1、AMENDMENT 6 23 October 1975 SUPERSEDING AMENDMENT 5 21 February 1974 MILITARY SPECIFICATION MOTOR-GENERATOR: 100 KW This amendment forms a part of Military Specification MIL-M-28903 (MC), dated 12 December 1968, and is approved for use by all Departments and Agencies of the Department of Defense. PA
2、GE 1 1.1: Delete the second sentence and substitute: “The motor input current is to be 3 phase, 416/208 volt (VI, 60 Hz, 4 wire, and the alternator output is to be 100 kilowatts (kw), 0.8 power factor (pf) lagging, 60 or 400 Hz as specified (see 6.21, 3 phase, 4 wire, 120/208 v, reconnectible to 240
3、/416 v.(I 2.1 : Under “SPECIFICATIONS FEDERAL“, add “FF-B-185 - Bearings, Roller, Cylindrical, And Bearings, Roller, Self-Aligning“, PAGE 2 2.1 : Under VSPECIFICATIONS MILITARY“, add: “MIL-M-8380 MIL-G-81322 -Meter; Alternating Current Frequency, Type B-1 (400 Cycle-Aircraft). -Grease, Aircraft, Gen
4、eral Purpose, Wide Temperature Range. I PAGE 3 2.2: Add the following: A AMERICAN IRON AND STEEL INSTITUTE Steel Products Manual for Stainless and Heat Resisting Steel (Application for copies should be addressed to the American Iron and Steel Institute, 350 Fifth Avenue, New York, N. Y. 11218.)“ FSC
5、 6125 E I . L. Licensed by Information Handling ServicesMIL-M=28903(MC) AMENDMENT 6 PAGE 5 3.2.1: Delete third sentence in entirety. PAGE 11 3.5.1 (f): Delete: “causing zero visibility in bright sunlight“ and substitute “conditions specified in method 711.4 of MIL-STD-705.“ 3.5.3 Delete in entirety
6、and substitute: “3.5.3 Operating speed. The operating speed shall not exceed 1,800 revolutions per minute for 60 Hz output sets and 1,846 revolutions for 400 Hz output sets.“ PAGE 12 3.5.9: At end of paragraph, add “class IIB and those portions of class IIIB applicable to motor-generators.“ 3.5.10.4
7、: Delete and substitute: “3.5.10.4 Transit voltage regulation. Performance of the set under transient conditions (as measured and recorded by a magnetic oscillo- graph) shall be as follows: (a) With the set initially operating at no load, rated voltage, and rated frequency of 60 Hz, the characterist
8、ics of the generator and excitation system shall be such that the minimum rms terminal voltage of the generator does not drop to less than 75 percent of the no load voltage when a balanced 3-phase, 0.4 pf (or less) static load having an impedance of 0.5 per unit based on rated generator kilovolt-amp
9、ere is suddenly applied to the output terminals of the generator. When connect- ed to the specified load, the generator shall recover to a minimum of 0.95 per unit within 300 milliseconds (ms) and shall stabilize at or above this voltage. 1 (b) With the set initially at no load and rated voltage, an
10、d . with rated load at rated pf suddenly applied to the load terminals of the set, the minimum instantaneous rms load voltage shall be not less than 90 percent of the no load voltage and the load voltage shall return to rated value within 200 ms.“ PAGE 13 3.5.10.5: Delete the first sentence and subs
11、titute: “Amplitude modu- lation of the output voltage of the generator when operating with its i u #- Page 2 of 8 pages r Licensed by Information Handling Services MIL-M- 28903W 1 MIL-M-28903 (b) bl = 999770b 0091222 5 AMENDMENT 6 intended voltage regulator shall not exceed 15 percent of the peak vo
12、 1 tag e e 3.5.10.6: Delete percent“ and substitute “10 percent.“ PAGE 14 After 3.7.3, add new paragraph as follows: “3.7.4 Repair parts and tools. The contractor shall furnish a rec- ommended listing of spare parts and tools required (see 6.2). No ship- - ment of sets shall be made unless repair pa
