This manual contains important instructions that should be followed during installation of your
Series 600T UPS and batteries.
WARNING
!
EXERCISE EXTREME CARE WHEN HANDLING UPS CABINETS
TO AVOID EQUIPMENT DAMAGE OR INJURY TO PERSONNEL.
THE UPS MODULE WEIGHT RANGES FROM 4200 POUNDS
(1909 KG) TO 9170 POUNDS (4170 KG), INCLUDING
TRANSFORMER CABINET. THE BATTERY CABINETS WEIGH
BETWEEN 3000 POUNDS (1364 KG) AND 4900 POUNDS (2227 KG).
LOCATE CENTER OF GRAVITY SYMBOLS BEFORE HANDLING
EACH CABINET. TEST LIFT AND BALANCE THE CABINETS
BEFORE TRANSPORTING. MAINTAIN MINIMUM TILT FROM
VERTICAL AT ALL TIMES.
SLOTS AT THE BASE OF THE MODULES AND BATTERY
CABINETS ARE INTENDED FOR FORKLIFT USE. BASE SLOTS
WILL SUPPORT THE UNIT ONLY IF THE FORKS ARE
COMPLETELY BENEATH THE UNIT.
FOLLOW ALL BATTERY SAFETY PRECAUTIONS WHEN
INSTALLING, CHARGING, OR SE RVICING BATTERIES. IN
ADDITION TO THE HAZARD OF ELECTRIC SHOCK, GAS
PRODUCED BY BATTERIES CAN BE EXPLOSIVE AND
SULFURIC ACID CAN CAUSE SEVERE BURNS.
IN CASE OF FIRE INVOLVING ELECTRICAL EQUIPMENT,
ONLY CARBON DIOXIDE FIRE EXTINGUISHERS, OR THOSE
APPROVED FOR USE IN ELECTRICAL FIRE FIGHTING,
SHOULD BE USED.
EXTREME CAUTION IS REQUIRED WHEN PERFORMING
MAINTENANCE.
BE CONSTANTLY AWARE THAT THE UPS SYSTEM CONTAINS
HIGH DC AS WELL AS AC VOLTAGES.
CHECK FOR VOLTAGE WITH BOTH AC AND DC VOLTMETERS
PRIOR TO MAKING CONTACT.
1
WARNING
!
LOCATE CENTER OF GRAVITY SYMBOLS
AND DETERMINE UNIT WEIGHT
BEFORE HANDLING CABINET.
If you require assistance for any reason, call the toll-free Liebert Global Services number; 1-800543-2378. For LGS to assist you expediently, please have the following information available:
Part Number:
Serial Number:
kVA Rating:
Date Purchased:
Date Installed:
Location:
Input Voltage:
Output Voltage:
Battery Reserve Time:
Read this manual thoroughly, paying special attention to the sections that apply to you, before
working with the UPS. Retain this manual for use by installing personnel.
Under typical operation and with all UPS doors closed, only normal safety precautions are necessary. The area around the UPS system should be kept free from puddles of water, excess moisture, or debris.
Special safety precautions are required for procedures involving handling, installation, and maintenance of the UPS system or the battery. Observe all safety precautions in this manual before
handling or installing the UPS system. Observe all precautions in the Operation and Mainte-nance Manual, before as well as during perfo rmance of a ll main tena nce procedu res. Obse rve a ll
battery safety precautions before working on or near the battery.
This equipment contains several circuits that are energized with high volta ge. Only test
equipment designated 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 or
using tools. Even when the power is turned Off, dangerously high potentials may exist at the
capacitor banks and at the batteries.
ONLY qualified service personnel should perform maintenance on the UPS system.
When performing maintenance with any part of the equipment under power, service personnel
and test equipment should be standing on rubber mats. The service personnel should wear insulating shoes for isolation from direct contact with the floor (earth ground).
Unless all power is removed from the equipment, one person should never work alone. A second
person should be standing by to assist and summon help in case an accident should occur.
