Functional Description; Battery Types; Charging Procedure; Charging Characteristics - Elektro-Automatik BC 812-20R Bedienungsanleitung

Functional description

3. Functional description

3.1 Battery types

The battery chargers can be used to charge different
types of lead batteries, as for example lead-acid, gel
cell or AGM type. Any of the battery types are charged
according to a three-stage, temperature compensating
(only with temperature sensor connected) charging
procedure. The battery type can be selected by a push-
button on the front panel. The related charging profiles
mainly differ in the cell voltage (see table below).

3.2 Charging procedure

Attention! Defective batteries (U
can not be charged!
The charging procedure follows an I-U-U characteri-
stics.
In the first phase of the charging the battery is
precharged with reduced output current (0.1 x I
The precharge is very effective on deeply discharged
batteries with U = >0.4 x U
BatAct
possibility to repair and recharge them again. As soon
as the output voltage rises to 0.9 x U
maximum precharge time of 30 minutes, the procedure
changes to normal charge phase. Precharge and nor-
mal charge are indicated by the red LED of the traffic
light type display.
During normal charge, the battery is charged with full
output current I (or with a reduced to 30% output
Nom
current I-Limit).
After leaving the constant current charging or after a
maximum 6 hours charging time, the charging proce-
dure changes to boost charge (yellow LED).
Boost charge is done with increased charging voltage.
As soon as the charging current becomes <5% of I
or the boost charge phase time exceeds 1.5 times the
time of the normal charge phase, the charging proce-
dure changes to trickle charge.
When reached and if the charging current remains
below 5% I , the battery is indicated as fully charged
Nom
by the green status LED.
During trickle charge, the battery is kept charged with
trickle charge voltage for an unlimited time, unless char-
ging is stopped or interrupted by any error or blackout.
Boost charge and trickle charge make use of the
temperature compensation, which is recommend in
order to prevent the batteries from gassing.
Tip: it is possible to manually reduce the output current
by activating the 30% I-Limit. This is done by pressing
the pushbutton „Charging Profiles" longer than 3s.
The I-Limit is useful when charging small batteries that
require lower charging currents.
18
Date: 03-20-2017
= <0.4 x U )
BatAct BatNom
).
Nom
, providing the
BatNom
or after a
BatNom
Nom
3.2.1

Charging characteristics

3.3 Battery supervision

The battery or batteries are connected to the desi-
gnated terminal „Battery" on the front. The output is
supervised for false polarity and wrong battery voltage.
In case the battery was connected with false polarity,
the battery voltage is too low or too high, the charging
is inhibited to start.
Attention! Only connect batteries whose battery volta-
ge matches the nominal charging voltage of the device.
Else the battery and/or the device might get damaged.

3.4 Temperature sensor

It is recommended to use temperature compensation
when charging batteries, in order to prevent dangerous
gassing.
Without the temperature sensor the batteries are
charged with voltages that correspond to an ambient
temperature of 25°C. The sensor is directly connected
to pins 1 and 6 of the analogue interface and has to
be placed in proximity of the battery or attached to the
battery. It is detected and used when the charging is
started. If the device measures temperatures above
+50°C, the charging is paused After cooling down to
<+45°C, the charging is automatically continued. This
© 2006, Elektro-Automatik GmbH & Co. KG
only works if the temperature sensor is attached. The
Irrtümer und Änderungen vorbehalten
error LED will only flash as long the battery overtem-
perature error persists.
At temperatures below -15°C, the temperature com-
pensation will halt. In case the sensor is removed
during charging or if damaged, the device continues
the charging procedure with a charge phase voltage
corresponding to 25°C.
EN
Instruction Manual
BC 800 R Series