1、mL-c-i907.4( os) 27 August 1970 Superseding . MTL- C -19087 ( Nord) 16 Septelliber 1955 +XILIFpARY SPECIFICATION COhmCTOR S (For Torpedo Idark 37 Mods O, 2, and 3) This specisica*ion has been approved by the Naval Ordnance Systems Command, Department of the Navy 1. scorn ! 1.1 Scope. This specificat
2、ion describes the requirements for the man- ufacture, procuremen-k, inspection, and test of series and paralleling con- tactors, K4VORD Drawings 877137 and. 877138. 2. APPLICABU DOOMENTS . 2.1 The following documents of the issue in effect on date of invita- tion for bids or request for proposals fo
3、rm a part of this specification to the ment specified herein. =- - mc IF1cm10xs _. %f_ -=. . I- -. . . * -%- . _. . . .- Federal . . ? 1 , . PPP-B- -19087A( OS) Xaval Ordriance Syskems Comznd Ordnance Design Requirements, General, Miscellaneous (Copies of specifications, standards, drawings, and pub
4、lications re- qussted by contractors in connection icith specific procurement functions snould be obtained from the procuring activity or as directed by the con- tracting oIricer. ) 2.2 other plica-kions. The f olloiiing documents form a part of this specification to the extent specified herein. Unl
5、ess otherwise indicated, . the issue in efect on date of invitation for bids or request for proposals shall apply. NATIONAL BUREAU OF mS ?BLICATIONS Handbook 28 . Screw Thread. Standards for Federal Services (Applica$ions for copies should be addressed to the Superintendent of Documents, Government
6、Printing Office, Washington, D. C. 20402.) 3. REQWREWZNTS 3.1 Description. The two contactors described herein are electrically operated switching devices for intermittent duty, across the line, torpedo motor starting service and are mechanically and physically alike except for their contact and int
7、erlock configuration. The series contactor is a single-pole, single-throw, double-break tme, while the paralleling contactor has a double-pole, single-throw, single-break arrangement. The armatures of both contactors have knife edge type.hinges and are counter- balanced and mechanically interlocked
8、by a linkage which effectively pre- vents both contactors from being closed simultaneously. The contactors me designed for mounting with their bases lying in vertical, parallel planes, and their contacts uppermost as shown on NAVORD Drawing 877132. The contactor coils ase designed for operation at 2
9、4 volts direct cimren% (dc), noinina. to the “toe“ o“ I the contacts while the “heel“ o.the contacts carry tne current. oxide powders and are so mounted thatthe moving contact will rock during closing and opening so as to minimize welding and sticking. is provided to assist in extinguishing the arc
10、during current interruption. The contact faces are so designed as to limit the arcir-g The contacts are fabricated Irom sintered silver and cadmium An arc shield 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,- c - 19087-4 ( OS ) 3 . 2 Ceneral requ
11、irenenks 3.2.1 3ata required, No ata is reqdred by tnis spxilication (other than reports accompanying smples submi-ked for preproduction an6 periodic producSon testing), or by applicable documents referenced in Section 2, iinless specified in the contract or order (see 6.2). 3.2.2 Preproduction sqle
12、. Unless otherwise specified in the contract . or order, preproduction samples of the contactors shall be manufactured using the methods and procedures proposed for the production 10%. These units shall be tested as specified in Section 4 herein and are for the purpose of determining, prior to start
13、ing production, that the contractors prduction methods are capable of producing contactors that coniply with the technica requirements or the contract. See 4.3.1. 3.2.3 Waterials. Unless otherwise specified in the contract , requisi- tion, or order, all materials and purchased parts entering into th
14、e final assembly of the contactors shaJ-1 conform strictly to the detailed require- ments indicaked on the drawings and specifications listed on NAVORD Draw-. ings 877137 and 877138. ?nI J.C.+ Finishes, coatings, construction, and dimensions. Finishes, cc=tis and prodxzt characteristics. The con- ta
15、ctors shaL1 meet the follozing perfomrmce requirements and product 4 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C-L7087A 13 7777706 0300235 7 - MTL-c -i9087( US) characteristics. Unless otnemse specified, all parts an subassezrklies herein r
16、eferred to ase listed on MTTm Drawings 877137 and 877138. - ing 877137) and the paralleling con%actor ( IQVOEI Drawing 877138) : 3.4.1 Characteristics comon to both the series contactor (XAVORD saw- 3.4.1.1 Pick-u2. The contactors shall pick-up when a maxi.raurn of 10 volts dc is applied to the coil
