1、AECMA PRENx2349 95 m 1012311 0003276 044 - Edition approved for publication 1995-04-28 AECMA STANDARD NORME AECMA AECMA NORM Comments should be sent within SIX months after the date of publication to AECMA Technopolis - 175, rue Jean-Jacques Rousseau 921 38 Issy-les-Moulineaux Cedex - FRANCE prEN 23
2、49 Edition P 1 April 1995 EDIT PAR LASSOCIATION EUROPENNE DES CONSTRUCTEURS DE MATRIEL AROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cedex - Tl. (1) 47.36.98.76 ICs : I, Descriptors : ENGLISH VERSION Aerospace series Requirements and test procedures for switch
3、ing devices Srie arospatiale Exigences et mthodes dessais des appareils de commutation Luft- und Raumfahrt Anforderungen und Prfverfahren fr Schaltelemente This *Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Aros
4、patial). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned Technical Committee following comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an
5、extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Officiai Services of the Member countries it will be submitted as a draft Europea
6、n Standard to CEN (European Committee for Standardization) for formal vote. Nota - Extra coptes can be supplied by B N A E - Technopolis 54 - 199. rue Jean-Jacques Rousseau - 921 38 ISSY-LES-MOULINEAUX CEDEX C 2 Chairman M. Le Cunff aecma 1995 Copyright Association Europeene des Constructeurs de Mat
7、eriel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 2 prEN 2349: 1 995 Contents list 1 Scope 2 Normative references 3 Definitions 4 Characteristics 5 Specifications and test procedures 6 Qualification 7 Ver
8、ification tests 8 Batch acceptance 9 Periodic tests to maintain qualification Page 3 3 4 4 5 30 32 33 34 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-
9、,-AECMA PREN*:2349 95 LOL23LL O009278 917 Page 3 prEN 2349: 1995 1 Scope This standard specifies the requirements and test procedures of switching devices for use in aircraft electrical systems to EN 2282. 2 Normetive references IS0 2669 Environmental tests for aircraft equipment - Part 3.2 : Steady
10、 state acceleration IS0 2678 Environmental tests for aircraft equipment - Insulation resistance and high voltage tests for electrical equipment IS0 2859-1 Sampling procedures for inspection by attributes - Part 1 : Sampling plans indexed by acceptable quality level (AQL) for lot-by-lot inspection IS
11、0 71 37-1 987 Aircraft - Environmental conditions and test procedures for airborne IEC 68-2-1 7 EN 2242 EN 2282 EN 2591 EN 259 1-303 EN 2591-315 EN 2591-409 EN 2591-41 2 EN 2591-415 EN 2591-417 EN 2591-418 EN 3042 EN 3155-001 EN 4232 equipment - Endorsement of publications EUROCAE/ED-l4B and RTCA/DO
12、- 160B (revisions of EUROCAE/ED 14A and RTCA/DO-l60A) Environmental testing - Part 2 : Tests - Test Q : Sealing Aerospace series - Control of tools used for crimping of electric cables with conductors defined by EN 2083 and EN 2346 l) Aerospace series - Characteristics of aircraft electrical supplie
13、s Aerospace series - Elements of electrical and optical connection - Test methods - General Aerospace series - Elements of electrical and optical connection - Test methods - Part 303 - Cold/low pressure and damp heat Aerospace series - Elements of electrical and optical connection - Test methods - P
14、art 31 5 - Fluid resistance l) Aerospace series - Elements of electrical and optical connection - Test methods - Part 409 - Contact retention in insert Aerospace series - Elements of electrical and optical connection - Test methods - Part 41 2 - Contact insertion and extraction forces Aerospace seri
15、es - Elements of electrical and optical connection - Test methods - Part 41 5 - Test probe damage (female contact) l) Aerospace series - Elements of electrical and optical connection - Test methods - Part 41 7 - Tensile strength (crimped connection) l) Aerospace series - Elements of electrical and o
16、ptical connection - Test methods - Part 418 - Gauge insertion and extraction forces in a female contact 1 Aerospace series - Quality assurance - EN aerospace products - Qualification procedure Aerospace series - Electrical contacts used in elements of connection - Part O01 - Technical specification
17、Aerospace series - Contactors - Terminal strength 2, 1) Published as AECMA Prestandard at the date of publication of this standard 2) In preparation at the date of publication of this standard Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license wit
