26/08/2021 v.1.10
ArSilicii s.r.l.
9
4-Wire connection
The 4-wire connection, instead, separates the loads from the leisure battery. In this way is possible
to keep distinguish between the current delivered to/from external loads and sources from that
delivered to charge the leisure battery and optimize charging cycle. With the 4-wires connection
the unit can estimate precisely the charging status of the aux battery and deliver the proper voltage
and current in accordance to the charging algorith for the battery type selected.
Control Signal Lines
Regarding control signals from the vehicle, the connection strictly necessary is the activation signal
(either positive or negative), that is pin 2 (for switched to 12V) or 5 (for switched to gnd signals) on
connector D.
In most cases, you want to short-circuit pin 3 with pin 6 in order to disable Adaptive Charging (Low
power mode).
Unfortunately, every car manufacturer makes available slightly different signals and furthermore
uses a different naming convention.
On most of the vehicles signals are available notifying when the ignition key is turned and when the
engine is effectively running. Sometimes only one of the two signals is available.
Below some commented examples of how engine signals cabling.
Adaptive Charging
If pin 3 on connector D is not connected to reference ground (negative), then adaptive charging is
enabled. This mode
limits the output current
. This mode is to be used when input cabling size is
small, in order to avoid a too big voltage drop on the device input line.
