Dometic Buttner MT BCB 30/30/20 IU0U Instructions De Montage Et De Service page 20

LED indicator on display panel
LED Status
Current On
(red)
Off
Batt. I On
(yellow)
Flashing
slowly
Flashing
quickly
Off
Battery full On
(green)
Flashing
Flashing
slowly
Main On
Charging
(yellow)
Flashing
20
Description
Charging current present;
mains or booster charging
mode
Charging current < 0.2 A
House battery is charged in
mains or booster charging
mode
• High temperature pro-
tection
• Only LiFePO4 batteries:
Low temperature pro-
tection
Only LiFePO4 batteries:
Temperature < 0 °C,
reduced charging current
causing longer charging
times
No charging
House battery fully
charged (100 %);
U2/U3 phase
Charging process in
U1 phase (lead batteries:
< 75 %, LiFePO4 batteries:
< 90 %)
State of charge 75 – 100 %
(lead batteries: > 75 %,
LiFePO4 batteries: > 90 %)
Charging process in
I/U1 phase
• Over voltage protection
• Temperature sensor is
not connected (only
LiFePO4 batteries)
4445103619
LED Status
Batt. II On
(yellow)
Off
Flashing
Power On
(green)
Flashing
slowly
Flashing in
2 s interval
Flashing in
20 s interval
Battery charging function
A main charging cycle of the house battery is initi-
ated in the following situations:
• After a standstill of the alternator or mains failure
• After falling below the reset voltage of 12.75 V
for lead batteries or 13.10 V for LiFePO4 batter-
ies for 30 s
I
NOTE
In all charging phases (U1 phase to
U3 phase), almost the entire possible
charger current is available for the addi-
tional supply of DC loads without dis-
charging the battery.
The charging characteristics for fully automated
continuous operation without monitoring are
referred to as modified IU0U characteristics (see
charging curve in fig. 6, page 5).
1: Analysis phase
The battery is deeply discharged (> 10 %). The
battery charge is analyzed with increasing
charging current.
Description
Booster charging mode;
starting battery charges the
house battery
Booster charging not acti-
vated
Starting battery voltage too
low
Voltage present; mains or
booster charging mode
• Safety shutdown (chap-
ter "Troubleshooting"
on page 31)
• Over temperature pro-
tection
• AC power limit function
activated
• Night mode activated
Pulsing operation mode