18、h AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 4 prEN 2349: 1995 3 Definitions For the purpose of this standard, the following definitions apply : Switching devices : relays with plug-socket holders and/or contactors. The switching devices are designed
19、 for the rated voltage specified. All test voltages are related to the rated voltage specified. “1, The switching devices are designed for the rated current specified, related to a resistive load. Data relating to currents and voltages : unless otherwise stated, all data on a.c. values are effective
20、 values. A no load circuit is any combination of loads up to 10 mA, 50 mV. 4 Characteristics 4.1 Construction 4. I. 1 Metal parts All metal parts used in the construction of switching components shall be resistant to or protected against corrosion. Dissimilar metals which are in direct contact shall
21、 be protected against electrochemical corrosion. 4.1.2 Insulants w Insulants shall be of non-inflammable or self-extinguishing materials and shall not emit any noxious or explosive vapours which could cause an explosion. In addition, the insulating materials shall be resistant to mould. Insulating m
22、aterials and protective coatings which may possibly break, crack or splinter shall not be used. 4.1.3 Leakage current paths The leakage paths between live parts which are insulated from each other shall be such that no arcing or other damage arising from the application or from environmental conditi
23、ons can occur. 4.1.4 Mounting Mounting of the switching devices shall conform to the product standard Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-A
24、ECIA PREN*2349 95 = 1012311 0009280 575 Page 5 prEN 2349: 1995 4.2 Description 4.2.1 Function The switching devices shall be designed for rated voltages to EN 2282. They shall be designed in such a way that they will switch the contact loads described in product standards without failure throughout
25、their service life. The environmental conditions required-shall in no way lead to impairment or reduction of performance of the switching device. The product standards shall state that switching devices with changeover contacts suitable for changing over the loads of unrelated a.c. circuits. 4.2.2 E
26、lectrical connections 4.2.2.1 Relays and contactors I, the the are The construction, form and surface characteristics of the contact pins shall comply with the requirements of the product standard. 4.2.2.2 Plug-socket holders The construction, form and function of the socket shall comply with the re
27、quirements of the product standard. The plug-socket holder shall be provided with a suitable holding device to ensure fit and retention of the socket contact. The socket contact shall be designed so that the electric wiring specified in the product standards can be connected. The contact connections
28、 of relays and plug-socket holders shall comply with the electrical and mechanical requirements of the product standards. 4.2.2.3 Earth connections Mounting of the switching devices shall provide a perfect physical connection with the housing of the switching device. 4.2.2.4 Type designation See pro
29、duct standard. 5 Requirements and test procedures 5.1 General requirements The switching device shall meet the requirements of the product standard. Relays with plug-socket holders shall be regarded as a unit. 5.1 .I Normal environmental conditions for tests Ambient temperature : (23 I 5) OC (unless
30、 otherwise specified): Pressure : 84 kPa to 1 06 kPa; Relative humiditv : 45 % to 75 %. 5.1.2 Electric wiring 5.1.2.1 Relays with plug-socket holders For qualification testing the wiring specified in the product standards shall be used. Copyright Association Europeene des Constructeurs de Materiel A
31、erospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AECMA PRENx2349 95 LOL23LL 0009283 40L 16 12 Page 6 prEN 2349: 1995 13,5 k 0,5 110 135 5.1.2.2 Contactors For qualification testing, wiring suitable for the contact l
32、oads specified shall be used. 5.1.3 Sockets Sockets contatts shall be in accordance with EN 31 55-001. 5.2 Functional characteristics 5.2.1 Visual inspection Visual inspection shall be carried out to ensure that the materials, construction, make-up, marking and finishing comply with the specificatio
33、ns. The visual inspection shall be carried out with the naked eye only. 5.2.2 Dimensions Tests shall be carried out to ensure that dimensions and weight conform to the requirements of the product standard. 5.2.3 Strength of connections 5.2.3.1 Relays with plug-socket holder Contact pins Test procedu
