1、MIL-C- 18438B(SHJPS) 14 June 1962 SUPERSEDING MIL-C-l8438A(SHPS) 3 February 1959 MILITARY SPECIFICATION CHARGERS, BATTERY, GENERATOR TYPE 1. Scope 1.1 This specification covers generator type battery chargers and associated control equipment for shipboard (marine) use in two wire direct cur- rent di
2、stribution systems. 1.2 Classification. - 1.2.1 Types. - The battery chargers shall be of the foIlowing types as specified (see 6.1): Type I - Direct current generator and control Type II - Three phase alternating current (a.c.) unit. generator, rectifier and control unit. (Power rectifiers air blas
3、t cooled by means of the generator fan or blower). 1.2.2 Classes. - The battery chargers shall be of the types and classes shown in table I, as speci- fied (see 6.1): !lass 1 2 3 4 5 6 7 8 9 10 11 12 13 14 - 15 16 17 _c Table I - Classes Type Rated watts I Under 250 I Under 250 I Under 250 I 250 I 2
4、50 I 500 I 500 I 1000 I 1000 I 2000 I 5000 II 500 II 500 II 1000 II 1000 II 2000 II 5000 Rated volts 7.2 14.3 28.5 14.3 28.5 14.3 28.5 14.3 28.5 28.5 28.5 14.3 28.5 14,3 28.5 28.5 28.5 2. APPLICABLE DOCUMENTS 2. i The following documents, of the issue in effect on date of invitation for bids, form a
5、 part of this specification to the extent specified herein. SPECIFICATIONS FEDERAL FF-B-111 - Bearings, Ball, Annular, (Gen- eral Purpose). MILITARY MIL-E-1 - Electron Tubes and Crystal Rectifiers. MIL-R-22 - Resistors, Variable (Wire- bound Power Type). MIL-C-25 - Capacitors, Fixed, Paper - Dielect
6、ric, Direct Current (Hermetically Sealed in Metallic Cases) General Specification for. lytic (DC, Aluminum Dry Electrolytic, Polarized) General Specification for. MIL-A-907 - Antiseize Compound, High Temperature. MIL-E-917 - Electric Power Equipment, Basic Requirements for (Naval Shipboard Use). MIL
7、-D-963 - Drawings, Electrical, Hull and Mechanical Equipment for Naval Shipboard Use. MIL-B-3743 - Brushes, Electrical Contact; and Carbon Stock, Electri- cal Contact, Brushes. MIL-C-5541 - Chemical Films for Alumi- num and Aluminum Alloys. MIL-A-8625 - Anodic Coatings, for Alumi- num and Aluminum A
8、lloys. MIL-Q-9858 - Quality Control System Re- quirements. MIL-C-11693 - Capacitors, Feed Through, Radio Interference Reduc- tion, Paper Dielectric, AC and DC (Hermetically Sealed in Metallic Cases). - MIL-M-15071- Manuals, Equipment and Systems. MIL-R-15109 - Resistors and Rheostats, Shockproof (Na
9、val Ship- board Use). MIL-F-15733 - Filters, Radio Interference, General Specification for. MIL-1-16910 - Interference Measurement, Radio, Methods and Limits; 14 Kilocycles to 1000 Mega- cycles. MIL-C-62 - Capacitors, Fixed, Electro- Y, IFSC 6130 I THIS DOCUMENT CONTAINS 36 PAGES. Provided by IHSNot
10、 for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C- 18438B(SHIPS) MILITARY (Contd. ) MIL-E-17555 - Electronic and Electrical Equipment and Associated Repair Parts, Prepara- tion for Delivery of. MIL-R-18281 - Rectifiers, Metallic: Se- lenium, Copper-Oxide, and Magn
11、esium-Copper Suifide Types, Naval Shipboard Use. General Specification for. MIL-S-19500 - Semiconductor Devices, STANDARDS MILITARY MIL-STD-195 - Marking of Connections for Electrical Assem- blies. MIL-STD-242 - Electronic Component Parts (Selected Standards for). MIL-STD-408 - Brushes, Electrical C
12、on- tact, Rectangular, Stand- ard Designs and Dimen- sions for. MIL-STD-701 - Preferred and Guidance Lists of Semiconductor Devices. DRAWINGS BUREAU OF SHIPS RE 49A501 - Couplings, Spherical Seat, Design Data. (Copies of specifications, standards, drawings, and publications required by contractors i
13、n connec- tion with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer. ) 3 I REQUIREMENTS 3.1 Definitions, - 3.1.4 Full load speed range is the range of gen- erator speed at which the battery charger (hot) can deliver rated curren
14、t and maintain voltage to within plus or minus 3 percent of rated value. 3.1.5 Full or rated load is defined as the current delivered by the battery charger when operating under a load corresponding to the rated watts and volts specified for the particular type and class of battery charger shown und
15、er 1 2.2. 3.1.6 Cut in speed is defined as the speed where sufficient generator voltage is produced to energize and close the control unit relay which connects the battery charger to the battery. 3.2 Detail requirements. - 3.2.1 Material. - Material shall be new, and unused, and shall be first class