17、 (NAVfw Drawing 815178). 3.4.1.2 Seal-in. The contactors shall seal-in so that the armatme (NAVORD oication of voltage to the coil, or hana pressme to the armture, the contacts shall close so tha-i;: .- 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,
18、-,-3m,-c-1908( os) 3.4.e2.1 hen one pair OI contacts just closes, the other pair shal nest, or be open no% mare than 1/32 inch. be within 9/32 inch of the toe end of thz contacto 3,4.1.6.2.2 Chen the conAacts first mset, the line of contact shall 3.4.1.6.2.3 As the amature seals in, the moving conta
19、cts shall rock. 3.4.1.6.2.4 When the armature is tightagainst the pole face, the line of contact shall be i/4 -11/8 inch from the heel end of each pair of con- tact s. 3.4 .1. 7 Insulation 3.4.1.7.1 The insulation used in the contactors shall be of such class that the flow of heat will not destroy a
20、ny portion of the contactor within the operating life as set forth in 3.4.5. of “Silicones“ are not acceptable due to the deleterious effect of silicche vapors on commuta-bing machinery. 3.4.1.7.3 Insulation resistance. At tne time of manufacture, the con- tactor shall have a minimum insulation resi
21、stance of 100 megohms, at am- bient temperature, and a minimum of one megohm resistance at 100C +1O“C (212 OF +18“), measured between open contacts and between closed contacts and the contactor frame (ground), arid between the coil and the frame. 3.4.1.7.2 Insulating materials falling under the come
22、rcial designation 3.4.1.7.4 Overpotential. The contactors shall withstand, without break- down, an alternating current (ac) voltage (hi-pot test) of i150 k50 volts root mean square (rms) nina, at 60 Hertz (Hz) applied for 60 k6 seconds between all current carrying par%s (including the coil) and the
23、frame of the contactor . 3.4.2 Series contackor function. When mounted in the operating posi- tion with the base vertical and the contacts uppermost: 3.6.2.1 The contactor shall be capable of connecting a battery having an apen circuit voltage 03 110 xrolts nominal directly across a series r?otcr so
24、 that %he ped starting current is 2000 k200 amperes (amps), fal- ling approximately exponentialy to 525 +25 amps in 1.6 k0.8 seconds. or 525 125 amps (at 80 volts noninal) for at least 20 minutes without ex- ceeding a teqerature rise o? 125C (257F) in the current carrying parts. 3.4.2.2 After starti
25、ng t;?e notor, the contactor shall carry a curent 6 n Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NIL-C-17087A 13 W 33773Ob 0300237 2 . - 3.a.2.3 With t3e arc shield in place, ?ne contactor shall be capble or Pnterrupting the motor currec of 525
26、f25 amps at 80 vols aiimm. Ail arcins shall occur at Yne toe of the contacts so that repeated cycles of the contactor will not be adversely affected. 3.4.3 Paralleling contator function. When mounted in Kne operating position with the base vertical and the contacts uppermost: 3.4.3.1 Each section of
27、 the contactor shllbe capable of connecting a battery havtng an open circuit voltage of 55 volts nominal directly across a series motor sothat the peak sth in + 3. .2 for the series contactor and 3.4.3 for the paralleling contactor in the sequence given. 3.4.5 Operating life. The operating life of b
28、oth the series and par- alleling contactors shall consist of at least 200 duty cycles as set forth in 3.4.4. 3.5 Environmental requirements. The contactors shall meet the other applicable requirements of this specification during or after the tests defined or specified in 4. 5. 3.5.1 Vibration. The
29、contactors shall meet the Tollowing vibration requiremnts : 3.5.1.1 Vibration, nonoperating. The contactors shall show no damage and shall meet all the performance requirements and product characteristics or ths specification aftei. being tested as in 4.5.i02. 3.5.1.2 Vibrationl operating. The conta
30、ctors shall show no danage and shall meet all the performance reqrements and product characteristics 02 ihis specification during and after the test specified in 4.5.1.3. 7 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-3.5.1.3 Vibration, transporta
31、tion. The contactors dial1 show no daxage aac 3I.l met all the perZomance requirements and product characteristics of this specification after being tested as in 4.5.1.4. 3.5.2 Shock, transportation. The contactors shall shm no dmge and SKU =et all the performance requirements and prcduct characteri
32、stics of this speciication after being tested as in 4.5.2. 3.5.3 Temperatwe and humidity 3.5.3.1 High temperature and humidity, nonoperating. The contactors shal. show no damage and shCU meet all the perfomnce requirements and product characteristics of this Specification mer being tested as in 4.5.
