FRANKIA OPERATING MANUAL56 FRANKIA OPERATING MANUAL 57
Charge booster:
Fully automatic battery charging booster MT LB90. The charging boosters enable optimised charging of the on-board
batteries while driving, by raising the charging voltage of the alternator to the value required for fully charging the bat-
teries. The charging boosters have an “IU1oU2” charging characteristic with dynamic charging time calculation and the-
refore automatically ensure fast and gentle full charging and subsequent 100% charge maintenance of the connected
batteries from any charge state.
Remote control / Display panel:
The display panel can be found in the storage box on the charging booster for functional checks.
The “Display On/Off” button only switches the display off (e.g. night mode)
or on again. The way of working of the charging boosters is not affected
thereby.
Operating indicators:
• “Current” (charging current, red):
◦ Lights up: Mains or booster charging mode, lights up brighter or darker depending on the charging current
emitted.
◦ Off: the charging current is less than approx. 0.2 A.
• “Batt. I” (On-board battery, yellow):
◦ Lights up: The On-board battery is monitored and charged
◦ Flashes: Battery protection: Battery overtemperature > 50°C, switchover to low safety charging voltage
and half max. charging current, automatic return with slight cooling to 48°C, for LiFePo also with battery
under-temperature <-20°C.
◦ Goes out briefly every 2 s: Only for LiFePo: Battery temperature below 0°C, the charging current can
be reduced to protect the battery for all types of charging, longer charging times for discharged batteries
◦ Off: On-board battery is completely disconnected from the charging booster (safety switch).
• “Battery full” (on-board batteries fully charged, green):
◦ Lights up: Battery 100% charged, charge retention U2, finished
◦ Flashes: The main charging process is in the U1 charging phase, the charge status indicator gradually
increases from around 80% (short flashing, 90% LiFePo) to 100% (long flashing).
◦ Off: The main charging process is still in the I-phase.
• “Main charging” (Main charge on-board battery, yellow):
◦ Lights up: The main charging process works in the I phase and then in the U1 charging phase.
◦ Off: Charge retention U2
◦ Flashes: 1. The battery temperature sensor is not connected for LiFePo charging characteristics!
2. External battery overvoltage > 15.5 V delay 20 seconds, automatic reset < 13.2 V (depending on
type), delay 30 seconds.
• “Batt. II” (STARTER battery, yellow):
◦ Flashes: The power control of the charging booster has reduced the output performance by more than
30% (STARTER battery protection against discharge, ability to start) since the voltage of the STARTER
battery has decreased below the set value for “Reduction of charging power” (Table 2). If the voltage
rises above the value “Increase of charging power”, the system automatically adjusts itself again.
• “Power” (green):
◦ Lights up: The charging booster has been activated and is ready for use.
◦ Flashes: 1. Safety timer shutdown, charging I-phase took too long (15 hours), too many consumers,
battery defective (cell closure). Reset only by removing the signal at “D+/Kl.15” (engine, ignition off).
2. Internal device fault (overheating), automatic reset after cooling.
3. Accidental polarity reversal of the On-board battery (+ and - interchanged).
Commissioning and function test:
The function of the charge booster can be checked:
• Start the vehicle.
• Charge booster is activated and starts with 10% of the maximum charging power.
• LEDs “Power”, “Batt. I”, “Main Charging” light up, LED “Current” glows.
• Increase the revolutions of the vehicle so that the voltage on the start battery rises above the set value
for increasing the charging power.
• The charging capacity is regulated and increases to the maximum value or, if the on-board battery is
already full, to the required value of the charging characteristic.
• The “Current” LED lights up brighter or darker depending on the charging current.
A further operation or maintenance of the device is not required.
Climate control inverters:
The MT 1700 Si-N sine wave inverter converts the 12 V DC voltage of the on-board batteries into 230 V / 50 Hz sine
wave AC voltage with a continuous output of up to 1700 W. The inverter has an intelligent power saving control with
automatic shutdown. This ensures that no more electricity is used when idling than is absolutely necessary. To protect
the batteries, an undervoltage protection is integrated, which switches the inverter off when the battery voltage drops.
Thanks to the integrated mains switchover, the inverter switches off when connected to the shore connection and the
external power is switched directly to the available vehicle sockets.
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