Three types of messages are use d th roughout t he manual to st res s import an t text . Careful ly rea d
the text below each Warning, Caution, and Note and use professional skills and prudent care
when performing the actions described by that text.
A Warning signals the presence of a possible serious, life-threatening condition. For example:
WARNING
!
LETHAL VOLTAGES MAY BE PRESENT WITHIN TH IS UNIT
EVEN WHEN IT IS APPARENTLY NOT OPERATING. OBSERVE
ALL CAUTIONS AND WARNINGS IN THIS MANUAL. FAILURE
TO DO SO COULD RESULT IN SERIOUS INJURY OR DEATH. DO
NOT WORK ON OR OPERATE THIS EQUIPMENT UNLESS YOU
ARE FULLY QUALIFIED TO DO SO!! NEVER WORK ALONE.
A Caution indicates a condition that could seriously damage equipment and possibly injure personnel. For example:
CAUTION
!
Extreme care is necessary when removing shoring braces. Do not
strike the cabinet with hammers or other tools.
A Note emphasizes important text. If the note is not followed, equipment could be damaged or
may not operate properly. For example:
NOTE
If the UPS system has a blown fuse, the cause shoul d be determined before
you replace the fuse. Contact Liebert Global Services.
Safety Precautions 3
2.0INSTALLATION CONSIDERATIONS
Install your Series 600T UPS in accordance with the submittal drawing package and the following procedures.
A Liebert authori zed representative must perform the initial system check-out and start-up to
ensure proper system operation. Equipment warranties will be voided unless system start-up is
performed by a Liebert a uthoriz ed represent ative. C ontac t your loca l Liebert sales rep rese ntative
or Liebert Global Services at 1-800-543-2378 to arrange for system start-up.
CAUTION
!
Read this manual thoroughly before attempting to wire or
operate the unit. Improper installation is the most significant
cause of UPS start-up problems.
Do not install this equipment near gas or electric heaters. It is
preferable to install the UPS in a restricted location to prevent
access by unauthorized personnel.
1. Proper planning will speed unloading, location, and connection of the UPS. Refer to
Figure 7 through Figure 33 and Appendix A - Site Planning Data.
2. Refer to information later in this manual regarding the optional Battery Cabinet(s),
Maintenance Bypass Cabinet, and Transformer Cabinet. Observe all battery safety
precautions when working on or near the battery.
3. Use the shortest output distribution cable runs possible, consistent with logical equipment
arrangements and with allowances for future additions if planned.
4. Recommended ambient operating temperature is 25°C (77°F). Relative humidity must be less
than 95%, non-condensing. Note that room ventilation is necessary, but air conditioning may
not be required. Maximum ambient operating temperature is 40°C (104°F) without derating.
The batteries should not exceed 25°C (77°F). At elevations above 4,000 feet (1219 meters)
derating may be required (consult your Liebert sales representative).
5. Even though your Liebert UPS unit is 92.5 to 94% efficient, the heat output is substantial.
For more specific information, see Appendix A - Site Planning Data. Be sure
environmental conditioning systems can accommodate this BTU load, even during utility
outages.
6. The routing (inside the facility) to the installation site, as well as the floor at the final
equipment location, must be capable of supporting the cabinet weight and the weight of any
moving equipment. The modules weigh between 5,000 and 10,000 pounds. The battery
cabinets weigh between 3100 and 5100 pounds. Refer to Appendix A - Site Planning Data.
7. Plan the routing to ensure that the unit can move through all aisleways, doorways, and
around corners without risking damage. If the modules and batteries must be moved by
elevator, check the size of the door openings and the weight-carrying capacity of the elevator.
WARNING
!
LOCATE CENTER OF GRAVITY SYMBOLS
AND DETERMINE UNIT WEIGHT
BEFORE HANDLING CABINET.
4 Installation Considerations
3.0UNLOADINGAND HANDLING
The UPS module is shipped in one cabinet to allow easy handling at the site. Because the weight
distribution in the cabinet is uneven, use extreme care during handling and transport. Your
installation may also include Battery Cabinet(s), a Maintenance Bypass Cabinet, and an optional
transformer cabinet.
