The Loop System's Control Signals - Husqvarna Automower Technical Manual

1. Function
1.7 The loop system's control
signals
The loop system, consisting of the boundary wire
connected to the charging station, basically
comprises four different signals: A-signal, F-signal,
N-signal and S-signal.
See Loop (5-2-4) on page 37 to check the F and
N-signals.
A-signal =
A
The signal that the charging station transmits over the
F
loop and which demarcates the working area for the
Automower. Coded information is transmitted via the
A-signal to the mower. This is unique for each
N
individual installation.
S
When there is no A-signal, for example with a break
in the boundary wire or in the power supply to the
charging station, the Automower stops and displays
3012-326
the fault message No loop signal.
When the LED on the charging station is lit this
indicates it is powered up and the boundary wire is in
full working order. See the table on page 12 for other
indications.
F-signal =
Automower in the test position
Remote signal from the charging station which has a
range of 6 – 7 metres. The signal is generated by the
F
large coil in the charging station plate. The F-signal
guides the mower in the direction of the charging
N
station.
When there is no F-signal, the Automower will not be
able to find the charging station. The mower will
eventually stop and display the fault message Low
battery voltage.
N-signal =
Near signal from the charging station with a range of
approximately 1 metre. The signal is generated by
the two small coils in the charging station plate. The
N-signal guides the Automower directly into the
charging station, so that the charging strips and
contact strips make contact.
The Automower cannot enter the charging station
when there is no N-signal. The mower will eventually
stop and display the fault message Low battery
voltage
3012-644
S-signal =
Signal that the charging station sends out through the
guide loop. The S-signal guides the mower along the
guide wire to or from a remote area.
If there is no S-signal, the Automower can not follow
the guide wire.
Automower from 11
™