Dometic Buttner MT LB50 User manual

MT LB50, MT LB60, MT LB90
Charging booster
Installation and Operating Manual. . . . . . . 15
Ladebooster
Montage- und Bedienungsanleitung . . . . .34
Amplificateur de charge
Instructions de montage
et de service . . . . . . . . . . . . . . . . . . . . . . . . .54
Booster di carica
Istruzioni di montaggio e d’uso . . . . . . . . .75
Laadbooster
Montagehandleiding en
gebruiksaanwijzing . . . . . . . . . . . . . . . . . . .95
Ladebooster
Monterings- og betjeningsvejledning . . . 115
Laddningsförstärkare
Monterings- och bruksanvisning . . . . . . .134
Ladeboosteren
Monterings- og bruksanvisning. . . . . . . . 153
EN
DE
FR
IT
NL
DA
SV
NO
POWER & CONTROL
CHARGER

© 2022 Dometic Group. The visual appearance of the contents of this manual is
protected by copyright and design law. The underlying technical design and the
products contained herein may be protected by design, patent or be patent
pending. The trademarks mentioned in this manual belong to Dometic Sweden AB.
All rights are reserved.

4445103618 3
4
1
2
33
1
59 7 6 112 11 10 843 2
2

4 4445103618
3
2
1
100 mm
100 mm
4
5

4445103618 5
1.
2.
3.
90°
6
2. 3.
5 m
5 m
1.
4.
5.
5 m
7

6 4445103618
0
5
10
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100
12
14
IU1 U2
U
I
<75% <100% 100%
t
%
V
8
12,5
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U1
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9
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U1
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4445103618 7
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8 4445103618
D+
,,
5 A
5 A
5 A
G
,
+-+-
BORD Com. START
D+ VS- VS+ TR CI T T VS- VS+
BORDSTART
A
1
2
g

4445103618 9
D+
,,
5 A
5 A
5 A
G
,
+-+-
D+ VS- VS+ TR CI T T VS- VS+
BORDSTART
BORD Com. START
B
4
1
2
3
h

10 4445103618
EN DE FR IT NL DA SV NO
rd Red Rot Rouge Rosso Rood Rød Röd Rød
bk Black Schwarz Noir Nero Zwart Sort Svart Svart
vt Violet Violett Violeta Violetto Paars Violet Violett Fiolett
ye Yellow Gelb Jaune Giallo Geel Gul Gul Gul
og Orange Orange Orange Arancione Oranje Orange Orange Oransje
bu Blue Blau Bleu Blu Blauw Blå Blå Blå
ye
vt og
D+
,,
,
5 A
5 A
5 A
bu
bk
8685
3837
G
+-+-
BORD Com. START
D+ VS- VS+ TR CI T T VS- VS+
BORDSTART
rd rd
C
1
2
3
i

4445103618 11
EN DE FR IT NL DA SV NO
bk Black Schwarz Noir Nero Zwart Sort Svart Svart
ye Yellow Gelb Jaune Giallo Geel Gul Gul Gul
bu Blue Blau Bleu Blu Blauw Blå Blå Blå
D+
,,
,
5 A
5 A
G
D+
+B1
+B2
30
86
87
87a
85
+-+-
BORD Com. START
D+ VS- VS+ TR CI T T VS- VS+
BORDSTART
ye
bu
bu
bk
1
2
3
4
D1
j

12 4445103618
EN DE FR IT NL DA SV NO
bk Black Schwarz Noir Nero Zwart Sort Svart Svart
ye Yellow Gelb Jaune Giallo Geel Gul Gul Gul
bu Blue Blau Bleu Blu Blauw Blå Blå Blå
D+
,,
,
5 A
5 A
G
D+
+B1
+B2
30
86
87
87a
85
+-+-
BORD Com. START
D+ VS- VS+ TR CI T T VS- VS+
BORDSTART
ye
bu
bu
bk
D2
1
2
3
4
k

4445103618 13
+- +-
StartBord Com.StartBord Com.
VS- VS+ VB- VB+ VS- VS+ VB- VB+
,,
,
5 A
5 A
5 A 5 A
l