WARNING
!
EXERCISE EXTREME CARE WHEN HANDLING UPS CABINETS
TO AVOID EQUIPMENT DAMAGE OR INJURY TO PERSONNEL.
THE UPS MODULE WEIGHT RANGES FROM 2770 POUNDS TO
7500 POUNDS, NOT INCLUDING THE OPTIONAL
TRANSFORMER CABINET. BATTERY CABINETS WEIGH
BETWEEN 3100 AND 5100 POUNDS.
LOCATE CENTER OF GRAVITY SYMBOLS BEFORE HANDLING
CABINET. TEST LIFT AND BALANCE THE CABINET BEFORE
TRANSPORTING. MAINTAIN MINIMUM TILT FROM VERTICAL
AT ALL TIMES. SLOTS AT THE BASE OF THE UNIT ARE
INTENDED FOR FORKLIFT USE. BASE SLOTS WILL SUPPORT
THE UNIT ONLY IF THE FORKS ARE COMPLETELY BENEATH
THE UNIT.
To reduce the possibility of shipping damage, cabinets are shored with 2x4 bracing, secured with
screw-type nails. This shoring must be carefully removed prior to unloading.
CAUTION
!
Extreme care is necessary when removing shoring braces. Do not
strike cabinet with hammers or other tools.
Unloading and Handling 5
4.0INSPECTIONS
4.1External Inspections
1. While the UPS system is still on the truck, inspect the equipment and shipping container(s)
for any signs of damage or mishandling. Do not attempt to install the system if damage is
apparent. If any damage is noted, file a damage claim with the shipping agency within 24
hours and contact Liebert Global Services at 1-800-543-2378 to inform them of the damage
claim and the condition of the equip ment.
2. Locate the bag containing the keys for the front access door. The bag is attached to the
cabinet.
3. Compare the conten ts of t he shi pmen t wit h t he b il l of l a ding. Repo rt an y missi ng it ems to the
carrier and to Liebert Global Services immediately.
4. Check the nameplate on the cabinet to verify that the model number corresponds with the one
specified. Record the model number and serial number in the front of this installation
manual. A record of this information is necessary should servicing become required.
4.2Internal Inspections
1. Verify that all items have been received.
2. If spare parts were ordered, verify arrival.
3. Open doors and remove cabinet panels to check for shipping damage to internal components.
4. Check for loose connections or unsecured components in the cabinet(s).
5. Check for installation of circuit breaker line safety shields. There should be no exposed circuit
breaker terminals when the cabinet doors are opened.
6. Check for any unsafe condition that may be a potential safety hazard.
7. UPS modules are shipped with internally mounted shipping brackets. The shipping brackets
(painted orange) must be removed from the rear (remove rear panels).
6 Inspections
5.0EQUIPMENT LOCATION
1. Handle cabinet(s) in accordance with WARNINGS in 16.0 - Unloading and Handling. Use
a suitable material handling device to move cabinet to its final location. Exercise extreme care because of the uneven weight distribution. Carefully lower the cabinet to the floor.
2. Verify that the UPS system is installed in a clean, cool and dry location.
3. Installation and serviceability will be easier if adequate access is provided on all sides of the
equipment, but only front access is required.
a. Verify that there is adequate clearance to open cabinet doors. See drawings and local
codes (4 feet is recommended).
b. Verify that there is adequate area in front of circuit breakers to perform mai ntenance.
Check installation drawings for location of breakers. Check with local codes.
c.Verify that there is adequate clearance above all cabinets to allow exhaust air to flow
without restriction (2 feet minimum, unobstructed).
Equipment Location 7
6.0BATTERY INSTALLATION
6.1Battery Safety Precautions
Servicing of batteries should be performed or supervised by personnel knowledgeable of batteries
and the required precautions. Keep unauthorized personnel away from batteries.
