Buffer Mode; Back-Up Mode - Bosch BAT 645 Originalbetriebsanleitung

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).
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 7) 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
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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5.5
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.
1. Connect the BAT 645 to the mains voltage system
2. Connect the red charging clip to the positive
3. Connect the black charging clip to the negative
4. Switch on the BAT 645 via the on/off switch (fig. 1,
5. Select "Back-up mode" with
6. Press
or .
Fig. 6:
1 Voltage and current actual values
2 Information on the selected mode, charging cable length and
!
i
.
7. Back-up mode is stopped with
8. Switch off the BAT 645 on completion of back-up
9. Remove the charging clips from the battery.

Back-up mode

via the power supply cable.
terminal clamp or, if present, the positive
connection for starting assistance.
terminal clamp or the body.
item 1).
 The red LED (fig. 1, item 7) lights up.
 The battery voltage is displayed (for four seconds)
then the "Mode" menu appears.
.
 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 batter-
ies and 17 V for 24-V batteries).
 The vehicle battery can be changed.
Back-up mode
parameter settings
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.
The parameter settings are selected in the
"Configuration >> Parameter" menu (see sec. 6.1).
 The yellow LED is off.
 The "Modes" menu is displayed.
mode.
or .
.
Robert Bosch GmbH