Buffer Mode; Back-Up Mode - Bosch BAT 645 Original Instructions Manual

en 20 | BAT 645 | Operation
5.4

Buffer mode

In buffer mode, the BAT 645 maintains the battery
charge if electrical equipment has to be powered with
the engine stopped. The output voltage of the BAT 645
is a smooth DC voltage and is therefore suitable for
buffering the vehicle electrical system with the vehicle
battery.
!
When operating an LFP battery in buffer mode, the
instructions of the battery manufacturer must be
observed when entering the parameters (see sec.
6.1.1).
i
The charger only supplies power to the charging
clips once correct battery voltage polarity has been
detected.
1. Connect the BAT 645 to the mains voltage system via
the power supply cable.
2. Connect the red charging clip to the battery positive
terminal (+).
3. Connect the black charging clip to the battery negative
terminal (–).
4. Switch on the BAT 645 by way of the on/off switch
(fig. 1, item 1).
 The red LED (fig. 1, item 3) lights up.
 The battery voltage is displayed (for four sec-
onds) then the "Mode" menu appears.
5. Select "Buffer mode" with
6. Press .
 Yellow LED lights up (fig. 1, item 9).
 The battery is buffered after detection of the bat-
tery voltage (at least 9 V for 12-V batteries and
18 V for 24-V batteries).
Fig. 5: Buffer mode
1 Voltage and current actual values
2 Information on the selected mode, charging cable length and
parameter settings
!
Buffer mode is terminated on disconnecting the
charging clips.
i
The parameter settings are selected in the
"Configuration >> Parameter" menu (see sec. 6.1).
7. Buffer mode is stopped with
 The yellow LED is off.
 The "Mode" menu is displayed.
8. Switch off the BAT 645 on completion of buffer
mode.
9. Remove the charging clips from the battery.
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or .
.
5.5

Back-up mode

In back-up mode, the BAT 645 can power the electrical
equipment in a vehicle instead of a battery. Back-up mode
can be used for example to maintain a supply of power
to the electrical equipment in a car when changing a
battery. The output voltage of the BAT 645 is a smooth DC
voltage and is therefore suitable for back-up of the vehicle
electrical system even without a vehicle battery.
i
The charger only supplies power to the charging
clips once correct battery voltage polarity has been
detected.
1. Connect the BAT 645 to the mains voltage system via
the power supply cable.
2. Connect the red charging clip to the battery positive
terminal (+).
3. Connect the black charging clip to the battery negative
terminal (–).
4. Switch on the BAT 645 via the on/off switch (fig. 1,
item 1).
 The red LED (fig. 1, item 3) lights up.
 The battery voltage is displayed (for four seconds)
then the "Mode" menu appears.
5. Select "Back-up mode" with
6. Press .
 Yellow LED flashes (fig. 1, item 9).
 The vehicle voltage is supported after detection
of a battery voltage (at least 3 V for 12-V batteries
and 17 V for 24-V batteries).
 The vehicle battery can be changed.
Fig. 6: Back-up mode
1 Voltage and current actual values
2 Information on the selected mode, charging cable length and
parameter settings
!
In this mode, voltage is still present at the charging
clips even after they have been disconnected or the
battery has been removed. When reinstalling the
battery, it is important that the battery clamps are
connected to the right poles as otherwise this could
damage the BAT 645.
i
The parameter settings are selected in the
"CONFIGURATION >> PARAMETER" menu (see sec. 6.1).
7. Back-up mode is stopped with
 The yellow LED is off.
 The "Modes" menu is displayed.
8. Switch off the BAT 645 on completion of back-up mode.
9. Remove the charging clips from the battery.
or .
.
Robert Bosch GmbH