Automatic Detection Of Passages; Docking And Charging; Battery - Husqvarna Automower 420 Technical Manual

1.11 Automatic detection of
passages
When the robotic lawnmower follows a guide wire it
does so at a maximum distance defined by the cor-
ridor width setting (Installation - Advanced - Corridor
width). The distance is randomly varied from one
search to another to reduce the risk of tracks forming.
If the robotic lawnmower is about to enter a pas-
sage where the loop signal from the boundary wire is
stronger, the robotic lawnmower will run closer to the
guide wire to make its way through the passage. The
auto passage handling can be canceled in the Instal-
lation - Advanced - Auto passage handling menu. If
this function is disabled, the robotic lawnmower will
not be able to regulate the distance it follows the
guide wire, and the corridor width must as result be
modified to cope with all passages in the installation.

1.12 Docking and charging

The mower entering the charging station is called
docking.
When the charging strips on the robotic lawnmower
make contact with the contact strips on the charging
station, the mower stops and charging begins.

1.13 Battery

The robotic lawnmower is equipped with a Li-Ion bat-
tery. Compared with a NiMH, for example, Li-Ion has
very good properties, even at high ambient tempera-
tures. The battery also has low self-discharge, i.e. it
can remain unused for a longer period than, for exam-
ple, NiMH without being damaged. Counted in number
of charging cycles, the service life is also expected to
be longer for Li-Ion than NiMH.
Charging is primarily controlled by the power supply.
Normal charging current is 2.2A for the 420, 4.2A for
the 430X and 7A for the 450X.
The battery is considered fully charged when the
battery reaches 80% of its total capacity. To charge
the battery to 100% would take too long because the
charge current is so low. The most rational way of
using Li-Ion is therefore to stop charging at 80%. The
maximum utilized capacity is thus 80% of the bat-
tery's total capacity.
Chapter 6.6 Battery test on page 98 describes
how to measure the condition of the battery.
English - 16
1. FUNCTION
Model
Charge Current
Battery Capacity
Used Capacity
Charge Time, min 50-70
Cutting Time, min 80-110
Automower
®
420 430X 450X
2.2 A 4.2 A 7 A
3.2 Ah 5.2 Ah 10.4 Ah
2.6 Ah 4.2 Ah 8.3 Ah
50-70 60-80
110-150 230-270