Husqvarna AUTOMOWER 420 User manual

HUSQVARNA AUTOMOWER® 420/430X/450X
TECHNICAL MANUAL

English - 3
1 Function 5
1.1 Husqvarna Automower®420, 430X and 450X, what's what? 5
1.2 Introduction 6
1.3 Technical data 7
1.4 Software 8
1.5 Cutting technique 9
1.6 The loop system’s control signals 11
1.7 Loop system status 12
1.8 Boundary wire 12
1.9 Guide wire 14
1.10 Searching methods to nd the charging station 14
1.11 Automatic detection of passages 16
1.12 Docking and charging 16
1.13 Battery 16
1.14 Sensors 17
2 Special menu functions 18
2.1 Quick Info 18
2.2 Discover the PIN code 25
2.3 Tools menu 25
2.4 Main menu, an overview 26
2.5 Tool menu, an overview 27
2.6 Tool menu, functions 28
3 Installation 35
3.1 Charging station 35
3.2 Boundary wire 36
3.3 Guide wire 38
3.4 Testing the installation 39
3.5 Calibrate guide 40
3.6 One robotic lawnmower for several working areas 41
3.7 Even mowing results in complex working areas 41
3.8 Weather timer 42
3.9 Safe operation on slopes 43
3.10 New loop signal 43
4 Autocheck Experience, service program 44
4.1 Installation and login 45
4.2 Connection to the robotic lawnmower 46
4.3 Use 47
5 Repair instructions 54
5.1 Design and function 55
5.2 Dismantling and assembling the robotic lawnmower 59
5.3 Dismantling the charging station 63
5.4 Assembling the charging station 63
5.5 Changing the top cover (450X) 64
5.6 Replacing the charging strips 64
5.7 Replacing the battery 65
5.8 Replacing the MCB 65
5.9 Replacing the HMI board 66
5.10 Replacing the GPS board/Automower Connect board 67
5.11 Replacing the keypad 68
5.12 Changing the ultrasound sensors (450X) 69
5.13 Replacing the ultrasound board (450X) 69
5.14 Replacing the headlight (450X) 69
5.15 Replacing the buzzer 70
5.16 Replacing the main switch 70
5.17 Cleaning or replacing the ventilation lter 71
5.18 Replacing the sensors 72
5.19 Replacing the blade motor 74
5.20 Replacing the wheel motor 75
5.21 Replacing the cutting height adjustment motor 75
5.22 Replacing the rear collision columns 76
5.23 Replacing front collision column/lift sensor 76
5.24 Changing and regreasing lower front wheel bearing 78
5.25 Replacing the circuit board, charging station 78
5.26 Replacing the contact strips, charging station 79
5.27 Assembling the sealing strip 79
5.28 Mounting screws 80
5.29 Mounting thread plugs 81
5.30 Screw fasteners 82
6 Troubleshooting 83
6.1 Messages 84
6.2 Symptom 91
6.3 Loop signal 95
6.4 Troubleshooting the loop signal 95
6.5 Finding a break in the boundary wire 97
6.6 Battery test 98
7 Maintenance and service 100
7.1 Cleaning 100
7.2 Winter storage 100
7.3 Service schedule 101
TABLE OF CONTENTS

WARNING
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The Technical Manual for the Husqvarna Automower® 420, 430X and 450X is a supplement to the Operator's
Manual. The manual contains in-depth information about the robotic lawnmower and its peripheral equipment.
The Technical Manual is intended for dealers, service personnel, etc.
Under no circumstances may the original design of the robotic lawnmower be modied
without the expressed permission of the manufacturer.
Unauthorized modications and/or components can result in serious disruptions and the
risk of personal injuries.
Only use original spare parts.
Husqvarna AB has a policy of continuous product development and therefore reserves the right to modify the
design, appearance and function of products without prior notice.
More support for dealers can be found at:
support.husqvarna.co.uk
Technical Manual Husqvarna Auto Mower® 420, 430X and 450X Edition m/2016.
INTRODUCTION

