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Descriptions and non-contractual illustrations in this document are given as an indication only.
ERCO&GENER reserves the right to make any modifications.
Dct_427_00
5.2.2 Technical constraints in truck
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 lorry is starting up if the circuit breaker is closed (in this
case, the ground of the lorry and the ground of the battery will be connected via the modem as described in
the scheme below)
GenPro 2xe
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 lorry (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 about 60 A (when starting
the lorry), or they would be destroyed.
