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Fig. 3 PCB 85254 Location of the wire jumpers S501 - S504 for altering mains voltage and position
of the output fuse F503
5. Battery charging
5.1 Charging the batteries in the battery modules DEM 316 or DEM 317
Once the charging unit has been connected to the battery module correctly, (see Section 3) and the mains
voltage is present the green LEDs (3) LINE VOLTAGE, BATTERY VOLTAGE and CHARGE CURRENT
light up. The charging current is indicated on the LC display (1), if switch (2) is in position A.
The battery is charged with constant charging current of approx. 4 A. As charging is completed, the
charging current decreases rapidly with rising back-e.m.f. of the battery. At the end of charging, the
charging current falls to a small floating current of approx. 1 mA/Ah of the capacity of the battary to the
loaded, a value which is permanently compatible for the battery. This value can vary with older batteries
in particular, amounting to between 0.5 mA and 10 mA per Ah.
Note: lf the connection is faulty, there is no charging current and the green LED (3) CHARGE
CURRENT does not light up. Please check all connections between the battery and the
charging unit, all fuses and the mains voltage.
The capacity retention of the battery takes place with a constant voltage of 27.3 V at 20°C. The charging
voltage is indicated by the LC display (1), if swith (2) is in position V. lf the ambient temperature deviates
from +20°C in standby mode, the charging voltage is adapted automatically, depending on the tempera-
ture. The temperature coefficient amounts to -40 mV/°C for a 24 V battery.
Note: The charging unit is designed for the connection to one battery module. A parallel
connection of batteries is not recommended. Batteries connected in parallel cannot be
monitored.
Attention: The charging circuit fuses CHARGE FUSES of the battery modules DEM 315 and DEM
316 must be exchanged for 7.5 A fuses if the charging unit DEM 313 is used. In the
event of a faulty fuse, no charging current flows and the green LED (3) CHARGE
CURRENT does not light up.
F 503
S 504
S 503
S 502
S 501
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