Husqvarna Automower 420 Technical Manual page 20

The Info - Loop - A signal display mode shows
the loop signal from the boundary wire measured
through the loop sensors in the mower. The value
should lie between approximately 40 and 160 to
ensure good functionality. The closer to the loop the
mower is, the higher the value. When the robotic
lawnmower is directly over the loop, the value is 0
and when the mower is outside f the loop, the value
is negative.
The A signal is shown for all 4 loop sensors:
• Front L: Front left loop sensor
• Front R: Front right loop sensor
• Rear L: Rear left loop sensor
• Rear R: Rear right loop sensor
The Info - Loop - G, F, N display mode shows the
loop signals from the Guide wires and the F and N
fields measured through the loop sensors on the
mower. The signals are shown for all 4 loop sensors:
• Front L: Front left loop sensor
• Front R: Front right loop sensor
• Rear L: Rear left loop sensor
• Rear R: Rear right loop sensor
To ensure good functionality in guide wires, the
value for the Guide signal should be (-) 70 - 120 be-
side each guide wire.
The Info - Loop - Quality display mode shows the
loop system's signal quality measured through the
loop sensors in the mower. The loop signals can
only be interpreted if the value for Quality is 100%.
If the value is 99% or lower, the loop system does
not function correctly and thus none of the values
displayed for the signals are correct.
The Info - Sensors - Status display mode shows:
• Collision, front and Collision, rear: One way
of testing the collision sensor is to hold
the mower chassis by the stop button and
move the body forward and back with the
handle at the rear. The display shows Yes
or No. Continue to press on the body until
you see that the collision sensors work.
• Lift, R and Lift L: To test the lift sensors,
lift up the front part of the body. When
the body is lifted up the lift sensors are
activated and the mower's display shows
Yes. When the mower is in the lowered
position No is displayed.
English - 20
2. SPECIAL MENU FUNCTIONS
A-loop G, F, N
A-signal, front L
A-signal, front R
A signal, rear L
A signal, rear R
A-loop G, F, N
FL FR
G1 280 282
G2 187 185
G3 X X
F 324 322
N 110 108
A-loop G, F, N
Signal quality
In charging station
Status
Collision, front:
Collision, rear:
Lifted, R
Lifted, L
Quality
150
148
140
142
Quality
RL RR
270 273
174 172
X X
274 270
98 97
Quality
100%
NO
Temp
No
No
No
No