CD5.243

CD-Series

DC/DC Converter 24V, 4A

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).

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.

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

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.

(b)

(a)

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 +49 89 9278 0

Germany

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