MT LB60 - Battery charger DOMETIC - Free user manual and instructions

USER MANUAL MT LB60 DOMETIC

Technical line drawing of two electronic device modules with visible internal components and mounting holes (no text or symbols)

MT LB50, MT LB60, MT LB90

EN Charging booster

Installation and Operating Manual.....15

Ladeboosteren

© 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.

Technical diagram of an electronic device with labeled components and wiring, showing exploded view and detail views.

2 8 594 6312 1110 A: 10000 A: 1000 A: 100 O: 100 A: 100 B: 100 C: 100 D: 100 E: 100 F: 100 G: 100 H: 100 I: 100 J: 100 K: 100 L: 100 M: 100 N: 100 O: 100 P: 100 Q: 100 R: 100 S: 100 T: 100 U: 100 V: 100 W: 100 X: 100 Y: 100 Z: 100

graph TD
    A["Current"] --> B["Batt. I"]
    B --> C["Battery full"]
    C --> D["Main Charging"]
    D --> E["Batt. II"]
    E --> F["Power"]
    G["MTIP Charging Power Centre"] --> H["Display On/Off"]
    style G fill:#f9f,stroke:#333
    style H fill:#ccf,stroke:#333

4 100 mm 100 mm

5 ✓ ✓ ✓ ✓ ✓ ✓ ✓

6 2. 90° 1. 3.

7 i 5 m 1. 2.3 5 m 4. 5. 5 m

17 BORDSTART D+VS-VS+TRCIT VS-VS+ 5A I 2 1 II 5A G D+ 5A A

18 BORDSTART D+VS-VS+TRCIT+VS-VS+ 5A I 1 2 II 4 3 BORD Com.START G D+ 5A B

19 START D+ VS- VS+ TR CI T T VS- VS+ BORD RD com. START bd rd bk ye bu 85 186 og II 2 1 G D+ 5A 5A C

	EN DE FR	IT NL DA SV NO
rd Red Rot	Rouge Rosso	Rood Rød Rød 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

20 START D+ VS- VS+ TR CI T T VS- VS+ BORD COM. START BORD + - + + 4 bu 30 87 87a ye 86 85 bu bk D+ +B2 +B1 2 I II 1 G D+ - - - - 3 D1

	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	Blă	Blă	Blă

21 START D+ VS- VS+ TR CI T T VS- VS+ BORD COM. START BORD + - + - 4 bu 86 30 bk 87a ye D+ +B2 +B1 2 II + - + - 5A I 1 G D+ 3 D2

	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	Blă	Blă	Blă

graph TD
    A["Device 22"] --> B["Switch"]
    B --> C["Device 1"]
    B --> D["Device 2"]
    B --> E["Device 3"]
    C --> F["Load 5A"]
    D --> G["Load 5A +"]
    E --> H["Load 5A +"]
    F --> I["Current 5A"]
    G --> J["Current 5A +"]
    H --> K["Current 5A +"]
    style A fill:#f9f,stroke:#333
    style B fill:#ccf,stroke:#333
    style C fill:#cfc,stroke:#333
    style D fill:#fcc,stroke:#333
    style E fill:#cff,stroke:#333
    style F fill:#ffc,stroke:#333
    style G fill:#ffc,stroke:#333
    style H fill:#ffc,stroke:#333
    style I fill:#fff,stroke:#333
    style J fill:#fff,stroke:#333
    style K fill:#fff,stroke:#333

23

74 270,5 223

EN

Please read these instructions carefully and follow all instructions, guidelines, and warnings included in this product manual in order to ensure that you install, use, and maintain the product properly at all times. These instructions 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 instructions, 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

DANGER!

Safety instruction: Indicates a hazardous situation that, if not avoided, will result in death or serious injury.

WARNING!

Safety instruction: Indicates a hazardous situation that, if not avoided, could result in death or serious injury.

CAUTION!

Safety instruction: Indicates a hazardous 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

Supplementary information for operating the product.

Safety instructions

Also observe the safety instructions and stipulations 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 damaged.
• If this device's power cable is damaged, the power cable must be replaced by the manufacturer, 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 considerable 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 submerge 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.

- 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.

NOTICE! Damage hazard

• Before start-up, check that the voltage specification 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

DANGER! Failure to obey these warnings 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 moderate 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.

NOTICE! 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 protected against splashing water.

Safety when connecting the device electrically

DANGER! Failure to obey these warnings 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 electrician).
- 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-sections.
• Lay the cables so that they cannot be damaged by the doors or the hood.
  Crushed cables can lead to serious injury.

