USACE / NAVFAC / AFCESA / NASA UFGS-26 33 53.00 20 (April 2008)
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Preparing Activity: NAVFAC Superseding
UFGS-26 33 53.00 20 (January 2008)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 26 33 53.00 20
UNINTERRUPTIBLE POWER SUPPLY (UPS)
04/08
NOTE: This guide specification covers the requirements for static UPS to provide
continuous ac power to critical loads and/or to improve the quality of ac power
to critical loads. The covered range of UPS units is between 10kVA and 750kVA
3-phase systems only. Single phase systems are not addressed. This specification
covers UPS with electro-chemical batteries. Electro-mechanical (stored energy)
UPS are not addressed.
Comments and suggestions on this guide specification are welcome and should
be directed to the technical proponent of the specification. A listing of technical
proponents, including their organization designation and telephone number, is
on the Internet.
Recommended changes to a UFGS should be submitted as a Criteria Change Request (CCR).
Use of electronic communication is encouraged.
Brackets are used in the text to indicated designer choices or locations where
text must be supplied by the designer.
NOTE: For Air Force projects only, UPS specifications, criteria, and purchases
shall be approved by the Power Conditioning and Continuation Interfacing Equipment
(PCCIE) Group Manager at Ogden Air Logistics Center (OO-ALC/LGHC) http://www.hill.af.mil/lg2/WebLGH.htm
NOTE: This guide specification is intended to be used with individual UPS units
which contain a single module or multiple modules within the same assembly.
Parallel units are not specifically addressed and require additional components.
There are two types of parallel systems commonly available. One is a parallel
system that requires a system control panel, external static bypass switch to
control the individual units and additional output switchgear with maintenance
bypass to connect the output of all the units; the other is individual units
that have integrated controls and static bypass switches that communicate with
one another and only require the output switchgear with maintenance bypass to
connect the output of all the parallel units. The designer should be aware
of the differences and select the system that addresses the design requirements.
Parallel systems require additional paragraphs to address the additional components
(system control panel with static bypass switch, output switchgear, etc) and
overall system requirements.
NOTE: This guide specification will not be used in the preparation of project
documents for installation of Government-furnished (GFE) UPS systems. For UPS
and battery installation instructions for GFE projects refer to "UPS Manufacturer's
Installation Drawings" and "Battery Manufacturer's Rack Assembly and Battery
Installation Instructions" which must be obtained from the Contracting Officer.
All plans/specifications having uninterruptible power supply systems, which
were procured as Government-furnished/Contractor installed equipment, must be
reviewed and concurred by the Contracting Officer.
PART 1 GENERAL
1.1 REFERENCES
NOTE: This paragraph is used to list the publications cited in the text of
the guide specification. The publications are referred to in the text by basic
designation only and listed in this paragraph by organization, designation,
date, and title.
Use the Reference Wizard's Check Reference feature when you add a RID outside
of the Section's Reference Article to automatically place the reference in the
Reference Article. Also use the Reference Wizard's Check Reference feature
to update the issue dates.
References not used in the text will automatically be deleted from this section
of the project specification when you choose to reconcile references in the
publish print process.
The publications listed below form a part of this specification to the extent referenced. The publications are
referred to within the text by the basic designation only.
[ACOUSTICAL SOCIETY OF AMERICA (ASA)ASA S1.4(1983; Amendment 1985; R 2006) Specification for Sound Level Meters (ASA 47)][ASTM INTERNATIONAL (ASTM)ASTM B 173(2001a; R 2007e1) Standard Specification for Rope-Lay-Stranded Copper Conductors Having Concentric-Stranded Members, for Electrical ConductorsASTM D 709(2001; R 2007) Laminated Thermosetting Materials][INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)IEEE C2(2007; Errata 2007; INT 2008) National Electrical Safety CodeIEEE C57.110(1998; Errata 2002; R 2004) Recommended Practice for Establishing Transformer Capability When Supplying Nonsinusoidal Load CurrentsIEEE C62.41.1(2002) IEEE Guide on the Surges Environment in Low-Voltage (1000 V and Less) AC Power CircuitsIEEE C62.41.2(2002) IEEE Recommended Practice on Characterization of Surges in Low-Voltage (1000 V and Less) AC Power CircuitsIEEE Std 100(2000) The Authoritative Dictionary of IEEE Standards TermsIEEE Std 450(2002; Errata 2004; INT 2005) Recommended Practice for Maintenance, Testing, and Replacement of Vented Lead-Acid Batteries for Stationary Applications][INTERNATIONAL ELECTRICAL TESTING ASSOCIATION (NETA)NETA ATS(2003) Acceptance Testing Specifications][INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO)ISO 9001(2008) Quality Management Systems- Requirements][NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)NEMA 250(2003) Enclosures for Electrical Equipment (1000 Volts Maximum)NEMA PE 1(2003; R 2003) Uninterruptible Power Systems -- Specification and Performance Verification][NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)NFPA 70(2007; AMD 1 2008) National Electrical Code - 2008 Edition][UNDERWRITERS LABORATORIES (UL)UL 1449(2006) Surge Protective DevicesUL 1778(2005; Rev thru Jul 2006) Uninterruptible Power Systems]1.2 RELATED REQUIREMENTS
NOTE: Include Section 26 08 00 APPARATUS INSPECTION AND TESTING on all projects
involving medium voltage and specialized power distribution equipment.
Section 26 08 00 APPARATUS INSPECTION AND TESTING applies to this section, with the additions and modifications
specified herein.
1.3 DEFINITIONS
Unless otherwise specified or indicated, electrical and electronics terms used in these specifications, and on
the drawings, shall be as defined in IEEE Std 100.
1.4 SUBMITTALS
NOTE: Submittals must be limited to those necessary for adequate quality control.
The importance of an item in the project should be one of the primary factors
in determining if a submittal for the item should be required.
A "G" following a submittal item indicates that the submittal requires Government
approval. Some submittals are already marked with a "G". Only delete an existing
"G" if the submittal item is not complex and can be reviewed through the Contractor's
Quality Control system. Only add a "G" if the submittal is sufficiently important
or complex in context of the project.
For submittals requiring Government approval on Army projects, a code of up
to three characters within the submittal tags may be used following the "G"
designation to indicate the approving authority. Codes for Army projects using
the Resident Management System (RMS) are: "RE" for Resident Engineer approval,
"ED for Engineering approval, and "AE" for Architect-Engineer approval"AE" for
Architect-Engineer; "DO" for District Office (Engineering Division or other
organization in the District Office); "AO" for Area Office; "RO" for Resident
Office; and "PO" for Project Office. Codes following the "G" typically are
not used for Navy projects.
Submittal items not designated with a "G" are considered as being for information
only for Army projects and for Contractor Quality Control approval for Navy projects.
Government approval is required for submittals with a "G" designation; submittals not having a "G" designation
are [for Contractor Quality Control approval.][for information only. When used, a designation following the
"G" designation identifies the office that will review the submittal for the Government.] The following shall
be submitted in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:
SD-02 Shop Drawings
UPS Drawings[; G][; G, [_____]]
UPS Installation[; G][; G, [_____]]
SD-03 Product Data
UPS Module[; G][; G, [_____]]
Submittal shall include manufacturer's information for each component, device, and accessory
provided with the transformer.
Factory Testing
UPS System
NOTE: Delete submittal for spare parts on Navy projects.
[UPS Spare Parts[; G][; G, [_____]]]
SD-06 Test Reports
Work Plan[; G][; G, [_____]]
Factory Test Plan[; G][; G, [_____]]
Performance Test Plan[; G][; G, [_____]]
Factory Tests[; G][; G, [_____]]
Performance Tests Report[; G][; G, [_____]]
Factory Tests Report[; G][; G, [_____]]
SD-09 Manufacturer's Field Reports
Initial Inspection and Tests[; G][; G, [_____]]
Performance Tests[; G][; G, [_____]]
SD-10 Operation and Maintenance Data
UPS Operation and Maintenance, Data Package 5[; G][; G, [_____]]
Submit operation and maintenance data in accordance with Section 01 78 23 OPERATION AND MAINTENANCE
DATA and as specified herein.
SD-11 Closeout Submittals
Installation
1.5 PERFORMANCE REQUIREMENTS
1.5.1 Normal Operation
The UPS module rectifier/charger shall convert the incoming ac input power to dc power for the inverter and for
float charging the battery. The inverter shall supply ac power to the critical load continuously. Inverter output
shall be synchronized with the bypass ac power source, provided that the bypass ac power source is within the
specified voltage and frequency range.
1.5.2 Emergency Operation (Loss or deviation of AC Input Power)
Whenever the ac input power source deviates from the specified tolerances or fails completely, the inverter shall
draw its power from the battery system and shall supply AC power to the critical load without any interruption
or switching. The battery shall continue to supply power to the inverter for the specified protection time or
until return of ac input source. At the same time, an alarm shall sound to alert operating personnel and a trouble
signal shall be sent over the communication network, allowing startup of a secondary power source or orderly
shutdown of the critical load.
