DAILY MCA2014 4x4 ‒ BODYBUILDER INSTRUCTIONS
ELECTRONIC SUB-SYSTEMS
5.4 ELECTRICAL SYSTEM: CURRENT INTERVENTIONS AND DRAWS
27
– Printed 603.95.994 – 1 Ed. - Base 05/2015
● electronic control units must be connected to the system ground when equipped with metal housings
● the negative cables of the electronic control units are to be connected to a system ground point, connected to the negative
terminal of the battery;
● the analogue grounds (sensors), while not being connected to the system ground/negative terminal of the battery, are to have
good conductivity. Consequently, particular care should be given to terminal parasitic resistances: oxidation, scratches, etc
● the metal braid of the shielded circuits must be in electrical contact only at the control unit side to which the signal is to be
sent
● In the presence of junction connectors the unshielded section d, near them, should be as short as possible;
● 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.
191317
Figure 25
"STELLA” connections of various negatives with the system ground
191318
Figure 26
Shielding by means of a metal braid of a cable leading to an electronic component
Electromagnetic comparability
It is recommended that electrical, electro-mechanical and electronic devices which comply with the following immunity require-
ments for electromagnetic emissions, both irradiated and conducted, are used, as shown below:
The level of electromagnetic immunity of the electronic devices equipping the vehicle at a distance of one metre from the transmit-
ting aerial must be:
● 50 V/m immunity for devices performing secondary functions (not impacting on direct vehicle control), for frequencies vary-
ing from 20 MHz to 2 GHz
● 100 V/m immunity for devices primary secondary functions (not impacting on direct vehicle control), for frequencies varying
from 20 MHz to 2 GHz;.
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