CD5.243 Datasheet, PDF (19/22 Pages) PULS GmbH – DC/DC Converter

CD-Series
CD5.243
DC/DC Converter 24V, 4A
21.4. CHARGING OF BATTERIES
The DC/DC converter can be used to charge lead-acid or maintenance free batteries. (Two 12V batteries in series)
Instructions for charging batteries:
a) Ensure that the ambient temperature of the DC/DC converter is below 45°C
b) Do not use DC/DC converters in mounting orientations other than the standard mounting orientation (input
terminals on the bottom and output terminals on top of the unit).
c) 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
27.8V
27.5V
27.15V
26.8V
Battery temperature
10°C
20°C
30°C
40°C
d) Use a 6A or 10A circuit breaker (or blocking diode) between the DC/DC converter and the battery.
e) Ensure that the output current of the DC/DC converter is below the allowed charging current of the battery.
f) Use only matched batteries when putting 12V types in series.
g) The return current to the DC/DC converter (battery discharge current) is typ. 18mA when the DC/DC converter is
switched off (except in case a blocking diode is utilized).
21.5. EXTERNAL INPUT PROTECTION
The unit is tested and approved for branch circuits up to 50A. An external protection is only required, if the supplying
branch has an ampacity greater than this. Check also local codes and local requirements. In some countries local
regulations might apply.
If an external fuse is necessary or utilized, minimum requirements need to be considered to avoid nuisance tripping of
the circuit breaker. A minimum value of 16A B- or C-Characteristic breaker should be used.
21.6. 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. 21-3.
Fig. 21-3 External input filter requirements to
avoid filter instabilities
Resistance of the
supplying network
1 Ohm
(a) _(b)
100 mOhm
10 mOhm
(a) max.
(b) typ.
1 mOhm
0.1mH
1mH
10mH
Inductance of the supplying network
Mar. 2016 / Rev. 1.3 DS-CD5.243-EN
All parameters are specified at 24V, 4A, 12Vdc input voltage, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone [phone] Germany
19/22