1、AMSC N/A FSC 5963 MIL-DTL-62545E 15 January 2013 SUPERSEDING MIL-DTL-62545D 25 October 2007 DETAIL SPECIFICATION MODULE, STANDARD ELECTRONIC CONTROL This specification is approved for use by all Departments and Agencies of the Department of Defense. 1. SCOPE 1.1 Scope. This specification covers the
2、Module, Standard Electronic Control (MSEC), a component of Halon 1301 fire extinguishing systems used in military vehicles. The MSEC continuously monitors the system condition. Upon receipt of a fire signal, it issues crew warning and extinguisher discharge commands. 2. APPLICABLE DOCUMENTS 2.1 Gene
3、ral. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completene
4、ss of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3 and 4 of this specification, whether or not they are listed. 2.2 Government documents. 2.2.1 Specifications, standards, and handbooks. The following specifications, standards
5、, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. COMMERCIAL ITEM DESCRIPTIONS A-A-52557 - Fuel Oil, Diesel, for Posts, Camps, and Stations. DEPARTMENT OF DEFENSE SPE
6、CIFICATIONS MIL-PRF-62546 - Sensor, Fire, Optical. MIL-DTL-62547 - Valve and Cylinder Assemblies, Halon 1301. DEPARTMENT OF DEFENSE STANDARDS MIL-STD-130 - Identification Marking of U.S. Military Property. MIL-STD-171 - Finishing of Metal and Wood Surfaces. MIL-STD-461 - Requirements for the Control
7、 of Electromagnetic Interference, Characteristics of Subsystems and Equipment. MIL-STD-810 - Environmental Engineering Considerations and Laboratory Tests. MIL-STD-1275 - Characteristics of 28 Volt DC Electrical Systems in Military Vehicles. MS3114 - Connectors, Receptacle, Electrical, Series 1, Sol
8、der Type, Jam Nut Mounting, Bayonet Coupling, Classes E, F, H and P. METRIC Comments, suggestions or questions on this document should be addressed to DLA Land and Maritime, ATTN: VAT, Post Office Box 3990, Columbus, OH 43218-3990, or emailed to Tubesampsdla.mil. Since contact information can change
9、, you may want to verify the currency of this address information using the ASSIST Online database at https:/assist.dla.mil. Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62545E 2 MS3121 - Connectors, Plug, Electrical, Crimp Type, Cable-Con
10、necting, Bayonet Coupling, Series 1, Classes E, F and P. MS3474 - Connectors, Receptacle, Electrical, Series 2, Crimp Type, Rear Mounting Jam Nut, Bayonet Coupling, Classes A, D, L, T, W and Z. (Copies of these documents are available online at https:/assist.dla.mil/quicksearch or from the Standardi
11、zation Document Order Desk, 700 Robbins Avenue, Building 4D, Philadelphia, PA 19111-5094.) 2.2.2 Other Government documents, drawings, and publications. The following other Government documents, drawings, and publications form a part of this document to the extent specified herein. Unless otherwise
12、specified, the issues are those cited in the solicitation or contract. DRAWINGS ARMY (TACOM) 12343265 - Connector, Electrical Receptacle. 12370459 - Module, Standard Electronic Control. PUBLICATIONS TEST PROCEDURES (TACOM) Nuclear Survivability - Nuclear Survivability Criteria for the Automatic Fire
13、 Extinguishing System (AFES) (U). Document is classified “Confidential“. (Copies are available from Department of the Army, United States Army Tank-Automotive and Armaments Command, 6501 E. 11 Mile Road, Warren, Michigan 48397-5000 or by e-mail usarmy.detroit.rdecom.mbx.tardec-standardizationmail.mi
14、l ) 2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract. AMERICAN SOCIETY FOR TESTING AND MATERIALS (ASTM) INTERNATIONAL ASTM-G2
15、1 - Materials to Fungi, Synthetic Polymeric, Determining Resistance of. (Copies of these documents are available online at http:/www.astm.org/ or from ASTM INTERNATIONAL, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959.) 2.4 Order of precedence. Unless otherwise noted herein or in the contra
16、ct, in the event of a conflict between the text of this document and the references cited herein (except for related specification sheets), the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been o
17、btained. 3. REQUIREMENTS 3.1 First article inspection. MSECs furnished under this specification shall be products which are capable of meeting all first article inspection requirements specified herein (see 4.3). 3.2 Materials. Materials used shall be as specified herein and as specified in referenc
18、ed specifications, standards, and drawings. Materials shall be free of defects which adversely affect performance or serviceability of the finished product. Materials shall be suitable for use over an ambient temperature range from -51 to +71 degrees Celsius (C) (-60 to +160 degrees Fahrenheit (F).