1.5.3 Return of AC Input Power Source
When stable ac input power source returns the rectifier/charger shall resume operation and shall simultaneously
supply the inverter with dc power and recharge the battery. This shall be an automatic function and shall cause
no disturbance to the critical load.
1.5.4 Failure of AC Input Power to Return
Should the ac input power fail to return before the battery voltage reaches the discharge limit, the UPS system
shall disconnect from the critical load to safeguard the battery.
1.5.5 Transfer to Bypass AC Power Source
When the UPS controller senses an overload or degradation of the inverter output, the bypass switch shall automatically
transfer the critical load from the inverter output to the bypass ac power source without an interruption of
power. If the bypass ac power source is outside of specified tolerance limits, the UPS and the critical load
shall shut down.
1.5.6 Retransfer to Inverter
The static bypass switch shall be capable of automatically retransferring the load back to the inverter output
after the inverter output has returned to normal conditions. Retransfer shall only occur if the two sources are
synchronized.
1.5.7 UPS Bypass Maintenance
Manual closure of the maintenance bypass switch shall transfer the critical load from the inverter output to
the bypass ac power source without disturbing the critical load bus. UPS module shall be capable of manual return
to normal operation after completion of maintenance.
1.5.8 Battery Maintenance
The battery protective device shall provide the means of disconnecting the battery from the rectifier/charger
and inverter for maintenance. The UPS module shall continue to function and meet the performance criteria specified
except for the battery back-up time function.
1.6 QUALITY ASSURANCE
The manufacturer shall have a documented quality assurance program including:
a. Inspections of incoming parts, modular assemblies and final product.
b. Final test procedure for the product including proof of performance specifications.
c. On-site test procedure shall include an inspection of controls and indicators after installation
of the equipment.
d. ISO 9001 quality certification.
1.6.1 UPS Drawings
Detail drawings consisting of a complete list of equipment and materials, manufacturer's descriptive and technical
literature, battery sizing calculations per IEEE Std 485, installation instructions, single-line diagrams, ladder-type
schematic diagrams, elevations, layout drawings, and details required to demonstrate that the system has been
coordinated and will function properly as a unit.
1.6.2 UPS Installation
Include wiring diagrams and installation details of equipment indicating proposed location, layout and arrangement,
control panels, accessories, piping, ductwork, and other items that must be shown to ensure a coordinated installation.
Wiring diagrams shall identify circuit terminals and indicate the internal wiring for each item of equipment
and the interconnection between each item of equipment. Drawings shall indicate adequate clearance for operation,
maintenance, and replacement of operating equipment devices. Submittals shall include the nameplate data, size,
and capacity. Submittals shall also include applicable federal, military, industry, and technical society publication
references.
1.6.3 Work Plan
Submit [6][_____] copies of schedules of dates for factory tests, installation, field tests, and operator training
for the UPS system. Furnish a list of instrumentation equipment for factory and field test reports.
1.6.4 Factory Test Plan
Submit [6][_____] copies of factory test plans and procedures at least [21][_____] calendar days prior to the
tests being conducted. Provide detailed description of test procedures, including test equipment and setups,
to be used to ensure the UPS meets the performance specification and explain the test methods to be used. As
a minimum, the test procedures shall include the test required under the paragraph entitled "Factory Testing."
1.6.5 Performance Test Plan
Submit [6][_____] copies of test plans and procedures at least [15][_____] calendar days prior to the start of
field tests. Provide detailed description and dates and times scheduled for performance of tests, and detailed
description of test procedures, including test equipment (list make and model and provide functional description
of the test instruments and accessories) and setups of the tests to be conducted to ensure the UPS meets the
performance specification. Explain the test methods to be used. As a minimum, the test procedures shall include
the tests required under the paragraph entitled "Performance Tests."
1.6.6 Factory Tests Report
Submit [6][_____] copies of factory test report within [45][_____] calendar days after completion of tests.
Receive approval of test prior to shipping unit. Factory test reports shall be signed by an official authorized
to certify on behalf of the UPS manufacturer of that the system meets specified requirements in accordance with
the requirements set forth in paragraph entitled "Factory Testing". Test reports in shall be in booklet form
tabulating factory tests and measurements performed, upon completion and testing of the installed system. Reports
shall state the Contractor's name and address, the name of the project and location, and list the specific requirements
which are being certified.
1.6.7 Performance Tests Report
Submit report of test results as specified by paragraph entitled "Performance Tests" within [15][_____] calendar
days after completion of tests. Field test reports shall be signed by an official authorized to certify on behalf
of the UPS manufacturer that the system meets specified requirements in accordance with the requirements set
forth in paragraph entitled "Performance Tests". Test reports in shall be in booklet form tabulating factory
tests and measurements performed, upon completion and testing of the installed system. Reports shall state the
Contractor's name and address, the name of the project and location, and list the specific requirements which
are being certified.
1.6.8 Regulatory Requirements
In each of the publications referred to herein, consider the advisory provisions to be mandatory, as though the
word, "shall" had been substituted for "should" wherever it appears. Interpret references in these publications
to the "authority having jurisdiction," or words of similar meaning, to mean the Contracting Officer. Equipment,
materials, installation, and workmanship shall be in accordance with the mandatory and advisory provisions of
NFPA 70 unless more stringent requirements are specified or indicated.
1.6.8.1 Reference Standard Compliance
Where equipment or materials are specified to conform to industry and technical society reference standards of
the organizations such as American National Standards Institute (ANSI), American Society for Testing and Materials
(ASTM), National Electrical Manufacturers Association (NEMA), Underwriters Laboratories (UL), and Association
of Edison Illuminating Companies (AEIC), submit proof of such compliance. The label or listing by the specified
organization will be acceptable evidence of compliance.
1.6.8.2 Independent Testing Organization Certificate
In lieu of the label or listing, submit a certificate from an independent testing organization, competent to
perform testing, and approved by the Contracting Officer. The certificate shall state that the item has been
tested in accordance with the specified organization's test methods and that the item complies with the specified
organization's reference standard.
1.6.9 Standard Products
Provide materials and equipment that are products of manufacturers regularly engaged in the production of such
products which are of equal material, design and workmanship. Products shall have been in satisfactory commercial
or industrial use for 2 years prior to bid opening. The 2-year period shall include applications of equipment
and materials under similar circumstances and of similar size. The product shall have been on sale on the commercial
market through advertisements, manufacturers' catalogs, or brochures during the 2-year period. Where two or
more items of the same class of equipment are required, these items shall be products of a single manufacturer;
however, the component parts of the item need not be the products of the same manufacturer unless stated in this
section. Equipment shall be supported by a service organization that is, in the opinion of the Contracting Officer,
reasonably convenient to the site.
1.6.9.1 Alternative Qualifications
Products having less than a 2-year field service record will be acceptable if a certified record of satisfactory
field operation for not less than 6000 hours, exclusive of the manufacturers' factory or laboratory tests, is
furnished.
1.6.9.2 Material and Equipment Manufacturing Date
Products manufactured more than 2 years prior to date of delivery to site shall not be used, unless specified
otherwise.
1.7 DELIVERY AND STORAGE
Equipment placed in storage shall be protected from humidity and temperature variations, moisture, water intrusion,
dirt, dust, or other contaminants. In harsh environments where temperatures exceed non-operational parameters
established within this specification, the equipment storage facility shall be environmentally controlled to
ensure temperature parameters are within equipment specification. Documentation of same shall be provided to
the Government when storage is implemented.
1.8 PROJECT/SITE CONDITIONS
NOTE: This paragraph with subparagraphs is used by the Army. Delete for other
projects.
1.8.1 Environmental Conditions
NOTE: Designer must show approximate elevation
above sea level for project location if it exceeds
1,000 meters 3,300 feet. UPS system including batteries must be derated if
50 degrees C 122 degrees F operating temperature is required.
The UPS and battery system shall be capable of withstanding any combination of the following external environmental
conditions without mechanical or electrical damage or degradation of operating characteristics.
a. Operating altitude: Sea level to 1,000 meters 3,300 ft. (Systems applied at higher altitudes
shall be derated in accordance with the manufacturer's instructions).
b. Non-operating altitude: Sea level to 11,000 meters 36,000 ft.
c. Operating ambient temperature range: 0 to 40 degrees C 32 to 104 degrees F. Range for batteries
is 10 to 30 degrees C 50 to 86 degrees F.
d. Non-operating and storage ambient temperature range: Minus 20 to plus 50 degrees C Minus
4 to plus 122 degrees F.
e. Operating relative humidity: 0 to 95 percent, without condensation.
1.8.2 Sound Pressure Levels
NOTE: UPS modules rated up to 125 kVA should have a dB rating of 65 dBA or
lower at 1 meter 39 inches. UPS modules rated above 125 kVA should have a dBA
rating of 75 dB or lower at 1.5 meters 5 feet.
Sound pressure levels produced by the UPS, when operating under full rated load, at a distance of[ 1.5 meters
5 feet][ 1 meter 39 inches][_____] in any direction from the perimeter of the unit, shall not exceed [75][65][_____]
dB as measured on the A scale of a Type 1 sound level meter at slow response conforming to ASA S1.4.
