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W Series Data Sheet
Parallel Operation
?
125, 250 Watt AC-DC and DC-DC DIN-Rail Converters
11054b
Double-output models exhibit an independant
control logic each. Both outputs can be
connected in parallel, provided that the
options S (included in M1) and R are not used,
since they influence only the 2 nd output. The
two power trains share the current due to their
output voltage droop characteristic.
Up to 3 converters with the same output
voltage may be operated in parallel. It is
possible to parallel W Series with X Series
V i
AUX 10
Vo- 9
Vo- 8
Vo+ 7
Vo+ 6
Vo- 5
Vo- 4
Vo+ 3
Vo+ 2
V R
converters.
Reasonable current sharing is achieved by
the droop characteristic. Correct mode of
operation is highly dependent upon the wiring
AUX 10
of the converters and the impedance of these
wires. Use wires with equal length and equal
cross sections of min. 1.5 mm 2 . The best
results for parallel operation can be achieved
with the wiring shown in fig. 6.
Parallel operation of single-output models
using the option R (output voltage adjust) is
possible, but not recommended. Refer to fig.
6; the connections between the pins 8 and 9
V i
Vo- 9
Vo- 8
Vo+ 7
Vo+ 6
Vo- 5
Vo- 4
Vo+ 3
Vo+ 2
+
Load
_
(both Vo –) should be as short as possible.
Note : Parallel operation is not possible, if a
temperature sensor is connected, as the
sensor eliminates the output voltage droop.
Note : For ORing diodes, we recommend to
use Schottkydiodes, mounted on a commun
AUX 10
Vo- 9
heatsink to avoid thermal run away (or the use
of double diodes).
Series Connection
V i
Vo- 8
Vo+ 7
Vo+ 6
Vo- 5
Series connection of several outputs up to 150
V is possible. Exceeding an output voltage of
60 V, the output is not SELV.
Vo- 4
Vo+ 3
Vo+ 2
Additional wiring for output currents I o ≥ 10 A
Additional wiring, if using the R-input
Output Characteristic and Protection
The output characteristic, individual for each
powertrain, is rectangular with a droop to ease
parallel operation; see fig. 7.
However, a 50% higher output current is
Fig. 6
Wiring for single-output converters connected in parallel. Additional wiring
for higher output currents and with the use of option R is shown.
possible for a short time, such allowing start-
up of loads or charging of capacitors; see fig.
8.
Each output is independently protected against internal
overvoltage by means of a second control loop. When the
output voltage exceeds V o L , the respective output is disabled.
Overtemperature Protection
A built-in temperature sensor protects each powertrain is
V o / V o nom
1.0
0.8
0.6
0.4
0.2
05181a
independently protected against overtemperature. When a
0
0
0.2
0.4
0.6
0.8
1.0
1.2
I o / I o nom
Fig. 7
V o versus I o (single-output model, typical values).
BCD20020-G Rev AC, 31-Jan-2013
Page 11 of 25
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