Husqvarna Automower 420 Technical Manual page 15

1. FUNCTION
The Automower® always starts a search for the
charging station using the Irregular method, on the
condition that the delay times for the boundary wire
or any of the guide wires are not set to 0 minutes.
Irregular searching means that the Automower® runs
in an irregular pattern until it encounters the F field
near the charging station. The strength of the F sig-
nal, which is required for the mower to react, is set in
the Charging station range setting.
If a guide wire is installed and the delay time for
this wire has elapsed, the Automower® will start to
search for and follow it to the charging station. If the
delay time for the boundary wire also elapses before
the Automower® has found the charging station, the
mower will also start searching for the boundary wire.
If the mower then finds and follows the boundary
wire, it keeps going until it has found the charging
station or crosses the guide wire. If it crosses the
guide wire, the robotic lawnmower will follow it in-
stead to the charging station.
When the mower follows the boundary wire or a
guide wire, it travels a distance into the F field before
the F and N signals direct it correctly into the charg-
ing station.
If the boundary wire is laid around an island, the Au-
tomower® follows the loop 2 times around the island
before it leaves it and travels on to encounter the
boundary wire at another point.
If the Automower® encounters an obstacle while fol-
lowing the boundary wire, it passes it by traveling in
one or more loops around the obstacle.
If the robotic lawnmower encounters an obstacle
when it follows a guide wire, it passes it by running
closer to the guide wire.
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