NOTICE! 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.

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 moderate injury.

Explosion hazard

• Do not 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 conduct voltage even if the fuse has blown.
- Do not disconnect any cables when the device is still in use.

NOTICE! 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 connection 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 moderate 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.
• Wear goggles and protective clothing when 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 area and wait until the battery has acclimatised to the ambient temperature. Then start the charging process.
• Do not smoke, use an open flame, or cause sparking near the engine or a battery.

NOTICE! Damage hazard

• Only use rechargeable batteries.
• Prevent any metal parts from falling on the battery. This can cause sparks or short-circuit the battery and other electrical parts.
• Ensure that the polarity is correct when connecting the battery.
• Follow the instructions of the battery manufacturer and those of the manufacturer of the system or vehicle in which the battery is used.
• If you need to remove the battery, first disconnect the ground connection. Disconnect all connections 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 moderate injury.

Risk of injury

- Only use batteries with integrated battery management system and cell balancing.

NOTICE! Damage hazard

• Only install the battery in environments with an ambient temperature of at least 0^ .
• Avoid deep discharge of the batteries.

Scope of delivery

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

Accessories

Available as accessories (not included in the scope of delivery):

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 installation 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)

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 purpose 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 operating or maintenance will result in unsatisfactory performance 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 permission from the manufacturer
• Use for purposes other than those described in this manual

Dometic reserves the right to change product appearance and product specifications.

Technical description

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 driving. The charging power can be limited to 75 A.

The charging booster can be adapted to different battery types via DIP switches (see chapter "Setting the charging program" on page 26).

The temperature sensor monitors the battery temperature during the charging process (see chapter "Temperature sensor" on page 21).

The charging booster is equipped with a removable display panel for remote control.

The charging booster offers the following functions:

• Microprocessor-controlled, temperature-compensated IUOU 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 parallel operation of the charging booster with other charging sources, for example mains supply 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 batteries)
- Battery overcharge protection
- Reverse current protection

• Protection against short circuit
- Reverse polarity protection (only for house battery connection)

Description of the device

Item in fig. 1, Designation page 3
1	D	i	s	p	l	a	y	p
2 Rubber feet
3 Connections and controls
4 Temperature sensor

Connections and controls

Item in fig. 2, Designation Description page 3
1	S e r 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 temperature 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)
8 D I P battery type		Setting of the charging program (see chapter “Setting the charging program” on page 26)

Item in
fig. 2, Designation Description page 3

9	D I P 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

Display panel

No in fig. 3, Designation page 4
1 On/Off button
2	l	n	d	i	c	a	t

Indicator LEDs on display panel

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 protection (>50°C)
	Flashing slowly	Only LiFePO4 batteries: Low temperature protection (<0°C)

LED Status Description

Battery full (green)	On House battery fully charged (100 %); U2 phase
c h e	s
	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: Temperature sensor is not connected
Batt. II (yellow)	On Starting battery charges the house battery
	Flashing Low voltage protection/ over voltage protection of the starting battery
r L	E D s
	Flashing in 2 s interval	Auxiliary charging terminal for the starting battery activated
Power (red)	On Voltage present; booster charging activated
	Flashing slowly	Low voltage protection of the starting battery
	Flashing • Safety shutdown (chapter “Troubleshooting” on page 29)• Internal device failure (overheating)

Battery charging function

The charging characteristics for fully automated continuous operation without monitoring are referred to as IU0U characteristics (see charging curve in fig. 8, page 6).

1: I phase (Constant current phase)

At the beginning of the charging process, the empty battery is constantly charged with the maximum charging current (100%). The charging current decreases when the battery has reached a state of charge of 75% (90% for lithium batteries). Deeply discharged lead batteries are charged with reduced charging current until the battery voltage exceeds 8 V. The duration of the I phase depends on the state of the battery, the load from the consumers and the state of charge. For safety reasons the I phase is terminated after a maximum of 15 h (in case of battery cell defects or similar).

2: U1 phase (Constant voltage phase)

The U1 phase starts when the battery is fully loaded. The charging current is reduced. During the U1 phase, the battery voltage is kept constant at a high level. The duration of the U1 phase depends on the battery type and the depth of discharge.

3: U2 phase (Trickle charging)

The U2 phase serves to maintain the battery capacity (100%). The U2 phase runs at lowered charging voltage and variable current. If DC loads are connected, they are powered by the device. Only if the power required exceeds the capacity of the device, this surplus power is provided by the battery. The battery then is discharged until the device re-enters the I phase and charges the battery. The U2 phase is limited to between 24 and 48 h depending on the battery type.

