USACE / NAVFAC / AFCESA / NASA UFGS-26 35 43 (April 2006)
-------------------------------
Preparing Activity: NAVFAC Replacing without change
UFGS-16268 (August 2005)
UNIFIED FACILITIES GUIDE SPECIFICATIONS
References are in agreement with UMRL dated January 2009
SECTION 26 35 43
400-HERTZ (HZ) SOLID STATE FREQUENCY CONVERTER
04/06
NOTE: This guide specification covers the requirements for the procurement,
installation, and testing of 400 Hz solid state frequency converters.
Edit this guide specification for project specific requirements by adding, deleting,
or revising text. For bracketed items, choose applicable items(s) or insert
appropriate information.
Remove information and requirements not required in respective project, whether
or not brackets are present.
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).
NOTE: These converters are used to supply 400 Hz electrical power to aircraft
and ships in shore facility environments. Typical applications include aircraft
operating in flight line conditions or in hangars, avionics shops, laboratories,
training buildings, flight simulators, and computer rooms. This specification
is not to be used for procurement of power converters installed on board aircraft
or ships. This specification is not intended for medium-voltage applications.
NOTE: The following information shall be shown on the project drawings:
1. Show location of all equipment including converter, paralleling panels,
remote monitoring and control panel.
2. Provide functional block diagram, single line diagrams, power, and control
wiring interconnection diagrams, wiring diagrams, conduit entry diagrams, equipment
elevations, limiting dimensions, and equipment ratings which are not covered
in the specifications.
3. Design 400 Hz equipment rooms with working spaces as required by NFPA 70.
Provide ventilation for equipment rooms based on 400 Hz components heat load
generated when operating at 100 percent load. Provide 60 Hz convenience receptacles.
NOTE: Ensure that the 400 Hz distribution system is properly coordinated including
the ratings of the power cables, ground cables, circuit breakers, transformers,
filters, rectifiers, and control equipment. When replacing a motor generator
set with a solid state converter ensure that the existing feeders circuit protective
devices will operate properly without damage to electrical devices including
the solid state converter.
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.
[INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)IEEE C2(2007; Errata 2007; INT 2008) National Electrical Safety CodeIEEE 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 1159(1995; R 2001) Recommended Practice on Monitoring Electric Power QualityIEEE Std 519(1992; Errata 2004) Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems][INTERNATIONAL ELECTROTECHNICAL COMMISSION (IEC)IEC 60947-4-1(2000; Amendment 1 2002; Amendment 2 2005) Low-voltage Switchgear and Controlgear, Part 4-1: Contactors and Motor Starters Electromechanical Contactor and Motor Starters][NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)NEMA 250(2003) Enclosures for Electrical Equipment (1000 Volts Maximum)NEMA ST 20(1992; R 1997) Standard for Dry-Type Transformers for General Applications][NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)NFPA 70(2007; AMD 1 2008) National Electrical Code - 2008 Edition][SOCIETY OF AUTOMOTIVE ENGINEERS INTERNATIONAL (SAE)SAE AS5756/6(2004) Cable, 3-Phase Power, Electric Portable, Multiconductor, 90 Degree C, 600V, Ozone Resistant, Split Phase][U.S. DEPARTMENT OF DEFENSE (DOD)MIL-PRF-24021(Rev K) Electric Power Monitors, External AircraftMIL-STD-1399-300(Rev B) Interface Standard for Shipboard Systems Section 300A Electric Power, Alternating Current (Metric)MIL-STD-461(Rev F) Requirements for the Control of Electromagnetic Interference Characteristics of Subsystems and EquipmentMIL-STD-704(Rev G) Aircraft Electric Power Characteristics][UNDERWRITERS LABORATORIES (UL)UL 1012(2005; Rev thru Oct 2008) Power Units Other than Class 2UL 1449(2006) Surge Protective DevicesUL 489(2002; Rev thru Jun 2006) Standard for Molded-Case Circuit Breakers, Molded-Case Switches and Circuit-Breaker EnclosuresUL 506(2000; Rev thru May 2006) Standard for Specialty Transformers]1.2 GENERAL REQUIREMENTS
Section 26 00 00.00 20 BASIC ELECTRICAL MATERIALS AND METHODS, applies to this section with addition and modifications
specified herein.
1.3 SUBMITTALS
NOTE: Review submittal description (SD) definitions in Section 01 33 00 SUBMITTAL
PROCEDURES and edit the following list to reflect only the submittals required
for the project. Submittals should be kept to the minimum required for adequate
quality control.
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: "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, Air Force,
and NASA projects.
Choose the first bracketed item for Navy, Air Force and NASA projects, or choose
the second bracketed item for Army 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
Frequency converter drawings[; G][; G, [_____]]
SD-03 Product Data
Frequency converter[; G][; G, [_____]]
Aircraft power cable assembly[; G][; G, [_____]]
[Remote Monitoring and Control Panel[; G][; G, [_____]]]
SD-06 Test Reports
Work Plan[; G][; G, [_____]]
Routine Factory Test Plan[; G][; G, [_____]]
Special Factory Test Plan[; G][; G, [_____]]
Performance Test Plan[; G][; G, [_____]]
Test Schedule[; G][; G, [_____]]
Routine Factory Tests[; G][; G, [_____]]
Special Factory Tests[; G][; G, [_____]]
SD-07 Certificates
Qualifications of manufacturer; [; G][; G, [_____]]
UL Listing; [; G][; G, [_____]]
SD-09 Manufacturer's Field Reports
Initial Inspection and Tests[; G][; G, [_____]]
Performance Tests[; G][; G, [_____]]
Training Syllabus[; G][; G, [_____]]
SD-10 Operation and Maintenance Data
Frequency converter, Data Package 5[; G][; G, [_____]]
Preliminary Operation and Maintenance Manuals, Data Package 5[; G][; G, [_____]]
Remote Monitoring and Control Panel, Data Package 5[; G][; G, [_____]]
1.4 QUALITY ASSURANCE
1.4.1 Frequency Converter Drawings
Furnish scaled drawings of enclosure outline including front, top, side views, and overall dimensions. Provide
external power and control wiring and cable connections. Provide single line, schematic, and wiring diagrams.