16、 in every respect. Further, such material shall insure continued opera- tion under the conditions of heat, moisture and vibra- tion specified herein, Military standard parts shall be used whenever they are suitable for the purpose. When military standard parts are not available, AN parts shall be us
17、ed. Where military standard and AN parts are not suitable, the use of commercial grade basic materials equivalent to the minimum charac- teristics and performances of the applicable military specifications is encouraged. When military stand- ard parts, AN parts or parts referenced in military specif
18、ications are suitable and commerical parts are used, drawings shall show the commercial part and the corresponding military standard, AN or military specification part which can be used as a replacement for the commercial part. Source inspection of basic material shall be kept to a minimum consisten
19、t with quality control as required to assure that construc- tion and performance requirements have been met. Materials, specifically prohibited by the requirements of MIL-E-917 shall not be used. Further, the use of magnesium and its alloys is prohibited. 3.2.2 Interchangeability. - All similar part
20、s, including repair parts, furnished under the specifi- cation and manufactured to the same drawings shall be strictly interchangeable without the necessity of further machining or hand fitting. 3.2.3 The design and construction of the equip- ment shall be such as to obtain conformance with the requ
21、irements herein and with good engineering prac- tice. Workmanship shall be first class in every respect. 3.2.4 Unless otherwise specified in the contract or order (see 6. i), all equipment shall be of the two wire (ungrounded) design. 3.2.5 insulation material, insulation varnish, varnish treatment,
22、 clearance and creepage dis- tances shall meet the requirements of MIL-E-917. . 3.1.1 Minimum full load speed is the minimum generator speed at which the battery charger (hot) will deliver rated load at a voltage which is constant to within plus or minus 3 percent of rated value. 3.1.2 Maximum full
23、load speed is the maximum generator speed at which the battery charger (hot) will deIiver rated load at a voltage which is constant to within plus or minus 3 percent of rated value, 3.1.3 The battery charger shall be defined as “hot“ when its operating temperature is stabilized by operation at the l
24、owest speed at which rated cur- rent can be obtained and voltage can be maintained constant within plus or minus 3 percent of rated value. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-C- 18438B(SHIPS) 3.2.6 Battery chargers covered by this s
25、pecifi- cation shall be considered acceptable provided the particular design, type or model meets the mate- rial, construction and performance requirements of this specification and has demonstrated its ability to meet al least one of the following conditions: The design has been previously accepted
26、 and has been successfully evaluated as a shipboard installation. The design has been successfully applied in commercial marine service or has been laboratory tested for a period of at least 1000 hours. During the first 1000 hours in service or during the first 1000 hours of laboratory tests, the ba
27、ttery charger shall have operated without the necessity of replacing, repairing or adjusting of any part. Successful completion of the 1000 hour test as specified (see 4.5.19) prior to delivery of production units. 3.2.6.1 If condition (3.2.6(a) can be met, a technical dissertation shall be provided
28、 with bid data. This dissertation shall include: (a) Available shop drawings showing assem- bly and installation feature .of the battery charger. (b) Name and address of the activity which had previously procured the proposed battery charger. orders for previous procurements of the battery charger.
29、(d) Manufacturers type or model number for the battery charger. (e) Identification of ships, boats or craft on which proposed charger has been in- stalled. (c) Identification of contract or purchase 3.2.6.2 If condition 3.2.6(b) can be met, atech- nical dissertation shall be submitted with bid data.