19、There shall be no changes in physical or dimensional characteristics that could result in the operation of the MSEC falling outside the limits specified herein (see 4.6.1). Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62545E 3 3.2.1 Dissim
20、ilar metals. Except where necessary to complete an electrical circuit, contact between dissimilar metals, which could encourage galvanic action, shall be avoided. Separation of dissimilar metals shall be accomplished by providing approved protective finishes, coatings, or insulation between the mati
21、ng materials and shall be in accordance with provisions of MIL-STD-171 which address reduction of corrosion at intermetallic contact points. Corrosion-resistant materials shall be used whenever possible (see 4.6.1). 3.2.2 Encapsulation. Encapsulation (if used) shall be silicone rubber compound to pe
22、rmit removal for repair (see 4.6.1). 3.2.3 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or environmentally preferable materials should be used to the maximum extent possible provided that the material meets or exceeds the operational and maintenance requirements
23、 and promotes economically advantageous life cycle costs. All components supplied shall be new and unused. 3.2.4 Pure tin. The use of pure tin as an underplate or final finish is prohibited both internally and externally. Tin content of the standard electronic control module components and solder sh
24、all not exceed 97 percent, by mass. Tin shall be alloyed with a minimum of 3 percent lead, by mass (see 6.8). 3.3 Design and construction. The MSEC shall be designed to monitor and control fire extinguishing systems consisting of the following components: a. One MSEC. b. One to four Halon 1301 fire
25、extinguishers in accordance with MIL-DTL-62547. c. One to four optical fire sensor assemblies (OFSA) in accordance with MIL-PRF-62546. d. Built-in-test-equipment (BITE) (integral with above components). e. Test and alarm panel. f. Interconnecting electrical harnesses. The MSEC shall issue signals up
26、on receipt of the following data: a. Report of system condition from the BITE. b. Report of extinguisher availability. c. A fire signal from an OFSA or from the test and alarm panel. A large fire signal, which may originate from an OFSA or the test and alarm panel, shall cause the MSEC to drive exti
27、nguisher discharge, activate visible and audible fire warnings, and power a ventilation fan relay. In response to a small fire signal from an OFSA(s), the MSEC shall only activate warnings. Loss of continuity in extinguisher circuits shall cause the MSEC to activate extinguisher status lamps. The MS
28、EC shall not be involved in OFSA decisions respecting the nature and origin of fires and false alarms. The MSEC shall communicate system condition between BITE and the test and alarm panel. Operating temperature range shall be -51 to +71C (-60 to +160F) (see 4.6.1). 3.3.1 Activation sequence The MSE
29、C shall monitor the availability of, and shall activate, extinguishers as specified herein. The order of priority of the extinguishers shall be 1 (highest), 2, 3, and 4. Extinguishers shall be considered available when pressure/flow switch and solenoid continuities are sensed by the MSEC (see 3.4.5
30、and table I). Within 2 milliseconds (ms) of receipt of a large fire signal from an OFSA or an electrical-manual activation signal, the MSEC shall apply extinguisher drive signals to the two highest priority available extinguishers. An extinguisher shall not be considered available for 8 to 10 second
31、(s) after the MSEC has supplied a drive signal to it. If flow indications are not received within 38 ms of the start of the drive signal for either or both of the extinguishers chosen initially, the MSEC shall provide automatic back-up (see 6.4.3) to select and apply drive signals to the next highes
32、t priority extinguisher(s) and check its flow in turn. After the MSEC begins extinguisher activation, it shall ignore OFSA large fire signals for 0.5 second and electrical-manual activation signals for 4 to 6 seconds. If the Provided by IHSNot for ResaleNo reproduction or networking permitted withou
33、t license from IHS-,-,-MIL-DTL-62545E 4 MSEC finds no available extinguishers at a time when a large fire signal is present, it shall sequentially apply an extinguisher drive signal to each extinguisher (with not more than 2 ms between consecutive drive signals). This is done on the possibility that
34、 extinguishers indicated as unavailable may, in fact, be usable. The MSEC shall not apply subsequent drive signals until extinguisher availability is again indicated (see figure 1 and 4.6.3). TABLE I. Electrical signal characteristics. 1/ 2/ Symbol Signal A Logic 10 V dc to 30 V dc Source output imp