Automower 420 Automower 430X Automower 450X
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English - 5
1 Function
1.1 Husqvarna Automower®420, 430X and 450X, what's what?
The numbers in the picture correspond to:
1. Body
2. Cover for display and keypad.
3. Stop button/Locking button to open the cover
4. Fixture for accessories, e.g. headlights
(only Automower 430X)
5. Front wheels
6. Rear wheels
7. Ultrasonic sensors (only Automower® 450X)
8. Headlights
9. Exchangeable cover (only Automower® 450X)
10. LED for checking the function of the charging station,
boundary wire and guide wire
11. Contact strip
12. Parking button (not Automower®420)
13. Charging station
14. Rating plate
15. Display
16. Keypad
17. Cutting system
18. Chassis box with electronics, battery and motors
19. Handle
20. Main switch
21. Blade disc
22. Skid plate
23. Power supply
24. Extra blades
25. Alarm decal
26. Low voltage cable
27. Operator's manual and QuickGuide
28. Screws for securing the charging station
29. Cable markers
30. Measurement gage for help when installing the boundary wire
(the measurement gage is broken loose from the box)
31. Couplers for the search wire *
32. Loop wire for boundary wire and guide wire *
33. Pegs *
34. Connectors for the search wire *
* Included with Installation Kit, not included in the purchase of the
robotic lawnmower
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1.2 Introduction
This Technical Manual contains important information
about the Husqvarna Automower®420 430X and 450X
and their function, how to install them and a number
of installation examples. It also contains information
about special menu functions available for the mower,
the Autocheck Experience service program, repair
instructions and troubleshooting.
To make it easier to follow, the following structure is used:
• Text written in italics is shown in the mower's
display or in the menus in the Autocheck
Experience service program.
• Words that are written in bold represent the
keys on the mower’s keypad or a button in the
Autocheck Experience service program.
• Words written in UPPERCASE italics refer to
the position of the main switch and the different
operating modes available in the robotic
lawnmower.
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1.3 Technical data
Data Automower® 420 Automower® 430X Automower® 450X
Dimensions
Length 72 cm 72 cm 72 cm
Width 56 cm 56 cm 56 cm
Height 31 cm 31 cm 31 cm
Weight 11.5 kg 13.2 kg 13.9 kg
Electrical system
Battery Special Li-ion battery
18 V/3.2 Ah,
Part no. 580 68 33-01
Special Li-ion battery
18 V/5.2 Ah,
Part no. 588 14 64-01
Special Li-ion battery
18 V/10.4 Ah,
Part no. 588 14 64-01 (2 pack)
Power supply 100–240 V/28 V DC 100–240 V/28 V DC 100–240 V/28 V DC
Length of low voltage cable 10 m 10 m 10 m
Mean energy consumption at maximum
use
17 kWh/month in a 2,200 m2
working area
18 kWh/month in a 3,200 m2
working area
23 kWh/month in a 5,000 m2
working area
Charge Current 2.2 A DC 4.2 A DC 7 A DC
Average charging time 55 minutes 65 minutes 75 minutes
Average mowing time 105 minutes 135 minutes 260 minutes
Noise emissions *)
Measured noise power level **) 56 dB (A) 56 dB (A) 58 dB (A)
Guaranteed noise power level 58 dB (A) 58 dB (A) 59 dB (A)
Noise pressure level ***) 45 dB (A) 45 dB (A) 47 dB (A)
Cutting
Cutting system Three pivoted, cutting knife
blades
Three pivoted, cutting knife
blades
Three pivoted, cutting knife
blades
Blade motor speed 2,300 rpm 2,300 rpm 2,300 rpm
Power consumption during mowing 30 W +/- 20% 30 W +/- 20% 35 W +/- 20%
Cutting height 2-6 cm 2-6 cm 2–6 cm
Cutting width 85" / 24 cm 85" / 24 cm 85" / 24 cm
Narrowest possible passage 85" / 60 cm 85" / 60 cm 85" / 60 cm
Maximum incline of mowing area 45% 45% 45%
Maximum incline of boundary wire 15% 15% 15%
Maximum length of boundary wire 800 m 800 m 800 m
Maximum length of guide wire 400 m 400 m 400 m
Working capacity 2,200 m2+/- 20% 3,200 m2+/- 20% 5,000 m2+/- 20%
IP classication
Robotic lawnmowers IPX4 IPX4 IPX4
Charging station IPX1 IPX1 IPX1
Power supply IPX4 IPX4 IPX4
**) uncertainties KWA 2 dB (A) 2 dB (A) 1 dB (A)
**) uncertainties KPA 2-4 dB (A) 2-4 dB (A) 2-4 dB (A)
*) Noise emissions in the environment measured as noise power (LWA) according to EC directive 2000/14/EC. The guaranteed noise power includes variation in
production and variation from the test code with 1-3 dB(A).
Noise emission declarations agree with EN 50636-2-107:2015
Husqvarna AB does not guarantee full compatibility between the robotic lawnmower and other types of wireless systems such as remote controls, radio transmitters,
hearing loops, underground electric animal fencing or similar.
1. FUNCTION

