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Descriptions and non-contractual illustrations in this document are given as an indication only.
ERCOGENER reserves the right to make any modifications.
Dct_427_02
5.2.2 Technical constraints in trucks
It is highly recommended
NOT
to connect the modem supply directly to the battery but to the circuit breaker.
Otherwise the modem can be damaged when the truck is starting up if the circuit breaker is closed (in this
case, the ground of the truck and the ground of the battery will be connected via the modem as described in
the scheme below).
Example of
forbidden
electrical connection (risk of damage on the modem)
The scheme above shows an example of electrical connection that could damage the modem due to the fact
that the ground connection is directly connected to the battery ground.
In fact in this example, when the circuit breaker is open, the current escapes via the modem and the
electrical circuits of the truck (the dashboard for example).
And when the motor’s starter is used, it will
destroy the cables or the modem.
Moreover, the internal circuits of the modem are not designed to resist to a current of about 60 A (when
starting the truck), or they would be destroyed.