Drawings shall include details of input and output circuit breakers, contactors, rectifiers, surge protectors,
and control devices. Drawings shall include conduit entry and exit locations. If parallel operation is included,
provide an interconnection diagram.
1.4.2 Qualifications of Manufacturer
NOTE: The experience clause in this section has been approved by a Level I
Contracting Officer in accordance with the requirements of NAVFAC P-68. This
clause may be used without further approval or request for waiver.
Submit a certification that the manufacturer has a minimum of five (5) years' experience in the design, manufacturing,
and testing of 400 Hz solid state frequency converters at the same or equivalent kVA and voltage ratings for
direct connection to aircraft electrical loads. When specifications require multiple converters operating in
parallel, the manufacturer shall provide specific experience with equal or greater kVA rated converters.
The certification shall state that the manufacturer is experienced in manufacturing and testing solid state converters
of an equivalent or greater kVA rating. Experience in manufacturing motor generator sets does not qualify as
equivalent. Experience in manufacturing portable engine-driven 400-hertz power units does not qualify as equivalent.
The manufacturer shall be experienced in producing units for installation in permanent buildings in environmentally
closed spaces or in weatherproof enclosures as applicable. The manufacturer shall also document that converters
are designed for connection to non-linear loads typically encountered in the aircraft and shipbuilding industries.
The manufacturer shall furnish documented experience with converters in various environmental conditions including
exterior flight line, hangar, and environmentally enclosed spaces within buildings.
1.4.3 Work Plan
Submit a written schedule of dates of routine and special factory tests, installation, field tests, and operator
training for the converter system. Furnish a list of instrumentation equipment for factory and field test reports.
1.4.4 Routine Factory Test Plan
Submit 7 copies of 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
converter meets the performance specification and explain the test methods to be used. As a minimum, the test
procedures shall include the tests required under the paragraph entitled "Routine Factory Tests."
1.4.5 Special Factory Test Plan
Submit 7 copies of test plans and procedures with the Routine Factory Test Plan. Provide detailed description
of test procedures, including test equipment and setups, used to ensure the converter meets the performance specification
and explain the test methods used. As a minimum, the test procedures shall include the tests required under
the paragraph entitled "Special Factory Tests."
1.4.6 Performance Test Plan
Submit 7 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 converter 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 "Field Quality Control." Test reports shall include power quality measurement
data collected in accordance with IEEE Std 1159.
1.4.7 UL Listing
Submit with the initial submittal to verify qualification of manufacturer. Frequency converter shall be identified
with a UL or nationally recognized testing laboratory (NRTL) label prior to shipping.
1.4.7.1 Currently Listed Products
Submit UL or NRTL certification or UL file number for the actual frequency converter to be shipped.
1.4.7.2 Proposed Listed Products
Submit UL or NRTL certification or UL file number for same or similar rating or product size range of like design
unit.
1.4.8 Routine Factory Tests Report
Submit within [45][_____] calendar days after completion of tests. Receive approval of test prior to shipping
unit. Certify tests were conducted on each converter in accordance with the requirements set forth in paragraph
entitled "Routine Factory Tests" and certify converter satisfactorily operated within specified limits. Report
shall include copies of the test procedures, test data, and results.
1.4.9 Special Factory Tests Report
Certify tests were conducted on a converter of the same design, construction and kVA and voltage rating to be
provided and in accordance with the requirements set forth in paragraph entitled "Special Factory Test" and certify
converter operated without malfunctioning within specified limits. Report shall include copies of the test procedures,
test data, and results.
1.4.10 Performance Tests Report
Submit report of test results as specified by paragraph entitled "Field Quality Control" within [15][____] calendar
days after completion of tests. Certify tests were conducted on each converter in accordance with the paragraph
entitled "Field Quality Control" and certify converter satisfactorily operated within specified limits. Report
shall include copies of the test procedures, test data, and results.
1.5 MAINTENANCE
1.5.1 Operation and Maintenance Manuals
Submit frequency converter operation and maintenance manuals in accordance with Section 01 78 23 OPERATION AND
MAINTENANCE DATA.
1.5.1.1 Additions to Operation and Maintenance Manuals
In addition to requirements of Data Package 5, include the following on the actual frequency converter provided:
a. A "one-line diagram" from service entrance to 400 Hz utilization panel or point.
b. A weatherproof, tear-resistant plastic data sheet with operating instructions for each unit
including startup, shutdown[, and paralleling] procedures.
c. Routine and field acceptance test reports.
d. UL or NRTL certification or UL file number.
1.5.1.2 Preliminary Operation and Maintenance Manuals
Prior to scheduling Field Performance Tests, 2 copies of a Preliminary Operation and Maintenance Manual must
be submitted to and approved by the Contracting Officer.
1.5.1.3 Extra Material
NOTE: Delete ventilation system filters except for frequency converters located
outdoors or in areas subject to a high level of airborne contaminants.
Furnish recommended manufacturer's spare parts list and schedule of prices for each type of converter and other
equipment specified in this section. This list shall include the following:
a. Power semi-conductors
b. Power filter capacitors
c. Plug-in logic cards
d. Output switching modules
e. Fuses
f. Indicator lamp/LED
[g. Ventilation system filters]
PART 2 PRODUCTS
2.1 FREQUENCY CONVERTER
NOTE: Do NOT edit this paragraph to specify the type of power supply or switching
technology to be utilized (i.e. six-step waveform type or PWM type). Specifying
this type of technology may make this a sole source specification which requires
justification and approval per federal contract law.
Provide frequency converter consisting of modular construction solid-state components for [50][60] to 400 Hz
conversion, input/output devices, and ancillary control devices. Frequency converter shall be a standard product
of the manufacturer and shall be the manufacturer's latest design that complies with the specification requirements.
The 400 Hz frequency converters provided under this contract shall be products of the same manufacturer. The
unit shall have a calculated MTBF exceeding [24,000][_____] hours as calculated when the converter is provided
with yearly servicing and maintenance. The converter shall be UL or third party listed to comply with UL 1012
. Circuit breakers operating at 400 Hz shall be designed and UL tested for 60 Hz operation and derated for 400
Hz operation. The converter shall use a minimum 12 pulse or active input rectification circuit. Provide startup
and shutdown instructions posted on the front of the unit using engraved plastic plate. Provide a plastic encapsulated
schematic diagram attached to the inside of the unit in clear view of maintenance personnel.