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1.4 Software
The behavior of the robotic lawnmower is controlled
by microprocessors and software. There is an MSW
program (Main SoftWare), an HMI program (Human
Machine Interface) and an SSW program (Subsystem
SoftWare).
The main program (Main) interprets the signals from
the sensors and controls the operation accordingly.
The HMI program checks the presentation of informa-
tion in the display and the input of, for example, key-
strokes on the keypad. The HMI program contains the
texts that are shown in the display.
The SSW program controls the blade motor, among
other functions.
This Technical Manual for the Automower® 420, 430X
and 450X covers versions 6.00.00 of the main program
and 6.00.00 of the HMI program.
1.4.1 Ascertaining the program version
1. Set the main switch to position 1.
2. When the start page is displayed: Keep the 0
key pressed in for 2 seconds to go to Quick
Check.
3. Select Info and press OK.
4. Select General and press OK.
5. The main program version is indicated on the
line that starts MAIN:e.g. 7.02.00. The HMI
program version is indicated on the line starting
HMI: e.g. 6.00.00. The SSW program version is
indicated on the line starting SUB: e.g. 6.00.00.
6. Hold down the BACK button for 2 seconds to
exit Quick Check and return to the main menu.
It is important that the robotic lawnmower is
programmed with the latest software versions.
Husqvarna is continuously improving the
mower’s behavior and performance, which
results in new software versions.
Software type 450X
MAIN 7.02.00
HMI 6.00.00
SUB 6.00.00
COM 6.00.00
U.SONIC 1.00.00
SW Prod.
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1.5 Cutting technique
The mowing system is based on an efcient and en-
ergy saving principle. Unlike many conventional mow-
ers, the robotic lawnmower cuts the grass instead of
knocking it off.
1.5.1 Mowing in different weather
conditions
Rain
We recommend you allow the robotic lawnmower to
mainly mow in dry weather to obtain the best possible
result. The robotic lawnmower can also mow in the
rain, however, wet grass easily sticks on the robotic
lawnmower and there is a greater risk of it slipping on
steep slopes.
Thunder
If there is a risk of thunder, all connections to the
charging station must be disconnected. This is done
to avoid damage to the circuit board in the charging
station.
1.5.2 Blades
It is more important to have good condition and sharp
blades on a robotic lawnmower than on a conven-
tional mower. It is the principle of the cutting the grass
instead of knocking it off that makes this difference.
The double edged blades together with the technol-
ogy that rotates the blade disc in both directions in-
crease the life of the blades.
In order to keep the blades sharp for as long as pos-
sible it is important to keep the lawn free from branch-
es, small stones and other objects.
Worn blades should not be ground. This is to prevent
the mowing system from becoming imbalanced.
Poor or dull blades can result in the grass bending
instead of being mown, the tops become frayed and
the mower may nd it difcult to mow a large working
area.
All blades and screws must be replaced at the same
time to ensure the cutting system is balanced.
There are many different types of blades and they
are sold in various package sizes. Use only approved
original blades from Husqvarna. From the start of
2011 these are marked with a Husqvarna symbol.
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1.5.3 Irregular mowing pattern
The robotic lawnmower mows the lawn in an irregular
pattern. This gives a very even mowing result. In ad-
dition, there are no distinctive tracks left in the lawn,
which is often the case when using a conventional lawn
mower.
Spiral cutting
Sometimes the robotic lawnmower can change the
mowing pattern and start to mow in a spiral pattern in-
stead. This is called spiral cutting. The purpose of spiral
cutting is to quickly get the same length of grass over
the entire working area.
When the robotic lawnmower starts spiral cutting this
means it has perceived the lawn in an area to be longer
and/or thicker than before. The length/thickness of the
lawn in this area does not need to differ that much from
the other areas for the robotic lawnmower to start spiral
cutting. Sometimes the difference is hardly visible.
The robotic lawnmower always attempts to keep the
blade disc at an even speed. Different degrees of pow-
er are used for this depending on the length/thickness
of the grass. Automower® compares the instantane-
ous power with an average power value from the latest
hours of mowing. This means that, when the robotic
lawnmower enters an area where the lawn is longer/
thicker than before, the instantaneous power will differ
from the average power and the Automower® will then
start spiral cutting.
The factory setting for Intensity is Medium for the
Automower® to begin spiral cutting. Intensity can be
set between Low/Mid/High using the Settings - Spiral
cutting menu. It is also possible to entirely shut down
the spiral cutting function in this menu. The Low setting
means that the robotic lawnmower begins spiral cutting
less often.
Spiral cutting is only activated in the automatic operat-
ing position, i.e. the Main area mode. Mowing in the
Secondary area mode does not allow the robotic lawn-
mower to begin spiral cutting.
1. FUNCTION