Victron energy Orion-Tr, Manual

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4.5 Engine detection override
Applying >7V to the L-pin of the remote on/off circuit activates the
“engine detection override” function. The charger is on as long as
the “engine detection override” is active. With this function an
external control (e.g. ignition switch, CAN bus engine on detector)
can determine if charging is allowed.
The remote on/off function also needs to be activated so option a)
or b) in figure 3 must also be connected. See examples in figure 4
below.
4.6 Cable and fuse recommendations
Figure 5: Cable and fuse recommendations
Only an ignition switch BMS
Figure 4: Engine Detection Override connection diagram