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 Page 2 prEN 2349: 1 995 Contents list 1 Scope 2 Normativ
7、e references 3 Definitions 4 Characteristics 5 Specifications and test procedures 6 Qualification 7 Verification tests 8 Batch acceptance 9 Periodic tests to maintain qualification Page 3 3 4 4 5 30 32 33 34 AECMA PREN*:2349 95 LOL23LL O009278 917 Page 3 prEN 2349: 1995 1 Scope This standard specifi
8、es 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 state acceleration IS0 2678 Environmental tests for aircraft equipment - Insulation resistanc
9、e 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 IS0 71 37-1 987 Aircraft - Environmental conditions and test procedures for airborne IEC 68-2-1
10、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- 160B (revisions of EUROCAE/ED 14A and RTCA/DO-l60A) Environmental testing - Part 2 : Tests -
11、 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 supplies Aerospace series - Elements of electrical and optical connection - Test methods - General Ae
12、rospace 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 - Part 31 5 - Fluid resistance l) Aerospace series - Elements of electrical and optical connectio
13、n - 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 series - Elements of electrical and optical connection - Test methods - Part 41 5 - Test probe dam
14、age (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 optical connection - Test methods - Part 418 - Gauge insertion and extraction forces in a femal
15、e contact 1 Aerospace series - Quality assurance - EN aerospace products - Qualification procedure Aerospace series - Electrical contacts used in elements of connection - Part O01 - Technical specification Aerospace series - Contactors - Terminal strength 2, 1) Published as AECMA Prestandard at the
16、date of publication of this standard 2) In preparation at the date of publication of this standard 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
17、 designed 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
18、effective 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 cont
19、act shall 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. Ins
20、ulating materials 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 environmenta
21、l conditions can occur. 4.1.4 Mounting Mounting of the switching devices shall conform to the product standard AECIA 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
22、in such a way that they will switch the contact loads described in product standards without failure throughout 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 swi
23、tching devices with changeover contacts suitable for changing over the loads of unrelated a.c. circuits. 4.2.2 Electrical 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
24、standard. 4.2.2.2 Plug-socket holders The construction, form and function of the socket shall comply with the requirements 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 d
25、esigned so that the electric wiring specified in the product standards can be connected. The contact connections 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
26、provide a perfect physical connection with the housing of the switching device. 4.2.2.4 Type designation See product 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 b
27、e regarded as a unit. 5.1 .I Normal environmental conditions for tests Ambient temperature : (23 I 5) OC (unless 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 s
28、pecified in the product standards shall be used. 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 loads specified shall be used. 5.1.3 Sockets Sockets contatts shall be in accordance w
29、ith 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 specifications. The visual inspection shall be carried out with the naked eye only. 5.2.2 Dimensi
30、ons 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 procedure The contact pins shall be tested with a force in compliance with the product stand
31、ard 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 other damage shall be visible which would impair the function of the relay within the lim
32、it 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 Test load Socket size t0,5 A AECMA PREN*k2349 95 LOL23LL 0009282 348 P Socket size AW
33、G l) Page 7 prEN 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.
34、3.3 +trength of attachment 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
35、 the product standard. 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 carrie
36、d out in accordance 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 te
37、st shall be carried out in accordance with EN 2591-415. See table 3. Table 3 - AECMA PRENr2349 95 1012311 0009283 284 Page 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
38、 crimped on the sockets using a tool as specified in the product standard . The test shall be carried out in accordance with 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 E
39、N 4232. Tightening torque : see product standard. Test criteria The contact bolts shall not loosen and the lead-through shall 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
40、 the tests shall be carried out in each of the switching positions. 5.3.1 Vibration, sinusoidal Mounting method Mounting 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 e
41、lectrical 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
42、 criteria The torque for the connections and attachments shall not be less than 80 YO of the rated value. No opening of closed 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 AECMA PREN*2349 95 10123LL 000
43、9284 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 sample without absorption or resonance. The electrical connections shall be wired
44、 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 connecti
45、ons and attachments shall not be less than 80 % of the rated value. No opening of closed contacts for longer than 10 /IS. No closing of open contacts for longer than 1 ,us. Verification tests : B, C, D, F, G, J and K (see table 6). 5.3.3 Shock Mounting method Mounting of the switching device on the
46、drop slide shall be rigid, so that the shock 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 drop slide as close as possible to the point of electrical connect
47、ion. Test procedure The switching device shall be subjected to a shock 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 % of the rated value. No opening of closed contacts for longer than 1 O ps. No cl
48、osing of open contacts for longer than 1 ps. Verification tests : B, C, D, F, G, J and K (see table 61. AECMA PREN*i 20 A, the maximum permissible contact voltage drop carrying 10 % of the rated load shall be calculated as follows : 0,15+0,05 V=I, x xl O00 I2 Where : V is the voltage drop in millivo
49、lts I is the load current in amperes 1 is the rated current in amperes Page 30 prEN 2349: 1995 The test shall be performed at the inaxitnuin perinissible temperature, as defined in the product standard. During the test the housing of the switching device shall be connected to the earth of the electrical installation by a fuse with a rating of 5 % of the rated resistive contact current, but not greater than 3 A. Blowing of the fuse shall constitute a failure. Nuinber of switching cycles : see product standard. One switching cycle coinprises : - connecti
