NAVY MIL-C-28794-1973 CABINET ELECTRIC EQUIPMENT (SINGLE BAY)《电气设备箱(单架)》.pdf

1、1-11 LI TARY SPEC I FI CAT ION CABINET, ELECTRONIC EQUIPMENT (SINGLE BAY) 7. -SCOPE This specification covers the functional requirements of a single l*l “6e“ ay electronic equipment cabinet to house electronic equipment in a shipboard environment. 2. APPLICABLE DOCUMEtTS I 2.1 The following documen

2、ts of the issue in effect on date of invita- tion for bids or request for proposal, form a part of the specification to the extent specified herein, SPEC IF ICAT I ONS FEDERAL TT-C -490 TT-P-664 MI LITARY MI L-S -901 FlIL-L-3661/21 MIL-L-3667 138 M IL -c - 5 54 1 MIL -P-8585 fitIL-P-15O24 hl1 L-E-15

3、090 MIL-P-15328 - Cleaning Methods and Pretreatment of - Primer Coating, Synthetic, Rust- Ferrous Surfaces for Organic Coatings. I nhi bi ti ng , Lacquer-Resi s ti ng . - Shock Tests , H. I. (Hi gh-Impact) ; Shipboard Machinery, Equi pment and Systems, Requirements for - Lenses, Indicator-Light, Dri

4、pproof, Style LC21. - Housings , Indi cator-Li ght, Style LH80 - Chemical Films and Chemical Film Materi als for Al umi num and Al uminmum Al 1 oys - Primer Coating, Zinc Chromate, Low Hoi s ture-sensi ti vi ty - Plates , Tags and Bands for Identification of Equipment - Enamel , Equipment, Light-Gra

5、y (Formula No. 111) - Primer (Wash) , Pretreatment, Blue (Formula No: 117-B for Metals) FSC 5975 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-28774 57 m 7779706 0052872 7 m MIL-E-16400 F.1 I L -F-l6 552 Y I L 41 - 1 6 8 78/4 MIL-E-1 7362 MIL

6、-F-l9207/2O NIL-B-23071/9 MIL-I -45208 MIL-T-55164/9 STANDARDS FEDERAL FED-STD-151 MILITARY MIL -STD-108 MIL -STD-16 7 MI L-STD-454 MI L-STD-461 MI t-STD-462 !I IL -S TD -74 O MS24525 DRAWINGS MIL I TARY RE-F2681322 RE-F2683864 - Electronic Equipment, Naval Ship and Shore: General Specification - Fi

7、 1 ter, Air Environmental Control System, Cleanable, Impingement (High Velocity - Wire Electrical, Type E, 200 C. and 260 C., 600 Volts (Insulated, High Temper a tu re) - Electronic Repair Parts Requirements, Procedures for Provisioning Technical Documentation and Stock Humbering - Fuseholders, Extr

8、actor Post Type, Non- i ndicati ng , Types FHN31 G1 and FHN3162. - Blowers, Miniature, for Cooling Electronic Equipment Centrifugal (138 Watts Input Power) - Inspection System REquirementc - Terminal Board, Volded, Barrier, Stud Type, Class 3TB Type) - Vletal, Test tlethodc - Definitions of and Basi

9、c Requirements for Enclosures for Electric and Elect- tronic Eauipment - Mechanical Vibrations of Shipboard Equipment - Standard General Requirements for Electronic Equipment - Electromagnetic Interference Character- istics, Requirements for Equipment - E 1 ec t roma gne t i c I n t er f erence Char

10、acter - i s ti cs, Measurement of - Airborne and Structureborne Noise rleasure- ments and Acceptance Criteria of Ship- board Equipment - Switch, Toggle, Four Pole, Environmentally Sealed - Cabinet, Electronic Equipment CY-4516 - Glower Rack and Front Panel 2 Provided by IHSNot for ResaleNo reproduct

11、ion or networking permitted without license from IHS-,-,-r MIL-C-ZB774 57 7777706 0052873 O W MIL-C-28794( EC) (Copies of specifications, standards, drawings, and publications re- quired by suppliers in connection with specific procurement functions should be obtained from the procuring activity or

12、as directed by the contracting officer . ) 2.2 Other publications. The following documents fom a part of this specification to the extent specified herein. Unless Otherwise indicated, the issue in effect on date.of invitaiton for bids or request for proposal shall apply. AIR HQVING AND CONDITIONING

13、ASSOCIATION INC. (AMCA) Bulletin 210-67 - Standard Test Code for Air Moving Devices (Application for copies should be addressed to the Air Moving and Con- ditioning Association, Inc., 30 West University Drive, Arlington Heights, IL 60004.) AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME) F1 uid blete

14、rs, Part I I, Interim Suppl ement 19.5, Instruments and Apparatus, 1972 (Application for copies should be addressed to the American Society of .lec hanical Engineers, Order Dept, United Engineering Center, 345 E. 47th St., Flew York, NY 10017.) ards are generally available for reference from librari