13、rts and maintenance tools are included with the shipment or unless approval for shipment of the sets without such items has been received from the contracting officer.“ %E 15 3.8.8: Delete the first sentence and substitute “An insulated wrench, designed to fit the load and supply terminals, shall be
14、 provided.“ PAGE 17 3.9.1 (h) : Line 3: Delete “between the filters and the cooling fa Line 4: Delete “10 inches“ and substitute “4 inches.“ Sentences 3 and 4: Delete in entirety. At end of paragraph, add “Al1 doors shall be vertically mp: - by use of piano-type hinges, shall have quick disconnect l
15、zt,- be fitted to hold each door open at 300 and 900. A d:. . shall be provided over the doors to prevent entry of rain c ,-ha1 1 snow.“ PAGE 18 After 3.10, add new paragraph as follows: “3.10.1 Forklift openings. Openings shall be provided in the skid base to permit insertion of forklift tynes. Eac
16、h opening shall be not less than 11 inches by 3 inches in size. Openings shall be located so that the center of gravity of the set falls approximately midway between the centers of the forklift openings. of the openings shall be not less than 36 inches nor more than 60 inches. The distance between t
17、he centers Page 3 of 8 pages Licensed by Information Handling Services- MIL-M-28903 (6) 63 W 7997706 0073223 7 - MIL-M-28903(MC) AMENDMENT 6 The openings shall be reinforced and equipped with guides so that the set will not be damaged if it is lifted by a forklift, the tynes of which do not extend c
18、ompletely through the skid base. base may be fabricated or formed from AISI-1010-1020 steel plate.“ Tyne guides in the skid PAGE 20 3.11.9: Delete and substitute: “3.11.9 Bearings. Bearing selection will be compatible with the maximum anticipated rotor loads and operating speeds. Sealed bearings con
19、forming to FF-B-171 or FF-B-185, as applicable, shall be used and shall be lubricated with grease conforming to MIL-G-23827, MIL-G-81322 or equivalent.“ PAGE 22 3.12.1.2: Line 2: Delete “all solid state“ and substitute lia full range regulator.“ Line 3 and 4: Delete “thus acting as a trim for the co
20、mpounding features of the exciter and providing“ and substitute “and chal? provide. PAGE 23 3.12.2: Line 6: Delete and substitute: Vol tage -416/208 v $10 percent“ Line 11: Delete “assuming 416 v“ and substitute “assuming 416/208 v.“ PAGE 24 3.12.2, Line 1: Delete “shall not exceed 380 rms amperes“
21、and substitute “shall not exceed 309 rms amperes at the 416-v connection or 618 rms amperes at the 208-v connectiongf. 3.12.2.1: Second sentence: Delete and substitute: “The starter shall be a 3- phase, magnetic, continuous duty, part winding type starter rated at 60 Hz, 416/208 v 210 percent.“ Page
22、 4 of R pages I a- - I (“3, Licensed by Information Handling ServicesMIL-M-28703 (6) 63 m 7797706 0073224 7 m MIL-M-28903(MC) AMENDMENT 6 PAGE 26 3.16.1.1, line 28: Delete Voltmeter, 28-v, direct current.“ PAGE 27 3.16.1.2.2: Delete in entirety and substitute: “3.16.1.2.2 Frequency meter, fzenerator
23、. The frequency meter shall conform to MIL-M-8380 for 400-H application except as otherwise specified herein. meter conforming to MIL-M-8380 is preferred; however, any meter is For 60-Hz application, a vibrating reed type frequency acceptable, provided that motor generator in regard specified herein
24、.“ 3.16.1.2.10: At end of the meter does not degrade the ability of the to the enviromental and handling parameters PAGE 31 paragraph, add “A built-in test circuit shall -. be provided to test the indicating light.“ PAGE 33 3.17.4: Delete in entirety and substitute: “3.17.4 Frequency-sensitive trip.
