DC input

The input can be powered from batteries or similar DC sources and must be a PELV or SELV source or an "Isolated Secondary Circuit" in order to maintain a SELV or PELV output.

DC input

DC input

Nom.

DC 24V

-25%/+46%

DC input range

 

18.0-35.0Vdc

 

Allowed voltage between input and earth/ground

Max.

60Vdc or
42.2Vac

according to IEC 62477-1

Allowed input ripple voltage

Max.

5Vpp

In the frequency range from 47 to 500Hz, the momentary input voltage must always be within the specified limits.

Turn-on voltage

Typ.

17.5Vdc

Steady-state value, see Fig. “Input voltage range”

Shut-down voltage

Typ.

15.5Vdc

Steady-state value, see Fig. “Input voltage range”

Input current

Typ.

10.5A

At 24Vdc input and 24V, 10A output load , see Fig. “Input current vs. output load”

14.3A

At 18Vdc input and 24V, 10A output load , see Fig. “Input current vs. output load”

Start-up delay

Typ.

150ms

See Fig. “Input voltage range”

Rise time

Typ.

110ms

At 24V, 10A constant current load, 0mF load capacitance, see Fig. “Turn-on behavior, definitions”

250ms

At 24V, 10A constant current load, 10mF load capacitance, see Fig. “Turn-on behavior, definitions”

Turn-on overshoot

Max.

250mV

See Fig. “Turn-on behavior, definitions”

Input capacitance

Typ.

4 300µF

Installed inside the device, external capacitors on the input are allowed without any limitations.

External input protection

 

Non-user replaceable slow blow, high breaking capacity fuse.
See chapter “Further notes on installation requirements

DC input 1:
Input voltage range, Turn-on behavior, definitions
DC input 2:
Input current vs. output load

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. “External input filter requirements to avoid filter instabilities”.

DC input 3:
External input filter requirements to avoid filter instabilities