Temperature sensor

With the temperature sensor connected, the charging booster adjusts the charging voltage (for lead batteries) or the charging current (for LiFePO4 batteries) according to the measured temperature at the house battery.

NOTE

• For lead batteries: Without temperature sensor connected, the charging voltage is referenced to 20/25 °C.
• For LiFePO4 batteries: Without temperature sensor connected, the charging booster does not work.

The charging characteristics are adjusted as follows:

• For lead acid batteries see fig. 9, page 6.
• For lead gel batteries see fig. 10, page 6.
• For AGM 1 batteries (14.4 V) see fig. 11, page 6.
• For AGM 2 batteries (14.7 V) see fig. 12, page 6.
• For LiFePO4 batteries (13.9 V) see fig. 12, page 6.
• For LiFePO4 batteries (14.2 V) see fig. 13, page 7.
• For LiFePO4 batteries (14.4 V) see fig. 14, page 7.
• For LiFePO4 batteries (14.6 V) see fig. 15, page 7.

Legend

--------	Charging curve without temperature sensor connected
—	Charging curve with temperature sensor connected

Mounting the charging booster

Installation location

NOTICE! Damage hazard

Before drilling any holes, ensure that no electrical cables or other parts of the vehicle can be damaged by drilling, sawing and filing.

NOTE

The charging booster can be installed in any mounting position (fig. 5, page 4).

Observe the following instructions when selecting an installation location:

• Ensure that the mounting surface is solid and level.
• Observe the distance specifications (fig. 4, page 4).

Using the display panel

The display panel can be mounted depending on the installation position of the charging booster.

▶To rotate and reinsert the display panel in place proceed as shown (fig. 6, page 5).
▶To use the display panel as a remote control proceed as shown (fig. 7, page 5).

Connecting the charging booster

The electrical power supply must be connected by a qualified electrician who has demonstrated skill and knowledge related to the construction and operation of electrical equipment and installations and has received safety training to identify and avoid the hazards involved.

CAUTION! Fire hazard

• Observe the recommended cable cross-sections, cable lengths and fuses (see chapter "Determine the cable cross-section" on page 23).
• Place the fuses near the batteries to protect the cable from short circuits and possible burning.
• Ensure that the screws on the terminals are tightened firmly (torque: 2 Nm ± 0.1). Tighten the screws on the terminals again after mounting the device and final cable laying.

NOTICE! Damage hazard

Do not reverse the polarity.

NOTE

• In the case of two or more batteries, parallel connection is permissible if the batteries are of the same type, capacity and age. Connect the batteries diagonally.
• For LiFePO4 batteries: To ensure measuring the internal temperature of the battery use the temperature sensor connector to connect the probe of the temperature sensor to the negative terminal of the house battery.

Observe the following instructions when connecting the charging booster:

- Select the appropriate connection variant.

Legend for fig. 17, page 8 to fig. 21, page 12:

House battery

Starting battery

• Always connect the charging booster before connecting the batteries.
- Do not use ferrules. Strip the cable ends as follows:
- Signal cable 6 mm (0.75 - 1.5 mm ^2 )
- Charging cable 12 mm
- Determine the cable cross-section (see chapter "Determine the cable cross-section" on page 23).

- Connect the probe of the temperature sensor to the negative terminal of the house battery (fig. 17 1, page 8 to fig. 21 1, page 12).

- If the starting battery and the house battery are not each grounded on the chassis: Connect the negative terminal of the house battery to the negative terminal of the starting battery or to ground (chassis) (fig. 17 2, page 8 to fig. 21 2, page 12).

- Protect the positive cable of the house battery with a fuse I (see chapter "Determine the cable cross-section" on page 23).

- Protect the positive cable of the starting battery with a fuse II (see chapter "Determine the cable cross-section" on page 23).

- Select the charging program suitable for the type of house battery used (see chapter "Setting the charging program" on page 26).

