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BAX 5675
WÄRTSILÄ JOVYREC PME
4 Mode of operation
The mode of operation depends on the usage of the device.
The entire device current flows into the battery when batteries are charged without a DC consumer.
The rectifying device, battery and consumer are switched in parallel when charging batteries and supplying
power to the DC consumers at the same time. The rectifying device supplies the consumers and keeps the
battery fully charged (conservation charging) when the mains voltage is present. The battery only assists with
supplying power when the load exceeds the rated device current. If the power fails, the battery takes over
supplying power to the consumers without interruption. Once power has been restored, the consumers are
again supplied by the device. The batteries are charged at the same time. The output current from the
rectifying device is limited here to its rated current. The difference between the rated device current and the
consumer current flows into the battery as charging current.
No batteries are connected if the DC consumers are supplied directly.
5 Characteristic curve
The voltage values below apply for PB cells and the values in brackets () for Bi-Cd cells.
The rectifying device operates with the IU characteristic curve as per DIN 41773. Unless specified otherwise in
the technical data, the device supplies its rated current up to a battery voltage of 2.23 V/Z (1.4 V/Z) at a
constant regulated level of /- 2 % (l characteristic curve). Once a level of 2.23 V/Z (1.4 V/Z) has been
reached, the current flowing into the battery decreases constantly. The battery voltage is maintained at a
constant level with a tolerance of +/- 1 % at this value (U characteristic curve / constant voltage).
The specified tolerances relate to the mains fluctuations of +15 to -20% and frequency changes of 45 – 66 Hz
in a temperature range of between -10 and +40 degrees C.
The following options are possible:
•
Manual heavy charging Uk2
•
Automatic heavy charging
- Voltage-controlled Lu or
- Voltage and time-controlled Lt
•
Manual transient charging with I characteristic curve.
Typical output characteristic curve
Device-specific values can be found in the specific technical data.
V/c
2.0
2.23
2.4
2.65
100
50
25
%In
Manual equalizing charging
with I charge
V/c
1.75
1.55
1.4
1.2
NiCd
Pb
Constant current
Constant
voltage
+2%
-2%
-1%
+1%
Man./aut. boost
charging
