Automower from 13
1. Function
™
The strength of the A-signal also varies along the
boundary wire depending on the proximity to other
parts of the loop. The strength of the signal is
affected by the size of the working area, islands,
heads, passages and corners.
In small installations or sub-areas, narrow passages
and out-turned corners the strength of the signal is
higher. In large installations, heads that point in
towards the area and in-turned corners the strength
of the signal is lower.
When the signal is amplified or weakened, it is
normal that low respective high signal strengths are
not always available along the entire length of the
boundary wire.
This means that the Automower will not follow the
boundary wire at the same distance everywhere along
the loop, even if the set corridor width is the same. The
mower will, for example, take a short cut in corners
and not always be able to negotiate passages.
Should the Automower not find the right loop signal
strength when searching for the charging station, it will
look for the strength by running in a saw tooth pattern
along the boundary wire and in this way search the
area closest to the loop. The behaviour is recognised
through the Automower running for a short distance,
stopping, searching, running for a short distance again,
stopping, searching, running for a short distance again,
stopping, searching and so on.
If the Automower does not find the right loop signal
strength when it leaves the charging station to follow
the loop to a remote area, it will start to mow directly
instead.
1.8.2 Guide loop
The guide wire together with the part of the boundary
wire that makes up the return to the charging station
is known as the guide loop. The current in the guide
loop always goes to the left in the connection
between the guide wire and the boundary wire. The
signal from the guide loop is called the S-signal.
The strength of the S-signal varies like the A-signal
depending on the distance to the guide loop. Inside
the guide loop the signal is positive and its strength
diminishes the further from the cable you come.
Outside the guide loop the signal is negative and its
strength diminishes more rapidly. The area inside the
guide loop is called the guide area. Automower
always runs on the left side of the guide wire in the
direction towards the charging station, i.e., the mower
follows the negative value on the S-signal.
3012-605
Propagation of the loop signal strength, seen from ground
level
Outside Inside
Wire
320
275
70
35m
Strength of the
A-signal
3012-606
Saw tooth pattern
3012-704
Guide area
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