Determine the cable cross-section

MT LB 50

Cable cross-section	Cable length START+	Forinsulated assembly: Cable length - battery	Cable fuse II	Cable length COM- to house battery	Cable length BORD+	Cable fuse I
6 m m2---0.5-1.5 m 0.5-1.5 m 50 A*
10 mm2	≤5 m	≤5 m	80 A	1.0-2.5 m	1.0-2.5 m	50 A*/60 A
16 mm2	≤8 m	≤8 m	80 A	1.5-4.0 m	1.5-4.0 m	50 A*/60 A
25 mm2	≤11 m	≤11 m	80 A	2.5-6.0 m	2.5-6.0 m	50 A*/60 A

*Setting on "OUT Limit"

MT LB 60

Cable cross-section	Cable length START+	Forinsulated assembly: Cable length - battery	Cable fuse II	Cable length COM-	Cable length BORD+	Cable fuse I
10 mm^2	-	-	-	0.5 – 2.0 m	0.5 – 2.0 m	70 A
16 mm^2	≤ 6 m	≤ 6 m	100 A	1.5 – 3.5 m	1.5 – 3.5 m	70 A
25 mm^2	≤ 9 m	≤ 9 m	100 A	2.0 – 5.0 m	2.0 – 5.0 m	70 A
35 mm^2	≤ 12 m	≤ 12 m	100 A	-	-	-
16 mm2	-	-	-	0.5 – 1.5m	0.5 – 1.5m	100 A
25 mm2	≤ 6 m	≤ 6 m	150 A	1.0 – 3.0 m	1.0 – 3.0 m	100 A
35 mm2	≤ 9 m	≤ 9 m	150 A	1.5 – 4.0 m	1.5 – 4.0 m	100 A

Connection variant A (fig. 17, page 8)

Connection variant for motor homes that are to be equipped with a house battery and charging device (standard connection variant).

▶ To connect the charging booster proceed as shown in fig. 17, page 8.

Connection variant B (MT LB 50 only) (fig. 18, page 9)

Connection variant for motor homes with an existing cutoff relay.

NOTICE! Damage hazard

The existing cabling and the cutoff relay can be overloaded during operation. Limit the maximum current consumption (see chapter "Limiting the current consumption" on page 27) if the existing cabling is not sufficiently dimensioned according to the recommended cable cross-sections, cable lengths and fuses (see chapter "Determine the cable cross-section" on page 23).

▶ Install the charging booster between the existing cutoff relay (3) and the house battery.
▶Disconnect the existing charging cable at a suitable point. Connect the two cable ends on one side of the terminal block each (4).
▶To connect the charging booster proceed as shown in fig. 18, page 9.

Connection variant C (MT LB 50, MT LB 60) (fig. 19, page 10)

Connection variant for motor homes that are to be equipped with a load relay to enable higher consumption currents than the charging booster supports.

• The load relay is controlled via the TR terminal.
• If connected consumers draw a high current from the house battery (e.g. air-conditioning operation while driving) the load relay remains closed to enable higher charging currents. After falling below this current, the charging booster opens the load relay and takes over the charging process.

CAUTION! Fire hazard

• Adapt the cable cross-sections, cable lengths and fuses to the highest consumer (e.g. inverter).
• When connecting the load relay observe the maximum cable length of 0.5 m and a cable-cross section of
• MT LB 50: 10 mm ^2 - MT LB 60: 16 mm ^2

NOTE

Use the load relay (3) with installation cable set (available as accessory).

▶ To connect the charging booster proceed as shown in fig. 19, page 10.

Connection variant D1 (MT LB 50 only) (fig. 20, page 11)

Connection variant for motor homes with existing central electrical system equipped with integrated cutoff relay and integrated charger.

NOTE

• Use the bypass relay (NC, 100 A) with installation cable set (available as accessory).
• For LiFePO4 batteries: Disable the integrated charger if it is not equipped with temperature-controlled charging and the charging characteristic for LiFePO4 batteries.

▶ Install the charging booster in the starter battery cable between central electrical system (3) and the starter battery.
▶ Install the bypass relay (4) in parallel with the charging booster.
▶To connect the charging booster proceed as shown in fig. 20, page 11.

Connection variant D2 (MT LB 60, MT LB 90) (fig. 21, page 12)

Connection variant for motor homes with existing central electrical system equipped with integrated cutoff relay and integrated charger.

NOTICE! Risk of short circuit

The charging power of the charging booster is too strong to insert the charging booster into the existing wiring. Use the bypass relay (NC, 100 A) with installation cable set (available as accessory) to disconnect starting and house battery while the engine is running.

NOTE

• Optionally use the charging cable set (available as accessory).
• For LiFePO4 batteries: Disable the integrated charger if it is not equipped with temperature-controlled charging and the charging characteristic for LiFePO4 batteries.

