Bonding and screening Negative leads connected to a system bonded point must be both as short and possible and “star“-connected to each other, trying then to have their centering tidily and properly made (Figure 1, re. M). Further, following warnings are to be compulsorily observed for electronic components: - Electronic central units must be connected to system bonding when they are provided with a metallic shell. - Electronic central units negative cables must be connected both to a system bonding point such as the dashboard opening bonding (avoiding “serial“ or “chain“ connections), and to battery negative terminal.
- Analog bonding (sensors), although not connected to battery negative system/terminal bonding, must have optimal isolation. Consequently, particularly considered must be parasitic resistances in lugs: oxidising, clinching defects, etc. - Screened circuits braiding must only electrically contact the end towards the central unit entered by the signal (Figure 2). - If junction connectors are present, unscreened section d , near them, must be as short as possible (Figure 2). - Cables must be arranged such as to result to be parallel to reference plane, i.e. as close as possible to chassis/body structure. Figure 1 1. NEGATIVE CABLES “ STAR “ CONNECTION TO SYSTEM BONDING M Figure 2 88039 2.
SCREENING THROUGH METALLIC BRAIDING OF A CABLE TO AN ELECTRONIC COMPONENT — C. CONNECTOR d. DISTANCE ! 0 Base - September 2006 Print 603.93.531 VIII