BEL Melcher X Series Manual page 11

X Series
375, 500 Watt AC-DC and DC-DC DIN-Rail Converters
Parallel Operation
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 the 2
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
best results for parallel operation can be 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 temperature sensor is connected, as the sensor eliminates the output voltage droop.
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.
Series Connection
Series connection of several outputs up to 150 V is possible. The output is not ES1, when the max. output voltage exceeds 60 V.
11053a
AUX1 10
Vo- 9
Vo- 8
Vo+ 7
V
i
Vo+ 6
Vo- 5
Vo- 4
Vo+ 3
Vo+ 2
AUX1 10
Vo- 9
Vo- 8
V
Vo+ 7
i
Vo+ 6
Vo- 5
Vo- 4
Vo+ 3
Vo+ 2
AUX1 10
Vo- 9
Vo- 8
V
Vo+ 7
i
Vo+ 6
Vo- 5
Vo- 4
Vo+ 3
Vo+ 2
© 2021 Bel Power Solutions & Protection
output. The two pairs of powertrains share the
nd
V
R
+
_
Additional wiring for output currents I
o
Additional wiring, if using the R-input
Load
≥ 10 A
tech.support@psbel.com
belfuse.com/power-solutions
BCD20021-G Rev AF, 29 November 2021
Page 11 of 26
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