▶ Install the charging booster in parallel with the existing central electrical system (3) using separate cabling with according cable cross-sections (see chapter "Determine the cable cross-section" on page 23).
▶Install the bypass relay (4) in the starting battery cable between central electrical system (3) and the starting battery.
▶To connect the charging booster proceed as shown in fig. 21, page 12.

Parallel connection of two charging boosters (fig. 22, page 13)

Connection variant, if very high loads occur (e.g. air conditioning operation) or for large battery groups to increase the charging power.

CAUTION! Electrocution hazard

Ensure that the recommended cable cross-sections, cable lengths and fuses are doubled according to the higher charging currents that may occur.

NOTE

Parallel connection is only permissible if the devices are of the same type and capacity.

▶ Slide the DIP switches to the position "D+" and "Low" (see chapter "Setting the operating mode" on page 27).
▶To connect the charging boosters in parallel proceed as shown in fig. 22, page 13.

Operation

NOTE

Use a small screwdriver to carefully move the DIP switches to the required position.

Setting the charging program

NOTICE! Damage hazard

Only use batteries that are suitable for the specified charging voltage.

NOTE

• Select the charging program suitable for the type of house battery used based on the manufacturer's specifications, the information in the table below and the technical data (see chapter "Technical data" on page 32).
• The specified charging times apply to an average ambient temperature of 20 °C.

▶Slide the DIP switches (fig. 2 8, page 3) to the position shown in the table below to set the charging program for the respective type of house battery.

DIP switch position (gray)	Desired charging program
BORDPbLiFePO4Gel13,9 VAcld/AGM114,2 VAGM214,4 V	Lead-acid batteries (14.4 V)(fig. 9, page 6)U 1: 1 4 . 4 V (2 -U 2: 1 3 . 5 V
BORDPbLiFePO4Gel13,9 VAcld/AGM114,2 VAGM214,4 V	Lead gel batteries (14.4 V)(fig. 10, page 6U 1: 1 4 . 4 V (6 -U 2: 1 3 . 8 V
BORDPbLiFePO4Gel13,9 VAcld/AGM114,2 VAGM214,4 V	AGM batteries (14.4 V)(fig. 11, page 6)U1: 14.4 V (1.5-5 h)U 2: 1 3 . 5 V
BORDPbLiFePO4Gel13,9 VAcld/AGM114,2 VAGM214,4 V	AGM batteries (14.7 V)(fig. 13, page 7)U 1: 1 4 . 7 V (1.U 2: 1 3 . 6 V

DIP switch position (gray)	Desired charging program
BORD Pb LiFePO4 GeI 13,9 V Acid/AGM1 14,2 V AGM2 14,4 V	LiFePO4 batteries (13.9 V)(fig. 14, page 7)U1: 13.9 V (0.5–1 h)U 2 : 1 3 . 9 V
BORD Pb LiFePO4 GeI 13,9 V Acid/AGM1 14,2 V AGM2 14,4 V	LiFePO4 batteries (14.2 V)(fig. 15, page 7)U1: 14.2 V (0.5 h)U 2 : 1 3 . 6 V
BORD Pb LiFePO4 GeI 13,9 V Acid/AGM1 14,2 V AGM2 14,4 V	LiFePO4 batteries (14.4 V)(fig. 16, page 7)U1: 14.4 V (0.3–1 h)U 2 : 1 3 . 8 V
BORD Pb LiFePO4 GeI 13,9 V Acid/AGM1 14,2 V AGM2 14,4 V	LiFePO4 batteries (14.6 V)(fig. 6, page 5)U1: 14.6 V (0.3–0.5 h)U 2 : 1 3 . 8 V

Adapting the charging current

▶Slide the DIP switch (fig. 2 9, page 3) to the position shown in the table below to adapt the charging current to the capacity of the house battery.

DIP switch position (gray)	Charging current
h) OUT Limit max	MT LB 50 0 - 50 A
	MT LB 60 0 - 60 A
	MT LB 90 0 - 90 A
2 h) OUT Limit max	MT LB 50 0 - 45 A
	MT LB 60 0 - 50 A
	MT LB 90 0 - 75 A

Activating the auxiliary charging output

The auxiliary charging output can be activated for automatic trickle charging of the starting battery, e.g. in the event of power consumption during long idle periods.

NOTE

Deactivate the auxiliary charging output if an auxiliary charging output is already present within the system (e.g. as part of a central electrical system).

▶Slide the DIP switch (fig. 2 9, page 3) to the position shown in the table below activate or deactivate the auxiliary charging output for the starting battery.

