May, 2017
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Page 69
The Impact of LV 214-4: German Automotive OEM Connector Test Spec
By Rob Boyd, Senior Production Manager, Schleuniger
facturers can measure different areas of quality, while also providing the end user with the assurance that they are purchasing a trustworthy, long-lasting product. Within the wire processing industry there are many standards that manufacturers may choose or that they are required to adhere to. These standards and spec- ifications are constantly evolving and increasing in detail, especially as monitoring technology improves. LV 214-4 is an automotive stan-
S
dard that has been developed by rep- resentatives of German car manufac-
The (LV 214-4 ) standard outlines terminal require ments
specifically for the automo- tive industry. The standard addresses the ability of ter- minals to be effectively
evaluated by crimp force monitors.
turers, including Audi, BMW, Daim - ler, Porsche, and Volkswagen. The standard outlines terminal require - ments specifically for the automotive industry. The standard addresses the ability of terminals to be effectively evaluated by crimp force monitors. To be used in an automotive wire har- ness, terminals must exhibit certain crimp force characteristics so that typical crimp force monitors can effec- tively detect critical error modes. Though it is currently in draft form and many points are still largely the- oretical, the standard has been mak- ing progress for many years.
Concepts Old and New The standard focuses on relative
deviation of force curves and head- room, both common concepts with regard to crimp force monitoring. Relative deviation is the variation of peak force expressed as a percentage. Headroom is the difference between the peak forces of the average good crimp and empty crimp curves, also expressed as a percentage. LV 214-4 defines what an
empty crimp is — something that is not clear to all. In a good crimp the conductor crimp is filled with all con- ductor strands and the insulation crimp with all undamaged insulation material. Crimp parameters are at the nominal values as specified by the manufacturer. An empty crimp has a full insulation crimp, but the conductor crimp is empty. For many years, crimp force
monitors have analyzed the total area under the crimp curve. However, LV 214-4 defines four area segments: one for good crimps and one for each error mode, specifically, empty crimp, missing strands and insulation-in-the-crimp. The good crimp area is the area between the good crimp curve and the empty crimp curve. Similarly, the missing strand area is the area between the missing strand curve and the empty
See at NEPCON China, Booth 1H39 and at SMT Hybrid Packaging, Booth 4-101
tandards and specifications from various organizations pro- vide guidelines by which manu-
crimp curve. Alternatively, the area for insulation-in-the-crimp is the area between the insulation-in-the- crimp and the good crimp curves. Differences in each of these areas must be detectable for the correspon- ding error mode. The LV looks closely at the “roll-
in” portion of the crimp. The roll-in area is the beginning of a crimp force curve where the terminal wings
Empty crimp (left) and full crimp (right). Continued on next page
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