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tec.News 17: Automation IT Michael Seele Shock-Resistant HARTING MicroTCA connectors are extremely robust and therefore suitable for use in rugged environmental conditions. In these applications, connectors have to guarantee secure connections despite being subjected to shocks, impacts and vibrations. HARTING uses con:card+ and Plug connectors also for applications beyond telecommunications. Originally deployed for the telecommunications industry, MicroTCA uses a robust mechanism that is suitable for simple industrial applications. Conventional MicroTCA systems are, however, limited to low shock and low vibration applications. In various tests, HARTING has now shown that solutions such as con:card+ can also be utilized in areas with strong vibrations (for example, in transport systems or aviation). These tests were based on PICMG specifications. The “RuggedMicroTCA” workgroup is currently developing various specifications that expand the existing MTCA.0 30 harting tec.News 17 (2009)
ase specification. Additional requirements and tests for the use of MicroTCA in rugged environmental conditions are to be established. The requirements that connectors have to meet are already largely defined. Different requirements The requirement profiles are currently divided into three specifications, which target industrial and outdoor applications (MTCA.1), applications from the transportation market (MTCA.2) and aviation and defense applications (MTCA.3). The shock and vibration-resistance requirements are graduated within the three profiles, depending on the expected application areas. connector such as MicroTCA and HARTING is the first company to meet this challenge. To ensure that the HARTING MicroTCA connector can withstand these stresses, HARTING has carried out several tests and simulated the described conditions in an accredited laboratory. The aim was to prove that HARTING The specifications are named after the cooling concept that, under MTCA.1, is known as “rugged air cooled”. This refers to an air-cooling that is to meet additional requirements regarding vibration and shock testing and is planned, in particular, for industrial applications. As extended temperature ranges are also defined, MicroTCA is also interesting for outdoor applications (e.g. base stations for telecommunications). MTCA.2 systems have to meet the “hardened air cooled specification” and are therefore to be designed for more extreme shock and vibration conditions. Air-cooling is also planned for these systems, however, with tougher requirements in terms of shock and vibration. The MTCA.3 specification describes a cooling without moving parts (“hardened conduction cooled specification”). The modules are fixed in the system by means of wedge locks so that the heat can be discharged via cold plates. Advanced stress tests In all three applications, the system is often exposed to enormous stresses. It is therefore absolutely essential that the connector withstand this stress without any contact interruption. This poses a great challenge for a card edge Fig. 1: The 3 AdvancedMC cards were tested with the „double full size“ form factor with a weight of 700 grams each solutions already meet future requirements for MTCA.1 to MTCA.3. The test system was equipped with mechanical components according to the MTCA.0 specification. Conventional AdvancedMC modules according to PICMG AMC.0 were used as test cards. Rugged air cooled specification (MTCA.1) For MTCA.1, a sinusoidal vibration with an alternating frequency of 2 Hz to 200 Hz is planned. This frequency range will pass through ten times in three axes; the test setup will simulate three times the gravitational acceleration (30 m/s²). No contact interruptions should occur during the tests. The HARTING con:card+ connector passed this test successfully. 3 31
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Page 23 and 24: Rainer Bussmann All-Weather Connect
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Page 75 and 76: tec.News 17: Kaleidoscope Hemendra
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Page 79 and 80: HARTING Trade Show Calendar Apr 20

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