When replacing batteries, use the same number and type of batteries.
CAUTION
!
Lead-acid batteries contain hazardous materials. Batteries must
be handled, transported, and recycled or discarded in accordance
with federal, state, and local regulations. Because lead is a toxic
substance, lead-acid batteries should be recycled rather than
discarded.
Do not open or mutilate the battery or batteries. Released
electrolyte is harmful to the skin and eyes. It may be toxic. Do not
dispose of battery or batteries in a fire. The battery may explode.
A battery can present a risk of electrical shock and high short
circuit current. The following precautions should be observed
when working on batteries:
1. Remove watches, rings, or other metal objects.
2. Use tools with insulated handles.
3. Wear rubber gloves and boots.
4. Do not lay tools or metal parts on top of batteries.
5. Disconnect charging source prior to connecting or
disconnecting battery terminals.
6. Determine if battery is inadvertently grounded. If
inadvertently grounded, remove source of ground. Contact
with any part of a grounded battery can result in electrical
shock. The likelihood of such shock will be reduced if such
grounds are removed during installation and maintenance.
Lead-acid batteries can present a risk of fire because they
generate hydrogen gas. The following procedures should be
followed:
1. DO NOT SMOKE when near batteries.
2. DO NOT cause flame or spark in battery area.
3. Discharge static electricity from body before touching
batteries by first touching a grounded metal surface.
8 Battery Installation
Battery Safety Precautions in French Per CSA Requirements
Instructions Importantes Concernant La Sécurité
Conserver Ces Instructions
ADVERTISSEMENT
!
DES PIECES SOUS ALIMENTATION SERONT LAISSEES SANS
PROTECTION DURANT CES PROCEDURES D’ENTRETIEN. UN
PERSONNEL QUALIFIE EST REQUIS POUR EFFEC TUER CES
TRAVAUX.
LES FUSIBLES A C.C. DE LA BATTERIE D’ACCUMULATEURS
OPERENT EN TOUT TEMPS A LA TENS ION NOMINALE. LA
PRESENCE D’UN FUSIBLE A C.C. BRULE INDIQUE UN
PROBLEME SERIEUX. LE REMPLACEMENT DE CE FUSIBLE,
SANS AVOIR DETERMINE LES RA ISONS DE LA
DEFECTUOSITE, PEUT ENTRAINER DES BLESSURES OU DES
DOMMAGES SERIEUX A L’EQUIPEMENT. POUR ASSISTANCE,
APPELER LE DEPARTEMENT DE SERVICE A LA CLIENTELE
DE LIEBERT.
DANGER
!
Les accumulateurs plomb-acide contiennent de la matière
comportant un certain risque. Les accumulateurs doivent être
manipulés, transportés et recyclés ou éliminés en accord avec les
lois fédérales, pro vin ciales et locales. Parce que le plomb est une
substance toxique, les accumulateurs plomb-acide devraient être
recyclés plutôt qu’éliminés.
Il ne faut pas brûlé le ou les accumulateurs. L’accumulateur
pourrait alors explosé.
Il ne faut pas ouvrir ou endommager le ou les accumulateurs.
L’électrolyte qui pourrait s’en échapper est dommageable pour la
peau et les yeux.
Un accumulateur représente un risque de choc électrique et de
haut courant de court-circuit. Lorsque des accumulateurs sont
manipulés, les mesures préventives suivantes dev r aient être
observées:
1. Retirer toutes montre, bagues ou autres objets métalliques.
2. Utiliser des outils avec manchon isolé.
3. Porter des gants et des bottes de caoutchouc.
4. Ne pas déposer les outils ou les pièces métalliques sur le
dessus des accumulateurs.
5. Interrompre la source de charge avant de raccorder ou de
débrancher les bornes de la batterie d’accumulateurs.
6. Déterminer si l’accumulateur est mis à la terre par erreur. Si
oui, défaire cette mise à la terre. Tout contact avec un
accumulateur mis à la terre peut se traduire en un choc
électrique. La possibilitié de tels chocs sera réduit e si de telles
mises à la terre sont débranchées pour la durée de
l’installation ou de l’entretien.
