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W Series Data Sheet
?
125, 250 Watt AC-DC and DC-DC DIN-Rail Converters
I o / I o nom
1.6
1.4
1.2
1.0
0.8
05194b
allows for connecting a battery-specific temperature sensor,
which provides temperature controlled adjust of the trickle
charge voltage. This optimizes charging as well as battery life
time. Depending upon the cell voltage and the temperature
coefficient of the battery, different sensor types are available;
see Accessories .
Note : Parallel operation is not possible, if the temperature sensor
is connected to the paralleled outputs Vo+, as the sensor
eliminates the output voltage droop.
0.6
- 0.5
0
0.5
1
1.5
2
2.5 s
However, it is possible to insert bleeding resistors in the Vo+
output lines of each converter in order to create a droop of approx.
Fig. 8
Short term peak power characteristic: overcurrent versus
time (typical values).
certain temperature is reached, the concerned powertrain
0.6 V @ I o nom for 24 V outputs (1.2 V @ I o nom for 48V outputs), but
this creates considerable power losses.
reduces its output power continuously.
Thermal Considerations
The thermal conditions are influenced by input voltage, output
Input
Power
supply
Vo+
Vo–
R
03099d
Load
current, airflow, and temperature of surrounding components.
T A max is therefore, contrary to T C max , an indicative value only.
Caution: The installer must ensure that under all operating
conditions T C remains within the limits stated in the table
Temperature specifications .
?
+
Note: Sufficient forced cooling allows T A to be higher than T A max
provided that T C max is not exceeded. It is recommended that
continuous operation under worst case conditions of the
following 3 parameters be avoided: Minimum input voltage,
maximum output power, and maximum temperature.
Battery Charging and Temperature Sensor
The battery charger models exhibit the option M1 and have
been designed to charge lead-acid batteries. The R-input
Temperature sensor Battery
Fig. 10
Schematic circuit diagram of a system with battery backup
and temperature-controlled charging.
Cell voltage [V]
2.45
2.40
2.35
2.30
2.25
2.20
2.15 V o safe
06139b
2.10
–20
–10
0
10
20
30
40
50 °C
V C = 2.27 V, –3 mV/K
V C = 2.23 V, –3 mV/K
V C = 2.27 V, –3.5 mV/K
V C = 2.23 V, –3.5 mV/K
Fig. 9
Trickle charge voltage versus temperature for different
temperature coefficients (V o safe with disconnected sensor)
BCD20020-G Rev AC, 31-Jan-2013
Page 12 of 25
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