34、re The contact pins shall be tested with a force in compliance with the product standard in the axial direction related to the connector pin, for a period of 15 s to 30 s. w Test criteria No sign of loosening, breakage of the pins, crack formation or splitting of the insulating material nor any othe
35、r damage shall be visible which would impair the function of the relay within the limit values prescribed. Verification test : A (see table 6) 5.2.3.2 Retention of socket in insert Test procedure The test shall be carried out in accordance with EN 2591-409. For preloads see table 1. Table 1 Preload
36、Test load Socket size t0,5 A Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- AECMA PREN*k2349 95 LOL23LL 0009282 348 P Socket size AWG l) Page 7 prEN
37、2349:1995 Wire size Insertion force Extraction force AWG l) max. max. - N N Test criteria The change in position of the socket during and/or after the application of the force shall not be greater than 0,3 mm. There shall be no visible sign of damage. Socket size AWG 1 20 16 12 5.2.3.3 +trength of a
38、ttachment bolts Insertion force Extraction force Test pin diameter Bending moment N N mrn max. max. -t 0,Ol N.cm 5,1 0,20 1 ,o2 5,7 8,5 0,60 1,59 5,7 8,5 0,85 2,39 22,7 Test procedure The relay and plug-socket holder shall be attached to the mounting plate at the torque specified in the product stan
39、dard. Test criteria The plug-socket holder shall withstand one and a half time the torque value specified in the product standard. There shall be no damage to the plug-socket holder or the relay. 5.2.3.4 Contact insertion and extraction forces Test procedure The test shall be carried out in accordan
40、ce with EN 2591-41 2. For insertion and extraction tools see product standard. See table 2. Table 2 11 1 AWG : Closest American Wire Gage I Test criteria The values shown in table 2 shall not be exceeded. 5.2.3.5 Contact flexibility and resistance to elongation Test procedure The test shall be carri
41、ed out in accordance with EN 2591-415. See table 3. Table 3 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- AECMA PRENr2349 95 1012311 0009283 284 Pag
42、e 8 prEN 2349: 1995 Test criteria Verification tests shall be carried out in accordance with EN 2591 -41 8. 5.2.3.5 Crimping of socket Test procedure The connecting wires shall be crimped on the sockets using a tool as specified in the product standard . The test shall be carried out in accordance w
43、ith EN 2591 -41 7. Test criteria The test for tensile strength shall be carried out in accordance with EN 2242. 5.2.3.6 Contactor Test procedure The test shall be carried out to EN 4232. Tightening torque : see product standard. Test criteria The contact bolts shall not loosen and the lead-through s
44、hall not be damaged. 5.3 Mechanical tests 4m For bistable switching devices the coil voltage shall be switched off after selection. For test conditions, see product standard. Half the tests shall be carried out in each of the switching positions. 5.3.1 Vibration, sinusoidal Mounting method Mounting
45、of the switching device on the vibrator table shall be rigid, so that the vibrations produced can be transmitted directly to the test sample without absorption or resonance. The electrical connections shall be wired in accordance with 5.1. The wires shall be secured to the vibrator as close as possi
46、ble to the point of electrical connection. Test procedure The switching device shall be subjected to a vibration test to IS0 71 37. For test conditions, see product standard. Test criteria The torque for the connections and attachments shall not be less than 80 YO of the rated value. No opening of c
47、losed contacts for longer than 10 ps. No closing of open contacts for longer than 1 ps. Verification tests : B, C, D, F, G, J and K (see table 6). 1 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or netw
48、orking permitted without license from IHS-,-,-AECMA PREN*2349 95 10123LL 0009284 110 Page 9 prEN 2349: 1995 5.3.2 Vibration, non-sinusoidal Mounting method Mounting of the switching device on the vibrator table shall be rigid so that the vibrations produced,are transmitted directly to the test sampl
49、e without absorption or resonance. The electrical connections shall be wired in accordance with 5.1. The wires shall be secured to the vibrator as close as possible to the point of electrical connection. Test procedure The switching device shall be subjected to a vibration test to IS0 71 37. For test conditions see product standard. Test criteria The torque for the connections and attachments