Battery Installation 9
Les accumulateurs plomb-acide présentent un risque d’incendie
parce qu’ils génèrent des gaz à l’hydrogène. Les procédures
suivantes devront être respectées.
1. NE PAS FUMER lorsque près des accumulateurs.
2. NE PAS produire d e flammes ou d’étincelles près des
accumulateurs.
3. Décharger toute électricité statique présente sur votre corps
avant de toucher un accumulateur en touchant d’abord une
surface métallique mise à la terre.
DANGER
!
L’électrolyte est un acide sulfurique dilué qui est dangereux au
contact de la peau et des yeux. Ce produit est corrosif et aussi
conducteur electrique. Les procédures suivantes devront être
observées:
1. Porter toujours des vêtements protecteurs ainsi que des
lunettes de protection pour les yeux.
2. Si l’électrolyte entre en contact avec la peau, nettoyer
immédiatement en rinçant avec de l’eau.
3. Si l’électrolyte entre en contact avec les yeux, arroser
immédiatement et généreusement avec de l’eau. Demander
pour de l’aide médicale.
4. Lorsque l’électrolyte est renversée, la surface affectée devrait
être nettoyée en utilisant un agent neutralisant adéquat. Une
pratique courante est d’utiliser un mélange
d’approximativement une livre (500 grammes) de bicarbonate
de soude dans approximativement un gallon (4 litres) d’eau. Le
mélange de bicarbonate de soude devra être ajouté jusqu’à ce
qu’il n’y ait plus apparence de réaction (mousse). Le liquide
résiduel devra être nettoyé à l’eau et la surface concernée
devra être asséchée.
10 Battery Installation
6.2Battery Cabinets
Two sizes of optional battery cabinets are available. Refer to Figure 11 through Figure 13. The
battery cabinet cells range from 90 to 150 Ampere-hours. The same model battery cabinet may be
paralleled in multiple cabinet strings for additional capacity. Battery capacity (in minutes) at
your installation will depend on cabinet model, number of cabinets, and amount of critical load on
the UPS.
1. Handling. The Battery Cabinet weighs between 3100 and 5100 pounds. Forklift slots are
provided for easy handling.
2. Cabinet Inspection. Remove all panels and visually inspect the batteries, bus connections,
and cabinet for any damage. Exercise caution; voltage is present within the Battery Cabinet even before installation. If there are signs of dama ge, do not procee d. Call Lieber t
Global Services at 1-800-542-2378.
3. Battery Storage. The batteries used in the Battery Cabinet have an excellent charge
retaining characteristic. The batteries can be stored for up to six months without any
appreciable deterioration. Self-discharge rate of the batteries is approximately 3% per month
when the batteries are stored in temperatures of 15°C to 25°C (59°F to 77°F). If the Battery
Cabinet must be stored for longer than six months, contact Liebert Global Services for
recommended action.
4. Installation. The Battery Cabinet(s) can be located conveniently next to the UPS module.
The front-access-only-design eliminates side and rear service clearance requirements.
• Environment. Locate the Battery Cabinet in a clean, dry environment. Recommended
temperature range for optimum performance and lifetime is 20°C (68°F) to 25°C (77°F).
• Service Clearance. Allow front access to the Battery Cabinet at all times for mainte-
nance and servicing. Electrical codes require that the Battery Cabinet be installed with no
less than 3 feet (1 met er) of clea ranc e a t the fro nt of t he cabi net wh en op erating . Side a nd
rear panels do not require service clearance.
• Side Panels. Remove protective side panels to connect battery cabinets together. Panels
are retained at the bottom with three screws.
• Shield Plate. The shield plate in each Battery Cabinet should be on the side toward the
UPS system. Move the shield if required by your Battery Cabinet location.