15、es. They are also distributed among technical groups and using Federal agencies ,) 4 (Technical society and technical association specifications and stand- 3. REQUIREMENTS 3.1 3.2 General requirements. The cabinet shall be in accordance with the First article sample. Prior to beginning production, a

16、 sample shall be tested as specified in 4.2 (see 6.2). requirements of MIL-E-16400 to the extent specified herein. 3.2.1 Material. Unless otherwise specified the materials used in the construction f the cabinets and the methods of application shall be in accord- ande with the material paragraph and

17、the magnetic characteristics paragraph of MIL-E-16400 (see 6.1.1). 3.3 Design and construction. 3.3.1 Drawings and sample. Similar electronic equipment cabinets have been previously manufactured by using the fabrication techniques indicated in drawings REoF2681322 and REF2683864 The Government does

18、not 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I MIL-C-28774 57 7777706 005287i-1 2 W MIL-C-28794 (EC) assume respansibil i ty for the accuracy of the drawings, nor is a contractor required to use the drawings. Mo drawings are presently availa

19、ble for the cabinet specified herein, The contractor is encouraged to study and perform operational analyses in order to improve equipment performance and to reduce -complexity and price. For example, aluminum alloy honeycomb, cellular ex- trusions, as well as sheet metal construction may be conside

20、red for the cabinet sidewalls. The cabinet assembly need only represent the simplest design consistent with the functional and environmental requirements set forth herein. An electronic cabinet assembly will be loaned to the con- tractor as a guideline sample only (see 0.3). The contractor shall not

21、 be relieved of meeting the performance set forth in this specification re- gardless of the use of Government furnished drawings, sample, or construc- tion techniques. 3.3.2 Cabinet assembly. 3i3.2.1 The complete cabinet assembly shall consist of a basic cabinet (including front, rear, and top joini

22、ng strips), blower compartment (see 3.3.5) and a 5-inch (12.7 cm) high steel foundation. . complete list of the contents shall be included in each shipping container. 3.3.3 Dimensions. 3.3.3.1 The cabinet shall be in accordance with the dimensions shown in figure 1. 3.3.3.2 Inside vertical and horiz

23、ontal members shall not exhibit bowness in excess of 0.020 inches (0,0508 cm) in any Flane and panels shall not exceed 0.020 inches (0.0508 cm) bowness in their major plane. Out-of- squareness shall not exceed 0.05 degree for the full internal height dimension of the cabinet. The individual diagonal

24、 measurement of the cabinet front, top, bottom or sides shall not differ more than .O6 inches (0.1524 cm) from rear, bottom, top or opposite sides respectively. 3.3.4 Wei ht The total weight of a complete cabinet assembly (see 3.3.2) shall + e a minimum consistent with good engineering design practi

25、ces and shall not exceed 380 pounds (172.368 kg). 3.3.5 Blower compartment. The blower compartment shall be located at the base of the cabinet and designed to prevent the entrance of unfiltered air. The blower compartment shall contain a terminal board, bracket, and blower chassis assembly. 3.3.5.1

26、Terminal board location. Location of the board in the blower compartment shall permit easy access when the blower chassis assembly is removed. The terminal board and its marking strip which shall be provided by the contractor chal 1 be 3TB10 in accordance ni th ML-T-55164/9. 4 Provided by IHSNot for

27、 ResaleNo reproduction or networking permitted without license from IHS-,-,-MI L-C-28794 (EC) NOTES: 2.00 UST MAX. VENT COVER 1, I 5 7= 19.12 f .O2 :I- 26.00 MINIMUM 1 I YE DEPTH 24.00 +.o0 -.O6 / / 26.34 1. Dimensions are in inches 2. Metric equivalents (to the nearest .O1 mm) are given for general

28、 information only and are based upon 1 inch = 2.54 .Cil Figure 1. Cabinet dimensions 5 7 LIFTING PADEY ES REMOVE AFTER INSTALLATION L EQUIPMENT ENCLOSURE - .- METRIC EqUVkfff INCHES 19.12 t0.02 24.00 +.O0 -,w 26.00 48.5648 +0.0508 60.96 +OD -.1524 66.04 66.9036 +.O762 172.72 +TO508 190.5 270762 12.7

29、 5.08 1 2.00, Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-28794( EC) 3.3.5.2 Blower chassis assembly. The blower hassis assembly shall consist of a chassis deck and front panel, on the chassis deck. Blowers shall operate from 115 volts Hert

30、z (Hz) + 5 percent and shall comply with the environmental, minimum performance, and general configuration requirements of MIL-B-23071/9 and the interference limits for class IC of MIL-STD-461. The blower chassis assembly shall be designed to admit the air supply through an easily removable air filt

31、er mounted in the front panel. The filter shall be the same general construction as specified in MIL-F-16552 with the exceptions that no handles will be required and filter thickness shall be 1 inch (2.54 cm). The blowers shall be installed so as to distribute the air to plenums on e1ther the right-

32、hand or left-hand side of the cabinet or any combination of right and left-hand plenums. Every effort shall be made to minimize the loss of cooling air at the blower-duct output and the cabinet-wall interface. Four blowers shall be installed 10 percent, 60 3.3,5,3 Front anel The front panel of the b

