Würth BLG 12-25 Workshop Notice D'utilisation page 12

Wear hand protection
Hands and arms must be protected when
working with batteries as there may be
contact with battery acid.
For indoor use only
Due to its design (protection class), this
device may be used in dry indoor areas only.
Protection class II
This is a class II appliance (protected by
double or reinforced insulation)
Connect to electrical circuits with
adequate fuse protection only
The current required by the appliance can be
very high (see Technical Data). The electrical
circuit the device is connected to must have
adequate fuse protection.
Protection class IP20
This device is protected against ingress
of solid particles (D > 12.5 mm). It is not
protected against ingress of liquids in any
manner.
ABOUT THE CHARGER
This charger can be used to charge all standard
12 V lead-acid batteries (wet-cell and start/stop
batteries). It must not be used to charge lithium
batteries. The charger is suitable for use with batteries
with capacities from 30 Ah to 500 Ah and can be
used without time limitation for charging and float
charging. The charger is less suitable for showroom
use due to the fan noise emitted. An external sensor
provides temperature correction of the charging
voltage.
CHARGING GRAPH
The charging graph shows voltage (U) over time (t)
and current (I) over time (t). It applies to charging
operations carried out at an exterior temperature of
25°C. (see fig. E, page 4):
Initial analysis: battery status is analysed
Bulk charge: up to 14.4/14.7 V at 25°C and 25 A
Full charge: on reaching 14.4/14.7 V at 25°C,
charging current decreases to 2 A
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Post-charge analysis: checks whether battery
voltage falls below 12 V
Float charge: 13.6 V, maximum charging current
25 A, decreasing to 1 A
Float at 13.6 V, maximum charging current 25 A
Restart: charging cycle restarted
INITIAL ANALYSIS
The charger checks whether the battery is correctly
connected. The battery's charge level (V) and total
capacity (Ah) are measured to determine the correct
charging profile. Charge status is shown on the LED
display (see table, page 2).
BULK CHARGE AND FULL CHARGE
The charger begins to charge the battery at a constant
current to 14.4/14.7 V (at 25°C). The charging
voltage is then kept at a constant 14.4/14.7 V while
the charge current is reduced until it falls below
a defined value. The charging voltage then falls to
13.6 V before the float charge phase begins. During
charging, charging status is shown by the number
of LEDs illuminated. The flashing segment above the
LEDs shows that charging is in progress. When the
battery is fully charged, all 5 LED segments remain
illuminated constantly. If battery voltage is below 2 V,
the fault mode light will illuminate.
POST-CHARGE ANALYSIS
When the charging phase is complete, the charger
analyses the battery again. If the charger finds
a fault in the battery, the warning triangle will begin
to flash. Short circuits in individual cells can be
detected during the post-charge analysis.
This is not possible during initial analysis. If the battery
voltage falls below 12.0 V within two minutes, the
charger will enter fault mode. The charging operation
will be stopped.
FLOAT CHARGE
When the battery is fully charged, the charger will
deliver a charge of 13.6 V at 25°C and a voltage
of up to 25 A. All LEDs will pulsate to indicate this.