2.1.1 Electrical Characteristics
2.1.1.1 Input Voltage
NOTE: For units 15 kVA and below the input voltage should be 208 volts and
for units over 15 kVA the preferred input voltage is 480 volts. Using input
voltage other than 480 volts will increase the cost and weight and decrease
the efficiency of the converter. The input voltage shall be shown on the construction
drawings.
[480Y/277][208Y/120][_____] V, three phase, four wire, grounded, [60][50] Hz. Converter shall provide rated
output voltage when input voltage is varied plus or minus [10][_____] percent. Input neutral currents shall
not exceed [21][_____] percent of any individual phase current at no load and at full load.
2.1.1.2 Input Power Factor
Between 0.8 lagging and unity, under all conditions of steady state line and load variations specified herein.
2.1.1.3 Surge Protection
NOTE: Select Location Category C for outdoor locations only.
The converter shall be capable of sustaining an input surge described in and tested in accordance with UL 1449
, and IEEE C62.41.1 and IEEE C62.41.2, Location Category [B] [C], and continue to operate with no alarms within
the specified tolerance.
2.1.1.4 Inrush Current
The inrush current shall not exceed 100 percent of the rated full load input current. Inrush current limitation
is based on a frequency converter that does not require a transformer at the input to the unit. Should the contractor
choose to provide a frequency converter with a transformer at the input to the unit, the contractor shall be
responsible for increasing the size of the upstream feeder breaker(s) and increasing the size of conductors and
raceways in accordance with NFPA 70.
2.1.1.5 Input Current Distortion
NOTE: Where total connected frequency converter load is a small percentage
(less than 40 percent) of the total connected facility load, use 12 percent
THD and 8 percent individual. For large frequency converters (i.e. 312 kVA
or larger) or where total connected frequency converter load is a significant
percentage of the total connected facility load, use 5 percent THD and 3 percent
individual. For installation in shipboard environments, use 5 percent THD and
3 percent individual.
Input current THD shall not exceed [12][5]-percent of the fundamental with nominal input voltage at full load.
Individual harmonic content shall not exceed [8][3]-percent of the fundamental.
2.1.1.6 Output Voltage
NOTE: Use MIL-STD-704, when 400 Hz power is required to power aircraft avionic
equipment. Aircraft equipment is normally operated 200Y/115 V, three-phase,
400 Hz, grounded. MIL-HDBK-1004/5 contains aircraft electrical demand loads.
Use MIL-STD-1399-300, when 400 Hz power is required to power laboratory test
benches simulating shipboard environments. Shipboard equipment in simulated
shore laboratory environments normally operated on a 440 V, three-phase, 400
Hz, ungrounded system.
[200Y/115 V, three phase, 400 Hz, grounded][440 V, three phase, 400 Hz, delta connected ungrounded] system.
[Adjustable to plus or minus 10 percent of the rated voltage.] The limits overvoltage and undervoltage shall
be [as defined in MIL-STD-704][as defined in MIL-STD-1399-300 Type [II][III] power][plus or minus [2][_____]
percent]. The phase rotation of the output voltage shall be clockwise sequence of [A-B-C][AB-BC-CA]. Converters
shall be designed for compatibility with ship and aircraft power monitors complying with MIL-PRF-24021.
2.1.1.7 Power Output
NOTE: Unit that will be used for providing power for aircraft should be sized
for the type and number of aircraft to be supplied. The recommended sizes for
units supporting aircraft are 60, 90, 120, or 250, 312, 325, or 375 kVA.
[______] kVA at 0.8 power factor lagging.
2.1.1.8 Load Range
Operate into a linear load with a power factor between 0.5 lagging and 0.8 leading and into a non-linear load
with not less than 15% current THD, composed of not less than 6% of the 3rd harmonic and not less than 7% of
the 5th harmonic.
2.1.1.9 Efficiency
NOTE: Use the table below to fill in the kVA and minimum efficiency.
Minimum Percent Efficiency
Rating (kVA) 50 Percent Load 100 Percent Load
5 - 14 80 90
15 - 39 86 90
40 - 99 87 91
100 - up 89 92
Adding EMI filtering for units with power rating larger than 15 kVA, will reduce
the efficiency of the unit. If EMI filtering is specified for units with power
rating larger than 15 kVA, reduce minimum efficiency by 2 percent.
The [_____] kVA units shall have a minimum efficiency of [_____] at 50 percent load and [_____] at 100 percent
load. For a frequency converter that requires a transformer at the input to the unit, reduce the specified efficiencies
by 2%.
2.1.1.10 No Load Input Losses
NOTE: Above 30 kVA, use 7%, below 30 kVA, use 9%.
The frequency converter shall have no-load input losses no greater than [7] [9][_____] percent of the output
kW rating. For a frequency converter that requires a transformer at the input to the unit, increase the specified
no load input losses by 2%.
2.1.1.11 Overload/Overcurrent
Satisfactory overload/overcurrent operating time is based on no more than one overload in any 4 consecutive hours
of operation:
Percent of Full Load Satisfactory Operating Time
110 percent 60 minutes
125 percent 5 minutes
150 percent 2 minutes
200 percent 20 seconds
300 percent 6 seconds
After minimum operating time is achieved, unit shall interrupt output power. Unit shall be capable of sustaining
the overload/overcurrent without damage until the protective device interrupts the overload/overcurrent.
2.1.1.12 Short Circuit
When [a bolted line-to-ground fault,] a bolted line-to-line fault, or a bolted three phase fault is applied to
the unit, unit shall be capable of sustaining the short circuit current without damage until the protective device
interrupts the fault.
2.1.1.13 Output Voltage THD
a. Balanced load:
(1) Output voltage THD: Not to exceed [3][_____] percent line-to-line and line-to-neutral
for linear loads as specified in the paragraph entitled "Load Range".
(2) Output voltage THD: Not to exceed [5][ ] percent line-to-line and line-to-neutral for
non-linear loads as specified in the paragraph entitled "Load Range".
(3) Maximum single harmonic distortion: Not to exceed [2][ ] percent of the fundamental at
the nominal voltage for linear loads as specified in the paragraph entitled "Load Range".
