SOW Attachment 1- UFGS 26 35 43.pdf

USACE / NAVFAC / AFCEC / NASA UFGS- 26 35 43 ( May 2011) Change 2 - 02/ 18 Pr epar i ng Act i v i t y: NAVFAC Super sedi ng UFGS- 26 35 43 ( Apr i l 2006)

UNI FI ED FACI LI TI ES GUI DE SPECI FI CATI ONS

Ref er ences ar e i n agr eement wi t h UMRL dat ed Januar y 2020

SECTION TABLE OF CONTENTS

DIVISION 26 - ELECTRICAL

SECTION 26 35 43

400-HERTZ (HZ) SOLID STATE FREQUENCY CONVERTER

05/11

PART 1 GENERAL

1.1 REFERENCES

1.2 GENERAL REQUIREMENTS

1.3 SUBMITTALS

1.4 QUALITY ASSURANCE

1.4.1 Frequency Converter Drawings

1.4.2 Qualifications of Manufacturer

1.4.3 Work Plan

1.4.4 Routine Factory Test Plan

1.4.5 Special Factory Test Plan

1.4.6 Performance Test Plan

1.4.7 UL Listing

1.4.7.1 Currently Listed Products

1.4.7.2 Proposed Listed Products

1.4.8 Routine Factory Tests Report

1.4.9 Special Factory Tests Report

1.4.10 Performance Tests Report

1.5 MAINTENANCE

1.5.1 Operation and Maintenance Manuals

1.5.1.1 Additions to Operation and Maintenance Manuals

1.5.1.2 Preliminary Operation and Maintenance Manuals

1.5.1.3 Extra Material

PART 2 PRODUCTS

2.1 FREQUENCY CONVERTER

2.1.1 Electrical Characteristics

2.1.1.1 Input Voltage

2.1.1.2 Input Power Factor

2.1.1.3 Surge Protection

2.1.1.4 Inrush Current

2.1.1.5 Input Current Distortion

2.1.1.6 Output Voltage

2.1.1.7 Power Output

SECTION 26 35 43 Page 1

2.1.1.8 Load Range

2.1.1.9 Efficiency

2.1.1.10 No Load Input Losses

2.1.1.11 Overload

2.1.1.12 Short Circuit

2.1.1.13 Output Voltage THD

2.1.1.14 Output Voltage Amplitude Modulation

2.1.1.15 Frequency Stability

2.1.1.16 Phase Angle Regulation

2.1.1.17 Transient Output Voltage Recovery

2.1.2 Environmental Rating

2.1.3 Monitoring and Control Panel

2.1.3.1 Controls

2.1.3.2 Indicators

2.1.3.3 Digital Instrumentation

2.1.3.4 Alarm Annunciator

2.1.4 Input/Output Devices

2.1.4.1 Circuit Breaker

2.1.4.2 Input Circuit Breaker

2.1.4.3 Output Contactor

2.1.4.4 Output Circuit Breaker

2.1.4.5 Aircraft Interlock Circuit

2.1.5 Protective Controls

2.1.6 Electromagnetic Interference Limits

2.1.7 Automatic Line Drop Compensation

2.1.8 Paralleling

2.1.9 Auto Restart

2.1.10 Built-In Test Equipment

2.1.11 Magnetic Devices

2.1.12 Acoustical Noise

2.1.13 Assembly Construction

2.1.14 Nameplates

2.2 AIRCRAFT POWER CABLE ASSEMBLY

2.3 REMOTE MONITORING AND CONTROL PANEL

2.4 SOURCE QUALITY CONTROL

2.4.1 Converter Test Schedule

2.4.2 Routine Factory Tests

2.4.3 Special Factory Tests (Design Tests)

PART 3 EXECUTION

3.1 INSTALLATION

3.1.1 Equipment

3.1.1.1 Floor Mounted

3.1.1.2 Wall Mounted

3.1.2 Grounding

3.1.3 Wiring and Conduit

3.1.3.1 Building Wiring

3.1.3.2 Conduit

3.1.4 Manufacturer's Representative

3.2 FIELD QUALITY CONTROL

3.2.1 Instruments

3.2.2 Performance of Acceptance Checks and Tests

3.2.3 Initial Inspection and Tests

3.2.4 Performance Tests

3.2.4.1 Preliminary Operation

3.2.4.2 Control and Protective Device Checks

3.2.4.3 Load Test

3.2.4.4 Transient Tests

