Puls CD5.121 DC/DC Converter Specification Guide
CD5.121
CD-Series
DC/DC Converter 12V, 8A
22.9. D
AISY
C
HAINING OF
O
UTPUTS
Daisy chaining (jumping from one DC/DC-converter output to the next) is allowed as long as the average output
current through one terminal pin does not exceed 25A. If the current is higher, use a separate distribution terminal
block.
current through one terminal pin does not exceed 25A. If the current is higher, use a separate distribution terminal
block.
Fig. 22-4 Daisy chaining of outputs
Fig. 22-5 Using distribution terminals
DC/DC
Converter
+ +
- -
Input
Output
Load
+
-
max 25A!
DC/DC
Converter
+ +
- -
Input
Output
Load
+
-
Distribution
Terminals
DC/DC
Converter
+ +
- -
Input
Output
DC/DC
Converter
+ +
- -
Input
Output
22.10. S
ERIES
O
PERATION
DC/DC converters of the exact same type can be connected in series for higher
output voltages. It is possible to connect as many units in series as needed,
providing the sum of the output voltage does not exceed 150Vdc. Voltages with
a potential above 60Vdc are not SELV any more and can be dangerous. Such
voltages must be installed with a protection against touching. Earthing of the
output is required when the sum of the output voltage is above 60Vdc. Avoid
return voltage (e.g. from a decelerating motor or battery) which is applied to the
output terminals. Keep an installation clearance of 15mm (left / right) between
two DC/DC-converters and avoid installing the DC/DC-converters on top of each
other. Do not use DC/DC-converters in series in mounting orientations other than
the standard mounting orientation (input terminals on the bottom and output terminals on top of the unit).
output voltages. It is possible to connect as many units in series as needed,
providing the sum of the output voltage does not exceed 150Vdc. Voltages with
a potential above 60Vdc are not SELV any more and can be dangerous. Such
voltages must be installed with a protection against touching. Earthing of the
output is required when the sum of the output voltage is above 60Vdc. Avoid
return voltage (e.g. from a decelerating motor or battery) which is applied to the
output terminals. Keep an installation clearance of 15mm (left / right) between
two DC/DC-converters and avoid installing the DC/DC-converters on top of each
other. Do not use DC/DC-converters in series in mounting orientations other than
the standard mounting orientation (input terminals on the bottom and output terminals on top of the unit).
Unit A
Input
Output
Unit B
-
+
-
+
+
-
Input
Output
Load
22.11. U
SE IN A
T
IGHTLY
S
EALED
E
NCLOSURE
When the DC/DC-converter is installed in a tightly sealed enclosure, the temperature inside the enclosure will be
higher than outside. In such situations, the inside temperature defines the ambient temperature for the DC/DC-
converter.
higher than outside. 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.
The DC/DC-converter is placed in the middle of the box, no other heat producing items are inside the box
Enclosure:
Rittal Typ IP66 Box PK 9516 100, plastic, 110x180x165mm
Load:
12V, 6.4A; (=80%) load is placed outside the box
Input:
24Vdc
Temperature inside enclosure:
48.0°C (in the middle of the right side of the DC/DC converter with a distance of 2cm)
Temperature outside enclosure: 22.6°C
Temperature rise:
Temperature rise:
25.4K
Oct 2009 / Rev. 1.3 DS-CD5.121-EN
All parameters are specified at 12V, 8A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
All parameters are specified at 12V, 8A, 24Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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20/21