WM_PRJ_M13_UGD_001 - 001
20th July 2004
© 2004
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Wavecom Confidential & Proprietary Information
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Figure 11 gives an example of electrical connection which may dramatically
damage the Modem when its ground connection is directly connected to the
battery ground.
In this example, when the circuit breaker is switched off, the current flows
through the MODEM and powers the electrical circuit of the truck (dashboard for
example).
Furthermore, when the Starter Engine command will be used, it will destroy the
cables or the Modem.
Since the internal tracks are not designed to support high current (up to 60 A
when starting the truck), they will be destroyed.
5.2.2 Recommended Power Supply connection on trucks
M1306B
Figure 12: Recommended power supply connection on trucks
Figure 12 gives 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 fusebox).
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