SECTION 26 35 43 Page 2

3.2.4.5 Harmonic Distortion Tests

3.2.4.6 Automatic Line Drop Compensation

3.2.5 Grounding System

3.2.6 Follow-up Verification

3.3 DEMONSTRATION

3.3.1 Instructing Government Personnel

-- End of Section Table of Contents --

SECTION 26 35 43 Page 3

USACE / NAVFAC / AFCEC / NASA UFGS- 26 35 43 ( May 2011) Change 2 - 02/ 18 Pr epar i ng Act i v i t y: NAVFAC Super sedi ng UFGS- 26 35 43 ( Apr i l 2006)

UNI FI ED FACI LI TI ES GUI DE SPECI FI CATI ONS

Ref er ences ar e i n agr eement wi t h UMRL dat ed Januar y 2020

SECTION 26 35 43

400-HERTZ (HZ) SOLID STATE FREQUENCY CONVERTER

05/11

NOTE: Thi s gui de speci f i cat i on cover s t he r equi r ement s f or t he pr ocur ement , i nst al l at i on, and t est i ng of 400 Hz sol i d st at e f r equency conver t er s.

Adher e t o UFC 1-300-02 Uni f i ed Faci l i t i es Gui de Speci f i cat i ons ( UFGS) For mat St andar d when edi t i ng t hi s gui de speci f i cat i on or pr epar i ng new pr oj ect speci f i cat i on sect i ons. Edi t t hi s gui de speci f i cat i on f or pr oj ect speci f i c r equi r ement s by addi ng, del et i ng, or r evi s i ng t ext . For br acket ed i t ems, choose appl i cabl e i t em( s) or i nser t appr opr i at e i nf or mat i on.

Remove i nf or mat i on and r equi r ement s not r equi r ed i n r espect i ve pr oj ect , whet her or not br acket s ar e present.

Comment s, suggest i ons and r ecommended changes f or t hi s gui de speci f i cat i on ar e wel come and shoul d be submi t t ed as a Criteria Change Request (CCR) .

NOTE: These conver t er s ar e used t o suppl y 400 Hz el ect r i cal power t o ai r cr af t and shi ps i n shor e f aci l i t y envi r onment s. Typi cal appl i cat i ons i ncl ude ai r cr af t oper at i ng i n f l i ght l i ne condi t i ons or i n hangar s, avi oni cs shops, l abor at or i es, t r ai ni ng bui l di ngs, f l i ght s i mul at or s, and comput er r ooms.

Thi s speci f i cat i on i s not t o be used f or pr ocur ement of power conver t er s i nst al l ed on boar d ai r cr af t or shi ps. Thi s speci f i cat i on i s not i nt ended f or medi um- vol t age appl i cat i ons.

NOTE: The f ol l owi ng i nf or mat i on shal l be shown on t he pr oj ect dr awi ngs:

1. Show l ocat i on of al l equi pment i ncl udi ng

SECTION 26 35 43 Page 4 conver t er , par al l el i ng panel s, r emot e moni t or i ng and cont r ol panel .

2. Pr ovi de f unct i onal bl ock di agr am, s i ngl e l i ne di agr ams, power , and cont r ol wi r i ng i nt er connect i on di agr ams, wi r i ng di agr ams, condui t ent r y di agr ams, equi pment el evat i ons, l i mi t i ng di mensi ons, and equi pment r at i ngs whi ch ar e not cover ed i n t he specifications.

3. Desi gn 400 Hz equi pment r ooms wi t h wor ki ng spaces as r equi r ed by NFPA 70. Pr ovi de vent i l at i on f or equi pment r ooms based on 400 Hz component s heat l oad gener at ed when oper at i ng at 100 per cent l oad.

Pr ovi de 60 Hz conveni ence r ecept acl es.