1.8.3 Verification of Dimensions
The Contractor shall become familiar with details of the work, verify dimensions in the field, and shall advise
the Contracting Officer of any discrepancy before performing the work.
1.9 SPECIAL TOOLS
Provide one set of special tools, calibration devices, and instruments required for operation, calibration, and
maintenance of the equipment.
1.10 OPERATION AND MAINTENANCE MANUALS
1.10.1 Additions to UPS Operation and Maintenance Manuals
In addition to requirements of Data Package 5, include the followings on the actual UPS system provided:
a. An outline drawing, front, top, and side views.
b. Prices for spare parts and supply list.
c. Routine and field acceptance test reports.
d. Date of Purchase.
e. Corrective maintenance procedures.
f. Test measurement levels with specific test points.
[1.10.2 Spare Parts
NOTE: Do not provide spare parts for Navy projects.
Furnish the following spare parts, of the same material and workmanship, meeting the same requirements, and interchangeable
with the corresponding original parts.
a. Fuses: Two of each type and rating.
b. Circuit boards: One circuit board for each critical circuit.
c. Air Filters: One set of filters.
]1.11 WARRANTY
The equipment items shall be supported by service organizations which are reasonably convenient to the equipment
installation in order to render satisfactory service to the equipment on a regular and emergency basis during
the warranty period of the contract.
PART 2 PRODUCTS
2.1 UPS SYSTEM DESCRIPTION
NOTE: Connect alternate power source to bypass/maintenance bypass for systems
requiring dual input.
The UPS system shall conform to UL 1778 and shall consist of UPS module, battery system, battery protective device,
static bypass transfer switch, controls and monitoring. Input ac power shall be connected to the normal source
ac input of the UPS module. [Alternate power source shall be connected to bypass/maintenance bypass. ]The battery
shall be connected to the dc input of the UPS module through the battery protective device. The ac output of
the UPS system shall be connected to the critical loads.
2.1.1 Semiconductor Fusing
Power semiconductors shall be fused with fast-acting fuses to prevent cascaded or sequential semiconductor failures.
Indicator lamp or display panel denoting blown fuse conditions shall be readily observable by the operator without
removing panels or opening cabinet doors.
2.1.2 Control Power
NOTE: Most manufacturers do not have input and output control power source
feature as standard. Use for systems requiring high reliability.
Provide dual control power supplies. [Control power shall be derived from two sources, input and output, with
automatic selective control. ] The control power circuit shall have suitable protection, appropriately marked
and located in the immediate vicinity of the input protective device.
2.1.3 EMI/RFI Protection
The components and the system shall be designed to minimize the emission of electromagnetic waves that may cause
interference with other equipment.
2.1.4 Internal Wiring
Wiring practices, materials, and coding shall be in accordance with the requirements of NFPA 70, OSHA, and other
applicable standards. Wire runs shall be protected in a manner which separates power and control wiring. Control
wiring shall be minimum No. 16 AWG extra-flexible stranded copper. Logic-circuit wiring may be smaller. Ribbon
cables shall be minimum No. 22 AWG. Control wiring shall have permanently attached wire numbers.
2.1.5 Internal Assembly
The printed circuit board (PCB) subassemblies shall be mounted in pull-out and/or swing-out trays where feasible.
Cable connections to the trays shall be sufficiently long to allow easy access to all components. Where not feasible
to mount PCB subassemblies in pull-out or swing-out trays, they shall be firmly mounted inside the enclosure.
Every PCB subassembly shall be monitored. Self-test and diagnostic circuitry shall be included in the logic
circuits such that a fault can be isolated down to the PCB subassembly level.
2.1.6 Cabinets
UPS system shall be installed in cabinets of heavy-duty structure meeting the NEMA PE 1 standards for floor mounting.
UPS module cabinet shall be structurally adequate for forklift handling or lifting. Removable lifting eyes shall
be provided on top of each cabinet. UPS module cabinet shall have hinged and lockable doors on the front only,
with assemblies and components accessible from the front. Doors shall be [key] lockable. Operating controls
shall be located outside the locked doors. Input, output, and battery cables shall be installed through the top
or bottom of the cabinet.
2.1.6.1 Cabinet Finish
Equipment cabinet shall be cleaned, primed and painted in the manufacturer's standard colors, in accordance with
accepted industry standards. Cabinets shall be labeled in accordance with NFPA 70 for arc flash hazard with
warning sign reading: "Warning-Potential Arc Flash Hazard. Appropriate PPE and Tools Required when working
on this equipment" or similar wording.
2.1.6.2 Live Parts (300 Volts and Above)
Live parts (300 volts and above) that are exposed when front access doors are open shall be adequately protected
or covered to minimize the chance of accidental contact.
2.1.6.3 Drawout Assemblies
NOTE: Drawout applies to large units for removing inverter modules, static
switches assemblies, etc. Delete for units smaller than 500 kVA.
Drawout assemblies weighing 23 kg 50 lbs or more shall be provided with a means of lifting, either an overhead
device or a hoisting device.
2.1.7 Safety
UPS shall be equipped with instruction plates including warnings and cautions, suitably located, and describing
any special or important procedures to be followed in operating and servicing the equipment. The control panel
display shall also provide warning messages prior to performing a critical function.
2.1.8 UPS System Load Profile
NOTE: Refer to UFC 3-520-01 for additional information.
The UPS system shall be compatible with the load characteristics defined in the LOAD PROFILE below and load configuration.
Compensation for UPS/load interaction problems resulting from nonlinear loads or transformer and motor inrush
shall be provided.
LOAD PROFILE
Type of load: [data processing equipment][main frame][chilled water pump][_____].
Size of load: [_____][kVA][kW], [_____]horsepower, [_____]voltage, [[_____]amperage].
Switching pattern: [unswitched][cycled daily][cycled hourly][operated by thermostat][building management
system control][_____].
Transient characteristics: inrush current magnitude of [_____] times steady state rms current for duration
of [___] cycle; range of power factor variation of [_____] to [_____] [lagging][leading]; voltage dip
of [_____]%.
Steady-state characteristics: [0.8 lagging][0.9 lagging][1.0][_____] power factor.
Special factors: [harmonic characteristics - Total Harmonic Distortion [___]%][high elevation][nonstandard
input and output voltages][_____].
2.2 UPS SYSTEM RATINGS
Unless stated otherwise, the parameters listed are under full output load at [0.8][0.9] power factor, with batteries
fully charged and floating on the dc bus and with nominal input voltage.
2.2.1 System Capacity
NOTE: Typical capacities in kVA are 10, 15, 20, 30, 40, 50, 80, 100, 125, 150,
225, 250, 300, 500 and 750.
[_____] kVA, [_____] kW.
2.2.2 Battery Capacity
NOTE: Typical battery discharge times are 5, 10, 12, 15, and 30 minutes. If
no emergency source is available, longer battery discharge time may be required.
Discharge time to end voltage: [15][_____] minutes, at 25 degrees C 77 degrees F. End voltage at full discharge
shall be 1.67 volts per cell. Battery shall be capable of delivering 150 percent of full rated UPS load at initial
start-up.
2.2.3 Static Switch
NOTE: The static switch or static disconnect is a solid-state disconnect device
used to apply or disconnect ac power. The interrupting capacity requirements
must be determined for each project distribution system. Typical interrupting
capacities are 30,000 AIC and 50,000 AIC. Interrupting capacities are normally
found on the single line diagram or in the short circuit calculations provided
with the drawings.
[_____] amperes symmetrical interrupting capacity.
2.2.4 Module Bus Bracing
Braced for [_____] amperes symmetrical interrupting capacity.
2.2.5 AC Input
NOTE: Total harmonic current distortion (THD) is
usually specified as follows: modules 15-224 kVA: 10 percent; modules above
225 kVA: 5 percent. If UPS
will be supplied from a generator, the generator
capacity must be at least twice the UPS capacity if
THD exceeds 5 percent. Some of the manufacturers can provide units with the
above THD w/o input filters while others require optional input filters to achieve
the desired THD. Delete transformer inrush paragraph if input isolation transformer
is not required. Use 50 Hz for units shipped or purchased in Europe. Before
specifying them, be certain units having 60 Hz input with 50 Hz output and units
having 50 Hz input with 60 Hz output are available in the size specified. Be
certain that units having foreign voltages are clearly specified since they
are not standard for U.S. manufactured products. For transformer sub-cycle
inrush, selecting a lower value like 6 or 4 in lieu of the range (4 to 8) is
better for coordination of UPS feeder protection but might add some cost and
extra components. If the range is selected than upstream breaker should have
instantaneous current adjustment.
a. Voltage [208][240][480][_____] volts line-to-line.
NOTE: Some of the smaller UPS units usually <100 kVA are designed for 3
phase, 4 wire configuration only.
b. Number of phases: 3-phase, 3 [4]-wire, plus ground.
c. Voltage Range: Plus 10 percent, minus 20 percent, without affecting battery float voltage or output
voltage.
d. Frequency: [50][60] Hz, plus or minus 5 percent.
e. Power walk-in: 20 percent to 100 percent over 10 to 20 seconds.
f. Total harmonic current distortion (THD) reflected into the primary line: [5][10] percent maximum.
