UB10.245

U–Series

Input voltage

nom.

DC 24V

Input voltage ranges

nom.

22.5 to 30Vdc

Continuous operation, see Fig. 5-1

30 to 35Vdc

Temporarily allowed, no damage to the DC-UPS *)

35Vdc

Absolute maximum input voltage with no damage to the

DC-UPS

0 to 22.5Vdc

The DC-UPS switches into buffer mode and delivers

output voltage from the battery if the input was above

the turn-on level before and all other buffer conditions

are fulfilled.

Allowed input voltage ripple

max.

1.5Vpp

Bandwidth <400Hz

1Vpp

Bandwidth 400Hz to 1kHz

Allowed voltage between input

and earth (ground)

max.

60Vdc or

42.4Vac

Turn-on voltage

typ.

max.

22.8Vdc

23Vdc

The output does not switch on if the input voltage does

not exceed this level.

Input current **)

typ.

140mA

Internal current consumption

typ.

1.1A

Current consumption for battery charging in constant

current mode at 24V input See Fig. 8-2 ***)

External capacitors on the input

No limitation

*)

The DC-UPS shows “Check Wiring” with the red LED and buffering is not possible

**) The total input current is the sum of the output current, the current which is required to charge the battery during the

charging process and the current which is needed to supply the DC-UPS itself. See also Fig. 5-2. This calculation does not apply

in overload situations where the DC-UPS limits the output current, therefore see Fig. 5-3.

***) Please note: This is the input current and not the current which flows into the battery during charging. The battery current can

be found in chapter 8.

Fig. 5-1 Input voltage range

Fig. 5-2 Input current, definitions

A: Rated input voltage range

B: Temp. allowed, no harm to the unit

C: Absolute max. input voltage

D: Buffer mode

V

IN

18

30

35V

22.5

0

AB

C

D

V

OUT

Internal

current

consumption

Current

consumption

for battery

charging

Output

Current

Input

Current

Fig. 5-3 Input current vs. 24V output current,

typ. (battery fully charged)

Electronic output current limitation

The DC-UPS is equipped with an electronic output

current limitation. This current limitation works in a

switching mode which reduces the power losses and

heat generation to a minimum. As a result, the

output voltage drops since there is not enough

current to support the load. A positive effect of the

current limitation in switching mode is that the input

current goes down despite an increase in the output

current resulting in less stress for the supplying

source.

0

0

5

10

15

20A

Output Current

48

12

20A

Output Voltage

15

20V

Overload

Inp

ut

Cu

rre

nt

10

3/24

Fig. 5-3 shows the behavior when the 12V is

not loaded. Power which is taken out from the 12V

reduces the power on the 24V side.

June. 2010 / Rev. 1.1 Datasheet DS-UB10.245-EN

All parameters are specified at an input voltage of 24V, 10A output load, 25°C ambient and after a 5 minutes run-in time

unless otherwise noted. It is assumed that the input power source can deliver a sufficient output current.

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