DIP switch position (gray)	Description
A | □□| B	The auxiliary charging output is deactivated.
A | □□| B	The auxiliary charging output is activated. The starting battery is automatically trickle charged with 0 – 3 A/ 5 A if the house battery is fully charged.

Limiting the current consumption

NOTE

Depending on the charging phase (see chapter "Battery charging function" on page 21), the current consumption of the charging booster from the starter circuit or the alternator can be higher than the charging current for the house battery during driving. Reduce the current consumption:

• To relieve a low-power alternator
- To compensate for under-dimensioned wiring on the vehicle side between the starting battery and the central electrical system.

▶Slide the DIP switches (fig. 2 9, page 3) to the position shown in the table below to reduce the current consumption from starter circuit or alternator.

DIP switch position (gray)	Maximum current consumption
	MT LB 50	MT LB 60	MT LB 90
IN Limit<|□|>max	68 A 82 A 125 A
IN Limit<|□|>max	49 A* 67 A 100 A
IN Limit<|□|>max	42 A* 55 A 82 A
IN Limit<|□|>max	33 A* 43 A 64 A

*Applicable when using existing cables and fuses and depending on the performance of the central electrical system used.

Setting the operating mode

Depending on the operating mode set, the charging booster is activated via the D+ signal or the voltage at the starting battery.

▶Slide the DIP switches (fig. 2 9, page 3) to the position shown in the table below to set the operating mode.

NOTE

• If the charging booster is activated via the D+ signal, the starting battery can be discharged when the ignition is switched on and the engine is not running. Use a D+ active simulator if no D+ signal is available.

• To activate a change of the settings, disconnect the device temporarily from the power supply, the starting battery and the house battery.

• The charging booster starts charging the house battery as soon as the value for "Increase of charging power" is reached on the starting battery. The charging booster continuously increases the charging power from 3% of the charging power until the required (maximum) charging power is reached.

• If the voltage falls below the "switch-off threshold" value for 30 sec, the charging booster switches off automatically.

- If the voltage falls below the value for "Reduction of charging power" (e.g. due to high loads), the charging booster reduces the charging power to relieve the starter circuit. The charging power is always at least 3% of the possible charging power.

DIP switch position (gray)	Description
D+LowHigh	Function selection for control via the charging voltage at the starting battery.Increase of charging power at "START+" terminal >13.5 VReduction of charging power at "START+" terminal < 13.2 VSwitch-off threshold: 13.0 V (30 s)Note: Connect the D+ terminal to the "VS+" terminal via a wire jumper.
D+LowHigh	Function selection for control via the charging voltage at the starting battery with lower switching threshold.Increase of charging power at "START+" terminal >13.3 VReduction of charging power at "START+" terminal < 13.0 VSwitch-off threshold: 12.8 V (30 s)Note: Connect the D+ terminal to the "VS+" terminal via a wire jumper.
D+LowHigh	Function selection for control via the D+ signal of the alternator or the ignition lock signal (terminal 15).Increase of charging power at "START+" terminal >12.5 VReduction of charging power at "START+" terminal < 12.2 VSwitch-off threshold: 12.0 V (30 s)

DIP switch position (gray)	Description
	Function selection for control via the D+ signal of the alternator or the ignition lock signal (terminal 15), suitable for vehicles complying with Euro 6, 6+ standards with highly fluctuating alternator and starting battery voltages.Increase of charging power at “START+” terminal >11.7 VReduction of charging power at “START+” terminal <11.4 VSwitch-off threshold: 11.2 V (30 s)

Setting the night mode

In night mode the display panel is darkened. All LEDs on the display panel except the "Current" LED are switched off.

▶To activate or deactivate the night mode press the On/Off button on the display panel once.

√ The "Current" LED lights up dimly red.

Cleaning and maintenance

NOTICE! Damage hazard

• Never clean the device under running water or in dish water.
• Do not use sharp or hard objects, abrasive cleaning agents or bleach during cleaning as these can damage the device.

▶Occasionally clean the device with a soft, damp cloth.
▶ Regularly check live cables or lines for insulation faults, breaks or loose connections.

