Datasheet

PRELIMINARY
UB20.241
U–Series
24V, 20A, DC-UPS
5. INPUT
Input voltage
nom. DC 24V
Input voltage ranges
nom. 23.3 to 30Vdc Continuous operation, see Fig. 5-1
1
30 to 35Vdc Temporarily allowed, no damage to the DC-UPS
2
35Vdc Absolute maximum input voltage with no damage to the
DC-UPS
Threshold voltage for buffer-mode
typ. Identical with
buffer voltage
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.
3
Turn-on voltage
typ. 23Vdc The output does not switch on if the input voltage does
not exceed this level.
max 23.3Vdc
Input current
4
typ. 70 mA Internal current consumption for the DC-UPS
typ.
typ.
1.2A
2.4A
Current consumption for battery charging in constant
current mode at 24V input
at battery selector position <10Ah
at battery selector position >10Ah
External capacitors on the input
No limitation
1) It is recommended, to set the input voltage 0.8V higher than the buffer voltage.
2) The DC-UPS shows “Check Wiring” with the red LED and buffering is not possible
3) The threshold depends on the selected buffer voltage.
4) 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.
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 35V23.30
AB
C
D
V
OUT
24.8
25.8
26.8
Internal
current
consumption
Current
consumption
for battery
charging
Output
Current
Input
Current
6. OUTPUT IN NORMAL MODE
At normal operation the supplying source is directly connected to the output of the DC-UPS via a MOSFET. The
output behavior in normal mode is the same as the supplying source. Please refer to the datasheet of the power
supplies for detailed information. The maximum continuous allowed output current is 25A.
Output voltage in normal mode typ. 0.15V lower
as input
voltage
At 20A output current
If the rated output current of the supplying source is higher than 28A, it is necessary to use a 25A fuse between the
power supply and the DC-UPS.
September 2012 / Rev. 1.3 DS-UB20.241-EN preliminary
All parameters are specified at an input voltage of 24V, 20A 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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