33、3.1. . 3.5.3.2 High temperature, operating. The contactors she be capable of meeting all the perfomnce requirements of this specification while undergoing the test specified in 4.5.3.2. 3.5.3.3 Low teaperature, nonoperating. The contactors shall neet al1 the perfmmnce requirements and product charac
34、teristics of this specifi- cation after being tested as in 4.5.3.3. 3.5.3.4 Low temperature, operating. The contactors. shall be capable of meeting all the perfomiiznce requirements of this specification while undergoing the test specified in 4.5.3.4. 3.6 Screw assemblies. Assembly screws shall be t
35、ight. The wcrrd ittight“ means Chat screws shall be tightened in conformance with established stand- ard engineering practices. a Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-m-c-i9087( OS) 3.7 Riveting. Sive%ing operations shdl be carefuily perio
36、med in oyder to ensure that ?fie rivets are tight and.satisfactorily headed. 3.8 CleanuF. =ter final assenibly all contactors shall be thoroughly cleaned of loose, spa$%ered, or excess solder, metal chips, and other foreign aatter. Burrs and- sharp edges as well as rosin flash shall be rmoved. 3.9 W
37、ork;nar;ship, The equipment, including all parts and accessories, shall be constructed aad finished in a thoroughly workmanlike manner which will ensure its meeting ali the requirements set forth herein. Particular attention shall be paid to neatness and thoroughness of soldering, wiring, impregnati
38、on of coils, marking of pmts and assemblies, plating, riveting, machine screw assedolage, welding, brazing, and freedom of parts from burrs an sharp edges. The standards of workmanship exhibited in any approved preprouction sample, subject to any qualification stated in the Governmentis notice of ap
39、proval shall be determinative of the requirements of the contract rela- tive to workmanship insofaz as not specifically covered by applicable spec- ifications. 4. QUALITY ASSURANGE PROVISIONS 4.1 ResponsibiUty for inspection. Unless otherwise Specified in the contract or purchase order, the supplier
40、 is responsible for the perform- ance of all inspeckion requirements as specified herein. wise specified in the contract or order, the supplier may use his own or any other facilities suitable for the performance of the inspection re- quirements specified herein, uizless disapproved by the Governmen
41、t. The Government reserves the right to perform any of the inspections set forth in the specification where such inspections are deemed necessary to assure supplies and services conform to prescribed requirements. Except as other-. 4.2 Classification of inspections. Inspection- of the contactors sha
42、ll be classified as follows: (a) Preproduction inspection (paragraph 4.5) (b) (c) Quality conformance inspection (paragraph 4.4) Periodic production inspection (paragraph 4.5) 4.3 samping 4.3.1 Frepoduckion. A preproduction sample of five series and Tive prdleling contaciors, mnufactured in accordan
43、ce with 3.2.2, shall be nated by the procuring activity. subjected to Yne preproduction tests detailed in 4.5 at an activity desig- “C Acceptance of the preproduction sample Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-m-19087( OS) shall be base o
44、n no defects in the smple, RwCner pouction of the contactsrs by the supplier, prior to the approval of the preproduction sqle, shall be at the suppliers risk. 4.3.2 Lot size. Unless otherwise specified in the contract or order, each shipment of units of product shall be a sepuate “inspection lot“ an
45、d may diIffer Irom the quantity specified in the total order or contract. In any event, all units of a single “inspection lot“ shall be made to the same design, with the same materials and manufacturing techniques, and SU be part o one continuous production run. 4.3.3 Periodic production samples. Fr
46、om each succeeding lot or grand lot of 300 or less that have passed the quality conforaance inspection of 4.4, a random sample of five series and five paralleling contactors will be selected for submission to an activity designated by tne procuring activity to determine compliance of the samples wit
47、h the requirements of the contract, spscification, and drawings. The contactors shall be con- sidered satisfactory if they meet aJl specification and pertlnent drawings requirements and withstand the tests specified in 4.4 and 4.5. Failure of the periodic production sampe to comply,with these-requir
48、ements will result in the rejection of the lot, as determined by the procuring activity. 4.4 Quality conformance inspection. Each contactor delivered under con- tract shall be subjected to the following tests and examinations. Failure to meet any requirement spcified herein shall be considered cause
49、 for re- jet t ion . 4.4.1 Tsst conditions. Uness otherwise specified, the contactors . shal be subjected to quality conformance tests under the following con- ditions : 4.4.1.1 Temperature: Room ambient 65“ to 95F (18“c to 35C). 4.4.1.2 Altitude; Normal ground. 4.4.1.3 Vibration: None. 4,4.i.4 Hunidity: Room aabient to 95% relative, maximum. 4.4.2 Tes
