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Series Operation
Use in a Tightly Sealed
Enclosure
22
Figure 34 - Daisy Chain of Outputs
Power
Power
Supply
Supply
- -
- -
+ +
+ +
Output
Output
Max
54 A
Figure 36 - Series Operation
AC
AC
Earthing of the output is required when the sum of the output voltage is above
60V DC.
Avoid return voltage (for example, from a decelerating motor or battery) which
is applied to the output terminals.
Keep a left and right installation clearance of 15 mm (0.59 in.) between two
DC/DC converters and avoid installing the units on top of each other. Do not
use DC/DC converter units in series in mounting orientations other than the
standard mounting orientation (terminals on the bottom of the unit).
Understand that leakage current, EMI, inrush current, and harmonics
increase when using multiple DC/DC converters.
When the DC/DC converter is installed in a tightly sealed enclosure, the
temperature inside the enclosure is higher than outside of the enclosure. In
such situations, the inside temperature defines the ambient temperature for
the DC/DC converter.
The following measurement results can be used as a reference to estimate the
temperature rise inside the enclosure. These measurements are taken with the
DC/DC converter in the middle of the enclosure, with no other heat-producing
items inside the enclosure.
Rockwell Automation Publication 1606-RM047A-EN-P - September 2021
Load
-
+
Unit A
+
-
DC
+
Unit B
Load
+
-
-
DC
Earth
Figure 35 - Using Distribution Terminals
Distribution
Power
Power
Supply
Supply
- -
- -
+ +
+ +
Output
Output
DC/DC converters of the same type
can be connected in series for
higher output voltages. Connect as
many units in series as needed,
providing the sum of the output
voltage does not exceed 150V DC.
Voltages with a potential above
60V DC can be dangerous and are
no longer SELV. Such voltages must
be installed with a protection
against being touched.
Terminals
Load
-
+
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