BÜTTNER ELEKTRONIK – Batt erie-Control-Booster MT BCB 30/30, MT BCB 40/40, MT BCB 60/40
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4.9. Operati ng mode displaying and troubleshooti ng
Current (red):
• illum:
Brightness lighter or darker depending on the
charging current provided
• off:
Actual charging current is less than approx. 0.2 A
Batt. I (Board batt., yellow): • illum:
Board battery is monitored and being charged
• flashing:
1. Battery protection: excessive battery temperature
> 50°C, switching to lower safety charge voltage,
automatically return when cooling down slightly
to 48°C, with LiFePO
4
batteries also at low battery
temperatures < –20 °C
2. Control input “BMS” was activated from the
LiFePO
4
Battery, i.e. charging stopped
• short extinct LiFePO
4
only: Battery-temperature < 0 °C, to pro-
(every 2s) tect the battery, the charging current can be
reduced for all types of charging, which means longer
charging times for discharged batteries.
• off:
No charging (safety switch is switched off).
Battery full (Board batt., green):
• illum:
State of charge 100 %, Maintenance charge U
2
, U
3
(CV), ready.
• flashing: Main charging process still in phase U
1
(CV),
state of charge approx. 75 % (Pb)/90 % (LiFePO
4
)
(short flashing) gradually increases to 100 % (long
flashing)
• off:
Main charging process still in phase I (CC).
Main Charging (Board batt., yellow):
• illum:
Main charging process in phase I (CC) or U
1
(CV).
• flashing:
1. Temperature-sensor not detected for LiFePO
4
battery charge program
2. External over-voltage at board battery, > 15.50 V
after 20 s, automatic return < 13.2 V (depend.
type) after 30 s.
• off:
Maintenance charge in phase U
2
, U
3
(CV).
Batt. II (Start-batt., yellow): • illum:
Booster operation (charge while driving), start batt.
charging board batt.
• flashing:
Operating voltage at terminal “START” is too low,
the power control of the booster therefore has re-
duced the output power by more than 30 %.
• off:
Booster not activ.
