1、MIL-R-23761B 1 October 1975 SUPERSEDING MIL-R-237 6 1A (AS) 16 May 1974 MILITARY SPECIFICATION REGULATORS, VOLTAGE, AND CONTROL PmLS AIRCRAFT DIRECT CURRENT GENERATOR, GENERAL SPECIFICATION FOR This specification is approved for use by all Depart- ments and Agencies of the Department of Defense. 1.
2、SCOPE Scope - This specification covers solid state direct current voltage regulators or control panels used to regulate, control and protect aircraft engine driven direct current generators. - 1.1 . * 1.2 Classification - The regulators and control panels shall be of the following classes as specif
3、ied: Class A - Regulators and control panels that are operable under the temperature and altitude conditions of Curve II of MS33543. Class B - Regulators and control panels that are operable under the temperature and altitude conditions of Curve I of MS33543 to a maximum temperature of 85OC. Class C
4、 - Regulators and control panels that are operable under the temperature and altitude conditions of Curve I of MS33543. 2. APPLICABLE DOCUMENTS 2.1 The following documents, of the issue in effect on date of invitation for bids or request for proposal, form a part of this specification to the extent
5、specified herein. SPECIFICATIONS Federal QQ-P-416 Plating, Cadmium (Electrodeposited) THIS DOCUMENT CONTAINS 06 PAGES: Licensed by Information Handling ServicesMIL-R-237bLB bL 7777706 00887Y7 I MIL-R-23761B SPECIFICATIONS Military MIL-P-116 MIL-D-1000 MIL-M-3i 7 1 MIL-E-5400 MIL-C-5541 MIL-G-6 162 M
6、IL-S-7742 MIL-A-8625 MIL-S-8879 MIL-P-15 O24 STANDARDS Military MIL-STD-129 MIL-STD-130 MIL-STD-143 MIL-STD-454 2 Preservation-Packaging, Methods of Drawings, Engineering and Associated Lists Magnesium Alloy; Processes for Pretreatment and Prevention of Corrosion on Electronic Equipment, Airborne, G
7、eneral Specification for Chemical Conversion Coatings on Aluminum and Aluminum Alloys Generator, 30 Volts, Direct Current, Aircraft Engine Driven, General Specifi- cation for Screw Threads, Standard, Optimum Selected Series, General Specification for Anodic-Coatings, for Aluminum and Aluminum Alloys
8、 Screw Threads, Controlled Radius Root with Increased Minor Diameter, General Speci- fication for Plate, Tags and Bands for Identification of Equipment Marking for Shipment and Storage Identification Marking of U.S. Military Property Standards and Specifications, Order of Precedence for the Selectio
9、n of Standard General Requirements for Elec- tronic Equipment Licensed by Information Handling ServicesMIL-R-23761B STANDARDS Military (Continued) MIL-STD-461 MIL-STD-462 MIL-STD-749 Electromagnetic Interference Character- istics Requirements for Equipment Electromagnetic Interference Character- ist
10、ics, Measurement of Preparation and Submission of Data for Approval of Non Standard Parts MIL-STD-781 Reliability Tests: Exponential Distribution MIL-STD-794 ,Parts and Equipment, Procedures for Packaging and Packing of MIL-STD-810 Environmental Test Methods MIL-STD-889 DissimiAar Metals MS33543 Cri
11、teria Temperature and Altitude Range Self-Cooled Electric Equipment PUBLICATIONS NAVAIR AR (Aeronautical Requirements) AR-8 AR-9 AR-10 Versatile Avionics Shop Test System/ Avionics System Compatibility, General Requirements for Test Program Sets, General Require- ments for Maintainability of Avionic
12、s Equipment and Systems, General Requirements for (Copies of specifications, standards, drawings, and publications required by supplies in connection with specific procurement functions should be obtained from the procuring activity or as directed by the contracting officer). 3. REQUIREMENTS 3.1 Qua
13、lification - The regulator or control panel furnished under this specification shall be a product which has been tested and passed the qualification tests specified herein and has been approved for listing on the applicable qualified products list. 3 Licensed by Information Handling ServicesMIL-R-23
14、7bLB bL m 9999906 0088349 5 W MIL-R-23761B 3.2 Specification sheets - The individual regulator or control panel requirements shall be as specified herein and in accordance with the applicable detail specification sheet. In the event of any con- flict between requirements of this specification and th
15、e detail specification sheet, the latter shall govern. * 3.3 Design and construction - The voltage regulator or control panel shall conform to the requirements specified on the appli- cable detail specification sheet and this specification: lator shall be completely solid state and shall have no mov
16、ing parts. Component parts, design and construction shall enable the regulator or control panel to have a minimum shelf life of five years. reliability requirements shall be met after storage. or.contro1 panel shall not use any liquid, gas or vacuum, or device which depends upon elevated temperature
17、 for operation. The voltage regu- Performance and The voltage regulator 3.3.1 Materials - Materials shall be of a corrosion resist- ant type or suitably processed to resist corrosion. 3.3.1.2 Dissimilar metals - Dissimilar metals, as defined by MIL-STD-889, shall not be used in contact with each oth
