24 4445103618
MT LB 90
Connection variant A (fig. g, 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. g, page 8.
Connection variant B (MT LB 50 only)
(fig. h, page 9)
Connection variant for motor homes with an exist-
ing cutoff relay.
A
➤Install the charging booster between the exist-
ing cutoff relay (3) and the house battery.
➤Disconnect the existing charging cable at a suit-
able 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. h, page 9.
Connection variant C (MT LB 50,
MT LB 60) (fig. i, page 10)
Connection variant for motor homes that are to be
equipped with a load relay to enable higher con-
sumption 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.
!
I
➤To connect the charging booster proceed as
shown in fig. i, page 10.
Cable cross-
section
Cable length
START+
For insulated
assembly:
Cable length
- battery
Cable fuse ΙΙ
Cable length
COM–
Cable length
BORD+
Cable fuse Ι
16 mm² – – – 0.5 – 1.5m 0.5 – 1.5m 100 A
25 mm² ≤ 6m ≤ 6m 150A 1.0–3.0m 1.0–3.0m 100A
35 mm² ≤ 9m ≤ 9m 150A 1.5–4.0m 1.5–4.0m 100A
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 con-
sumption” 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).
CAUTION! Fire hazard
• Adapt the cable cross-sections, cable
lengths and fuses to the highest con-
sumer (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 mm²
– MT LB 60: 16 mm²
NOTE
Use the load relay (3) with installation
cable set (available as accessory).
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