20 AUTOMATIC CHARGER
7. DETAILED DESCRIPTION OF
THE CHARGING PROCEDURE
The „Mains“ (Netz) LED lights up after connecting to the electrical mains
(230V/50Hz). The device goes into the check mode after setting of the bat-
tery type by means of the slide switch and connecting a 2 V, 6 V or 12 V lead
battery (Acid, gel, AGM, EXIDE gel battery). The „Error“
(Fehler) LED as well
as the „Charging“
(Laden) LED flashes, if the voltage of a correctly connected
battery is higher than 14.3 V (for a 12 V battery) or more than 7.15 V in the
case of a 6 V battery or more than 2.4 V in the case of 2 V battery. The device
switches to the charging mode, if the voltage is in the range of 0.5…2.4 V (2 V
battery), 0.5…7.15 V (6 V battery) or 0.5…14.3 V (12 V battery).
Charging technology
The device has three different charging phases:
< I-Phase, the charging current is approx. 0.6 A for a 12 V battery and
approx. 0.3 A for a 2 V and 6 V battery.
< U1-Phase (= Main charging phase) with a constant voltage of 14.3 V
(and/or 2.4 V or 7.15 V)
< U2-Phase (Trickle charge) with constant voltage of 13.8 V
(and/or 2.3 V or 6.9 V).
The battery is first charged with a constant current (I-phase) until the final charge
voltage (14.3 V/7.15/2.4 V) has been reached. The voltage is then kept
constant (U1-Phase) and the charging current adapts itself to the charge state of
the battery. The fuller the battery, the lower the charging current. The charging
procedure is terminated and the battery charger switches automatically into the
test mode, if a charging current of approx. 100 mA is under run (see note N3).
The battery is loaded with a defined current during this test. A large internal
resistance and/or a strong sulphation of the battery is indicated, if the voltage
of the loaded battery thereby drops back to the rated voltage.
The battery charger evaluates the battery as „defective“, if the test is not passed;
the device then switches itself off and the „Error“
(Fehler) and „Finished“ (Fertig)
LED‘s flash.
The battery charger switches the „Finished“
(Fertig) LED on and goes into
the refresh mode, if all test criteria have been fulfilled after charging and the