18、er. contact is unavoidable, the metals shall be protected against electrolytic corrosion. When protection is used, it shall be of such a type that a low impedance path is offered to radio frequency currents. Where such 3.3.1.3 Non-metallic materials - Non-metallic materials used including plastics,
19、fabrics, and protective finishes shall be moisture re- sistant and shall not support fungus growth. ly affected by weather, sunlight, aircraft fluids, temperatures, and ambient conditions encountered during operation of the aircraft. Materials shall.not be adverse- 3.3.1.4 Flammable materials - Mate
20、rials which will support combusion shall not be used. Definitions and restrictions on the use of flammable materials sliall be in accordance with MIL-STD-454 Requirement 3. 3.3.2 Finish - 3.3.2.1 Aluminum alloy parts - Aluminum alloy parts shall be anodically treated in accordance with MIL-A-8625 or
21、 shall receive an approved chemical film in accordance with requirements of MIL-(2-5541. deposited by these treatments shall be removed from the actual contact area of all surfaces required to act as a path for electrical power and from the localareas under screws, nuts, or the like used for assembl
22、y or mounting purposes, to provide an adequate bonding connection. The films 3.3.2.2 Magnesium alloy parts - Magnesium alloy parts shall not be used without approval of the procuring activity, use magnesium alloy parts shall be surface treated in accordance with MIL-M-3171 to provide protection agai
23、nst corrosion. When approved for 4 1 “- Y, - I. . : 5% G Licensed by Information Handling ServicesMIL-R-237bIB 61 7777906 0088750 I E MIL-R-23761B 3.3.2.3 QQ-P-416, Plating - Cadmium plating shall be in accordance with 3.3.3 Parts, materials, and processes - 3.3.3.1 Use of standard parts - Standard
24、parts shall be used wherever they are suitable for the fulfilment of the design objectives and shall be identified on drawings by their standard part number. 3.3.3.2 processes shall be selected trom documents which are specified as standards in MIL-E-5400, Where there is no suitable document specifi
25、ed in MIL-E-5400 the contractor shall use other specifications,standards and drawings selected in the order of precedence set forth in MIL-STD-143. Parts, maherials, and processes selected from other than those covered by documents specified in MIL-E-5400 are not considered standard and nonstandard
26、part approval must be obtained prior to their use in the regulator or control panel. Selection of standard parts - Payts, materials, and 3.3.3.3 Approval of nonstandard parts - Requests for approval of nonstandard parts shall be in accordance with MIL-STD-749. The activity responsible for reviewing
27、requests for approval of nonstandard parts is the Qualifying Activity. 3.3.3.4 Commercial utility parts - Commercial utility parts such as screws, bolts, nuts and cotter pins may be used without approval provided they possess- suitable properties and are replaceable by standard parts, without altera
28、tion. The corresponding standard part numbers shall be referenced in the parts list and on the drawings. 3.3.4 Screw threads - Screw threads shall conform to MIL-S-7742. For applications requiring high strength capability, threads conforming to MIL-S-8879 shall be used, 3.3.5 Interchangeability - Al
29、l parts having the same manu- facturercs part number shall be directly and completely interchangeable with each other with respect to installation and performance. manufacturers part numbers shall be governed by the drawing number require- ments of MIL-D-1000. Changes in 3.3.6 Simplicity - A design
30、objective shall be the use of the same parts for as many applications as possible. 3.3.7 Safety wiring and staking - Accidental loosening of screws and screw parts and other connections shall be prevented by safety wiring(0.032-inchminimm outside diameter, where practical), staking, or other approve
31、d methods. Washers and cotter pins, where used, shall be assembled in a manner which prevents rotation of washers and movement of cotter pins under conditions of vibration, 5 Licensed by Information Handling ServicesMIL-R-237bLB bL 77777Ob 0088751 3 m MIL-R-23761B * 3.3.8 Electrical connections and
32、wiring - * 3.3.8;l Electrical connections - Aluminum studs and washers shall not be used for regulator or control panel connections. connections of the voltage regulator shall be as shown in Figure 1. regulator shall be constructed so that a single regulator can control a single generator with only
33、L+, L-, G+ and F+ terminals connected to the generator. Unless otherwise specified no connection shall be required to any other regulator terminal for this condition of operation. The electrical The * 3.3.8.2 Electrical wiring - Electric wire shall be compatible with the designed maximum operating t