[g. Transformer sub-cycle inrush: [4 to 8][ ] times full load rating.
]h. Input surge protection: per IEEE C62.41.1 and IEEE C62.41.2.
i. Input power factor: Lagging from 1-100 percent load.
2.2.6 AC Output
NOTE: If the output voltage is 120/208 V and the
same voltage is not available for the static bypass
and maintenance bypass, a transformer will be
required in the bypass distribution system.
a. Voltage [208][240][480][_____] volts line-to-line, [120][277][_____] volts line-to-neutral.
b. Number of phases: 3-phase, 4-wire, plus ground.
c. Voltage regulation:
(1) Balanced load: Plus or minus 1.0 percent.
(2) 50 percent load imbalance, phase-to-phase: Plus or minus 2 percent.
(3) No-load voltage modulation: Plus or minus 1 percent.
(4) Voltage drift: Plus or minus 1 percent over any 30 day interval (or length of test) at stated
ambient conditions.
d. Voltage adjustment: Plus or minus 5 percent manually.
e. Frequency: [50][60] Hz.
f. Frequency regulation: Plus or minus 0.1 percent.
g. Frequency drift: Plus or minus 0.1 percent over any 24 hour interval (or length of test) at stated
ambient conditions when on internal oscillator.
h. Harmonic content (RMS voltage): Voltage THD shall be a maximum of 2 percent with 100 percent linear
load and 5 percent with 100 percent nonlinear load and a crest factor of less than 3 to 1.
i. Load power factor operating range: 1.0 to 0.8 lagging.
j. Phase displacement:
(1) Balanced load: Plus or minus 1 degree of bypass input.
(2) 50 percent load imbalance phase-to-phase: Plus or minus 3
degrees of bypass input.
k. Wave-form deviation factor: 5 percent at no load.
l. Overload capability (at full voltage) (excluding battery):
(1) 125 percent load for 10 minutes.
(2) 150 percent load for 60 seconds.
(3) 300 percent load for one cycle after which it shall be current limited to 150 percent until
fault is cleared or UPS goes to bypass.
2.2.7 Transient Response
2.2.7.1 Voltage Transients
a. 100 percent load step: Plus or minus 5 percent.
b. Loss or return of ac input: Plus or minus 1 percent.
c. Automatic transfer of load from UPS to bypass: Plus or minus 4
percent.
d. Manual retransfer of load from bypass to UPS: Plus or minus 4
percent.
e. Response time: Recovery to 99 percent steady-state condition within 20 milliseconds after any of
the above transients.
2.2.7.2 Frequency
a. Transients: Plus or minus 0.6 Hz maximum.
b. Slew Rate: 1.0 Hz maximum per second.
2.2.8 Efficiency
NOTE: Minimum efficiencies at full load are as follows:
UPS capacity Module
10 kVA to 125 kVA 88 Percent
Above 125 kVA 90 Percent
Above 300 kVA 92 Percent
A higher efficiency UPS will save money on electricity bills on the long run
and will pay off to spend more money up front if the funds are available.
a. Minimum Efficiency: [90][__] percent at full load kW and [90] [__] percent at 50 percent load.
2.3 UPS MODULE
NOTE: Delete input isolation transformer if not required.
2.3.1 General Description
UPS module shall consist of a rectifier/charger unit and a 3-phase inverter unit with their associated transformers,
synchronizing equipment, protective devices, surge suppression, [input isolation transformer,] and accessories
as required for operation.
2.3.1.1 Interchangeability
The subassemblies in one UPS module shall be interchangeable with the corresponding modules within the same UPS,
and from one UPS system to another of identical systems.
2.3.2 Rectifier/Charger Unit
Rectifier/charger unit shall be solid state and shall provide regulated direct current to the dc bus, supplying
power to the inverter and charging the battery plant.
2.3.2.1 Input Protective Device
NOTE: Calculate/verify AIC on the single line diagram at input of the UPS.
Rectifier/charger unit shall be provided with an input protective device. The protective device shall be sized
to accept simultaneously the full-rated load and the battery recharge current. The protective device shall be
capable of shunt tripping and shall have [_____] amperes symmetrical interrupting rating. The protective device
shall have
provision for locking in the "off" position.
2.3.2.2 Surge Protection
A surge suppression device shall be installed at the UPS input to protect against lightning and switching surges.
Internal components shall be protected from surges that enter at each ac input connection including main input,
static bypass transfer switch, [and maintenance bypass/isolation switch]. Surge suppressors shall protect internal
components according to IEEE C62.41.1 and IEEE C62.41.2, Category B. Surge suppressors shall be UL 1449 approved
to fail in "safe" mode.
[2.3.2.3 Input Isolation Transformer
NOTE: Delete the input isolation transformer if it's not required. Isolation
transformers provide isolation of line induced EMI, common mode noise and dc
offsets. Some of the UPS manufacturers require a separate cabinet for the transformer.
A dry-type, isolated-winding power transformer shall be used for the rectifier unit. The transformer's hottest
spot winding temperature shall not exceed the temperature limit of the transformer insulation material when operating
at full load. The transformer insulation shall be Class H, 150 degrees C rise. Transformer connections shall
be accessible from the front. Transformer cabinet, if required, shall match the UPS cabinet and attach to it.
]2.3.2.4 Power Walk-In
Rectifier/charger unit shall be protected by a power walk-in feature such that when ac power is returned to the
ac input bus, the total initial power requirement will not exceed 20 percent of the rated full load current.
This demand shall increase gradually to 100 percent of the rated full load current plus the battery charging
current over the specified time interval.
2.3.2.5 Sizing
Rectifier/charger unit shall be sized for the following two simultaneous operating conditions:
a. Supplying the full rated load current to the inverter.
b. Recharging a fully-discharged battery to 95 percent of rated ampere-hour capacity within ten times
the discharge time after normal ac power is restored.
2.3.2.6 Battery Charging Current
NOTE: Delete second step current limiting if the UPS system will not be supplied
with ac power from an auxiliary generator system or if the generator has been
sized to accommodate the recharge current of the battery. Second step current
limit is usually found in larger units of 150kVA and above.
a. Primary current limiting: Battery-charging current shall be voltage regulated and current limited.
The battery-charging current limit shall be separately adjustable from 2 percent to 25 percent of the
maximum discharge current. After the battery is recharged, the rectifier/charger unit shall maintain
the battery at full float charge until the next operation under input power failure. Battery charger
shall be capable of providing equalizing charge to the battery.
[b. Second step current limiting: The rectifier/charger unit shall also have a second-step battery current
limit. This second-step current limit shall sense actual battery current and reduce the input power demand
for battery recharging to 50 percent (adjustable from 30 percent to 70 percent) of the normal rate without
affecting the system's ability to supply full-rated power to the connected load. The second-step current-limit
circuit shall be activated by a dry contact signal from the generator set controls and shall prevent
normal rate battery recharging until utility power is restored.
]2.3.2.7 DC Ripple
Rectifier/charger unit shall minimize ripple current and voltage supplied to the battery; the ripple current
into the battery shall not exceed 3 percent RMS of the inverter input rated current; the ripple voltage into
the battery shall not exceed 2 percent RMS of the float voltage.
2.3.2.8 DC Voltage Adjustment
Rectifier/charger unit shall have manual means for adjusting dc voltage for battery equalization, to provide
voltage within plus 10 percent of nominal float voltage.
2.3.2.9 Battery Isolation Protective Device
Module shall have a dc protective device to isolate the module from the battery system. The protective device
size and interrupting rating shall be as required by system capacity and shall incorporate a shunt trip as required
by circuit design. The protective device shall have provision for locking in the "off" position.
2.3.3 Inverter Unit
Inverter unit shall be a solid-state device deriving its power from the dc bus (rectifier or battery source)
and providing ac power within specified limits to the critical load. Inverter shall utilize microprocessor controlled
solid state Pulse Width Modulation (PWM) controlled IGBT power transistor technology to shape the ac output.
2.3.3.1 Output Overload
The inverter shall be able to sustain an overload as specified across its
output terminals. The inverter shall not shut off, but shall continue to
operate within rated parameters, with inverse-time overload shutdown
protection. If the overload condition persists beyond the rated parameters of the inverter, the inverter shall
current limit, load shall be transferred to the bypass source, and the inverter shall disconnect automatically
from the critical load bus.
If the bypass source is not available and the overload/fault condition continues, the inverter shall current
limit for a limited time as determined by the manufacturer and shall shut down to protect the internal components.
2.3.3.2 Output Frequency Control
The inverter shall normally operate in phase-lock and synchronism with the bypass source. When the bypass source
frequency deviates by more than ±0.5 Hz, the internal frequency oscillator shall automatically take control and
become the new frequency reference. Upon restoration of the bypass source within the required tolerance, the
inverter shall synchronize back with that source at a slew rate not exceeding the specified rate. The oscillator
shall be temperature compensated and shall be manually adjustable.
2.3.3.3 Output Protective Device
The output protective device shall be capable of shunt tripping or opening on an applied control signal and shall
have the proper frame size and trip rating to supply overload current as specified. External output protective
device shall have provision for locking in the "off" position. The inverter output protective device shall work
in conjunction with the bypass protective device for both manual and automatic load transfers to and from bypass
power.