(4) Maximum single harmonic distortion: Not to exceed [3][ ] percent of the fundamental at
the nominal voltage for non-linear loads as specified in the paragraph entitled "Load Range".
b. Unbalanced load: Output voltage THD not to exceed 4 percent, line-to-neutral with 15 percent
unbalanced linear load.
2.1.1.14 Output Voltage Amplitude Modulation
Output voltage amplitude modulation shall not exceed 1/2 percent of nominal voltage at no load to full load.
2.1.1.15 Frequency Stability
Provide a high frequency crystal clock to control output frequency of the 400 Hz converter within plus or minus
0.5 percent for all operating conditions, including maximum and minimum specified input voltages, ambient temperature
and relative humidity. The frequency regulation shall operate independent of supply frequency and load changes.
2.1.1.16 Phase Angle Regulation
Displacement angle between adjacent voltage phases shall be 120 degrees plus or minus 2 degrees with balanced
load and plus or minus 4 degrees with three phase 15 percent unbalanced load. A 15 percent unbalanced load is
defined as:
a. Phase A at full rated single phase load.
b. Phase B at 85 percent of Phase A.
c. Phase C at 85 percent of Phase A.
2.1.1.17 Transient Output Voltage Recovery
NOTE: Use MIL-STD-704, when 400 Hz power is required to power aircraft avionic
equipment.
Use MIL-STD-1399-300, when 400 Hz power is required to power shipboard equipment.
[In accordance with MIL-STD-704.][In accordance with MIL-STD-1399-300 for Type [II][III] power.]
2.1.2 Environmental Rating
The converter shall operate satisfactorily from no load to rated full load under the following conditions:
a. Ambient temperatures ranging from 0 degrees C to 55 degrees C.
b. Relative humidity from [0 to 95] [_____] percent noncondensing.
c. Ambient pressures from sea level to [915] [_____] meters [3,000] [_____] feet.
2.1.3 Monitoring and Control Panel
Provide converter with a control panel that is equipped with the following controls, indicators, instrumentation,
data logging, diagnostics, and alarm functions.
2.1.3.1 Controls
a. Start/stop pushbutton.
b. Lamp/light emitting diode (LED) test - A push-to-test button or switch to test indicator
lamps/LEDs.
[c. Alarm silence - A switch that shall disable the audible alarm.]
d. Alarm reset - A pushbutton to silence audible alarms.
e. Emergency power off - A separate pushbutton for emergency power off.
[f. Circuit breaker.]
[g. Output contractor ON/OFF]
[h. Output voltage adjust.]
2.1.3.2 Indicators
a. Input power available - Lamp/LED to indicate that the supply voltage is available.
b. Output power On/Off - Lamp/LED to indicate that the converter output voltage is available.
c. System alarm - Lamp/LED to indicate that a fault has been detected. This indicator shall
be latched in the "ON" position whenever an alarm condition described in paragraph entitled,
"Alarm Annunciator," is detected and shall remain "ON" until the alarm reset pushbutton is pressed.
d. Indicating lamp/LED to indicate that the alarm silence switch is in the disable position.
e. Audible alarm.
[f. Output contactor "ON".]
[g. Aircraft interlock bypass - Lamp/LED to indicate that the Aircraft Interlock has been bypassed.]
[2.1.3.3 Digital Instrumentation
NOTE: Select digital instrumentation unless frequency converter is located
outside where sunlight glare will make digital LCD display difficult to read.
For delta output frequency converters, delete phase-to-neutral voltage and neutral
current display requirements. Include option for THD metering only if specifically
required by customer. It is expensive and not normally needed.
Provide true rms, plus/minus one percent accuracy, microprocessor-based meter with a simultaneous three-line
LCD display. Meter shall display elapsed time (in hours). Meter shall display a selected [output phase-to-neutral
voltage,] output phase-to-phase voltage, output phase current, [output neutral current,] and output frequency.
[Meter shall display selected [output percent phase-to-neutral voltage THD, ]output percent phase-to-phase voltage
THD, output percent phase current THD[, and output percent neutral current THD]. Meter shall provide THD measurement
to the thirty-first order.]
][2.1.3.4 Instrumentation
a. Elapsed time meters (in hours).
b. Output voltmeter selector switch having three [phase-to-phase positions for monitoring delta
outputs in accordance with MIL-STD-1399-300][phase to neutral positions for monitoring wye voltage
outputs in accordance with MIL-STD-704] and one "OFF" position.
c. Output ammeter selector switch having three phase positions and one "OFF" position.
d. Output frequency meter, 395 to 405 HZ scale, having a 400 HZ center with an ON-OFF switch.
]2.1.3.5 Alarm Annunciator
The unit shall be capable of detecting the following abnormal conditions, sounding an audible alarm and illuminating
individual indicator lamp/LEDs that are clearly identified:
a. Input overvoltage.
b. Input undervoltage.
c. Output undervoltage.
d. Output overvoltage.
e. Output overload.
f. System alarm.
g. Control logic failure.
h. Overtemperature.
i. Logic power supply failure.
2.1.4 Input/Output Devices
Provide fully-rated, three-pole, UL approved devices for control of [50] [60] Hz input and 400 Hz output from
the converter. Devices and cables operating at 400 Hz shall be derated in accordance with IEEE Std 519.
2.1.4.1 Circuit Breaker
Conform to requirements of UL 489. Units operating at 400 Hz shall be derated for 400 Hz operation.
2.1.4.2 Input Circuit Breaker
Provide converter with a UL listed input circuit breaker as an integral part of the converter. Breaker shall
be operable from the front of the converter. Breaker shall have a short-circuit current rating of [____] amperes
symmetrical minimum.
2.1.4.3 Output Contactor
Provide converter output with an automatic magnetically-held contactor with interlock circuit. Output contactor
shall be of sufficient capacity to handle rated load, overload, and available short circuit current. Contactor
shall open when any circuit identified in the paragraph entitled "Protective Control" causes the system to shut
down. Output contactor shall be electrically interlocked with ON/OFF circuitry so that when the frequency converter
is shut down, the contactor shall open immediately and remain open. [Conform to the requirements of IEC 60947-4-1.]
