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LOS, LOR, LOK4000 Series Data Sheet
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Thermal Considerations
DIN-Rail Mountable AC-DC (DC-DC) Converters
Output Power at Low Input Voltage
If an AC-DC converter is located in free, quasi-stationary air
(convection cooling) at the indicated maximum ambient
temperature T A max (see table: Temperature specifications ) and
is operated at its nominal input voltage and output power, the
temperature measured at the Measuring point of case
temperature T C (see Mechanical Data) will approach the
indicated value T C max after the warm-up phase. However, the
relationship between T A and T C depends heavily on the
conditions of operation and integration into a system. The
thermal conditions are influenced by input voltage, output
current, airflow, temperature of surrounding components and
surfaces. T A max is therefore, contrary to T C max , an indicative
value only.
The relation between the maximum allowed output power
The output power of LOK models must be derated at low input
voltage, see figure below.
P o allowed / P o nom
1.0
0.85
0.5
P o allowed and the temperature T A of the surrounding air is given
in the figure below. The rates apply if the AC-DC converter is
located in free, quasi-stationary air (convection cooling).
0
50
V i
75 100 125 150 175 200 225 250 275 300 VAC
Note: Sufficient forced cooling allows T A to be higher than the
value given in the table if T C max according to the table is not
exceeded.
Caution: The installer must ensure that under all operating
conditions T C remains within the limits that are stated in the table
Temperature specifications .
P o allowed / P o nom
1.0
0.5
0.45
Fig. 3
Maximum allowed output power versus input voltage at
T A = 50 °C for LOK models operated in vertical position
Output Protection
Battery charger versions LOK4140-, 4240-, LOK4740-2RLD,
and the LOK4001-2RLD have a rectangular current limitation
characteristic, which limits the output current to within 100 and
150% of I o nom . The other models are protected against
overload by a current limiting circuit, which shuts down the
converter in overload condition. It automatically restarts after
removal of the overload condition (hiccup mode).
All models are short-circuit and no-load proof.
Outputs Connected in Series
Two or more converters supplying the same or different output
voltages may be connected in series. The value of the
maximum output current to be taken is defined by that unit
providing the lowest current limiting value. It should be assured
0
–10
0
10
20
30
40
50
60
T A
70 °C
that the outputs do not feed backwards into each other caused
by their different rise/fall times at switch-on/off cycles by adding
Fig. 4
Maximum allowed output power versus ambient temperature
at V i >105 VAC for LOK models, operated in vertical position
reverse polarity diodes across each output.
Parallel Operation
Only possible with battery charger versions.
The outputs of several battery charger models with equal
output voltage (e.g. several LOK4240-2RLD) may be
connected in parallel.
BCD20035-G Rev AB, 23-Jun-2011
Page 5 of 10
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