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X Series Data Sheet
Parallel Operation
?
375, 500 Watt AC-DC and DC-DC DIN-Rail Converters
11053a
Double-output models exhibit an independent
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
AUX1 10
Vo- 9
Vo- 8
V R
the 2 nd output. The two pairs of powertrains 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 converters.
Reasonable current sharing is achieved by the
droop characteristic. Correct mode of operation is
highly dependent upon the wiring 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
V i
Vo+ 7
Vo+ 6
Vo- 5
Vo- 4
Vo+ 3
Vo+ 2
AUX1 10
Vo- 9
achieved with the wiring shown in fig. 6.
Parallel operation of single-output models using
option R (output voltage adjust) is possible, but not
recommended. Refer to fig. 6; the connections
between the pins 8 and 9 (both Vo –) should be as
short as possible.
Note : Parallel operation is not possible, if a
V i
Vo- 8
Vo+ 7
Vo+ 6
Vo- 5
Vo- 4
Vo+ 3
Vo+ 2
+
Load
_
temperature sensor is connected, as the sensor
eliminates the output voltage droop.
Series Connection
Series connection of several outputs up to 150 V is
possible. The output is not SELV, when the max.
AUX1 10
Vo- 9
output voltage exceeds 60 V.
Output Characteristic and Protection
The output characteristic, individual for each group
of powertrains, is rectangular with a droop to ease
V i
Vo- 8
Vo+ 7
Vo+ 6
Vo- 5
Vo- 4
parallel operation; see fig. 7.
However, a 50% higher output current is possible
for a short time, such allowing start-up of loads or
Vo+ 3
Vo+ 2
Additional wiring for output currents I o ≥ 10 A
Additional wiring, if using the R-input
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
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.
respective output is disabled.
Overtemperature Protection
Each powertrain is independently protected against over-
temperature by a built-in temperature sensor. When a certain
temperature is reached, the concerned powertrain reduces
its output power continuously.
V o / V o nom
1.0
0.8
0.6
0.4
0.2
05181a
0
0
Fig. 7
0.2
0.4
0.6
0.8
1.0
1.2
I o / I o nom
V o versus I o (single-output model, typical values).
BCD20021-G Rev AC1, 13-May-2013
Page 10 of 21
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