33、lower chassis assembly shall provide _I_t)a means for isconnecting blowers and equipment from the power sources. The front panel shall contain an air filter (see 3.3.5.2) and the fol lowing electrical devices: (a) Four power-on, single throw four pole toggle switches in accordance with MS24525-24. (

34、b) Four power-on indicating lights with red jewel, indicator light hosing style LH80/1 in accordance with MIL-L-3661/38, lens style LC21RD3 in accordance with MIL-L-3661/21, and lamp, Industry No. 6SCDC-125V or equal. accordance with !tIL-F-l9207/20. structural members and within each wall shall be

35、provided four vertical plenums suitable for passing air from the blower compartment to the installed el ectronic equi pment . Each pl enum s ha1 1 have an unres tri cted circul ar di s- charge port with an area of 2.75 inches in diameter (6.985 cm) which shall be located in the upper 20 percent of t

36、he cabinet. A cover for each of the discharge ports which can be mounted flush nith the inside walls shal7 be pro- vided by the contractor, The air flow resistance of the air plenums in the cabinet side k!alls and blower assemblies shall be such that each blower shall deliver 100 standard cubic feet

37、 per minute (scfm) (2.832 cubic meters per minute) to each of the above discharge ports. The internal faces of the cabinets shall be free of any obstructions or projections greater than ,O6 inches (0.1524 cm). to exhaust the air whfch has passed through the sidewall air plenums and electronic equipm

38、ent. The construction of the chimney shall be such that the net exhaust area for airflow is not less than the combined cross sectional area of the sidewall air supply plenums. The cabinet top and chimney shall meet the drip- proof requirements of MIL-STD-108. (c) Eight panel-mounted fuseholders type

39、 FHN31G1 or FHN31G2 in 3.3.6 Cabinet sidewalls. The cabinet sidewalls shall serve as primary . . 3.3.7 Cabinet top. The cabinet top shall contain a removable chimney 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-2774 57 m 7777706 0052877 8

40、m MIL-C-28794 (EC) 3.3.8 Cabinet back. The cabinet shall have a removable back panel to facilitate installation of equipment and cabling. The panel shall ex- tend from the top to the base of the cabinet. 3.3.9 Foundation, . Unless otherwise specified in the contract or order (see 6.1.1 ) , a welded

41、mild steel foundation shall be provided to support the weight of the cabinet plus 1000 pounds (453.6 kg) of equipment evenly distri buted. 3.3.10 Electrical. All internal wiring shall be provided and con- nected between the control panel, terminal board panel and the blowers. Wiring shall be type E-

42、14 in accordance with bIIL-i4-16878/4. Mating connec- tors shall be provided for all receptacles. Fuses shall not be provided. in each corner of the cabinet top. Any single eye installation shall be capable of supporting a complete cabinet (see 3.3.2), “LIFT HERE“ shall be marked adjacent to the lif

43、ting eyes. 3.3.12 Threaded devices. Threaded devices shall be in accordance with the threaded devices paragraphs of MIL-E-16400. 3.3.11 Hoisting. The cabinets shall contain a removable lifting eye 3.3.13 Thread-locking devices. Thread-locking devices shall be in accordance with the thread-locking de

44、vices paragraph of MIL-E-16400. 3.3.14 Welding. Structural welding shall be in accordance with require- ment 13 of MIL-STD-454. 3.3.15 Gaskets. Gaskets shall be .in accordance with the gasket para- graph of W.-O. 3.3.16 Safety. Safety shall be in accordance with requirement 1 of MIL-STD-454. 3.3.17

45、Salt spray. The equipment shall be capable of passing the salt spray test as specifi.ed in 4.4.8 without any visible evidence of corrosi on. 3.4 Airborne noise. With all blowers in operation, the numerical average of airborne sound power levels of three octave ban representing 500 to 2000 Hz shall n

46、ot exceed 64 decibels (dB) above 10 !I3 watts (see 4.4.5). 3.5 Shock, vibration and inclination. 3.5.1 Shock and vibration. The cabinet shall be capable of withstanding grade A, class I, medium weight, type A shock tests of MIL-S-901 and type I environmental vi bration test of MIL-STD-167 when the c

47、abinet is dummy loaded with 1000 pounds (453.6 kg) of equally distributed weight. The maximum vibra- tion frequency and displacement to be used for conducting the endurance test 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-28794 (EC 1 + O

48、008 +o shall be 25 Hz and 0.040 - 0:ooo inches (.lo16 -0.1 cm) respectively (see 4.4.6). The dummy loads shall be mounted in seven identical chassis assem- blies which are fastened to the front of the cabinet by high strength machine screws. Shear oins shall be used both in the front panel and at th

49、e back of the chassis assembly. The shear pins at the rear shall engage a horizontal tie bar which is secured to the sidewalls of the cabinet. Except at the con- nection points, the chassis assembly and load shall be 1 inch (2.54 cm) or greater from the cabinet sidewalls. See figure 2 for design configuration . of chassis assembly and dumny loads. The seven identical chassis assemblies shall be located in the cabinet such that