Datasheet

CPS20.481-D1
C-Series
48V, 10A, DC/DC CONVERTER
22.9. CHARGING OF BATTERIES
The DC/DC converter can be used to charge lead-acid or maintenance free batteries. (Four 12V batteries in series)
Instructions for charging batteries:
a) Set output voltage (measured at no load and at the battery end of the cable) very precisely to the end-of-charge
voltage.
End-of-charge voltage 55.6V 55.0V 54.3V 53.6V
Battery temperature 10°C 20°C 30°C 40°C
b) Use a 15A or 16A circuit breaker (or blocking diode) between the DC/DC converter and the battery.
c) Ensure that the output current of the DC/DC converter is below the allowed charging current of the battery.
d) Use only matched batteries when putting 12V types in series.
e) The return current to the DC/DC converter (battery discharge current) is typ. 7mA when the DC/DC converter is
switched off (except in case a blocking diode is utilized).
22.10. 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 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 9522 100, plastic, 254x180x165mm
Load: 48V, 8A; (=80%) load is placed outside the box
Input: 300Vdc
Temperature inside enclosure: 50.3°C (in the middle of the right side of the DC/DC converter with a distance of 2cm)
Temperature outside enclosure: 24.2
Temperature rise: 25.8K
Apr. 2014 / Rev. 1.3 DS-CPS20.481-D1-EN
All parameters are specified at 48V, 10A, 300Vdc, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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