AEG Micro-Processor Charging Unit LP 3.8 - Manual (Page 19)

19 GB
Step 2: Main charging
Charging to 80 % of power:
1. the charger provides the battery with a constant
charging capacity of max. 3.8 a until the terminal
voltage reaches a value of 12.8 V.
2. the charger provides the battery with a constant
charging capacity of max. 3.0 a until the terminal
voltage reaches a value of 14.1 V. By reducing the
maximum available charging capacity, the heating
of the battery is minimised. this leads to a reduction
of gas build-up within the battery.
Step 3: Absorption
the charger provides the battery with a constant
charging capacity of max. 0.8 a until the terminal
voltage has reached a value of 14.4 V. the battery is
fully charged. subsequently, the charger automatically
switches to the buffer charging phase.
Step 4: Buffer charging
Buffer charging starts after the battery is completely
charged (LED FULL (13) lights up).
in this mode the connected battery is constantly
charged with approx. 100 ma power. as soon as
the terminal voltage of the battery monitored by the
charger falls below 12.8 V, maintenance charging is
automatically activated.
Step 5: Maintenance charging
in this mode the connected battery is constantly
charged with approx. 800 ma power until the terminal
voltage reaches 14.4 V. after reaching this terminal
voltage the charger will automatically switch back to
buffer charging.
this procedure continues cyclically for as long as
possible, depending on the monitored terminal voltage
and is not terminated until the charger is disconnected.
Due to this change of the charge cycle the battery is
kept at the highest possible charging level.
Recovering a used battery
▪
the charger can save most used batteries with volt-
ages up to at least 7.5 ± 0.5 V
▪
Before starting the charging procedure the charger
automatically identifies the battery voltage
▪
thanks to the safety circuit the charger does not
start charging if the voltage is below 7.5 ± 0.5 V
▪
in the voltage area of 7.5 ± 0.5 V to 10.5 ± 0.5 V
the charger initiates an impulse charging procedure
▪
if the voltage increases to more than
10.5 ± 0.5 V, the charger switches to the previously
selected normal mode for faster and safer charging.
CHargiNg pHasEs
the charger performs a fully automated 5-level charge
cycle.
Charging
with a
high rate
Charging
with an
intermediate
rate
absorption
0.8 a
Buffer
charging
100 ma
maintenance
charging
0.8 a
below 12.8 V
14.4 V 14.4 V
14.1 V
12.8 V
10,5 V
3.8 a
3.0 a
impulse
main charging
Voltage V
15.5
13.5
11.5
9.5
7.5
0
Diagnosis
and
corrective
actions
Step 1: Diagnosis and corrective actions
Diagnosis function during which the battery status is
automatically checked and the voltage identified.