Switching On; Charging Mode - Bosch BAT 645 Original Instructions Manual

en 18 | BAT 645 | Operation
¶
Never short-circuit charging clips.
i
In the event of incorrect polarity and terminal short-
circuit no charging voltage is applied and an failure
indication appears.
5.2

Switching on

1. Connect the BAT 645 to the mains voltage system via
the power supply cable.
2. Switch on the BAT 645 via the on/off switch (fig. 1,
item 1).
 The red LED (fig. 1, item 7) lights up if the bat-
tery is connected or flashes if it is not connected.
i
After switching the device on or after resetting it to
factory settings, the "Language settings" menu is
displayed automatically.
i
After the BAT 645 is switched on, the voltage is
displayed when the battery is connected or if the
battery is not connected, the message "no battery
connected" appears.
i
The BAT 645 automatically detects whether a 12 V
or a 24 V battery (series connection of two 12 V
batteries) is connected.
Minimum voltage by mode
No mode (e.g. after switching the device on)
Charging
Charging (LFP)
Support
Buffering
Tab. 1: Battery detection
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5.3

Charging mode

Charging characteristics
Various charging characteristics and charging
parameters are stored in the BAT 645, depending on
the battery type. The figure below is an example which
shows the principle of a battery charging characteristic.
I
U
Fig. 3: Charging characteristic
Characteristic values for UNI battery type
I = 20% of set battery capacity
1
I = 2 of set battery capacity
2
U = 14.0 V (12 V), 28.0 V (24 V)
1
U = 14.2 V – 14.8 V (12 V), 28.4 V – 29.6 V (24 V)
2
U = 13.5 V / 27 V
3
12 V 24 V
3 V 17 V
Phase 1 (t1): Main charging, green LED flashes rapidly
3 V 17 V
The charging current I
9 V 18 V
battery capacity (60 % with LFP batteries). Once the
3 V 17 V
battery has attained the charging cut-off voltage U
9 V 18 V
charging current I
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
of the battery capacity. The battery is then approx. 97%
charged.
Phase 2 (t2): Secondary charging, green LED flashes
slowly
The charging current I
capacity. The charge voltage is limited to U
Phase 3 (t3): Trickle charging, green LED lights up
The charging current is always activated when the
battery voltage drops below U
remains active until the charging voltage U
again.
i
If the message "
phase could not be completed. This indicates that
either the parameter was entered incorrectly, or that
the battery is defective.
t2
t1
is approx. 20% of the set
1
starts to decrease. Approx. 65% of
1
drops below approx. 2%
1
is approx. 2% of the set battery
2
. The charging current
3
Time out " is displayed, a charging
I
1
U
2
U
1
U
3
I
2
t
t3
, the
1
.
2
is attained
1
Robert Bosch GmbH