14 4445103618
223
270,5 74
m

4445103618 15
EN
Please read these instructions carefully and follow all instructions, guide-
lines, and warnings included in this product manual in order to ensure that
you install, use, and maintain the product properly at all times. These instruc-
tions MUST stay with this product.
By using the product, you hereby confirm that you have read all instructions,
guidelines, and warnings carefully and that you understand and agree to
abide by the terms and conditions as set forth herein. You agree to use this
product only for the intended purpose and application and in accordance
with the instructions, guidelines, and warnings as set forth in this product
manual as well as in accordance with all applicable laws and regulations. A
failure to read and follow the instructions and warnings set forth herein may
result in an injury to yourself and others, damage to your product or damage
to other property in the vicinity. This product manual, including the instruc-
tions, guidelines, and warnings, and related documentation, may be subject
to changes and updates. For up-to-date product information, please visit
documents.dometic.com.
Contents
Explanation of symbols . . . . . . . . . . . . . . . . . . . .15
Safety instructions . . . . . . . . . . . . . . . . . . . . . . . .15
Scope of delivery . . . . . . . . . . . . . . . . . . . . . . . . .18
Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Intended use . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
Technical description . . . . . . . . . . . . . . . . . . . . .19
Mounting the charging booster . . . . . . . . . . . . 22
Connecting the charging booster . . . . . . . . . . 22
Operation. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Cleaning and maintenance . . . . . . . . . . . . . . . . 28
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . 29
Warranty. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Explanation of symbols
D
!
!
A
I
Safety instructions
Also observe the safety instructions and stip-
ulations issued by the vehicle manufacturer
and authorized workshops.
General safety
!WARNING! Failure to obey these
warnings could result in death or
serious injury.
Electrocution hazard
• Installation and removal of the battery charger
may only be carried out by qualified personnel.
• Do not operate the device if it is visibly dam-
aged.
• If this device's power cable is damaged, the
power cable must be replaced by the manufac-
turer, a service agent or a similarly qualified
person in order to prevent safety hazards.
• This device may only be repaired by qualified
personnel. Improper repairs can lead to consid-
erable hazards.
• If you disassemble the device:
– Detach all connections.
– Ensure that no voltage is present on any of the
inputs and outputs.
• Do not use the device in wet conditions or sub-
merge in any liquid. Store in a dry place.
• Only use accessories that are recommended by
the manufacturer.
• Do not modify or adapt any of the components
in any way.
DANGER!
Safety instruction: Indicates a hazard-
ous situation that, if not avoided, will
result in death or serious injury.
WARNING!
Safety instruction: Indicates a hazard-
ous situation that, if not avoided, could
result in death or serious injury.
CAUTION!
Safety instruction: Indicates a hazard-
ous situation that, if not avoided, could
result in minor or moderate injury.
NOTICE!
Indicates a situation that, if not avoided,
can result in property damage.
NOTE
Supplementaryinformationfor operating
the product.

16 4445103618
• Disconnect the device from the power supply:
– Before each cleaning and maintenance
– After every use
– Before changing a fuse
– Before carrying out electrical welding work or
work on the electrical system
Health hazard
• This device can be used by children aged from
8 years and above and persons with reduced
physical, sensory or mental capabilities or lack of
experience and knowledge if they have been
given supervision or instruction concerning use
of the device in a safe way and understand the
hazards involved.
•Electrical devices are not toys.
Always keep and use the device out of the reach
of very young children.
• Children must be supervised to ensure that they
do not play with the device.
• Cleaning and user maintenance shall not be
made by children without supervision.
ANOTICE! Damage hazard
• Before start-up, check that the voltage specifica-
tion on the data plate is the same as that of the
power supply.
• Ensure that other objects cannot cause a short
circuit at the contacts of the device.
• Ensure that the negative and positive poles
never come into contact.
Installing the device safely
DDANGER! Failure to obey these warn-
ings will result in death or serious
injury.
Explosion hazard
• Never mount the device in areas where there is a
risk of gas or dust explosion.
!CAUTION! Failure to obey these cau-
tions could result in minor or moder-
ate injury.
Risk of injury
• Ensure that the device is standing firmly.
The device must be set up and fastened in such
a way that it cannot tip over or fall down.
• When positioning the device, ensure that all
cables are suitably secured to avoid any form of
trip hazard.
ANOTICE! Damage hazard
• Do not place the battery charger near heat
sources (heaters, direct sunlight, gas ovens,
etc.).
• Set up the device in a dry location where it is pro-
tected against splashing water.
Safety when connecting the device
electrically
DDANGER! Failure to obey these warn-
ings will result in death or serious
injury.
Electrocution hazard
•For installation on boats:
If electrical devices are incorrectly installed on
boats, corrosion damage might occur. Have the
device installed by a specialist (marine electri-
cian).
• If you are working on electrical systems, ensure
that there is somebody close at hand who can
help you in emergencies.
!WARNING! Failure to obey these
warnings could result in death or
serious injury.
Electrocution hazard
• Observe the recommended cable cross-sec-
tions.
• Lay the cables so that they cannot be damaged
by the doors or the hood.
Crushed cables can lead to serious injury.
ANOTICE! Damage hazard
• Use ductwork or cable ducts if it is necessary to
lay cables through metal panels or other panels
with sharp edges.
• Do not lay the 230 V mains cable and the 12 V
DC cable in the same duct.
• Do not lay the cable so that it is loose or heavily
kinked.
• Fasten the cables securely.
• Do not pull on the cables.