NOTE: Ensur e t hat t he 400 Hz di st r i but i on syst em i s pr oper l y coor di nat ed i ncl udi ng t he r at i ngs of t he power cabl es, gr ound cabl es, c i r cui t br eaker s, t r ansf or mer s, f i l t er s, r ect i f i er s, and cont r ol equi pment . When r epl aci ng a mot or gener at or set wi t h a sol i d st at e conver t er ensur e t hat t he exi st i ng f eeder s c i r cui t pr ot ect i ve devi ces wi l l oper at e pr oper l y wi t hout damage t o el ect r i cal devi ces i ncl udi ng t he sol i d st at e conver t er .

PART 1 GENERAL

1.1 REFERENCES

NOTE: Thi s par agr aph i s used t o l i s t t he publ i cat i ons c i t ed i n t he t ext of t he gui de speci f i cat i on. The publ i cat i ons ar e r ef er r ed t o i n t he t ext by basi c desi gnat i on onl y and l i s t ed i n t hi s par agr aph by or gani zat i on, desi gnat i on, dat e, and t i t l e.

Use t he Ref er ence Wi zar d' s Check Ref er ence f eat ur e when you add a Ref er ence I dent i f i er ( RI D) out si de of t he Sect i on' s Ref er ence Ar t i c l e t o aut omat i cal l y pl ace t he r ef er ence i n t he Ref er ence Ar t i c l e. Al so use t he Ref er ence Wi zar d' s Check Ref er ence f eat ur e t o updat e t he i ssue dat es.

Ref er ences not used i n t he t ext wi l l aut omat i cal l y be del et ed f r om t hi s sect i on of t he pr oj ect speci f i cat i on when you choose t o r econci l e r ef er ences i n t he publ i sh pr i nt pr ocess.

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.

SECTION 26 35 43 Page 5

INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS (IEEE)

IEEE 519 (2014) Recommended Practices and Requirements for Harmonic Control in Electrical Power Systems

IEEE 1159 (2009) Recommended Practice on Monitoring Electric Power Quality

IEEE C2 (2017; Errata 1-2 2017; INT 1 2017) National Electrical Safety Code

IEEE C62.41.1 (2002; R 2008) Guide on the Surges Environment in Low-Voltage (1000 V and Less) AC Power Circuits

IEEE C62.41.2 (2002) Recommended Practice on Characterization of Surges in Low-Voltage (1000 V and Less) AC Power Circuits

INTERNATIONAL ELECTROTECHNICAL COMMISSION (IEC)

IEC 60947-4-1 (2012; ED 3.1) Low-voltage Switchgear and Controlgear, Part 4-1: Contactors and Motor Starters - Electromechanical Contactor and Motor Starters

NATIONAL ELECTRICAL MANUFACTURERS ASSOCIATION (NEMA)

NEMA 250 (2018) Enclosures for Electrical Equipment (1000 Volts Maximum)

NEMA ST 20 (2014) Dry-Type Transformers for General Applications

NATIONAL FIRE PROTECTION ASSOCIATION (NFPA)

NFPA 70 (2017; ERTA 1-2 2017; TIA 17-1; TIA 17-2;

TIA 17-3; TIA 17-4; TIA 17-5; TIA 17-6;

TIA 17-7; TIA 17-8; TIA 17-9; TIA 17-10;

TIA 17-11; TIA 17-12; TIA 17-13; TIA

17-14; TIA 17-15; TIA 17-16; TIA 17-17 )

National Electrical Code

SOCIETY OF AUTOMOTIVE ENGINEERS INTERNATIONAL (SAE)

SAE AS5756/6 (2013; Rev A; Stabilized (S) 2013) Cable, 3-Phase Power, Electric Portable, Multiconductor, 90 Degree C, 600V, Ozone Resistant, Split Phase

U.S. DEPARTMENT OF DEFENSE (DOD)

MIL-PRF-24021 (1998; Rev K; Notice 1 2014) Electric Power Monitors, External Aircraft

MIL-STD-461 (2015; Rev G) Requirements for the Control of Electromagnetic Interference Characteristics of Subsystems and Equipment

SECTION 26 35 43 Page 6

MIL-STD-704 (2004; Rev F; Notice 1 2008; Notice 2 2013) Aircraft Electric Power Characteristics