35、edance 2,000 3/ Load input impedance 20,000 4/ Quiescent conditions: 1 V dc maximum Input impedance (source and load) 20,000 B Extinguisher drive 16 V dc to 30 V dc 10 A minimum for load impedance 1.3 20 A maximum Total load impedance: 0.5 to 2.3 Quiescent condition: See signal C C Continuity monito
36、ring 5 mA maximum Source input and output impedance 20,000 Total load impedance: 2.3 D Lamp drive 16 V dc to 30 V dc Source input impedance 20,000 Load impedance 750 Quiescent condition: 1 V dc maximum Source input and output impedance 20,000 1/ All outputs shall be capable of withstanding short cir
37、cuits of indefinite duration. 2/ Whenever a range of values is specified for an input signal or input duration, the component shall be capable of meeting all requirements at any point within the specified range. 3/ Less than or equal to (). 4/ Greater than or equal to (). Provided by IHSNot for Resa
38、leNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-62545E 5 NOTE: Either a large fire signal from any OFSA(s) or an electrical-manual activation signal shall be considered a fire signal. FIGURE 1. Extinguisher activation logic. Provided by IHSNot for ResaleNo reproduction
39、 or networking permitted without license from IHS-,-,-MIL-DTL-62545E 6 3.3.2 Warning signals. The MSEC shall provide fire warning signals for small and large fires as follows (see 4.6.3). 3.3.2.1 Fire signals. Upon receipt of a signal from the OFSA for a small threshold fire, the MSEC shall energize
40、 the fire warning lamp and an audible fire warning signal without activating the extinguisher drive signals. A large fire signal occurring while a small fire signal is present shall energize the fire warning lamp, the audible fire warning signal, and the appropriate extinguisher drive signals. The f
41、ire warning circuit shall not lock in the energized position (see table II) (see 4.6.3). 3.3.2.2 Extinguisher status. The MSEC shall energize four extinguisher status lamps, one for each extinguisher. These lamps, when energized, shall indicate a continuity break, low extinguisher pressure or that e
42、xtinguishant flow has occurred. Continuity loss shall not render the remainder of the system inoperative (see table II and table III) (see 4.6.3). 3.3.3 BITE. The MSEC shall incorporate BITE capability which conducts to a total electronic check as specified in 3.4.6. A fault signal detected in an OF
43、SA shall cause signals from that unit to be ignored, and the remainder of the system shall be operative (see 4.6.3). 3.3.4 Configuration. The MSEC shall conform physically and dimensionally to Drawing 12370459 (see 4.6.1 and 4.6.2). 3.3.5 Connector receptacles. The MSEC shall electrically interface
44、with fire extinguishing systems through the connector receptacles called out on Drawing 12370459 and as specified below (note: MS3474, MS3121 and MS3114 are inactive for new design). The MSEC internal wiring to the connectors shall provide for its function in, and interface with, the vehicle and fir
45、e extinguishing system as follows (see 4.6.1, 4.6.2, and 4.6.3). a. MSEC connector J1: MS3474 W22-21PN, MS3121 W22-21PN, MS3114 W22-21PN or 12343265-2. b. MSEC connector J2: MS3474 W22-21SN, MS3121 W22-21SN, MS3114 W22-21SN or 12343265-3. c. MSEC connector J3: MS3474 W18-32SN , MS3121 W18-32SN, MS31
46、14 W18-32SN or 12343265-4. 3.3.5.1 Receptacle J1. Receptacle J1 shall communicate with the test and alarm panel, vehicle power, the fire warnings, and the ventilation fan. It shall be wired for the signal assignments shown in table II (see 4.6.3). 3.3.5.2 Receptacle J2. Receptacle J2 shall communica
47、te with the extinguishers. Receptacle J2 wiring shall be compatible with the four extinguisher harness variations described on figure 2, and shall provide the signal assignments shown in table III (see 4.6.3). 3.3.5.3 Receptacle J3. Receptacle J3 shall communicate with the OFSAs. Receptacle J3 wirin
48、g shall be compatible with the four OFSA harness variations described on figure 3, and shall provide the signal assignments shown in table IV (see 4.6.3). 3.3.6 Electrical signals. The MSEC shall receive and transmit logic information and commands in the form of the four signals described in table I
49、. The MSEC shall withstand signal short circuits of indefinite duration, and shall perform as specified within all indicated signal value ranges (see 4.6.3). 3.3.7 Extinguishing shots. The MSEC shall function as specified in either one or two shot systems without adjustment (see 4.6.3 and 6.4.4). 3.3.8 Component removal/replacement. Upon removal or replacement of any component, automatic