30、 This dissertation shall include the information re- quired by 3.2.6.1(a), 3.2.6.l(d) and the following: (a) At least two names and addresses of com- mercial marine activities using the pro- posed battery charger or the name and address of the laboratory which conducted evaluation tests. 3.2.7 Batte
31、ry chargers shall be designed and constructed for operation when connected to a bat- tery in any state of charge from discharge to full charge, at any speed below the zero load speedpoint and up to maximum full load speed and at any ambi- ent temperature between minus 30F. and 122F. 3.2.8 Generators
32、 (including power rectifiers) shall be designed for operation when rotated up to 180 degrees about the axis of the generator shaft and when permanently inclined up to 30 degrees in any di- rection from the normal horizontal position of the generator shaft. Control units shall be designed for operati
33、on when permanently inclined up to 30 degrees (in any direction) from the normal mounting position. 3.2.9 Use of aluminum. - The use of aluminum or aluminum alloys (except aluminum material de- signed to carry current) shall conform to the following: 3.2.9.1 Unpainted surfaces of aluminum or alu- mi
34、num alloys shall be treated to conform to the re- quirements of MIL-A-8625. Surfaces to be painted shall be treated to conform with the requirements of MIL-C-5541. 3.2.9.2 Contact between dissimilar metals shall be avoided as much as possible. Where the use of dissimilar metals is unavoidable, the a
35、luminum al- loys shall have their faying surfaces anodized. 3.2.9.3 Where threaded surfaces or faying sur- faces may require disassembly in service, an anti- seize compound conformkg to MIL-A-907 shall be used. For the assembly of aluminum alloy parts, through bolting is preferred using cadmium or z
36、inc plated steel bolts and nuts; this applies par- ticularly to comparatively highly stressed assem- blies or those subject to vibrating loads. Where the use of tap bolts or machine screws is necessary, these shall be threaded into steel inserts in the alu- minum alloy. The steel inserts shall be se
37、cured in such a manner as to prevent their turning or backing out. No alloys of copper, such as brass or bronze, will be acceptable for use in threaded contact with aluminum alloys. 3.2.10 All hardware such as springs, bolts, nuts and studs shall be made of cgrrosion resistant mate- rial or shall be
38、 treated for corrosion resistance. 3.2.11 Parallel operation. - Unless otherwise specified in the contract or order (see 6.1) class 1 through class 7, class 12 and class 13 shall not be designed for parallel operation. Class 8 through class 11 and class 14 through class 17 shall be de- signed so tha
39、t they can operate as single units and in parallel. When generators are operating in parallel, each generator shall not deliver more than 100 per- cent of its rated load continuously or 110 percent rated load intermittently at any speed from “cut in“ to maximum full load spe.ed and at any total load
40、 from. zero to a load equal to the sum of the ratings of ma- chines in parallel. There shall be no periodic pulsa- tion of loads between generators; the voltage regula- tion shall conform with the requirements herein; and 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without
41、 license from IHS-,-,-_ - _ MIL-C-L43B bL U 4999706 0087343 Li MIL-C- 18438B(SHIPS) there shall be no maloperation of control units com- ponents (such as chattering of load relay or cut-out relay contacts) at any speed or load noted above. 3.2,12 Vibration. - Normally, generators and power rectifier
42、s will be mounted on and driven by the prime mover. Control units will normally be bulkhead mounted adjacent to the prime mover. Accordingly, generators and rectifiers mounted within the generator enclosure shall meet the per- formance requirements specified herein under the mechanical shock and str
43、esses resuIting from the internally excited and torsional vibration charac- teristics of the prime mover. In addition, the equipment shall be designed to operate satisfacto- rily under the environmeiital vibration conditions on- board hats and craft. These conditions involve vibrationirequencies whi
44、ch vary from zero to ap- proximately 1500 cycles per minute with amplitudes of vibration as much as plus or minus 0,030 inch. Control units shall be designed to operate satisfac- torily under the specified environmental vibration conditions. 3.2.13 Enclosures, - Except as otherwise specified (see 6.
45、 l), generator enclosures for class 1 through class 9, and class 12 through class 15 battery chargers shall be totally enclosed so that when water is sprayed on the outside of the enclo- sure, water will not enter the enclosure and cause maloperation or damage to components. Unless otherwise specifi
46、ed, generator enclosures for class 10,ll) 16 and 17 shall be of the dripproof protected type which shall be constructed so that drops of water falling vertically shall not enter the equipment and cause damage to components when the generator is rotated 180 degrees and when the generator, rec- tifier
47、 and control unit are inclined as specified in 3.2.8. Control units enclosures shall be of the totally enclosed type so that water sprayed on the outside of the enclosure will not enter the enclosure and cause maloperation or damage to components. 3.2.14 Maximum temperature rises for various parts (
48、based on 122F ambient) shall be as specified in table II, 3,2.15 Radio interference reduction. - 3.2.15.1 All battery chargers shall be designed to produce minimum conducted and radiated radio interference within the frequency range of 150 kilo- cycles and 20 megacycles without use of radio inter- f
49、erence suppression filters or capacitors. The fol- lowing design features shall be considered to reduce radio interference: (a) Largest practical number of armature coils and commutator bars. (b) Shallow armature slots. (c) Short pitch armature windings. (d) Minimum eccentricity of cornmutateril Bnd collector rings. (e) Balanced design to eliminate Ethdt eurrenge without the use of auxiliary bruehes. 3.2.15.2 When the contract or order (see 6.1) re- quires battery chargers to meet the requirements ne MIL-1-1691