MIL-STD-1399-300 (2008; Rev B) Electric Power, Alternating Current

UNDERWRITERS LABORATORIES (UL)

UL 489 (2016) UL Standard for Safety Molded-Case Circuit Breakers, Molded-Case Switches and Circuit-Breaker Enclosures

UL 506 (2017) UL Standard for Safety Specialty Transformers

UL 1012 (2010; Reprint Apr 2016) UL Standard for Safety Power Units Other than Class 2

UL 1449 (2014; Reprint Jul 2017) UL Standard for Safety Surge Protective Devices

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: Revi ew Submi t t al Descr i pt i on ( SD) def i ni t i ons i n Sect i on 01 33 00 SUBMI TTAL PROCEDURES and edi t t he f ol l owi ng l i s t t o r ef l ect onl y t he submi t t al s r equi r ed f or t he pr oj ect .

The Gui de Speci f i cat i on t echni cal edi t or s have desi gnat ed t hose i t ems t hat r equi r e Gover nment appr oval , due t o t hei r compl exi t y or cr i t i cal i t y, wi t h a " G. " Gener al l y, ot her submi t t al i t ems can be r evi ewed by t he Cont r act or ' s Qual i t y Cont r ol Syst em. Onl y add a " G" t o an i t em, i f t he submi t t al i s suf f i c i ent l y i mpor t ant or compl ex i n cont ext of t he pr oj ect .

For submi t t al s r equi r i ng Gover nment appr oval on Ar my pr oj ect s, a code of up t o t hr ee char act er s wi t hi n t he submi t t al t ags may be used f ol l owi ng t he " G" desi gnat i on t o i ndi cat e t he appr ovi ng aut hor i t y.

Codes f or Ar my pr oj ect s usi ng t he Resi dent Management Syst em ( RMS) ar e: " AE" f or Ar chi t ect - Engi neer ; " DO" f or Di st r i ct Of f i ce ( Engi neer i ng Di v i s i on or ot her or gani zat i on i n t he Di st r i ct Of f i ce) ; " AO" f or Ar ea Of f i ce; " RO" f or Resi dent Of f i ce; and " PO" f or Pr oj ect Of f i ce. Codes f ol l owi ng t he " G" t ypi cal l y ar e not used f or Navy, Ai r For ce, and NASA pr oj ect s.

The " S" f ol l owi ng a submi t t al i t em i ndi cat es t hat

SECTION 26 35 43 Page 7 t he submi t t al i s r equi r ed f or t he Sust ai nabi l i t y eNot ebook t o f ul f i l l f eder al l y mandat ed sust ai nabl e r equi r ement s i n accor dance wi t h Sect i on 01 33 29 SUSTAI NABI LI TY REPORTI NG. Locat e t he " S" submi t t al under t he SD number t hat best descr i bes t he submi t t al i t em.

Choose t he f i r st br acket ed i t em f or Navy, Ai r For ce and NASA pr oj ect s, or choose t he second br acket ed i t em f or Ar my pr oj ect s.

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.] Submittals with an "S" are for inclusion in the Sustainability eNotebook, in conformance with Section 01 33 29 SUSTAINABILITY REPORTING. Submit the following in accordance with Section

01 33 00 SUBMITTAL PROCEDURES:

SD-02 Shop Drawings

Frequency Converter Drawings ; G[, [_____]]

SD-03 Product Data

Frequency Converter ; G[, [_____]]

Aircraft Power Cable Assembly ; G[, [_____]]

[ Remote Monitoring and Control Panel ; G[, [_____]] ]

SD-06 Test Reports

Work Plan ; G[, [_____]]

Routine Factory Test Plan ; G[, [_____]]

Special Factory Test Plan ; G[, [_____]]

Performance Test Plan ; G[, [_____]]

Test Schedule ; G[, [_____]]

Routine Factory Tests ; G[, [_____]]

Special Factory Tests ; G[, [_____]]

SD-07 Certificates

Qualifications of Manufacturer ; G[, [_____]]

UL Listing ; G[, [_____]]

SD-09 Manufacturer's Field Reports

Initial Inspection and Tests ; G[, [_____]]