• Cables. Cables may be run between the cabinets through cutouts in the top of the cabi-
nets, eliminating the need for external conduit runs. Route cables before moving cab-inets into final position for bolting toget her. Remove top panels fo r access. N o top o r
bottom entry cables are required, except for remotely located cabinets which require conduits. Refer to Figure 11 through Figure 13.
NOTE
The 300-450 kVA UPS module is approximately 2 inches deeper than the
Battery Cabinet and is not designed to bolt directly to it.
6.3Non-Standard Batteries
When batteries other than a matching Battery Cabinet are used (not recommended), a remote
battery disconnect switch with overcurrent protection is required per the National Electrical
Code. Refer to Figure 39 and Figure 40. Contact your Liebert sales representative.
1. Install battery racks/cabinets and batteries per manufacturer’s installation and maintenance
instructions.
2. Verify battery area has adequate ventilation and battery operating temperature complies
with manufacturer’s specification.
If you have any questions concerning batteries, battery racks, or accessories, contact Liebert Global Services at 1-800-543-2378.
Battery Installation 11
7.0CONFIGURING YOUR GROUNDAND NEUTRAL CONNECTIONS
Improper grounding is the largest single cause of UPS installation and start-up problems. This is
not an easy subject, since grounding techniques vary significantly from site to site, depending on
several factors. The questions you should ask are:
• What is the configuration of the input power source? Most of the recommended schemes for
UPS grounding require grounded-wye service. The UPS system requires a bypass neutral for
sensing and monitoring the quality of the bypass input. If the building service is ungrounded
delta or corner-grounded delta, contact your Liebert representative to ensure your system
• What is the configuration of the UPS equipment? A Power-Tie system has different needs
than a standalone UPS module.
• What is the connected load? Does the critical load consist of one or more Power Distribution
Units (PDUs)? Do the PDUs have isolation transformers?
The following sections discus s recommended grounding procedures for various system configurations.
NOTE
Some UPS modules are equipped with input isolation transformers.
However, these transformers have no effect upon any system grounding
considerations. These modules will be grounded exactly as shown in the
following examples.
12 Configuring Your Ground and Neutral Connections
7.1Preferred Grounding Configuration, 480 or 600 VAC Input and Output, Isolated
Power Distribution Units, Wye-Connected Service
Figure 1Preferred Grounding Configuration, 480 or 600 VAC input and output
GROUNDING
ELECTRODE
PER NEC 250-24
One of the most-common configura tions of the Series 6 00T UPS is the Single Module Syst em with
480 VAC input, 480 VAC output, and a connected load consisting of multiple Power Distribution
Units (PDUs) with isolation transformers in the PDUs to produce 208 VAC. For Canadian customers, the UPS modules usually have 600 VAC input and output. The same principles apply if
the connected load is an isolation transformer feeding various loads. Figure 1 above shows a typical installation.
Notice that the UPS module main input and bypass input are connected to a grounded-wye service. In this configuration, the UPS module is not considered a separately derived source. The
UPS module output neutral is solidly connected to the building service neutral, which is bonded to
the grounding conductor at the service entrance equipment
The isolation transforme rs in the PDUs a re conside red a separatel y derived source . Therefo re the
PDU neutral should be bonded to the PDU grounding conductor and connected to a local grounding electrode in compliance with NEC 250-26.
Advantages of this configuration include:
• A measure of common-mode noise attenuation, since the isolation (common-mode rejection)
occurs as close to the load as practical (i.e. at the PDU).
• The UP S module can be located remotely from t he PDU without compromising co mmon-mode
noise performance.
• By using UPS modules with 480 VAC input and output and creating 208 VAC at the PDU,
smaller and less costly power feeders can be used and less voltage drop (as a percent of nominal) occurs.
NOTE
Some UPS modules are equipped with input isolation transformers.
However, these transformers have no effect upon any system grounding
considerations. These modules will be grounded exactly as shown in these
pages.