Troubleshooting

Fault Possible cause Suggested remedy

The charging booster does not work. The red “Power” LED does not light up.	Insulation faults, breaks or loose connections at the live cables.	▶ Check live cables for insulation faults, breaks or loose connections.▶ If you cannot find an error, contact an authorized service agent.
	Short circuit has been generated. The device fuse must be replaced by an authorized service agent after it has been triggered by excess current.
The charging booster does not work. The yellow “Main Charging” LED flashes.	Over voltage protection of the house battery. Battery voltages too high (>15.5 V).	▶ Reduce the connected voltages. The AC/DC charger combination restarts automatically when the voltage drops to the restart value (<13.2 V).
	Connection of defective charging systems.	▶ Check and remove defective charging systems if necessary.
	Only LiFePO4 batteries: Temperature sensor is not connected.	▶ Connect the temperature sensor.
The charging booster does not work. All LEDs are flashing simultaneously.	Charging program is not set correctly for the battery used.	▶ Check the setting of the charging program (see chapter “Setting the charging program” on page 26).
Unusually long charging time. The yellow “Batt. I” LED flashes.	High temperature protection of the house battery: The charging booster switches to reduced charging voltage (12.8 V) and the maximum charging current is halved when the temperature of the battery exceeds the cutoff value (>50 °C).	▶ Check that the air inlets and outlets are not covered or obstructed.▶ Allow the battery to cool down. The charging booster returns automatically to full charging voltage and current when the temperature drops to the restart value (<48 °C).
Unusually long charging time. The yellow “Batt. I” LED flashes slowly.	Only LiFePO4 batteries: Low temperature protection of the house battery. The charging booster switches to reduced charging current when the temperature of the battery drops below the cutoff value (<0 °C).	▶ Move the battery to a warmer location (>0 °C). The charging booster restarts automatically when the temperature exceeds the restart value (>0 °C).
Unusually long charging time. The yellow “Batt. II” LED flashes.	Over voltage protection of the starting battery. Battery voltage too high (>16.5 V).	The charging booster restarts returns automatically to full charging current when the voltage drops to the restart value (<16.5 V).
Unusually long charging time. The yellow “Batt. II” LED flashes. The red “Power” LED flashes slowly.	Low voltage protection of the starting battery. Battery voltage too low (>set value for “increase of charging power”, see chapter “Setting the operating mode” on page 27). The charging booster switches to reduced charging current (<30 %) to protect the battery.	The charging booster restarts returns automatically to full charging current when the voltage rises to the restart value (set value for “reduction of charging power”, see chapter “Setting the operating mode” on page 27).

Fault Possible cause Suggested remedy

The charging booster stops the charging process. The red "Power" LED flashes.	Shutdown by safety timer. The I phase has lasted too long (>15 h).	Reset the device by removing the control signal at D+. Switch off the motor and disconnect the device from the mains.
	Too many DC loads connected.	Reduce the connected DC loads.
	The battery is defective.	Replace the battery.
	Overheating of the charging booster. The charging booster restarts automatically when the temperature drops.
Full charging current is not reached. The red "Power" LED is lit.	The house battery is already charged.	Load with powerful consumers.
	The sense cables are reversed.	Check the connections at START (VS-/VS+) and BORD (VB-/VB+).
	The charging current is not set correctly.	Check the setting of the charging current (see chapter "Adapting the charging current" on page 26).
	The battery is significantly sulfated.	Replace the battery.
Full charging current is not reached. The "Batt. II" LED flashes.	Voltage at START+ < 11 V.	Check voltage at START+. Increase the motor speed so that the booster can regulate.
	The battery terminals are not connected correctly.	Check the connections. Check the cable cross-sections and lengths (see chapter "Determine the cable cross-section" on page 23). Check the stripped cable ends. Check the voltages directly at the terminals.
	Hidden cutoff relay present (e.g. in the central electrical system).	Adapt connection variant for vehicles with an existing cutoff relay.
	DIP switch is set to "OUT Limit".	Check the position of the DIP switch (see chapter "Limiting the current consumption" on page 27).
The charging booster constantly switches between active and idle state.	Starting battery voltage too low.	The charging current is too high for the alternator. Reduce the charging power (see chapter "Limiting the current consumption" on page 27). Check the starting battery and the alternator.
	Weak D+ signal.	Check the D+ signal. Alternatively use the ignition key signal (terminal 15) or install a D+ active simulator.

Fault Possible cause Suggested remedy

The battery is no longer taking a charge or is unable to hold a charge.	The battery is defective.	▶ Replace the battery.
The display panel does not work.	The display panel is connected incorrectly.	▶ Check the connections (see chapter “Using the display panel” on page 22).
The display panel only lights up poorly.	Night mode is activated.	▶ Switch off the night mode (see chapter “Setting the night mode” on page 28).