[2.3.3.4 Output Transformer
NOTE: Delete the output transformer unless isolation is required or the design
output voltage is different then the normal UPS output voltage. Some of the
UPS manufacturers require a separate cabinet for the transformer.
The inverter output transformer shall be similar to the input transformer and shall be capable of handling up
to [K-13][_____] nonlinear loads as described in IEEE C57.110.
]2.3.4 External Protection
UPS module shall have built-in self-protection against undervoltage, overvoltage, overcurrent and surges introduced
on the ac input source and/or the bypass source. The UPS shall also have built-in self-protection against overvoltage
and voltage surges introduced at the output terminals by paralleled sources, load switching, or circuit breaker
operation in the critical load distribution system.
2.3.5 Internal Protection
UPS module shall be self-protected against overcurrent, sudden changes in output load and short circuits at the
output terminals. UPS module shall be provided with output reverse power detection which shall cause the module
to be disconnected from the critical load bus when output reverse power is present. UPS module shall have built-in
protection against permanent damage to itself and the connected load for predictable types of failure within
itself and the connected load. At the end of battery discharge limit, the module shall shut down without damage
to internal components.
2.4 STATIC BYPASS TRANSFER CIRCUIT
A static bypass transfer circuit shall be provided as an integral part of the UPS and shall consist of a static
switch, made up of two reverse-paralleled SCRs (silicon-controlled rectifiers) per phase conductor, and a bypass
protective device or bypass switch, made up of a contactor or motor operated circuit breaker. The bypass protective
device shall be in parallel with the static switch. The inverter output protective device shall disconnect and
isolate the inverter from the bypass transfer circuit.
The control logic shall contain an automatic transfer circuit that senses the status of the inverter logic signals
and alarm conditions and provides an uninterrupted transfer of the load to the bypass ac power source, without
exceeding the transient limits specified herein, when a malfunction occurs in the UPS or when an external overload
condition occurs. The power section of the static bypass transfer circuit shall be provided as a plug-in type
assembly to facilitate maintenance. The static bypass transfer circuit shall be used to connect the input bypass
ac power source to the critical load when required, and shall have the following features:
2.4.1 Uninterrupted Transfer
The static bypass transfer switch shall automatically cause the bypass ac power source to assume the critical
load without interruption when the bypass control logic senses one of the following conditions and the UPS inverter
output is synchronized to the bypass ac power source:
a. Inverter overload exceeds unit's rating.
b. Battery protection period is expired and bypass is available.
c. System failure.
d. Inverter output undervoltage or overvoltage.
2.4.2 Interrupted Transfer
If an overload occurs and the UPS inverter output is not synchronized to the bypass ac power source, the UPS
inverter output shall current-limit for 200 milliseconds minimum. The inverter shall then turn off and an interrupted
transfer to the bypass ac power source shall be made.
If the bypass ac power source is beyond the conditions stated below, an interrupted transfer shall be made upon
detection of a fault condition:
a. Bypass voltage greater than plus or minus 10 percent from the UPS rated output voltage.
b. Bypass frequency greater than plus or minus 0.5 Hz from the UPS rated output frequency.
c. Phase differential of ac bypass voltage to UPS output voltage greater than plus or minus 3 degrees.
2.4.3 Manual Transfer
It shall be possible to make a manually-initiated static transfer from the system status and control panel.
The transfer shall be make-before-break utilizing the bypass switch.
2.4.4 Automatic Uninterrupted Forward Transfer
The static bypass transfer switch shall automatically forward transfer, without interruption after the UPS inverter
is turned "on", or after an instantaneous overload-induced reverse transfer has occurred and the load current
has returned to less than the unit's 100 percent rating.
2.4.5 Forced Transfer
The control logic circuitry shall provide the means of making a forced or reverse transfer of the static bypass
transfer circuit on an interrupted basis. Minimum interruption shall be 200 milliseconds when the UPS inverter
is not synchronized to the bypass ac power source.
2.4.6 Overload Ratings
NOTE: Select 'one minute' for greater than 150kVA; select '30 seconds' for
10-150kVA.
The static bypass transfer switch shall withstand the following overload conditions:
a. 1000 percent of UPS output rating for one cycle.
b. 150 percent of UPS output rating for [one minute][30 seconds].
c. 125 percent of UPS output rating for 10 minutes.
2.4.7 Static Switch Disconnect
NOTE: Delete if the static switch is of the
draw-out type.
A static switch disconnect shall be incorporated to isolate the static bypass transfer switch assembly so it
can be removed for servicing. The switch shall be equipped with auxiliary contacts.
2.5 MAINTENANCE BYPASS SWITCH
2.5.1 General
NOTE: Multi-module UPS systems require a UPS maintenance bypass that should
be incorporated into the UPS output switchgear.
There are two methods of installing a maintenance bypass switch. One is a cabinet
that bolts to the UPS module and becomes part of the line-up or is integral
to the UPS module cabinet. The second is physically isolated from the UPS module
in a separate cabinet mounted on the wall or free-standing floor-mounted. Choose
the appropriate method based on project conditions and requirements.
A maintenance bypass switch shall be provided [as an integral part of the UPS and located within the UPS module
or in a matching cabinet adjacent to the UPS cabinet][in a wall-mounted enclosure][in a free-standing floor-mounted
enclosure]. The maintenance bypass switch shall provide the capability to continuously support the critical load
from the bypass AC power source while the UPS is isolated for maintenance. The maintenance bypass switch shall
be housed [in an isolated compartment inside the UPS cabinet][in a separate cabinet or enclosure] in such a way
that service personnel will not be exposed to electrically live parts while maintaining the equipment. Switch
shall contain a maintenance bypass protective device and a module isolation protective device.
2.5.2 Load Transfer
The maintenance bypass switch shall provide the capability of transferring the critical load from the UPS static
bypass transfer switch to maintenance bypass and then back to the UPS static bypass transfer switch with no interruption
to the critical load.
[2.5.3 Load Bank Protection Device
NOTE: Delete if the ability to load bank test the
UPS system is not required.
A load bank protective device shall be provided to allow the UPS system to be tested using a portable load bank.
The load bank protective device shall be connected on the line side of the maintenance bypass switch isolation
protective device.
][2.5.4 [Voltage Matching][Isolation Transformer]
NOTE: Delete if the input and output voltages are the same and an isolation
transformer is not required.
The maintenance bypass cabinet shall contain [a voltage matching transformer][an isolation transformer] as required
to match the output voltage requirements.
]2.6 MODULE CONTROL PANEL
The UPS module shall be provided with a control/indicator display panel. The display panel shall be on the front
of the UPS module. Controls, meters, alarms and indicators for operation of the UPS module shall be on this panel.
The display panel shall be menu driven for browsing all the screens.
2.6.1 Module Meters
2.6.1.1 Monitored Functions
The following functions shall be monitored and displayed:
a. Input voltage, phase-to-phase (all three phases).
b. Input current, all three phases.
c. Input frequency.
d. Battery voltage.
e. Battery current (charge/discharge).
f. Output voltage, phase-to-phase and phase-to-neutral (all three phases).
g. Output current, all three phases.
h. Output frequency.
i. Output kilowatts.
j. Elapsed time meter to indicate hours of operation, 6 digits.
k. Bypass voltage, phase-to-phase and phase-to-neutral (all three phases).
l. Output kilovars.
m. Output kilowatt hours, with 15-minute demand attachment.
n. Battery temperature.
o. Output Percentage load.
p. Remaining battery time.
2.6.1.2 Meter Construction
The display panel shall display alphanumeric parameters based on true RMS metering with 1 percent accuracy (minimum
4 significant digits).
2.6.2 Module Controls
Module shall have the following controls:
a. Lamp test/reset pushbutton.
b. Alarm test/reset pushbutton.
c. Module input protective device trip pushbutton, with guard.
d. Module output protective device trip pushbutton, with guard.
e. Battery protective device trip pushbutton, with guard.
f. Emergency off pushbutton, with guard.
g. DC voltage adjustment potentiometer, with locking guard.
h. Control power off switch.
i. UPS/bypass transfer selector switch.
j. Static bypass transfer switch enable/disable selector switch.
2.6.3 Module Alarm Indicators
NOTE: Delete 'input transformer overtemperature' if input transformer is not
provided.
Module shall have indicators for the following alarm items. Any one of these conditions shall turn on an audible
alarm and the appropriate summary indicator. Each new alarm shall register without affecting any previous alarm.
a. Input ac power source failure.
b. Input protective device open.
c. Input power out of tolerance.
d. Overload.
e. Overload shutdown.
f. DC overvoltage/shutdown.
g. DC ground fault.
h. Low battery.
i. Battery discharged.
j. Battery protective device open.
k. Blower fan failure.
[l. Input transformer overtemperature.