25、 The frequency-sensitive trip shall cause the generator circuit interrupter to open when the output frequency drops as f o1 lows : a) On the 4-H output set to 365 25 Hz ib) On the 60-Hz output set to 54 22 Hz“ PAGE 36 Table I: Column 4: For “Rain“ test, delete “X.“ For “Regulator range“ test, insert
26、 llXel Column 6: Foi: “Regulator range“ test, delete “5.11.1“ and substitute “511.1 Page 5 of 8 pages Licensed by Information Handling ServicesMIL-M-28703 (b) bL m 77977Ob 0073225 O m MIL-M-28903(MC) AMENDMENT 6 For “Rain“ test, delete “7.11.3“ and substitute “711.3.“ For Electromagnetic compatibili
27、ty“ test, delete “4.6.3.2“ and substitute “4.7.3.2. I PAGE 37 Table I: Column 1: For “Sand & dust“ test, delete “Xe“ Column 2: For “Sand & dust“ test, add tX.ll PAGE 39 Table I, column 5: Delete “Voltage regulation and droop“ and substi- tute Vol tage regulation“. PAGE 40 4.6.1: Delete and substitut
28、e: “4.6.1 Samplinq, Quantity for sampling tests shall be selected as follows: Consecutively Produced Articles Quantity Selected for Samples 1-25 (after the initial produc- tion quantity) 2 26-75 1 76-125 Over 125 1 4.6.3.2: Delete and substitute: t4.6.e3.2 Samples. Each sample selected in accordance
29、 with 4.6.1 shall be subjected to individual tests marked in column 3 of Table I. After successful completion of these tests, the samples shall then be subjected to tests marked *X“ in column 4 of Table I in the sequence listed. article tests or other tests which the Government inspector deems neces
30、sary to determine that the production sets continue to be equivalent in performance and construction to the approved first article.“ In addition, the sarnplesshall be subjected to any of the first 1 for each 50 of the contract.“ c Page 6 of 8 pages Licensed by Information Handling ServicesMIL-il-289
31、03 (6) bL 999990b 009L22b 2 _ _ MIL-M-28903(MC AMENDMENT 6 PAGE 41 4.7.1: Line 3: Delete %ahalll and substitute “shall“. At end of paragraph: Add “Tests outlined in 4.7.3 and not listed in Table I shall be conducted during the first article testing.“ PAGE 43 4.7.3.8: Delete in entirety. PAGE 44 4.9.
32、1.2: Delete and substitute: “4.9.1.2 Samplinq. Quantity for sampling examination of prepara: tion for delivery shall be selected in accordance with 4.6.1c“ 4.9.1.3: Delete last sentence. PAGE 46 6.2: Delete and substitute: “6.2 Ordering data. Purchasers should exercise any desired options offered he
33、rein, and procurement documents should specify the following: “6.2.1 Pyocurement requirements. (a) Title, number and date of this specification. . (b) (cl Output current Hz required (see 1.1). Time frame required for submission of the first article and number of sets furnished (see 3.2). (d) When in
34、itial production inspection is required (see 3.3). (e) Number of sets to be furnished for initial production inspec- tion when applicable (see 3.3). (f) (g) Repair parts and maintenance tools required (see 3.7.4). Time interval for submission of electromagnetic compatibility reports (see 4.7.3.2). P
35、age 7 of 8 pages a Licensed by Information Handling ServicesMIL-M-28903 (6) 63 W 979990b 0073227 4 W .- -. _ . - ._ -. MIL-M-28903(MC) AMENDMENT 6 (h) Level of preservation, packaging and packing required (see 5.1 and 5.2). “6.2.2 Contract data requirements. Data conforming to Data Item Descriptions
36、 DI-E-4527, DI-E-4528, DI-M-4704, DI-R-4803 and DI-T-4902 will usually be required for delivery in connection with this specifi- cation. When so required, such data will be specified for delivery on a DD Form 1423 included in the contract.“ Preparing activity: Project No. 6125-N180 Navy - MC Page8 of 8. pages Licensed by Information Handling Services