[2.1.4.4 Output Circuit Breaker
NOTE: Add output circuit breaker only if frequency converter is supplying downstream
distribution panelboard or multiple outputs with distribution internal to the
frequency converter.
Provide converter output with a non-automatic manual circuit breaker with appropriate frame size and a shunt
trip coil derated for 400 Hz operation. Circuit breaker shall be tripped by the unit's OFF circuit [local or
remotely activated] and when any circuit identified in the paragraph entitled "Protective Control" causes the
system to shut down. Output breaker shall be operable from the front of the unit.
][2.1.4.5 Aircraft Interlock Circuit
NOTE: Aircraft interlock circuit is not normally required when providing power
to Navy aircraft. Use only when requested by Air Force or other DOD claimants.
Coordinate with specified aircraft cable assembly.
Interlock circuit shall determine the presence or absence of the 28 VDC feedback signal from the aircraft. Interlock
circuit shall not allow the output disconnect to close if the 28 VDC signal is not present. If the output disconnect
is closed when the 28 VDC is lost, the disconnect shall open within 2 seconds. Converter shall contain terminal
block points for the connection of two 12 AWG wire from the aircraft cable assembly for the interlock circuit.
Interlock circuit shall not draw more than 20 milliamperes from the aircraft's 28 VDC circuit. For testing purposes,
provide a switch inside the converter with two positions:
a. Normal - For aircraft loads.
b. Bypass - For testing with dummy load or no load, or for use with aircraft with no 28 VDC.
]2.1.5 Protective Controls
Provide circuitry for the following protective controls.
a. Input undervoltage.
b. Input overvoltage.
c. Loss of phase.
d. Loss of input power.
e. Door interlock - When any access door is opened, the interlock circuitry shall open the
[60][50] Hz input device [and 400 Hz output device] and not allow the input [or output] device
to close. For maintenance purposes, provide a bypass switch to defeat the interlock circuitry.
f. Output overvoltage - Protect by tripping output devices for instantaneous overvoltage of
30 percent or more and for 10 to 30 percent overvoltage lasting more than 0.25 second.
g. Output undervoltage - Protect by preventing the closing of the output disconnect until the
output voltage is 95 percent of the rated output. If, after closing, the voltage decreases to
below 90 percent for longer than 5 seconds, provide relaying to trip output devices utilizing
a field-adjustable time-delayed circuit with a range of 4 to 10 seconds.
h. Output frequency - Protect by tripping output devices for frequency change in excess of
plus or minus 5 percent of the rated output frequency (400 HZ).
i. Output overload.
j. Converter overtemperature protection.
[2.1.6 Electromagnetic Interference Limits
NOTE: This is an additional cost item and reduces converter efficiency. EMI
filtering should not be specified unless specifically requested by the user.
Comply with MIL-STD-461 for Class C2 equipment.
]2.1.7 Automatic Line Drop Compensation
Provide automatic line drop compensation - 0 to 7 percent adjustable internally.
[2.1.8 Paralleling
NOTE: This is an additional cost item and should not be specified unless specifically
requested by the user.
Provide frequency converter capable of being paralleled. Paralleled units shall be same manufacturer and model
number. Regulate and control units operated in parallel by a master unit. Design controls associated with paralleling
of the units such that each frequency converter can operate as a stand alone unit, or as either a slave or master
unit in a parallel system. Units shall parallel and synchronize within a 50 millisecond recovery time. Share
the total load equally within plus or minus [____][5] percent by each unit. [Provide manual paralleling which
permits a paralleled unit to be added or removed from the system without interrupting the operation of other
units.]
][2.1.9 Auto Restart
NOTE: Auto restart should be considered when the converter is installed in
a remote location that is not readily accessible to operating personnel and
maintaining 400 Hz power is critical to operations. Use of auto restart should
be studied carefully to ensure that it does not create a potential personnel
safety hazard. This is an additional cost item and should not be specified
unless specifically requested by the user.
After a total input power outage the unit shall be capable of automatically restarting and re-energizing loads
upon restoration of normal power. Provide units with a manual/auto restart switch. If this requirement requires
a backup battery power supply this shall be provided. When interlock circuit has been interrupted or when interlock
is in the maintenance position manual restart, the system should not restart.
][2.1.10 Built-In Test Equipment
Frequency converter shall include built-in test equipment which monitors both primary circuits and protection
circuits of the unit. Provide visual indication to assist diagnosis of unit failures to a modular level. Provide
visual indication of converter status using cabinet mounted light emitting diodes.
][2.1.11 Magnetic Devices
Provide Class 180 power magnetic transformer and inductors in accordance with NEMA ST 20 and UL 506. The limits
of Class 180 shall not be exceeded at the maximum specified ambient temperature and at 100 percent load.
]2.1.12 Acoustical Noise
NOTE: The following table serves as a guide for establishing the maximum allowable
sound pressure level for each kVA rating. The designer should take into consideration
that converters are inherently noisy when locating the unit. Do not modify
these values unless required by the location of the frequency converter and
new values have been confirmed by manufacturer as attainable. If values different
than shown below are used, include acoustical noise test in Special Factory
Tests.
Maximum Allowable
Rating (kVA) Acoustical Noise (dBa)
5 - 14 65
15 - 39 65
40 - 99 68
100 - 249 72
250 - up 72
Maximum continuous acoustical noise level shall be [_____] dBa (A weighted scale).
2.1.13 Assembly Construction
NOTE: Delete "louvers" when specifying NEMA Type 4X and 12K enclosures.
Provide enclosures suitable for [indoor][outdoor][corrosive][direct spray] [_____] environments in accordance
with NEMA 250, Type [l][3][3R][4X][12K]. Arrange to provide required [louvers,] cooling air, entry and exit
provisions for equipment within enclosures. Construct unit(s) so that components, with the exception of control
and monitoring components, are totally enclosed within the enclosure. Electronic circuits including power circuits
shall be modular construction readily accessible for maintenance, repair and module replacement from the exterior
of the enclosure. [For units installed outdoors or in corrosive environments, electronic circuits shall be enclosed
in a sealed electronics compartment that is not provided with direct cooling ventilation or forced air cooling.