]m. Low battery shutdown.
n. UPS on battery.
o. Equipment overtemperature.
p. Fuse blown (with indication where).
q. Control power failure.
r. Charger off/problem.
s. Inverter fault/off.
t. Emergency power off.
u. External shutdown (remote EPO activated).
v. Critical load on static bypass.
w. Static bypass transfer switch disabled/failure.
x. Inverter output overvoltage.
y. Inverter output undervoltage.
z. Inverter output overfrequency.
aa. Inverter output underfrequency.
bb. Bypass source voltage outside limits.
cc. Bypass frequency out of range.
dd. Bypass source to inverter out of synchronization.
ee. Overtemperature shutdown.
ff. Hardware shutdown.
2.6.4 Module Emergency OFF Button
Pressing the emergency off button shall cause the module to be disconnected from the system, via its input protective
device, output protective device, and battery protective device. The button shall include a protective cover
to prevent unintentional activation.
[2.7 SELF-DIAGNOSTIC CIRCUITS
NOTE: Delete if self-diagnostic circuits are not
required. These circuits are normally required in high reliability applications
where it becomes critical to identify the faulty circuit card in the shortest
time possible. This option is not normally available in off the shelf UPS units.
The control logic shall include status indicators for trouble-shooting the control circuits. These indicators
shall be mounted on the circuit card edge or face such that they will be visible without repositioning the card,
and shall be labeled with the function name.
][2.8 REMOTE MONITORING PANEL
NOTE: Delete if a remote monitoring panel is not
required.
A remote monitoring panel shall be provided to monitor system status. The panel shall be designed for wall mounting
near the critical load.
2.8.1 Indicators
Minimum display shall include the following indicators:
a. Load on UPS.
b. Load on battery.
c. Load on bypass.
d. Low battery.
e. Summary alarm.
f. New alarm (to alert the operator that a second summary alarm
condition has occurred).
2.8.2 Audible Alarm
Any single indicator shall also turn on the audible alarm. An audible alarm test/reset button and lamp test/reset
button shall be included. This reset button shall not affect nor reset the alarm on the module.
]2.9 COMMUNICATIONS AND DATA ACQUISITION
NOTE: Delete the communication and data options that are not required. RS-485
port is not supported by some of the UPS manufacturers.
An [RS 232][RS 485] communications and data acquisition port shall be
provided. This port shall allow the system parameters, status, alarm indication and control panel functions specified
to be remotely monitored and controlled.
Additionally, a second communication port shall be provided for use with the following:
a. A set of [six][eight] Form C remote alarm contacts rated at 120V, 0.5A, shall be provided for remote
alarm monitoring.
b. Auto-dial modem communication shall be provided to communicate with a remote modem in case an alarm
function is active.
c. A SNMP (Simple Network Management Protocol) adapter shall be provided to communicate UPS monitoring
via a network or direct connection to a PC.
d. A standard Web Browser adapter shall be provided to remotely view and monitor UPS functions over
the Internet.
All the communication ports and contacts shall be capable of simultaneous communication.
[2.9.1 Emergency Control Contacts
NOTE: Include this paragraph only when the UPS will be installed in conjunction
with an emergency generator/alternate source.
Provide normally open contacts to signal when power is supplied to the UPS from emergency engine generators or
alternate source.
]2.10 TEMPERATURE CONTROL
2.10.1 General
Cabinet and enclosure ventilation shall be adequate to ensure that components are operated within their ratings.
Forced-air cooled rectifier, inverter, and control unit will be acceptable. The cooling fans shall continue operation
if UPS input power is lost. Redundancy shall be provided so that failure of one fan or associated circuit breaker
will not cause an overheat condition. Cooling air shall enter the lower front of the cabinets and exhaust at
the top. Blower power failure shall be indicated as a visual and audible alarm on the control panel. Air inlets
shall have replaceable filters that may be located on the inside of the cabinet doors and shall be easily accessible
for replacement.
2.10.2 Blower Power Source
NOTE: Select 'output side' for 10-225kVA; select 'input and output sides' for
over 225kVA.
Blower power source shall be internally derived from the [output side] [input and output sides] of UPS module,
with automatic transfer arrangement.
2.10.3 Temperature Sensors
Temperature sensors shall be provided to monitor the air temperature. Separate sensors shall monitor the temperature
of rectifier and inverter heat sinks. Separate sensors shall also monitor the transformer temperature. Critical
equipment over-temperature indication shall start a timer that shall shut down the UPS system if the temperature
does not return below the setpoint level recommended by the UPS manufacturer.
2.11 BATTERY SYSTEM
NOTE: Refer to UFC 3-520-01 and UFC 3-520-01 (DRAFT) for battery types and
selection information.
2.11.1 General
Battery system shall contain the battery cells, racks, battery disconnect, battery monitor and cabinet, if required.
A storage battery with sufficient ampere-hour rating to maintain UPS output at full capacity for the specified
duration shall be provided for each UPS module. The battery shall be of heavy-duty, industrial design suitable
for UPS service. The cells shall be provided with flame arrestor vents, intercell connectors and cables, cell-lifting
straps, cell-numbering sets, and terminal grease. Intercell connectors shall be sized to maintain terminal voltage
within voltage window limits when supplying full load under power failure conditions. Cell and connector hardware
shall be stainless steel of a type capable of resisting corrosion from the electrolyte used.
2.11.2 Battery Ratings
a. Type: [lead calcium][lead antimony][nickel cadmium].
b. Specific gravity when fully charged: [1.215][_____].
c. End voltage [1.67][_____] volts per cell.
d. Float voltage: [2.17 to 2.26][2.15 to 2.22] volts per cell.
e. Equalizing voltage: [2.33 to 2.38][_____] volts per cell.
2.11.3 Battery Construction
The battery shall be of the [valve-regulated, sealed, non-gassing, recombinant type][wet-cell type and shall
be supplied complete with thermometer and hydrometer holder].
[2.11.4 Battery Cabinet
NOTE: Delete if a battery cabinet is not required.
The battery pack assembly shall be furnished in a battery cabinet matching the UPS cabinet. The battery cabinet
shall be designed to allow for checking the torque on the connections in the battery system and to provide adequate
access for annual housekeeping chores. External wiring interface shall be through the bottom or top of the assembly.
A smoke and high temperature alarm shall annunciate detection of either smoke or high temperature within the
battery cabinet.
][2.11.5 Battery Rack
NOTE: Delete if a battery rack is not required. Three tier racks should be
used only where floor space is limited. They increase floor loading and make
maintenance more difficult.
The battery shall be provided with a suitable number of [two-tier][three-tier] racks to fit the room layout shown.
Battery rack shall be steel and shall be protected with electrolyte-resistant paint. Battery rack shall be shipped
unassembled and shall include hardware necessary for assembly. Each rack shall be complete with bus bars to accommodate
cables from UPS module. Bus bar connectors for battery-to-battery connections and high-flex multi-stranded copper
cable (ASTM B 173 stranding class H) with proper cable supports for connecting top row of batteries to bottom
row of batteries at rack ends shall be provided. End sections shall be cut to length to prevent wasting floor
space.
]2.11.6 Cell-Terminal Covers
Acid-resistant transparent cell-terminal covers not exceeding 1.83 meters 6 feet in length and with vent holes
drilled on top where needed shall be provided.
2.11.7 Battery Disconnect
Each battery pack assembly shall have a fused disconnect switch provided in a NEMA 1 enclosure, finished with
acid-resistant paint and located in line with the assembly. Switch shall be complete with line side and load
side bus bars for connection to battery cells. Switch shall be rated [_____] V dc, [_____] amperes, 3-pole with
interrupting rating as required by system capacity, and shall have an external operator that is lockable in the
"off" position.
[2.11.8 Seismic Requirements
NOTE: Do not use this paragraph for Navy projects.
When directed to meet seismic requirements for battery supports, Section 13
48 00 and 26 05 48.00 10 must be edited to suit the project and be included
in the contract documents. Edit the following paragraph and include it in the
project specification. When the Government designer is the Engineer of Record
and for Navy projects, provide seismic requirements on the drawings.
The battery support system shall [conform to [Section 13 48 00 SEISMIC
PROTECTION FOR MISCELLANEOUS EQUIPMENT] [and to] [26 05 48.00 10 SEISMIC PROTECTION FOR ELECTRICAL EQUIPMENT]][be
as indicated].
]2.11.9 Battery Monitor
A battery monitor shall be provided for each battery pack assembly. At a
minimum, this device shall monitor the following parameters:
a. Total system voltage.
b. Ambient room temperature.
c. Total battery discharge cycles with a duration of [30 seconds or less][greater than 30 seconds
but less than 5 minutes][greater than 5 minutes].
The monitor shall also record the total accumulated discharge minutes and
accumulated battery system discharge kW hours.
2.12 FACTORY TESTING
NOTE: The designer should carefully evaluate the UPS application and the user's
mission to determine
critical tests for the UPS that will ensure UPS/load compatibility. These tests
should be conducted at
the factory and the results validated prior to
shipment to the site. The required UPS/load
interaction can be achieved by requesting the
following tests plus any other tests the designer
deems necessary:
a. Tests to ensure that the UPS rated power factor
is verified;
b. Tests to ensure that the UPS system will operate
in total accord and support the rated load;
c. Tests to ensure that the UPS system can deal
with load anomalies (odd harmonics, etc.) associated with the user's equipment
load.