34、emperature of the regulator or control panel. Wiring practices shall be consistent with the intended application. Those circuits which supply control and indication power to the starter or generiztor system shall be protected internally by a diode to prevent power back feed. 3.3.9 Dielectric strengt
35、h - Dielectric strength tests shall be conducted on components and subassemblies, as necessary, before final assembly to determine the partsr ability to meet all specified dielectric requirements. 3.3.9.1 Circuits - Circuits which operate at voltages no greater than 50 volts shall be tested at 500 v
36、olts (rms), 60 Hz for one (1) minute or 600 volts (rms), 60 Hz for one (1) second, Circuits operating in excess of 50 volts dc shall be tested at a minimum of 10 times the nominal rated potential for 1 second. 3.3.9.2 Capacitors - capacitors shall be tested for one minute at a voltage equal to twice
37、 the voltage and at the pulse repetition rate expected to be encountered in the intended application (see paragraph 6.3.1). . 3.3.10 Operating position - The regulator or control panel shall be capable of operating in any position. 3.3.11 Size and weight - The physical dimensions, weight, and envelo
38、pe configuration shall be as specified in the detail specification sheet. 3.3.12 Provisions for maintainability * (Applicable to Navy Procurements) Built-Inaand packaging, and provisions for test points shall be as specified in AR-10 excluding section 3.3. Equipment shall be compatible with VAST (Ve
39、rsatile Automatic Shop Test System) and shall meet the requirements of AR-8. shall be furnished in accordance with AR-9. If changes to the equipment are made which will affect the fault diagnosis procedure, changes to the existing Test Program shall be prepared as part of the equipment changes in ac
40、cordance with AR-9. VAST Test Programs 6 Licensed by Information Handling ServicesMIL-R-23761B MIL-R-23761B bL 9779906 0088952 5 POSITIVE BUS REGULATING POINT TO EQUALIZER BUS -1 I 1 l I - I I I 1 VOLTAGE SENSING CIRCUIT WITH VOLTAGE SETTING POTENTIOMETER I VOLTAGE REGULATOR i L - - - - NOTES 1. FOR
41、 SINGLE GENERATOR SYSTEMS NO CONNECTION SHALL BE REQUIRED TO THE EG AND EB TERMINALS - 1 2. TERMINAL “O“ IS FOR TEST PURPOSES ONLY, AND NO CONNECTION IS MADE , - TO IT DURING NORMAL OPERATION - NEGATIVE BUS Figure 1 - Voltage Regulation Schematic Wiring Diagram 7 Licensed by Information Handling Ser
42、vicesMIL-R-237bLB bL 97797Ob 0088953 7 MIL-R-23761B 3.3.13 LMarking - Regulator and control panel subassemblies shall be marked with the manufacturers part number. accordance with ML-STD-130. Markings shall be in 3.3.13.1 contain a standard size type A, By or H metal nameplate in accordance with MIL
43、-P-15024, securely attached to the unit, the following information. Nameplate - All regulators and control panels shall The nameplate shall contain Abbreviations are permissible. As Applicable Regulator, Voltage D.C. Generator Control Panel D.C, Generator Volts and Field Amperes (as specified on Mil
44、itary Part No, Manufacturers Part No. or Model No. Manufacturers Name or Trademark Serial No. Federal Stock No. Date of Manufacturer Acceptance Stamp Part number on nameplate - The manufacturers part applicable drawing) 3.3.13.1.1 number indicated on the nameplate shall be the number of the contract
45、ors assembly drawing which includes subassembly ordering data, 3.3.13.1.2 Restriction on size of trademark - The manufacturers name or trademark shall be in letters not larger than other letters appearing on the nameplate. 3.3.13.2 Terminal marking - Terminal marking shall be clear and visible, and
46、shall be in accordance with the detail specification sheet. Terminal protective covers, when installed, shall not obscure the terminal markings, 3.3.14 Use of MS or MIL designations - MS or MIL designations shall not be applied to a product, nor referred to in correspondence of sales material, until
47、 notification has been received that the product has been approved or use. 3.4 Performance - * 3.4.1 Pulse width - Regulators controlling the voltage of generators through pulse width modulation of the field voltage shall have a minimum pulse width less than a 15 percent duty cycle and a maximum pul
48、se width capable of producing the specified overload field current, The tran- sition from minimum to maximum pulse width shall be smooth and stable and shall not cause modulation or fluctuations of the regulated voltage. 8 Licensed by Information Handling Servicesf 3*4.2 Buildup - The regulator shal
49、l be capable of effecting generator buildup under the conditions specified herein when furnished with a minimiiai resfdual voltage of 0.65 volt, 3.4.3 Voltage regulation - Unless otherwise specified, volt- age regulation shall be accomplished through pulse width.modulation of the field voltage pulse, from a duty cycle of 5 percent to specified overload current. ramping of the generated voltage, The modulated field pulse shall not cause excessive ripple or 3.4.4 Voltage setting - Unless otherwise specified, the voitage regulator shall be designed and constructed