Configuring Your Ground and Neutral Connections 13
7.2Alternative Grounding Configuration, 480 or 600 VAC Input and Output,
Isolated Power Distribution Units, Wye-Connected Service
Figure 2Alternative Grounding Configuration, 480 or 600 VAC input and output
This configuration is similar to that shown in Section 7.1, except that the service entrance neutral
is not brought into the UPS module. In this configuration, the UPS output transformer is considered a separately derived source. T he UPS modul e neutra l is bonded t o th e UPS ground , which i s
connected to a local grounding electrode in accordance with NEC 250-26.
Please note that this configuration represents a price/performance trade-off. Whenever the UPS
module transfers to or from bypass, two AC sources (input and bypass) are briefly connected
together and circulating current must flow. In the previous configuration, the current flows
through the neutral conductor. In this configuration, the current flows through the ground path,
possibly tripping ground fault interruptors (GFIs) and distorting the bypass waveform reference.
Proper adjustment of ground fault interrupters is necessary to avoid unwanted tripping.
This configuration is reserved for those applications which meet all the following criteria:
• The facility has Wye-connected service
• The module rectifier input and bypass input are fed from the same source
• The connected load is strictly 3-wire (such as one or more PDUs ) and does not require a neutral from the UPS
• Special precautions are taken to prevent tripping the ground fault interruptors. The time
delay should be set to at least 30 cycles to prevent tripping when the UPS performs a transfer
or retransfer operation.
CAUTION
!
Failure to properly set the ground fault interruptors could cause
loss of power to the critical load.
14 Configuring Your Ground and Neutral Connections
7.3Grounding Configuration, 480 or 600 VAC Input and Output, Delta Source or
Impedance-Grounded Wye
Figure 3Preferred Grounding Configuration with Ungrounded Delta Source Input (top) and Corner-
Grounded Delta (bottom)
GROUNDING
ELECTRODE
PER NEC 250-24
GROUNDING
ELECTRODE
PER NEC 250-24
LOCAL
GROUNDING
ELECTRODE
PER NEC 250-30
LOCAL
GROUNDING
ELECTRODE
PER NEC 250-30
LOCAL
GROUNDING
ELECTRODE
PER NEC 250-30
As previously mentioned, Series 600T UPS modules require a bypass input neutral for sensing
and monitoring. With a wye-connected input source, the installer should connect the building service neutral to the module output neutral to achieve this. When the building service is delta-connected, however, the installer must take special steps to ensure reliable UPS functioning.
If building service is ungrounded delta (and there is no intent to operate with one corner of the
delta grounded, either on purpose or accidentally), the UPS requires the Series 600T Artificial
Neutral Kit for proper operation. This kit uses a resistor network to create a reference point for
the bypass input. In this case, the UPS output neutral must be bonded to the UPS ground. See
Figure 5 above.
If the building service is corner-grounded delta or an impedance-grounded wye, the UPS requires
the Series 600T Isolated Neutral Kit. This kit uses control isolation transformers to create a reference point. For this application, the UPS output neutral must not be bonded to the UPS ground.
Configuring Your Ground and Neutral Connections 15
7.4Preferred Grounding Configuration, 480 or 600 VAC Input and Output, with
Power-Tie™ Switchgear
Figure 4Preferred Grounding Configuration, Power-Tie™ Systems
GROUNDING
ELECTRODE
PER NEC 250-24
GROUNDING
ELECTRODE
PER NEC 250-24
Single Module Systems can be used with Power-Tie switchgear to provide dual critical load busses. The Power-Tie switchgear permits transferring critical loads from one critical bus to the
other so that one UPS module and associated breakers can be de-energized for maintenance. Certain configurations of Power-Tie equipment also permit the operator to continuously parallel the
output of the UPS modules.
In tied systems, each UPS module must have its neutral solidly connected to its own building service neutral and to the Power-Tie switchgear neutral. See Figure 6 above.
NOTE
It is essential to run a neutral connection between the tie switchgear and
both UPS modules as shown in the illustration above.
16 Configuring Your Ground and Neutral Connections
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