The UPS system shall be factory tested to meet the requirements specified using a test battery (not the battery
to be supplied with the system). UPS module shall be factory load tested as an independent assembly with 3-phase
ac input power and with battery power for a minimum of 8 hours, with meter readings taken every 30 minutes. Load
shall be balanced at rated kVA and rated power factor. Factory tests for the UPS module shall be run under full
load, and will be witnessed by the Government. Should a malfunction occur, the problem shall be corrected and
the test shall be repeated. As a
minimum, the factory tests shall include the parameters described in
paragraphs ac Input, ac Output, Transient Response and Efficiency. The tests shall encompass all aspects of operation,
such as module failure, static bypass operation, battery failure, input power failure and overload ratings. The
Contracting Officer shall be notified in writing at least 2 weeks before testing. Factory-test time shall not
be used for system debugging and/or checkout. Such work shall be done prior to notifying the Government that
the system is ready for testing. Factory tests shall be performed during normal business hours. The system shall
be interconnected and tested for an additional 8 hours to ensure proper wiring and performance.
2.12.1 Transient Tests
Transient tests shall be conducted using high-speed oscillograph type recorders to demonstrate the operation
of the components to the satisfaction of the Government. These tests shall include 50 percent to 100 percent
load changes, manual transfer, manual retransfer, low dc bus initiated transfer and low ac output bus transfer.
A recording instrument equipped with an event marker shall be used.
2.12.2 Efficiency Tests
Testing for efficiency shall be performed at zero output up to 100 percent of stated kVA output in 25 percent
steps, [0.8][0.9] power factor, with battery fully charged and floating on the dc bus, with nominal input voltage,
and with module connected to represent actual operating conditions.
2.13 CABLE LUGS AND TERMINATIONS
2.13.1 Cable Lugs
Provide appropriate compression type lugs on all ac and dc power connections to the UPS system and battery as
required. Aluminum or bare copper cable lugs are not suitable.
2.13.2 Terminations
Terminals shall be supplied for making power and control connections. Terminal blocks shall be provided for field
wiring terminals. Terminal blocks shall be heavy-duty, strap-screw type. Terminal blocks for field wiring shall
be located in one place in each module. Control wiring shall be extended to the terminal block location. No more
than two wires shall land on any terminal point. Where control wiring is attached to the same point as power
wiring, a separate terminal shall be provided. If bus duct is used, bus stubs shall be provided where bus duct
enters cabinets.
2.14 INSPECTION
Inspection before shipment is required. The manufacturer shall notify the Government at least 2 weeks before
shipping date so that an inspection can be made.
2.15 FIELD FABRICATED NAMEPLATES
ASTM D 709. Provide laminated plastic nameplates for each equipment enclosure, relay, switch, and device; as
specified or as indicated on the drawings. Each nameplate inscription shall identify the function and, when
applicable, the position. Nameplates shall be melamine plastic, 3 mm 0.125 inch thick, white with [black][_____]
center core. Surface shall be matte finish. Corners shall be square. Accurately align lettering and engrave
into the core. Minimum size of nameplates shall be 25 by 65 mm 1.0 by 2.5 inches. Lettering shall be a minimum
of 6.35 mm 0.25 inch high normal block style.
2.16 MANUFACTURER'S NAMEPLATES
Each item of equipment shall have a nameplate bearing the manufacturer's name, address, model number, and serial
number securely affixed in a conspicuous place; the nameplate of the distributing agent will not be acceptable.
2.17 FACTORY APPLIED FINISH
Electrical equipment shall have factory-applied painting systems which shall, as a minimum, meet the requirements
of NEMA 250 corrosion-resistance test.
PART 3 EXECUTION
3.1 INSTALLATION
Electrical installations shall conform to IEEE C2, NFPA 70, and to requirements specified herein. Provide new
equipment and materials unless indicated or specified otherwise.
3.1.1 Control Cable
NOTE: UPS sizes 200 KVA and above are shipped in
sections. Control wiring between module sections
will be connected by the UPS manufacturer's technical representative.
UPS control wiring shall be installed in individual separate rigid steel conduits, unless connections are made
between side by side matching cabinets of UPS. Tag control wires with numeric identification tags corresponding
to the terminal strip location to where the wires are connected. In addition to manufacturer's requirements,
provide four additional spare conductors between UPS module and remote alarm panel in same conduit. When routing
control cables inside UPS module, maintain a minimum 155 mm 6 inches separation from power cables.
3.1.2 Grounding Conductor
Provide an insulated equipment grounding conductor in feeder and branch circuits. Conductor shall be separate
from the electrical system neutral conductor. Ground battery racks and battery breaker cabinets with a separate
equipment grounding conductor to the UPS cabinet.
3.1.3 UPS Output Conductors
Isolate the UPS output conductors from the UPS cabinet to the critical load panels and from other conductors
by installing in separate conduit. Isolation shall prevent inductive coupling from other conductors.
[3.1.4 DC Power Conductors
NOTE: Include this paragraph only when shipping splits occur or when batteries
are remote from the UPS cabinet.
When installed in conduits, place dc power conductors from the UPS cabinet to the battery circuit breaker such
that each conduit contains an equal number of positive and negative conductors, for example, two positive and
two negative conductors in each conduit.
]3.1.5 Seismic Protection
NOTE: Do not use this paragraph for Navy projects. When directed to meet seismic
requirements for UPS enclosure anchoring, Section 13 48 00 and 26 05 48.00 10
must be edited to suit the project and be included in the contract documents.
Edit the following paragraph and include it in the project specification. When
the Government designer is the Engineer of Record and for Navy projects, provide
seismic requirements on the drawings.
The UPS enclosure shall [conform to [Section 13 48 00 SEISMIC PROTECTION FOR MISCELLANEOUS EQUIPMENT][ and to
][26 05 48.00 10 SEISMIC PROTECTION FOR ELECTRICAL EQUIPMENT]][be as indicated].
3.1.6 Conduit Entries
Conduit entries shall use the available conduit areas shown on manufacturer's installation drawings. Conduit
entries shall not be made through the front, side or rear panels of the UPS[ or Maintenance Bypass Cabinet].
[3.1.7 Battery Rack Assembly
NOTE: Choose this paragraph or the one below
entitled "Battery Cabinet".
Battery racks are typically shipped dismantled in separate rail, frame, and brace packages. Ensure that manufacturer
furnished assembly hardware is used to assemble battery racks. Installation of battery racks shall conform to
the manufacturer's instructions.
][3.1.8 Battery Cabinet Assembly
Battery cabinets are typically factory assembled for up to 100 KVA UPS systems. Battery cabinets for larger
units typically require assembly at the site. Installation of battery cabinets shall conform to the manufacturer's
instructions.
][3.1.9 Battery Installation
NOTE: Delete paragraph and subparagraphs for smaller UPS units that have batteries
installed in the unit cabinet by the manufacturer at the factory.
Installation of batteries shall conform to the manufacturer's instructions.
]3.2 FIELD QUALITY CONTROL
NOTE: The UPS manufacturer's technical representative is required to inspect
the completed UPS and battery installation. The representative's visit to the
site must be scheduled by the Contractor.
Contractor shall notify Contracting Officer in writing at least 45 calendar days prior to completion of the UPS
system installation. At this time the Contractor, will schedule the UPS manufacturer's technical representative
to inspect the completed installation. The UPS technical representative shall provide instruction for activity
personnel as specified in paragraph titled "DEMONSTRATION".
3.2.1 Installation Preparation
NOTE: In subparagraph b. choose either battery racks or cabinets based on the
UPS size and configuration.
In subparagraph o. delete the bracketed statement when the project does not
require a UPS maintenance bypass cabinet.
The following items shall be completely installed by the Contractor and be operational prior to the arrival of
the UPS representative for inspection, unit start-up and testing:
a. Ventilation equipment in the UPS and battery rooms.
b. Battery [racks][cabinets] and cells. This is not applicable for maintenance-free battery.
c. Battery connections including cell-to-cell, tier-to-tier, and rack-to-rack connections,
with correct polarity;
d. DC power and control connections between UPS and battery circuit breaker, with correct polarity;
e. DC power connection between battery circuit breaker and battery, with correct polarity;
f. Clockwise phase rotation of ac power connections;
g. AC power to rectifier input bus;
h. AC power to UPS bypass input bus;
i. AC power to UPS maintenance bypass circuit breaker;
j. AC power from UPS output to UPS maintenance bypass output circuit breaker;
k. Remote monitors and control wiring;
l. UPS system and battery system properly grounded;
m. Emergency shower and eye wash;
[n. Control connections between UPS and emergency engine generator signal contacts;
]o. Control connections between UPS module [and UPS maintenance bypass cabinet];
p. Clean and vacuum UPS and battery room floors, battery cells, and UPS equipment, both inside
and outside.
q. Ensure that shipping members have been removed.
r. Provide IEEE Std 450 battery installation certification.
3.2.2 Initial Inspection and Tests
The UPS technical representative and the Contracting Officer, in the presence of the Contractor, will inspect
the completed installation. The Contractor shall correct construction or installation deficiencies as directed.