SECTION 26 35 43 Page 8

Performance Tests ; G[, [_____]]

Training Syllabus ; G[, [_____]]

SD-10 Operation and Maintenance Data

Frequency Converter , Data Package 5; G[, [_____]]

Preliminary Operation and Maintenance Manuals , Data Package 5; G[, Remote Monitoring and Control Panel , Data Package 5; 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 exper i ence cl ause i n t hi s sect i on has been appr oved by a Level I Cont r act i ng Of f i cer i n accor dance wi t h t he r equi r ement s of Naval Faci l i t i es Acqui s i t i on Suppl ement ( NFAS) . NFAS can be f ound a t he f ol l owi ng l i nk:

ht t ps: / / por t al . navf ac. navy. mi l / por t al / page/ por t al / navf ac/ navf ac_f or busi nesses_pp/ smal l busi ness/ cont r act i ng/ navf ac Thi s c l ause may be used wi t hout f ur t her appr oval or r equest f or wai ver .

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.

SECTION 26 35 43 Page 9

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 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 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 FIELD QUALITY CONTROL. Test reports shall include power quality measurement data collected in accordance with

IEEE 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.

SECTION 26 35 43 Page 10

Receive approval of test prior to shipping unit. Certify tests were conducted on each converter in accordance with the requirements set forth in paragraph 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 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 FIELD QUALITY CONTROL within [15][_____] calendar days after completion of tests.

Certify tests were conducted on each converter in accordance with the paragraph 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: Del et e vent i l at i on syst em f i l t er s except f or f r equency conver t er s l ocat ed out door s or i n ar eas subj ect t o a hi gh l evel of ai r bor ne cont ami nant s.

SECTION 26 35 43 Page 11

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 edi t t hi s par agr aph t o speci f y t he t ype of power suppl y, r ect i f i er t ype or swi t chi ng t echnol ogy t o be ut i l i zed. Speci f y i ng t hi s t ype of t echnol ogy may make t hi s a sol e sour ce speci f i cat i on whi ch r equi r es j ust i f i cat i on and appr oval per f eder al cont r act l aw.

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. 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 uni t s 15 kVA and bel ow t he i nput vol t age shoul d be 208 vol t s and f or uni t s over 15 kVA t he pr ef er r ed i nput vol t age i s 480 vol t s. Usi ng i nput vol t age ot her t han 480 vol t s wi l l i ncr ease t he cost and wei ght and decr ease t he ef f i c i ency of t he

SECTION 26 35 43 Page 12 conver t er . The i nput vol t age shal l be shown on t he const r uct i on dr awi ngs.

[480Y/277][208Y/120][380Y/220][_____] 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: Sel ect Locat i on Cat egor y C f or out door l ocat i ons onl y.

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: Wher e t ot al connect ed f r equency conver t er l oad i s a smal l per cent age ( l ess t han 40 per cent ) of t he t ot al connect ed f aci l i t y l oad, use 12 per cent THD and 8 per cent i ndi v i dual . For l ar ge f r equency conver t er s ( i . e. 312 kVA or l ar ger ) or wher e t ot al connect ed f r equency conver t er l oad i s a s i gni f i cant per cent age of t he t ot al connect ed f aci l i t y l oad, use 5 per cent THD and 3 per cent i ndi v i dual . For i nst al l at i on i n shi pboar d envi r onment s, use 5 per cent THD and 3 per cent i ndi v i dual .

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

SECTION 26 35 43 Page 13

NOTE: Use MI L- STD- 704, when 400 Hz power i s r equi r ed t o power ai r cr af t avi oni c equi pment .

Ai r cr af t equi pment i s nor mal l y oper at ed 200Y/ 115 V, t hr ee- phase, 400 Hz, gr ounded. UFC 3- 555- 01N, " 400 Her t z Medi um Vol t age Conver si on/ Di st r i but i on and Low Vol t age Ut i l i zat i on Syst ems" cont ai ns ai r cr af t el ect r i cal demand l oads.

