Grounding And Screening - Iveco NEF Series Repair Manual

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8
PREMISE

Grounding and screening

The negative conductors connected to circuit ground point must be as short as possible and connected in "star" form, ensuring
that their tightening is done neatly and sufficiently (Figure 1 ref. M).
The following precautions must be observed regarding the electronic components:
— electronic control units must be connected to the system ground when equipped with metal housings.
— The negative cables of the electronic control units must be connected at a circuit ground point, such as dashboard compartment
ground (avoiding "serial" or "chain" connections), as well as to the negative terminal of the battery or batteries.
— Even if not connected to the circuit ground/battery negative terminal, analogue ground (sensors) should have optimal insulation.
Consequently, particular care should be given to terminal parasitic resistances: oxidation, clinching defects, etc.
— The metal braid of shielded circuits must be in contact only at the ECU side to which the signal is to be sent (Figure 2).
— In the case of junction connectors, the unshielded section d near to them must be as short as possible (Figure 2).
— The cables must be routed in such a way as to be parallel to the reference plane, as close as possible to the chassis/body.
Figure 1
1. "STAR" CONNECTIONS OF NEGATIVE CABLES TO THE CIRCUIT GROUND M
Figure 2
2. SHIELDING BY METAL BRAID OF A CABLE TO AN ELECTRONIC COMPONENT - C. CONNECTOR
d. DISTANCE ! 0
Base - March 2014
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NEF G-Drive Stage IIIA SERIES
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