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6.4 Sites Containing Narrow
Straits
These sites require specific installation of the periph-
eral wire.
The required minimum width of the strait, depends on
the length of the strait. If this minimum width is not
available when the robot is in Zone B, it will not be able
to pass through the strait and return to the charging
station. In this case, installation of an additional
charging station in Zone B is required.
The table below presents the minimum distance
between wires required to enable the robot to follow
its trackborder from Zone B through the strait and
return to the charging station in Zone A.
6.5 Sites With Long Lanes
A long lane represents an area where a minimum
distance for the installation of the peripheral wire is
required. If this minimum distance is not met, the robot
may not be able to detect the peripheral wire. If the
peripheral wire is not detected, the robot cannot
return to the charging station to charge its battery.
If the length of the lane is less than 49.2 ft. (15 m), then
the minimum distance between the peripheral wire
must be greater than 32.8 ft. (10 m).
6.6 Obstacles
Obstacles are objects that the robot must avoid. Exam-
ples are:
•
trees, flower beds
•
swing sets, climbing frames, trampolines
•
sidewalks, walking paths, terraces
•
ponds, swimming pools
Some obstacles are detected by the sonar sensors on
the robot. Other obstacles require the installation of
the peripheral wire to create an island, or a
pseudo-island.
If an island is created, the robot will not approach the
obstacle. The robot will move across the peripheral
wire to avoid the obstacle.
If a pseudo-island is created, the robot will approach
the obstacle, and then maneuver around it.
Obstacles Near the Boundary to be Mowed
1 – Narrow strait
2 – Peripheral wire
3 – Minimum distance between peripheral wire
4 – Length of strait
2
Zone A
Zone B
3
1
4
1 – Lane
2 – Peripheral wire
3 – Minimum distance between peripheral wire
2
1
3
DRAFT
05-23-2019