]Provide permanent identification tags for wiring. Uniquely identify each wire. Use the same identification
system in the wiring diagrams in the Operation and Maintenance Manual. Provide each enclosure with a finish
coat over a substrate which has been provided with a rust inhibiting treatment. [Provide two finish coats for
outdoor enclosures.] Color shall be the manufacturer's standard color.
2.1.14 Nameplates
As specified in Section 26 00 00.00 20 BASIC ELECTRICAL MATERIALS AND METHODS.
[2.2 AIRCRAFT POWER CABLE ASSEMBLY
NOTE: Coordinate cable assembly requirements with unit voltage requirements
and aircraft requirements.
[For 400 Hz wiring at 200Y/115 volts, provide 7-conductor type cable configured as 6 phase conductors (2xA, 2xB,
2xC) tightly wound around the center located neutral, twisted and jacketed in accordance with SAE AS5756/6.][For
400 Hz wiring at 575 volts, 3-phase delta, provide 7-conductor type cable configured as 6 phase conductors (2xA,
2xB, 2xC) tightly wound around the center located ground, twisted and jacketed in accordance with SAE AS5756/6
.] Provide control cabling included within the jacket for interlock circuit and automatic line drop compensation.
Terminate control wiring on accessible terminal blocks in unit. Provide cable assembly with integrally molded
400 Hertz male connector aircraft plug in accordance with MS 25486-17. Cable/connector assembly shall be suitable
for severe duty. Contact terminations shall be crimped.
][2.3 REMOTE MONITORING AND CONTROL PANEL
NOTE: Delete this paragraph unless plans clearly indicate requirement for remote
monitoring and control panel.
Provide remote monitoring and control panel and circuitry. Connect to clearly and permanently labeled terminal
blocks located inside the converter's enclosure. Provide the circuitry such that indicator lamp/LED information
and control function(s) can be extended from the terminals to a remote location in the future.
a. Pushbutton or switch for de-energizing the output terminals.
b. Indicator lamp/LED showing the unit status (energized or not energized).
c. Indicator lamp/LED showing the output circuit breaker position (open or closed).
d. System alarm.
]2.4 SOURCE QUALITY CONTROL
2.4.1 Converter Test Schedule
The Government reserves the right to witness tests. Provide frequency converter test schedule for tests to be
performed at the manufacturer's test facility. Submit required test schedule and location, and notify the Contracting
Officer 30 calendar days before scheduled test date. Notify Contracting Officer 15 calendar days in advance
of changes to scheduled date.
a. Test Instrument Calibration
1. The manufacturer shall have a calibration program which assures that all applicable test
instruments are maintained within rated accuracy.
2. The accuracy shall be directly traceable to the National Institute of Standards and Technology.
3. Instrument calibration frequency schedule shall not exceed 12 months for both test floor
instruments and leased specialty equipment.
4. Dated calibration labels shall be visible on all test equipment.
5. Calibrating standard shall be of higher accuracy than that of the instrument tested.
6. Keep up-to-date records that indicate dates and test results of instruments calibrated or
tested. For instruments calibrated by the manufacturer on a routine basis, in lieu of third
party calibration, include the following:
(a) Maintain up-to-date instrument calibration instructions and procedures for each test instrument.
(b) Identify the third party/laboratory calibrated instrument to verify that calibrating standard
is met.
2.4.2 Routine Factory Tests
NOTE: Coordinate line drop compensation option with power cable assembly requirements.
Routine tests shall be performed by the manufacturer on each of the actual frequency converter(s) prepared for
this project to ensure that the design performance is maintained in production. [As an exception, automatic
line drop compensation shall be tested on only one unit on multiple unit orders.] Submit test reports, by serial
number and receive approval before delivery of equipment to the project site.
For tests which require full load, use 1.0 power factor unless otherwise noted. All measurements shall be true
RMS measurements. Measurements shall be obtained in accordance with IEEE Std 1159. Tests shall include the
following:
a. Input current and power factor: Operate converter at low, nominal and high input voltage
at full load. Measure and record input voltage, input power factor and input current in each
phase [and neutral if the neutral conductor is connected to the converter input.]
b. Output voltage, output voltage THD, output current, output power factor, and voltage regulation:
Operate converter at nominal input voltage for:
1. 50 percent of rated capacity with 0.8 lagging power factor
linear load.
2. 100 percent of rated capacity with 0.5 lagging power factor,
0.8 lagging power factor, 1.0 power factor, and 0.8 leading power factor linear loads.
3. 50 percent of rated capacity with the non-linear load as
specified in the paragraph entitled "Load Range".
4. 100 percent of rated capacity at low and high input voltage.
5. 100 percent of rated capacity with the non-linear load as
specified in the paragraph entitled "Load Range".
Operate for not less than 10 minutes at each test condition in (1), (2), (3) and (4) above and
not less than 30 minutes at test condition in (5) above. Monitor and record output voltage,
output voltage THD, output current, output current waveform, output power factor and frequency
at the beginning and end of each test condition. Monitor and record output voltage single harmonic
distortion for each test condition in (2) and (5) above at the beginning and end of each test
condition. Verify output remains within specified regulation limits.
c. Efficiency: Operate at nominal input voltage at half load and full load at 1.0 power factor.
Measure and record input voltage, input current, input power factor, output voltage, output
current, and output power factor. Calculate the unit efficiency.
d. No load losses: Operate at no load and nominal input voltage. Measure and record input
voltage, input current, input power, input power factor, and output voltage.
e. Burn-in Test: Before delivery, burn-in all units [under full load conditions for at least
[24][_____] hours] [by cycling units [6][_____] hours "ON" under full load conditions and [3][_____]
hours "OFF" at no load conditions for at least [4][_____] complete "ON" cycles.] Burn-in test
shall be performed with the converter enclosure doors closed and all ventilation in the final
operating condition.
f. Include harmonic frequency spectrum analysis depicting Harmonic Order and Harmonic Magnitude
at the unit's input and output terminals during full load THD test in test reports.
g. Automatic line drop compensation: Operate converter at nominal voltage at:
1. No-load.
2. 50 percent of rated capacity with a 0.8 lagging power factor
linear load.
3. 50 percent of rated capacity with the specified non-linear
load.
4. 100 percent of rated capacity with a 0.8 lagging power factor
linear load.