Use MI L- STD- 1399- 300, when 400 Hz power i s r equi r ed t o power l abor at or y t est benches si mul at i ng shi pboar d envi r onment s. Shi pboar d equi pment i n s i mul at ed shor e l abor at or y envi r onment s nor mal l y oper at ed on a 440 V, t hr ee- phase, 400 Hz, ungr ounded 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: Uni t t hat wi l l be used f or pr ovi di ng power f or ai r cr af t shoul d be si zed f or t he t ype and number of ai r cr af t t o be suppl i ed. The r ecommended si zes f or uni t s suppor t i ng ai r cr af t ar e 45, 60, 90, 120, 150, 180 or 312 kVA f or l egacy syst ems.

[_____] 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 percent current THD, composed of not less than 6 percent of the 3rd harmonic and not less than 7 percent of the 5th harmonic.

2.1.1.9 Efficiency

NOTE: Use t he t abl e bel ow t o f i l l i n t he kVA and mi ni mum ef f i c i ency.

Mi ni mum Per cent Ef f i c i ency

Rat i ng ( kVA) 50 Per cent Load 100 Per cent Load

5 - 14 80 90

SECTION 26 35 43 Page 14

Mi ni mum Per cent Ef f i c i ency

Rat i ng ( kVA) 50 Per cent Load 100 Per cent Load

15 - 39 86 90

40 - 99 87 91

100 - up 89 92

Addi ng EMI f i l t er i ng f or uni t s wi t h power r at i ng l ar ger t han 15 kVA, wi l l r educe t he ef f i c i ency of t he uni t . I f EMI f i l t er i ng i s speci f i ed f or uni t s wi t h power r at i ng l ar ger t han 15 kVA, r educe mi ni mum ef f i c i ency by 2 per cent .

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 percent.

2.1.1.10 No Load Input Losses

NOTE: Above 30 kVA, use 7 per cent , bel ow 30 kVA, use 9 per cent .

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 percent.

2.1.1.11 Overload

Satisfactory overload 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

After minimum operating time is achieved, unit shall interrupt output power. Unit shall be capable of sustaining the overload without damage until the protective device interrupts the overload.

SECTION 26 35 43 Page 15

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

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 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 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 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

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

SECTION 26 35 43 Page 16

NOTE: Use MI L- STD- 704, when 400 Hz power i s r equi r ed t o power ai r cr af t avi oni c equi pment .

Use MI L- STD- 1399- 300, when 400 Hz power i s r equi r ed t o power shi pboar d equi pment .

[In accordance with MIL-STD-704 .][In accordance with MIL-STD-1399-300 for Type [II][III] power.]

2.1.2 Environmental Rating

NOTE: Sel ect 55 degr ees C ambi ent t emper at ur e r at i ng unl ess i n ar eas subj ect t o ext r eme t emper at ur es ( i . e. Mi ddl e East , deser t envi r onment s, etc.)

The converter shall operate from no load to rated full load under the following conditions:

a. Ambient temperatures ranging from 0 degrees C to [55][60][65] 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 reset.

d. Emergency power off - A separate pushbutton for emergency power off.

[ e. Circuit breaker.

][ f. Output contactor ON/OFF

][ g. 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

SECTION 26 35 43 Page 17 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 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. Elapsed time meter (hours)

[ 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: For del t a out put f r equency conver t er s, del et e phase- t o- neut r al vol t age and neut r al cur r ent di spl ay requirements.

Provide true rms, plus/minus one percent accuracy, microprocessor-based meter with a simultaneous three-line LCD display

Provide a digital display that has, at a minimum, the following functions:

a. Output phase-to-phase voltage.

b. Output phase-to-neutral voltage.

c. Output phase current.

d. Output neutral current.

e. Output frequency.

2.1.3.4 Alarm Annunciator

The unit shall be capable of detecting and displaying the following abnormal conditions:

a. Input overvoltage.

b. Input undervoltage.

c. Output undervoltage.

d. Output overvoltage.

e. Output overload.

f. System alarm.

g. Control logic failure.

SECTION 26 35 43 Page 18

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 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 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 out put c i r cui t br eaker onl y i f f r equency conver t er i s suppl y i ng downst r eam di st r i but i on panel boar d or mul t i pl e out put s wi t h di st r i but i on i nt er nal t o t he f r equency conver t er .

