Guide Loop; Charging Station; Circuit Boards And Sensors - Husqvarna Automower 435X AWD Workshop Manual

3.5 Guide loop

The guide wire, together with the part of the boundary
loop that comprises the return to the charging station, is
called the guide loop. The current in the guide loop
always goes from the guide wire to the left in the
connection between guide wire and boundary loop.
The strength of the guide signal varies like the A signal
depending on the distance to the guide loop. Inside the
guide loop the signal is positive and the strength
subsequently diminishes the farther away from the wire
you get. Outside the guide loop, the signal is negative
and the strength of the signal diminishes more rapidly.
Note: The product always tracks the left side of the
guide wire when facing the charging station, i.e. the
product follows the negative values on the guide signal.
CAUTION: Do not lay the guide wire at 90°
angles or less. Lay the wire in two 135° angles.
135º

3.6 Charging station

The placement of the charging station must be well
planned in order to give the best installation and
operation of the product. Refer to
station in the Operator's Manual.
Note: The battery is spared if charged in the lowest
possible ambient temperature. Consequently, it is
beneficial if the charging station is placed where it is
shaded, especially during the warmest parts of the day.
When the battery voltage has dropped to 17.25 V, the
product shuts down the blade motor and starts
searching for the charging station.
1061 - 001 -
90º
135º
Installation - Charging

3.7 Circuit boards and sensors

There are several types of circuit boards and sensors in
the product:
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3
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1
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1. Front loop circuit board (Front loop sensors)
2. 3D circuit board (Front lift/collision sensors)
3. Ultrasonic sensors
4. Application circuit board (Start/stop sensor and
switch cord sensor)
5. Front motor control circuit board (Tilt sensor and
cutting height sensor)
6. Ultrasonic circuit board
7. 3D circuit board (Rear lift/collision sensors)
8. 3D circuit board (Angle sensor)
9. Rear loop circuit board (Rear loop sensors)
10. Rear Motor Control circuit board (Tilt sensor)
CAUTION: Some sensors consist of a Hall
sensor and a magnet. Since the magnets have
a south and a north pole, it is important that the
magnet is fitted correctly.
3.7.1 Tilt sensor
The tilt sensor is a sensor on the motor control circuit
board that detects the product's inclination in relation to
the horizontal plane. The 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 correct the speed of the drive wheels
when mowing in steep slopes.
3.7.2 3D sensors
The 3D sensors are used for different functions in the
product. They have the same circuit board with different
configuration. The signal is generated with help of the
mechanical design and magnets.
• Lift sensors - The lift sensors detect if the product is
being lifted off the ground. If a lift signal is indicated,
the product and the blade disc will stop. The product
tries extrication maneuvers by reversing and turning
several times.
• Collision sensors - The collision sensors detect
when the product runs into an object. If the collision
sensor is indicated, the product stops and moves
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Product and installation - 7