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7. Recommendations when Using the
USR3500 on Trucks
Caution:
The power supply connection of the modem must never be directly connected to the truck battery.
7.1.
Recommended Power Supply Connection on
Trucks
All trucks have a circuit breaker on the exterior of the cabin. The circuit breaker is
used for safety reasons: if a fire blazes in the trucks, (for example, on the wiring trunk)
the driver may cut the current source to avoid any damage (explosion). The circuit
breaker is connected to the truck ground, most often associated with the fuse box.
Most truck circuit breakers do not cut the Positive Supply line of the battery, but cut
the ground line of the latter.
Figure 27.
Recommended Power Supply Connection on Trucks
The figure above shows the recommended power supply connection where the
ground connection of the modem is not directly connected to the battery but is
connected after the Circuit Breaker (on the truck ground or the fuse box).
Rev 1.0
1/27/14
48
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