Husqvarna Automower 305, Техническое руководство

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English - 14
1.15 Battery
The robotic lawnmower is equipped with a Li-Ion
battery. Compared with a NiMH, for example, Li-
Ion has very good properties, even at high ambient
temperatures. The battery also has low self-discharge,
i.e. it can remain unused for a longer period than, for
example, 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 transformer.
Normal charge current is 1.5 A for Automower
®
308
and Gardena R70Li and 1 A for Automower
®
305
and Gardena R40Li. When the voltage in the battery
approaches the nominal voltage of 21 V the physical
properties in the battery cause the charge current
to decrease. When the charge current has dropped
to 0.3 A, the mower is considered fully charged and
charging stops.
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 capacity utilised is thus 1.2 Ah and not
1.6 Ah which is the battery’s total capacity.
How to measure the condition of the battery is
described in “6.6 Battery test” on page 87 .
1.16 Sensors
There are several different types of sensor in the
mower. A collision sensor (1), tilt sensor (2) and lift
sensor (3) have the task of protecting both mower
and user. Rear (4) and front (5) loop sensors are
used to control the mower within the working area, to
position the mower when docking, tracking the guide
wire, etc.
1.16.1 Collision sensor
The collision sensor is the sensor that detects when
the mower has run into a fixed object. When the
sensor is activated, i.e. the mower collides with an
object, the mower waits, reverses and then turns to
continue in a different direction. The body’s motion
in relation to the mower’s chassis is detected by a
sensor on the main circuit board via a magnet on the
body.
1.16.2 Tilt sensor
The tilt sensor is the sensor that detects the mower’s
inclination in relation to the horizontal plane.
X-angle indicates front to rear inclination, and the
Y-angle indicates left to right inclination. The value
from the tilt sensor is used, among other things, to
compensate the operation of the wheel motors when
mowing on slopes.
1.16.3 Lift sensor
The lift sensor is the sensor that senses whether
the mower is being raised off the ground. This is
done with the help of the mechanical design and a
magnet in the body at the front of the mower. If the
“lift” sensor is triggered, the mower and the blade
disc stop immediately. The mower will then try to
free itself of the obstacle that caused it to lift off the
ground by backing up and turning several times.
1. FUNCTION
21 V
0.3 A
1.0 A
Charge current Voltage
1.2 Ah Capacity
Model 305 308 R40Li R70Li
Charge Current 1.0 A 1.5 A 1.0 A 1.5 A
Battery Capacity 1.6 Ah 1.6 Ah 1.6 Ah 1.6 Ah
Used Capacity
1.2 Ah 1.2 Ah 1.2 Ah 1.2 Ah
Charge Time,
min
80-100 60-80 80-100 60-80
Cutting Time,
min
50-70 50-70 50-70 50-70
3020-005
3020-006
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3 4
5