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 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: Coor di nat e wi t h speci f i ed ai r cr af t cabl e 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

SECTION 26 35 43 Page 19 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: Thi s i s an addi t i onal cost i t em and r educes conver t er ef f i c i ency. EMI f i l t er i ng shoul d not be speci f i ed unl ess speci f i cal l y r equest ed by t he user .

Comply with MIL-STD-461 for Class A equipment.

SECTION 26 35 43 Page 20

] 2.1.7 Automatic Line Drop Compensation

Provide automatic line drop compensation - 0 to 7 percent adjustable internally.

[ 2.1.8 Paralleling

NOTE: Thi s i s an addi t i onal cost i t em and shoul d not be speci f i ed unl ess speci f i cal l y r equest ed by t he 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: Aut o r est ar t shoul d be consi der ed when t he conver t er i s i nst al l ed i n a r emot e l ocat i on t hat i s not r eadi l y accessi bl e t o oper at i ng per sonnel and mai nt ai ni ng 400 Hz power i s cr i t i cal t o oper at i ons. Use of aut o r est ar t shoul d be st udi ed car ef ul l y t o ensur e t hat i t does not cr eat e a pot ent i al per sonnel saf et y hazar d. Thi s i s an addi t i onal cost i t em and shoul d not be speci f i ed unl ess speci f i cal l y r equest ed by t he 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.

SECTION 26 35 43 Page 21

] 2.1.12 Acoustical Noise

NOTE: The f ol l owi ng t abl e ser ves as a gui de f or est abl i shi ng t he maxi mum al l owabl e sound pr essur e l evel f or each kVA r at i ng. The desi gner shoul d t ake i nt o consi der at i on t hat conver t er s ar e i nher ent l y noi sy when l ocat i ng t he uni t . Do not modi f y t hese val ues unl ess r equi r ed by t he l ocat i on of t he f r equency conver t er and new val ues have been conf i r med by manuf act ur er as at t ai nabl e. I f val ues di f f er ent t han shown bel ow ar e used, i ncl ude acoust i cal noi se t est i n Speci al Fact or y Test s.

Maxi mum Al l owabl e

Rat i ng ( kVA) Acoust i cal Noi se (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: Del et e " l ouver s" when speci f y i ng NEMA Type 4X and 12K encl osur es.

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

SECTION 26 35 43 Page 22 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: Coor di nat e cabl e assembl y r equi r ement s wi t h uni t vol t age r equi r ement s and ai r cr af t r equi r ement s. Pr ovi de 300 amper e cabl e f or conver t er s 90 kVA and above. Pr ovi de 260 amper es cabl e f or conver t er s smal l er t han 90 kVA.

[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 rated for [300] [260] amperes.][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 .] Cable length must be[27 meters][_____] [90 feet][_____] . 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: Del et e t hi s par agr aph unl ess pl ans cl ear l y i ndi cat e r equi r ement f or r emot e moni t or i ng and cont r ol 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.

SECTION 26 35 43 Page 23

] 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.

Test Instrument Calibration.

a. The manufacturer shall have a calibration program which assures that all applicable test instruments are maintained within rated accuracy.

b. The accuracy shall be directly traceable to the National Institute of Standards and Technology.

c. Instrument calibration frequency schedule shall not exceed 12 months for both test floor instruments and leased specialty equipment.

d. Dated calibration labels shall be visible on all test equipment.

e. Calibrating standard shall be of higher accuracy than that of the instrument tested.

f. 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:

(1) Maintain up-to-date instrument calibration instructions and procedures for each test instrument.

(2) Identify the third party/laboratory calibrated instrument to verify that calibrating standard is met.

2.4.2 Routine Factory Tests

NOTE: Coor di nat e l i ne dr op compensat i on opt i on wi t h power cabl e assembl y r equi r ement s.

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 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, SECTION 26 35 43 Page 24 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 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 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.

SECTION 26 35 43 Page 25

(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: Del et e acoust i cal noi se t est unl ess f r equency conver t er i s i nst al l ed i n speci al l ocat i ons such as t est l abor at or i es or ot her conf i ned 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.