5. 100 percent of rated capacity with the specified non-linear
load.
Loads shall be connected to the converter with the specified aircraft power cable assembly.
No adjustments to the frequency converter shall be allowed between load tests. Monitor and
record output voltage at the load end of the cable. Verify specified performance of the line
drop compensation.
2.4.3 Special Factory Tests (Design Tests)
NOTE: Delete acoustical noise test unless frequency converter is installed
in special locations such as test laboratories or other confined spaces.
Submit special factory test (design test) reports (complete with test data, explanations, formulas, and results),
in the same submittal package as the catalog data and drawings for [each of] the specified frequency converter(s).
Tests shall be certified and signed by a registered professional engineer. Tests shall be on file based on a
production model of converters of the same design, construction and kVA rating provided.
As an option, the manufacturer shall test [one][_____] unit[s] at the same time scheduled for routine tests,
of each rating and size converter to assure compliance with the specification. For all tests which require full
load, use 1.0 power factor unless otherwise noted. The tests shall include the following:
NOTE: Select Location Category C for outdoor locations only.
a. Surge protection: Apply input surges in accordance with IEEE C62.41.1 and C62.41.2, Location
Category [B][C] and monitor output. Conduct a minimum of three consecutive successful tests
on each unit listed. Confirm there is no interruption to 400 Hz output power and voltage stays
within specified regulation tolerances. Surge protection tests shall be applicable on all frequency
converter units utilizing same surge protection device by manufacturer and part number regardless
of frequency converter kVA size.
b. Inrush current: After applying power to the converter, conduct a minimum of three inrush
current tests at full load. Provide copies of waveform and THD analysis in test report.
c. Input current distortion: Operate at nominal input voltage at full load. Measure and record
the input current THD for the current in each phase.
d. Overload/overcurrent: Operate at nominal input voltage with loads listed below:
Percent of Full Load Minimum
Operating Time
110 percent 60 min
125 percent 10 min
150 percent 2 min
200 percent 20 sec
300 percent 6 sec
Monitor output to confirm there is no 400 Hz power interruption. After minimum operating
time is achieved, unit shall interrupt output power.
e. Short-circuit: Apply a [bolted line-to-ground,] bolted line-to-line, and bolted three phase
fault directly to the output terminals of the unit. Conduct a minimum of three consecutive
successful tests on each unit. Provide unit capable of carrying the fault current until the
integral system protective devices interrupts the fault with no damage to the unit. Provide
waveforms of short circuit current during short circuit tests.
f. Output voltage THD: Operate at nominal input voltage at full load with balanced and 15 percent
unbalanced load. A 15 percent unbalanced load is defined as follows:
(1) Phase A at full rated single phase load.
(2) Phase B at 85 percent of Phase A
(3) Phase C at 85 percent of Phase A
Measure and record the output voltage THD for the line-to-neutral voltage of each phase.
g. Phase angle regulation: Operate at full load with balanced and 15 percent unbalanced loads.
Measure and record displacement angle between adjacent output voltage phases. A 15 percent
unbalanced load is defined as follows:
(1) Phase A at full rated single phase load.
(2) Phase B at 85 percent of Phase A.
(3) Phase C at 85 percent of Phase A.
h. Transient recovery: Operate at the following load steps: 0 to 100 percent, 0 to 50 percent,
100 to 0 percent and 50 to 0 percent. Measure and record recovery time and output voltage deviation
limits. Provide recordings or display of output voltage during transient recovery test.
[i. Acoustical noise: Operate at no load, 50 percent and 100 percent of full load. Measure
continuous steady sound pressure level 1525 mm 5 feet horizontally from the center of each side
of the converter at a point 1525 mm 5 feet above the floor. Decibels (dB) are referenced to
20 micropascal.]
[j. Electromagnetic interference (EMI) test: [EMI test shall meet the requirements of MIL-STD-461
, Part 9, for Class C2 equipment.] [Certified test results on units of the same design shall
be acceptable.]]
[k. Paralleling: Operate at nominal input voltage at 50 percent and 100 percent of full load
at 0.8 lagging power factor. Measure and record the output voltage, output current and power
factor provided by each individual unit.]
PART 3 EXECUTION
3.1 INSTALLATION
Install products to operate at 400 Hz in the same manner as specified in other sections of this specification
for products operating at [50] [60] Hz, unless indicated or specified otherwise. Conform to the requirements
of NFPA 70 and IEEE C2 and to manufacturer's instructions and recommendations.
3.1.1 Equipment
3.1.1.1 Floor Mounted
Provide proper floor mounting channels and install in accordance with the manufacturer's drawings and instructions
and as indicated. Align, level, and bolt or weld units to channels to allow easy withdrawal or insertion of removable
components and to permit proper operation and maintenance of equipment.
[3.1.1.2 Wall Mounted
NOTE: Wall mount units 5 kVA or less. All other units shall be floor mounted.
Bracket mount, but otherwise install as required for floor-mounted units.
]3.1.2 Grounding
NOTE: Insert appropriate Section number and title in the blanks below using
format per UFC 1-300-02.
In accordance with NFPA 70 and as specified in [Section 26 20 00 INTERIOR DISTRIBUTION SYSTEM] [_____].
[3.1.3 Wiring and Conduit
NOTE: Conductors, circuit breakers, and devices operating at 400 Hz shall be
derated as follows:
Circuit Breakers
Derating Factor
E Frame (100 A) 0.87
F Frame (225 A) 0.85
J Frame (600 A) 0.82
K Frame (1200 A) 0.74
Cable
AWG Derating Factor
#2 0.9877
#1 0.9675
#1/0 0.9481
#2/0 0.9167
#3/0 0.8831
#4/0 0.8483
3.1.3.1 Building Wiring
NOTE: Insert appropriate Section number and title in the blank below using
format per UFC 1-300-02.
Provide Type XHHW or THHN with stranded copper conductors wiring for 400 Hz circuits. Provide wiring for 400
Hz circuits in non-magnetic conduit, aluminum or PVC. Provide wiring and conduit for 60 Hz circuits as specified
in Section 26 20 00, INTERIOR DISTRIBUTION SYSTEM [_____].
3.1.3.2 Conduit
Use aluminum conduit for exposed feeders. Do not install aluminum conduit underground or encased in concrete.