4445103618 17
Operating the device safely
!WARNING! Failure to obey these
warnings could result in death or
serious injury.
Explosion hazard
• Only use the device in closed, well-ventilated
rooms.
!CAUTION! Failure to obey these cau-
tions could result in minor or moder-
ate injury.
Explosion hazard
•Donot operate the device under the following
conditions:
– In salty, wet or damp environments
– In the vicinity of corrosive fumes
– In the vicinity of combustible materials
– In areas where there is a danger of explosions
Electrocution hazard
• Always disconnect the power supply when
working on the device.
• Observe that parts of the device may still con-
duct voltage even if the fuse has blown.
• Do notdisconnect any cableswhen the deviceis
still in use.
ANOTICE! Damage hazard
• Ensure that the air inlets and outlets of the device
are not covered.
• Ensure a good ventilation.
• Never pull the plug out of the socket by the con-
nection cable.
• The device shall not to be exposed to rain.
Safety precautions when handling
batteries
!WARNING! Failure to obey these
warnings could result in death or
serious injury.
Risk of injury
• Batteries contain aggressive and caustic acids.
Avoid battery fluid coming into contact with
your body. If your skin does come into contact
with battery fluid, wash that part of your body
thoroughly with water.
If you sustain any injuries from acids, contact a
doctor immediately.
!CAUTION! Failure to obey these cau-
tions could result in minor or moder-
ate injury.
Risk of injury
• When working on batteries, do not wear any
metal objects such as watches or rings.
Lead acid batteries can cause short circuits
which can cause serious injuries.
• Weargoggles andprotectiveclothingwhen you
work on batteries. Do not touch your eyes when
you are working on batteries.
Explosion hazard
• Never attempt to charge a frozen or defective
battery.
Place the battery in a frost-free areaand wait until
the battery has acclimatised to the ambient tem-
perature. Then start the charging process.
• Do not smoke, use an open flame, or cause
sparking near the engine or a battery.
ANOTICE! Damage hazard
• Only use rechargeable batteries.
• Prevent any metal parts from falling on the bat-
tery. This can cause sparks or short-circuit the
battery and other electrical parts.
• Ensure that the polarity is correct when connect-
ing the battery.
• Follow the instructions of the battery manufac-
turerandthose ofthe manufacturerof thesystem
or vehicle in which the battery is used.
• If you need to remove the battery, first discon-
nect the ground connection. Disconnect all con-
nections and all consumers from the battery
before removing it.
• Only store fully charged batteries.Recharge
stored batteries regularly.
• Immediately recharge deeply discharged lead
batteries to avoid sulfation.
• Check the acid level for open lead-acid batteries
regularly.
Safety precautions when handling
lithium batteries
!CAUTION! Failure to obey these cau-
tions could result in minor or moder-
ate injury.
Risk of injury
• Only use batteries with integrated battery man-
agement system and cell balancing.

18 4445103618
ANOTICE! Damage hazard
• Only install the battery in environments with an
ambient temperature of at least 0 °C.
• Avoid deep discharge of the batteries.
Scope of delivery
Accessories
Available as accessories (not included in the scope
of delivery):
Intended use
The battery charger (also referred to as charging
booster) is intended to monitor and charge 12 V
house batteries in motor homes from the alternator
while driving.
The charging booster is intended to be used to
charge the following battery types:
• Lead acid batteries
• Lead gel batteries
• Absorbed glass mat (AGM) batteries
• LiFePO4 batteries
The charging booster is not intended to be used
to charge other types of batteries (e.g. NiCd,
NiMH, etc.).
The charging booster is suitable for:
• Installation in motor homes
• Stationary or mobile use
• Indoor use
The charging booster is not suitable for:
• Mains operation
• Outdoor use
This product is only suitable for the intended pur-
pose and application in accordance with these
instructions.
This manual provides information that is necessary
for proper installation and/or operation of the
product. Poor installation and/or improper operat-
ing or maintenance will result in unsatisfactory per-
formance and a possible failure.
The manufacturer accepts no liability for any injury
or damage to the product resulting from:
• Incorrect assembly or connection, including
excess voltage
• Incorrect maintenance or use of spare parts
other than original spare parts provided by the
manufacturer
• Alterations to the product without express per-
mission from the manufacturer
• Use for purposes other than those described in
this manual
Dometic reserves the right to change product
appearance and product specifications.
Quantity Description
1 MT LB 50, MT LB 60 or MT LB 90
1 Temperature sensor with cable (3 m)
1 Installation and Operating manual
Designation Ref. no.
Load relay (12 V, 100 A/ 180 A) with
installation cable set (for installation
variant C)
9620000184
(MT02156)
Installation cable set and terminal
block with sense cables and fuses
9620000188
(MT 93045)
Bypass relay (NC, 100 A) with instal-
lation cable set (installation variants
D1 and D2)
9620001495
(MT 93050)
Extension cable (5 m) with adapter
for display panel used for remote
control
9620000171
(MT 02005)
Charging cable set (2 m) with fuse
(250 A)
9620001496
(MT 22002)
Charging cable set (3 m) with fuse
(250 A)
9620001497
(MT 22003)
Charging cable set (4 m) with fuse
(250 A)
9620001498
(MT 22004)
Charging cable set (5 m) with fuse
(250 A)
9620001499
(MT 22005)
Charging cable set (6 m) with fuse
(250 A)
9620001500
(MT 22006)

