Datasheet

CT5.121
C-Series
12V, 8A, TWO-PHASE INPUT
23.8. DAISY CHAINING OF OUTPUTS
Daisy chaining (jumping from one power supply 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.
Fig. 23-3 Daisy chaining of outputs Fig. 23-4 Using distribution terminals
Power
Supply
+ +
- -
Input
Output
Load
+
-
max 25A!
Power
Supply
+ +
- -
Input
Output
Load
+
-
Distribution
Terminals
Power
Supply
+ +
- -
Input
Output
Power
Supply
+ +
- -
Input
Output
23.9. SERIES OPERATION
Earth
Unit A
AC
DC
Unit B
AC
DC
-
+
-
+
Load
+
-
Power supplies of the 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 power supplies and avoid installing the power supplies on top of
each other. Pay attention that leakage current, EMI, inrush current, harmonics
will increase when using multiple power supplies.
23.10. USE IN A TIGHTLY SEALED ENCLOSURE
When the power supply 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 power supply.
The following measurement results can be used as a reference to estimate the temperature rise inside the enclosure.
The power supply 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: 2x 400Vac
Temperature inside enclosure: 51.1°C (in the middle of the right side of the power supply with a distance of 2cm)
Temperature outside enclosure: 25.2°C
Temperature rise: 25.9K
Jan. 2010 / Rev. 1.0 DS-CT5.121-EN
All parameters are specified at 12V, 8A, 400Vac, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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20/21