Warranty

The statutory warranty period applies. If the product is defective, please contact your retailer or the manufacturer's branch in your country (see dometic.com/dealer).

For repair and warranty processing, please include the following documents when you send in the product:

• A copy of the receipt with purchasing date
- A reason for the claim or description of the fault Note that self-repair or nonprofessional repair can have safety consequences and might void the warranty.

Disposal

Recycling packaging material

Place the packaging material in the appropriate recycling waste bins wherever possible.

Recycling products with non-replaceable batteries, rechargeable batteries or light sources

If the product contains any non-replaceable batteries, rechargeable batteries or light sources, you don't have to remove them before disposal.

If you wish to finally dispose of the product, ask your local recycling center or specialist dealer for details about how to do this in accordance with the applicable disposal regulations.
The product can be disposed free of charge.

Technical data

	MT LB 50	MT LB 60	MT LB 90
Charging output house battery
Charge/buffer/load current, regulated	0 A-50 A	0 A-60 A	0 A-90 A
Reduced charge/buffer/load current, DIP switch position "OUT LIMIT	0 A-45 A 0 A	-50 A 0 A-75 A
Input starting battery
Nominal battery voltage	12 V---	12 V---	12 V---
Recommended battery capacity 60 Ah 60 Ah 100 Ah
Input voltage range (EURO 6 +), D+ controlled	10.5-16.5 V	10.5-16.5 V	10.5-16.5 V
Input over-voltage cutoff (EURO 6 +)	>16.5 V	>16.5 V	>16.5 V
Max. power consumption	700 W	905 W	1350 W
Max. current consumption• Current consumption active, DIP switch position "IN LIMIT"• Current consumption limited, 3 positions of the DIP switch "IN LIMIT"	0.1-68 A49 A, 42 A, 33 A	0.1-82 A67 A, 55 A, 43 A	0.1-125 A100 A, 82 A, 64 A
Activation-control "D+" input, for D+/ terminal 15	8-16 V	8-16 V	8-16 V
TR terminal, load relay/max.	12 V/1 A	12 V/1 A	12 V/1 A
Lead batteries
• Nominal battery voltage• Recommended battery capacity• Maximum pre-charge current of a deeply discharged battery (<8 V)• Minimum battery voltage for start of charging• Protection charge voltage at battery over-temperature	12 V---	12 V---	12 V---
	75-300/400 Ah	100-400/520 Ah	150-600/800 Ah
	25 A	30 A	45 A
	0 V	0 V	0 V
	12.8 V	12.8 V	12.8 V
LiFePO4 batteries
• Nominal battery voltage• Recommended battery capacity• Protection charge voltage at battery under-/over-temperature	12-13.3 V---	12-13.3 V---	12-13.3 V---
	90-300/400 Ah	100-400/520 Ah	150-600/800 Ah
	12.8 V	12.8 V	12.8 V
Under-voltage cutoff	<12 V	<12 V	<12 V
General technical data
Reverse current from battery, standby	0.013 A	0.013 A	0.016 A
Voltage ripple	< 30 mVrms	< 30 mVrms	< 30 mVrms
Limitation of charging voltage house battery	15 V	15 V	15 V
External over-voltage cutoff house battery	15.2 V	15.2 V	15.2 V
Protection class/ type I/IP21
Ambient temperature for operation -20 °C to +45 °C
Ambient humidity	≤ 95 %, non-condensing
Dimensions (W x D x H)	270 x 223 x 70 mm (fig. 23, page 14)
Weight 2.5 kg 2.55 kg 2.8 kg
Inspection/certification

DE

Description technique

• Loodzuuraccu's
• Gelaccu's
• Vliesaccu's (AGM-accu's)
• LFP - accu's

DIP-schakelaar-positie (grijs)		Laadstroom
OUT Limit max		MT LB 50 0 – 50 A
		MT LB 60 0 – 60 A
		MT LB 90 0 – 90 A
OUT Limit max		MT LB 50 0 – 45 A
		MT LB 60 0 – 50 A
		MT LB 90 0 – 75 A

De hulplaaduitgang activeren

FORSIGTIG! Brandfare

FORSIGTIG! Brandfare

DIP-bryter- position (grå)	Ladestrøm
OUT Limit max6 t)	MT LB 50 0 – 50 A
	MT LB 60 0 – 60 A
	MT LB 90 0 – 90 A
OUT Limit max	MT LB 50 0 – 45 A
	MT LB 60 0 – 50 A
	MT LB 90 0 – 75 A

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