Perform acceptance checks in accordance with the manufacturer's recommendations and include the following visual
and mechanical inspections, performed in accordance with NETA ATS.
a. Visual and mechanical inspection
(1) Compare equipment nameplate data with drawings, specifications and approved shop drawings.
(2) Inspect physical and mechanical condition. Inspect doors, panels, and sections for paint, dents,
scratches, fit, and missing hardware. Inspect the displays for scratches, dark pixels or uneven brightness.
(3) Inspect anchorage, alignment, grounding, and required clearances.
(4) Verify that fuse sizes and types correspond to drawings.
(5) Verify the unit is clean inside and out.
(6) Test all electrical and mechanical interlock systems for correct operation and sequencing.
(7) Inspect bolted electrical connections for high resistance using one of the following methods:
(a) Use a low-resistance ohmmeter.
(b) Verify tightness of accessible bolted electrical connections by calibrated torque-wrench
method.
(c) Perform thermographic survey.
(8) Verify operation of forced ventilation.
(9) Verify that vents are clear and new clean filters are installed.
3.2.3 Performance Tests
Provide equipment, test instruments, power, load bank, materials and labor required for tests. Contracting Officer
will witness all tests and the tests shall be subject to his approval. Perform tests in accordance with the
manufacturer's recommendations and include the following electrical tests.
3.2.3.1 UPS Unit Performance Tests
Upon completion of battery activation procedures, Contractor shall connect load bank to UPS output. Load bank
required shall be determined by the following:
UPS KVA RATING X 0.8 = KW of LOAD BANK
Performance test is to be run under the supervision of the UPS technical
representative. UPS unit shall be operated under full load for a minimum of one hour. Contractor shall be required
to operate feeder and bypass power feeder breakers during testing of the UPS.
a. Electrical Tests
(1) Perform resistance measurements through bolted connections with a low-resistance ohmmeter.
(2) Test static transfer from inverter to bypass and back. Use normal load, if possible.
(3) Set free running frequency of oscillator.
(4) Test dc undervoltage trip level on inverter input breaker. Set according to manufacturer's published
data.
(5) Test alarm circuits.
(6) Verify synchronizing indicators for static switch and bypass switches.
(7) Perform electrical tests for UPS system breakers.
(8) Perform electrical tests for UPS system batteries.
b. Test Values
(1) Compare bolted connection resistances to values of similar connections.
(2) Verify bolt-torque levels.
(3) Micro-ohm or millivolt drop values shall not exceed the high levels of the normal range as indicated
in the manufacturer's published data. If manufacturer's data is not available, investigate any values
which deviate from similar connections by more than 50 percent of the lowest value.
[ c. Load Test
NOTE: Edit as required, depending upon whether a
temporary or permanent load bank is to be provided
and on the type of UPS system. This paragraph may
be deleted for small UPS systems.
The installed system shall be load tested for a continuous 24 hour period
by means of resistive load banks. The system shall be continuously tested
at 1/2 load for 8 hours, 3/4 load for 8 hours and full load for 8 hours.
Provide resistive load banks of total kW load of equipment to facilitate startup under load conditions, and to
conduct load tests described above.
Instrument readings shall be recorded every half hour for the following:
(1) Input voltage (all three phases).
(2) Input current (all three phases).
(3) Input frequency.
(4) Battery voltage.
(5) Output voltage (all three phases).
(6) Output current (all three phases).
(7) Output kilowatts.
(8) Output frequency.
][d. Full Load Burn In Test
NOTE: Delete emergency source testing requirements if no emergency source is
available. This paragraph may be deleted for small UPS system.
The installed system shall undergo an additional full load burn-in period
of 24 continuous hours. If a failure occurs during the burn-in period, the
tests shall be repeated. Instrument readings shall be recorded every half
hour as above. During the burn-in period, the following tests shall be
performed:
(1) With the UPS carrying maximum continuous design load and supplied
from the normal source, switch [100 percent load][50 percent load] on and off a minimum of five times
within [the burn-in period] [_____].
[(2) With the UPS carrying maximum continuous design load and supplied from the emergency source, repeat
the switching operations
described in step a. Also, verify that the UPS module rectifier
charger unit(s) go into the second-step current limit mode.]
(3) With the UPS carrying maximum continuous design load and operating on battery power, repeat the
switching operations described in step a above.
(4) Continue operation on battery power for 1 minute, then restore
normal power.
The Contractor shall furnish a high-speed dual trace oscillograph to
monitor ten or more cycles of the above tests at the ON and OFF transitions and two typical steady-state periods,
one shortly after the load is
energized (at 30 to 60 seconds) and one after operation has stabilized (at
8 to 10 minutes). Four copies of the traces shall be delivered to the
Contracting Officer.
][e. Battery Discharge Test
NOTE: This paragraph may be deleted for small UPS system.
With the battery fully charged, the system shall undergo a complete battery discharge test to full depletion
and a recharge to nominal conditions.
Instrument readings shall be recorded every minute during discharge for the following:
(1) Battery voltage.
(2) Battery current.
(3) Output voltage (all three phases).
(4) Output current (all three phases).
(5) Output kilowatts.
(6) Output frequency.
][3.2.3.2 Emergency Generator Operation
NOTE: Include this paragraph only when the UPS will be installed in conjunction
with an emergency generator.
Test UPS to observe operation with emergency generator service. UPS technical representative shall verify UPS
battery current limiting feature functions properly.
][3.2.3.3 Battery Performance Test (Constant KW)
NOTE: This paragraph is applicable for large wet-cell type battery systems.
Delete for sealed (valve regulated) battery system.
Furnish all labor, material and test equipment necessary to conduct performance test under the direction of UPS
technical representative. The following shall be accomplished:
a. Install a calibrated voltmeter across the battery terminals to measure voltage, and install a calibrated
voltmeter across the UPS dc shunt to read charging current. UPS technical representative will advise
connection to dc shunt.
b. Record temperature of pilot cells in battery immediately prior to start of discharge performance
test.
c. Read and record total battery voltage and battery current at start of discharge and every minute
during discharge test.
d. Record minutes and seconds when battery voltage drops below minimum discharge voltage of 291 volts
dc. On initial discharge test, a battery may be expected to deliver 95 percent of its rated capacity.
This will increase to 100 percent after several complete discharge cycles or after 12 months of float
charge service.
e. Should battery fail to meet the requirements of the first discharge performance test, open the inverted
output breaker. Then put battery on equalizing charge, with rectifier adjusted to normal equalizing voltage
of [424][_____] volts dc. Equalize for a minimum of [100][_____] hours. Measure and record time and battery
voltage. Run a second discharge performance test.
]3.3 DEMONSTRATION
NOTE: Delete video tape references if not required.
3.3.1 Instructing Government Personnel
Furnish the services of competent instructors to give full instruction to designated Government personnel in
the adjustment, operation, and maintennace of the specified systems and equipment, including pertinent safety
requirements as required. Instructors shall be thoroughly familiar with all parts of the installation and shall
be trained in operating theory as well as practical operation and maintenance work. Instruction shall be given
during the first regular work week after the equipment or system has been accepted and turned over to the Government
for regular operation. Provide [8][_____] hours of instruction for [_____] personnel.[ When more than 4 man-days
of instruction are specified, use approximately half of the time for classroom instuction. Use other time for
instruction with equipment or system. When significant changes or modifications in the equipment or system are
made under the terms of the contract, provide additional instructions to acquaint the operating personnel with
the changes or modifications.][ Field training shall be videotaped and the tape shall be left with the Contracting
Officer.][ A factory training videotape shall be provided as part of the training materials.]
3.4 FINAL ADJUSTMENTS
a. Remove load bank and reconnect system for normal operation.
b. Equalize battery at [424][_____] volts for a period of [72]
[_____] hours.
NOTE: Delete this paragraph if battery is sealed (valve regulated) type.
[c. Bring electrolyte level of all cells up to the bottom of the high level line by adding original filling
gravity electrolyte.
]d. Resume charging battery at normal float voltage of [411][_____] volts dc.
e. Check battery connections are properly torqued to manufacturer's specifications. Take and record,
for cell-to-cell and terminal connections, detailed micro-ohm resistance readings. Remake connections
having a resistance of more than 10 percent above the average.
f. All manufacturer's data and operation manuals, which are an integral part of, and shipped with UPS,
shall be delivered to Contracting Officer.
3.5 NAMEPLATE MOUNTING
Provide number, location, and letter designation of nameplates as indicated. Fasten nameplates to the device
with a minimum of two sheet-metal screws or two rivets.
3.6 FIELD APPLIED PAINTING
Paint electrical equipment as required to match finish of adjacent surfaces or to meet the indicated or specified
safety criteria. Painting shall be as specified in Section 09 90 00 PAINTS AND COATINGS.
3.7 DISPOSAL
Upon completion of UPS installation and testing, Contractor shall remove and dispose of empty, partially full
and excess acid drums, including shipping containers, obsolete batteries, and obsolete UPS modules. Removal shall
be accomplished off-base and in conformance with local laws and regulations regarding disposal of hazardous material.