied shroud is shown in Figure 2.4 on
page13.
To connect power to the UPS from the attached battery system:
1. Remove the panels from the right side of the input/output cabinet and from the left side of the
adjacent battery cabinet.
2. Position the cabinets and bolt them together.
3. Remove two interconnect straps and the M10 mounting hardware from the battery cabinet.
Keep straps and hardware for possible future use.
4. Use the hardware supplied in the cable kit to connect the output busbars from the battery
cabinet to the input busbars in the input/output cabinet.
NOTE: Busbar connections vary depending on the system rating. For details, refer to the submittal
drawings that shipped with the battery system and to Figure 2.3 on the next page and Figure 2.4 on
page13.)
5. Torque the busbar and cable connectors to 480 in-lb. (54Nm).
6. On systems connecting to Input/Output Cabinet2or3, install the protective shroud using the
4 factory-supplied M6 x 12 mm self-tapping screws to attach the shroud and enclose the
busbars, see Figure 2.4 on page13.
2 Mechanical Installation 11

Figure 2.3 Battery-cabinet busbar connections to input/outputcabinet1
Item Description
1 1000-kVA to 1200-kVA models
2 500-kVA to 800-kVA models
3 Connect to negative battery bus in I/O cabinet
4 Connect to positive battery bus in I/O cabinet
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Figure 2.4 Battery-cabinet busbar connections to input/outputcabinet2or3 (1200-kVA model
shown)
Item Description
1 Input/Output cabinet
2 Busbar x 3
3 Busbar x 3
4 Battery cabinet
5 Busbar shroud
2 Mechanical Installation 13

2.7 Attaching Input/Output Cabinets
The UPS utilizes input/output cabinets for electrical connections.
AUPS with static bypass only utilizes Input/Output Cabinet 1.
A UPS with the optional back-feed disconnect, the optional common mode choke, the
optional bypass sharing inductors or with any combination of those options utilizes Input/Output
Cabinet 2 or 3.
The connection points and shipping splits for your UPS system are described in the installation drawings.
Refer to the appropriate illustrations for your unit included in Technical Illustrations on page 53.
The following table lists relevant drawings by number, UPS model, and options.
Drawing Number model/options
559322P1 Mechanical installation, 800 and 1200kVA UPS with Input/Output Cabinet 1
561763P1 Mechanical installation, 800 and 1200kVA UPS with Input/Output Cabinet 2 or 3
Table 2.1 Connection and Shipping-split Drawings
2.7.1 Moving Input/Output Cabinets into Position
An input/output cabinet must be moved toward the UPS cabinet from the end. Damage may occur if it is
moved straight back along the shipping split.
Before moving an input/output cabinet into position, three input fuses must be removed. For the location,
refer to the appropriate illustrations for your unit included in Technical Illustrations on page 53. Table 2.1
above, lists relevant drawings by number, UPS model, and options.
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3 UPS ELECTRICAL INSTALLATION
These guidelines are for qualified installers who must have knowledge of local wiring practices pertaining
to the equipment to be installed.
WARNING! Risk of electrical shock. Can cause injury or death. The UPS contains high DC as
well as AC voltages. Check for voltage with both AC and DC voltmeters before working within
the UPS. Only properly trained and qualified personnel wearing appropriate safety headgear,
gloves, shoes and glasses should be involved in installing the UPS or preparing the UPS for
installation.
3.1 External Protective Devices
For safety, it is necessary to install circuit breakers in the input AC supply and external battery system.
Given that every installation has its own characteristics, this section provides guidelines for qualified
installation personnel with knowledge of operating practices, regulatory standards and the equipment to
be installed.
External overcurrent protection must be provided. See 5on page39, for overload capacity.
3.2 Power Cables
The UPS requires both power and control cabling. All control cables, whether shielded or not, should be
run separately from the power cables in metal conduits or metal ducts that are electrically bonded to the
metalwork of the cabinets to which they are connected.
The cable design must comply with the voltages and currents in 5on page39, through 5on page39,
follow local wiring practices and take into consideration the environmental conditions (temperature and
physical support media), room temperature and conditions of installation of the cable and system’s
overload capacity (see Specifications on page 39)
WARNING! Risk of electrical shock. Can cause injury or death. Before cabling the UPS, ensure
that you are aware of the location and operation of the external isolators that connect the UPS
input/bypass supply to the power distribution panel. Check that these supplies are electrically
isolated, and post any necessary warning signs to prevent them from being connected to the
UPS or other system cabinets.
ADVERTISSEMENT : Risque de décharge électrique pouvant causer des blessures graves,
voire mortelles. Avant de procéder au câblage du système ASC, assurez-vous que vous êtes
au courant de l’emplacement et du fonctionnement des isolateurs externes qui raccordent
l’alimentation d’entrée ou de dérivation au panneau de distribution électrique. Vérifiez que
ces raccords sont isolés électriquement et installez tous les panneaux d’avertissement
nécessaires pour empêcher leur utilisation accidentelle.
3 UPS Electrical Installation 15

When sizing battery cables, a maximum volt drop of 2 VDC is permissible at the current ratings given in 5
on page39.
The following are guidelines only and are superseded by local regulations and codes of practice where
applicable:
•The grounding conductor should be sized according to the fault rating, cable lengths, type of
protection, etc. The grounding cable connecting the UPS to the main ground system must
follow the most direct route possible.
•Using smaller, paralleled cables for heavy currents can ease installation.
•AC and DC cables must be run in conduits according to local codes, national codes and
standard best practices. This will prevent creation of excess EMI fields.
3.3 Sizing the Input Breaker that Feeds the UPS
Nominal input current (considered continuous) is based on full-rated output load. Maximum current
includes nominal input current and maximum battery recharge current (considered noncontinuous).
Continuous and noncontinuous current are defined in the NEC.
Maximum input current is controlled by the current limit setting, which is adjustable. Values shown are for
maximum current limit. If a smaller input feed breaker is used, the input current limit can be adjusted; see
your Vertiv representative for more information. The input current limit should not be set less than 105%
of the current needed to support the inverter at full load for normal operation.
This results in sufficient power to recharge the battery in a reasonable time and to operate over the
published input voltage range.
3.3.1 Single or Dual Input Feeds
The UPS may be fed from single reference sources or dual asynchronous sources with optional common-
mode choke. If a single-input configuration will be used, the utility source must be cabled to the rectifier-
input busbars.
NOTE: Make sure that you complete all of the connections detailed in the “Interconnection Details”
drawing before making any power-cabling connections. The interconnects are very hard to access
after the power wiring is complete. See Technical Illustrations on page 53, for the appropriate drawing
for your system
The terminal details and connections for your UPS system are described in the installation drawings.
Refer to the appropriate illustrations for your unit included in Technical Illustrations on page 53.
3.3.2 Automatic Transfer Switches
If the UPS is fed from an automatic transfer switch, the UPS can transfer to and from an alternate out-of-
phase source in double-conversion mode without applying a break-before-make delay to the automatic
transfer switch operation.
3.4 Input Power Cable Connection
The rectifier input, bypass, output and battery power cables (all require lug-type terminations) are
connected to busbars in the I/O sections. The terminal details and connections for your UPS system are
described in the installation drawings. Refer to the appropriate illustrations for your unit included in
Technical Illustrations on page 53.
Vertiv | EXL S1™ Installer Guide
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