Use aluminum fittings and boxes with aluminum conduit. For underground or concrete encasement use PVC.
]3.1.4 Manufacturer's Representative
The manufacturer's representative shall place the system in operation and make necessary adjustments to ensure
optimum operation of the equipment. The manufacturer's representative shall have at least 2 years of practical
experience in the installation and testing of 400 Hz solid state frequency converters.
3.2 FIELD QUALITY CONTROL
3.2.1 Instruments
Provide test instruments capable of measuring and recording or displaying test data at a higher resolution and
greater accuracy than specified for the converter's performance. The test instruments used in the field tests
shall have current valid calibration stickers issued by an approved calibration laboratory. Verify calibration
and adjustments of converter instruments provided prior to field tests. Instruments shall be calibrated for
400 Hz operation when measuring 400 Hz signals.
3.2.2 Performance of Acceptance Checks and Tests
Perform field tests and conduct inspections. Provide labor, equipment tests instruments, and incidentals required
for the tests including load banks, except the Government will furnish electricity. For all electrical load
tests, use 1.0 power factor.
Perform in accordance with the manufacturer's recommendations and include the following visual and mechanical
inspections and electrical tests.
3.2.3 Initial Inspection and Tests
a. Compare equipment nameplate information with specifications and
approved shop drawings.
b. Inspect physical and mechanical condition.
c. Inspect all bolted electrical connections for high resistance using
low-resistance ohmmeter, verifying tightness of accessible bolted
electrical connections by calibrated torque-wrench method, or
performing thermographic survey.
d. Perform specific inspections and mechanical tests as recommended by
manufacturer.
e. Verify correct equipment grounding.
f. Perform resistance measurements through all bolted connections with
low-resistance ohmmeter, if applicable.
3.2.4 Performance Tests
Conduct converter performance tests under the supervision of the manufacturer's representative. Successfully
complete the preliminary operation, control and protective devices check prior to performing load and transient
tests. If the converter fails to operate within the specified limits during any of the performance tests the
Contractor shall discontinue the test and shall make necessary repairs to correct the failure and restart testing
of the converter.
3.2.4.1 Preliminary Operation
Inspect the converter and make adjustments necessary to assure proper operation in accordance with the manufacturer's
instructions. Operate frequency converter at 0, 25, 50, 75, and 100 percent of rated full load. Measure and
record the output voltage, current, frequency, and THD at each load. Calculate output voltage regulation. Verify
converter is operating within specified limits at each load level.
3.2.4.2 Control and Protective Device Checks
Operate each control, switch, input/output device that is capable of being operated manually a minimum of three
times, demonstrating satisfactory operation each time. Perform operation test on each protective device to ensure
that devices functions properly. After each operation measure and record the converter output frequency, voltage
and current. Verify converter is operating within specified limits.
3.2.4.3 Load Test
NOTE: Delete bracketed option only when the frequency converter will not be
connected to aircraft cable assembly when in service.
Operate each unit continuously a minimum of 2 hours at 100 percent rated load. Measure and record the converter
output frequency, voltage and current. Verify converter is operating within specified limits. Load test shall
be performed with the converter doors closed[ and the load connected to the converter with specified aircraft
cable assembly].
3.2.4.4 Transient Tests
Transient recovery: Operate at the following load steps: 0 to 100 percent, 0 to 50 percent, 100 to 0 percent,
and 50 to 0 percent. Provide recordings or displays of voltage and frequency during each transient test, and
indicate on the recordings and displays the time intervals and acceptable limits for voltage and frequency.
Repeat each transient test three times, record the results of each test. Verify converter is operating within
specified limits.
3.2.4.5 Harmonic Distortion Tests
Perform output voltage harmonic distortion tests at the output of the converter terminals at 0% load and 100%
load at unity power factor. The Contractor shall provide test equipment and instrumentation required for the
tests. Tests shall be conducted with a distortion analyzer with test leads within 3 feet of the frequency converter's
output terminals. Test data shall include total harmonic distortion amplitudes of all individual harmonics presented
in a spectrum analysis format up to the 37th order.
3.2.4.6 Automatic Line Drop Compensation
Conduct automatic line drop compensation tests on each converter with the load connected to the converter with
the specified aircraft power cable assembly. Operate each converter at no load, 50 percent and 100 percent of
the rated capacity. No adjustments to the frequency converter shall be allowed between load tests. Monitor
and record output voltage at the load end of the cable. Verify specified performance of the line drop compensation.
3.2.5 Grounding System
Inspect ground system for compliance with contract plans and specifications.
3.2.6 Follow-up Verification
Upon completion of acceptance checks and tests, the Contractor shall show by demonstration in service that circuits
and devices are in good operating condition and properly performing the intended function. As an exception to
requirements stated elsewhere in the contract, the Contracting Officer shall be given 5 working days advance
notice of the dates and times of checking and testing.
3.3 DEMONSTRATION
3.3.1 Instructing Government Personnel
Provide field training to Government personnel on the operation and maintenance of the converter provided. Provide
field training 2 weeks prior to the scheduled date for field acceptance tests. As a minimum the training shall
include [2][_____] hours of instruction on the theory of operation and [4][_____] hours on the repair and maintenance
of the converters. The instructor shall be approved by the manufacturer of the unit provided. Submit training
syllabus including each topic of training and a brief outline of each topic to the Contracting Officer at least
4 weeks prior to training for approval. Training shall be approved by the Contracting Officer at least 2 weeks
in advance. The Government may record, video and audio, the training sessions and use these recordings to train
personnel on the operation and maintenance of the converter system. Provide two copies of video or audio tapes,
if used in the training sessions, to the Contracting Officer.
NOTE: Suggestions for improvement of this specification will be welcomed using
the Navy "Change Request Forms" subdirectory located in SPECSINTACT in Jobs
or Masters under "Forms/Documents" directory, using the electronic Criteria
Change Request found at the DoD page of the Whole Building Design Guide (http://dod.wbdg.org)
or DD Form 1426. Suggestions should be forwarded to:
Commander
Naval Facilities Engineering Command
NAVFAC Criteria Office
6506 Hampton Blvd
Norfolk, VA 23508-1278
FAX: (757) 322-4416 or DSN 262-4416