4445103618 19
Tech nic al desc rip tio n
General description
MT LB 50: The device charges with 50 A while
driving. The charging power can be limited to
45 A.
MT LB 60: The device charges with 60 A while
driving. The charging power can be limited to
50 A.
MT LB 90:The device charges with 90 A while driv-
ing. The charging power can be limited to 75 A.
The charging booster can be adapted to different
batterytypes viaDIP switches(seechapter “Setting
the charging program” on page 26).
The temperature sensor monitors the battery tem-
perature during the charging process (see chapter
“Temperature sensor” on page 21).
The charging booster is equipped with a remov-
able display panel for remote control.
The charging booster offers the following func-
tions:
• Microprocessor-controlled, temperature-com-
pensated IU0U charging programs for various
battery types
• Auxiliary charging output for the starting battery
• Buffer operation: Compliance with the charging
characteristics even when the battery is charged
with consumers connected
• On-board mains suppression filter: Ensures par-
allel operation of the charging booster with
other charging sources, for example mains sup-
ply chargers, solar systems or generators
• Automatic compensation of voltage loss caused
by the charging cable length (house battery)
The charging booster has the following protective
mechanisms:
• High voltage protection
• Low voltage protection
• High temperature protection
• Low temperature protection (only LiFePO4 bat-
teries)
• Battery overcharge protection
• Reverse current protection
• Protection against short circuit
• Reverse polarity protection (only for house bat-
tery connection)
Description of the device
Connections and controls
Item in
fig. 1,
page 3
Designation
1Displaypanel
2 Rubber feet
3 Connections and controls
4 Temperature sensor
Item in
fig. 2,
page 3
Designation Description
1Service
connection
For authorized personal
only
2 VB–/VB+
terminal (OUT)
Inputs for sense cables to
measure and control the
charging voltage at the
house battery
3 T T terminal 2 connections for tem-
perature sensor
4 CI terminal (without function)
5 TR terminal Output for controlling a
bypass relay
6 VS–/VS+
terminal (IN)
Inputs for sense cables to
measure and control the
charging voltage at the
starting battery
7 D+ terminal Input for D+ signal of the
alternator or ignition lock
signal (terminal 15)
8DIPswitches
battery type
Setting of the charging
program (see chapter
“Setting the charging pro-
gram” on page 26)

20 4445103618
Display panel
Indicator LEDs on display panel
9DIPswitches
battery
capacity and
functional
settings
Setting of the charging
current (see chapter
“Adapting the charging
current” on page 26) and
other functions
10 START+ Connection to positive
pole of 12 V starting
battery
11 COM– Connection to negative
pole of the house bat-
tery/chassis
12 BORD+ Connection to positive
pole of 12 V house battery
No in
fig. 3,
page 4
Designation
1 On/Off button
2IndicatorLEDs
LED Status Description
Current
(red)
On Charging current present;
brightness indicates the
intensity of the charging
current
Batt. I
(yellow)
On House battery is charged
Flashing High temperature protec-
tion (> 50 °C)
Flashing
slowly
Only LiFePO4 batteries:
Low temperature protec-
tion (< 0 °C)
Item in
fig. 2,
page 3
Designation Description Battery full
(green)
On House battery fully charged
(100 %); U2 phase
Flashing Charging process in
U1 phase (lead batteries:
> 75 %, LiFePO4 batteries:
>90%)
Flashing
slowly
State of charge 75 – 100 %
(lead batteries: < 75 %,
LiFePO4 batteries: < 90 %)
Main
Charging
(yellow)
On Charging process in
I/U1 phase
Flashing • Over voltage protection
of the house battery
(> 15.5 V)
• Only LiFePO4 batteries:
Temperaturesensorisnot
connected
Batt. II
(yellow)
On Starting battery charges the
house battery
Flashing Low voltage protection/
over voltage protection of
the starting battery
Flashing in
2sinterval
Auxiliary charging terminal
for the starting battery acti-
vated
Power
(red)
On Voltage present; booster
charging activated
Flashing
slowly
Low voltage protection of
the starting battery
Flashing • Safetyshutdown(chapter
“Troubleshooting” on
page 29)
• Internal device failure
(overheating)
LED Status Description