Battery Charging; Charging With "Standard" Charging Characteristic - Bosch BAT 490 Manual Original

4.4

Battery charging

4.4.1 Charging with "Standard" charging
characteristic
I
U
t2
t1
Fig. 4: "Standard" charging characteristic
I = 20 % of set battery capacity
1
I = 2 % of set battery capacity
2
U = 14.0 V – 14.4 V (12 V)
1
28.0 V – 28.8 V (24 V)
U = 14.4 V – 14.8 V (12 V)
2
28.8 V – 29.6 V (24 V)
U = 12.8 V / 25.6 V
3
Phase 1 (t1): Main charging, green LED flashes
rapidly
The charging current I is approx. 20
1
ry capacity. Once the battery has attained the charging
cut-off voltage U , the charging current I
1
crease. Approx. 65 % of the battery capacity has then
been attained. The battery is ready for use as a starter
battery. Phase 1 is over when the charging current I
drops below approx. 2 % of the battery capacity. The
battery is then approx. 97
Phase 2 (t2): Secondary charging, green LED flashes
slowly
The charging current I is approx. 2
2
capacity. Phase 2 is time-controlled with a duration cor-
responding to 65 % of the phase 1 time. The charging
voltage is restricted to U .
2
Phase � (t�): �rickle charging, green LED lights
The charging current is always activated when the
battery voltage drops below U
remains active until the charging voltage U
again.
Example:
For a set battery capacity of 80 Ah, the charging current I
is approx. 16 A and the charging current I
Robert Bosch GmbH
t3
% of the set batte-
starts to de-
1
% charged.
% of the set battery
. The charging current
3
is attained
1
approx. 1.6 A.
2
i
The battery need not be disconnected from the ve-
hicle electrical system during charging.
i
The BAT 490 automatically detects whether a 12 V or
a 24 V battery is connected.
If the voltage of the 24 V battery is less than 17 V,
I
each of the two series-connected 12 V batteries
1
must be charged separately.
Below 17 V, the BAT 490 only detects a 12 V battery
U
2
and charging would therefore also only be performed
U
1 for a 12 V battery.
U
3
1. Connect the red charging clip to the positive post (+)
of the battery.
I
2. Connect the black charging clip to the negative
2
post (‒) of the battery.
3. Switch on the BAT 490 by way of the on/off switch
t
(Fig. 2, Pos. 1).
 The red LED (Fig. 1, Pos. 3) lights.
4. Press .
 The battery voltage is displayed for three seconds
and the "Modes" menu then appears.
i
The BAT 490 modes are only displayed if a battery is
connected.
Mode
Standard charging
Expert charging
Buffer mode
Backup mode
1
5. Select "Standard charging" mode.
6. Press .
1
Operation | BA� 4�� | 1� BA� 4�� | 1� | 1�
|
1 689 989 068 2012-10-30
en