User manual

CD5.241, CD5.241-S1
CD–Series
DC/DC Converter; 24V, 5A
Jan. 08 / Rev. 1.1 DS-CD5.241-EN / All parameters are specified at 24V, 5A and 24Vdc input at 25°C ambient unless otherwise noted.
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27.10. REQUIREMENTS FOR THE SUPPLYING SOURCE
In certain circumstances, the input filter of the DC/DC converter can show a resonant effect which is caused by the
supplying network. Especially when additional external input filters are utilized, a superimposed AC voltage can be
generated on the input terminals of the DC/DC converter which might cause a malfunction of the unit. Therefore,
additional input filters are not recommended. To avoid the resonant effects, the minimal resistance of the supplying
network which depends on the inductance of the input network, shall be above the boundary curve in Fig. 27-9.
Fig. 27-9 Requirements for an input filter
stability
1 mOhm
10 mOhm
100 mOhm
1 Ohm
0.1mH 1mH 10mH
Inductance of the supplying network
Resistance of the
supplying network
(a) max.
(b) typ.
(
a
)
(
b
)
27.11. EXTERNAL INPUT PROTECTION
The unit is tested and approved for branch circuits up to 50A. External protection is only required if the supplying
branch has an ampacity greater than this. In some countries local regulations might apply so check local codes and
local requirements.
If an external fuse is necessary or utilized, a minimum value is required to avoid undesired tripping of the fuse.
B-Characteristic C-Characteristic
Ampacity max.
50A 50A
min. 10A 8A
27.12. USE IN A TIGHTLY SEALED ENCLOSURE
When the DC/DC converter is installed in a tightly sealed enclosure, the temperature inside the enclosure will be
higher than the outside. The inside temperature defines the ambient temperature for the DC/DC converter.
Results from such an installation:
DC/DC converter is placed in the middle of the box, no other heat producing equipment inside the box
Enclosure: Rittal Type IP66 Box PK 9516 100, plastic, 110x180x165mm
Load: 24V, 4A; (=80%) load is placed outside the box
Input: 24Vdc
Temperature inside the box: 42.8°C
(in the middle of the right side of the DC/DC converter with a distance of 2cm)
Temperature outside the box: 24.0°C
Temperature rise: 28.8K