User manual
UB10.241
U–Series
24V, 10A, DC-UPS
Apr. 2007 / Rev. 1.1 DS-UB10.241-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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7. OUTPUT IN BUFFER MODE
If the input voltage falls below a certain value (transfer threshold level), the DC-UPS starts buffering without any
interruption or voltage dips. Buffering is possible even if the battery is not fully charged.
Output voltage in buffer mode
nom. DC 24V Output voltage is stabilized and independent from
battery voltage
22.45V ±1%, at no load,
22.25V ±1%, at 10A output current
Transfer threshold for buffering
typ. 80mV higher than the output voltage in buffer mode
Ripple and noise voltage max. 20mVpp 20Hz to 20MHz, 50Ohm
Output current nom. 10A Continuously allowed
15A < 5s with full output voltage *)
Short-circuit current min. 17.9A Load impedance 100mOhm **)
max. 21A Load impedance 100mOhm **)
*) If the output current is in the range between 10A and 15A for longer than 5s, a hardware controlled reduction of the
maximal output current to 10A occurs. If the 10A are not sufficient to maintain the 24V, buffering stops after another 5s. The
buffering is possible again as soon as the input voltage recovers.
**) If the nominal output voltage cannot be maintained in buffer mode, the DC-UPS switches off after 5s to save battery
capacity.
Fig. 7-1 Buffering transition, definitions Fig. 7-2 Transfer behavior, typ.
Buffer mode
Output
voltage
24V
28V
Input
voltage
t
t
Transfer
threshold
5
0
0
m
s
/
D
I
V
0
V
O
u
t
p
u
t
V
o
l
t
a
g
e
I
n
p
u
t
V
o
l
t
a
g
e
2
4
V
2
2
.
2
5
V
a
t
1
0
A
2
4
V
Fig. 7-3 Available output current in buffer
mode
Fig. 7-4 Output voltage vs. output current in
buffer mode, typ.
Output
Current
0
05 Sec.
15A
10A
Time
5A
BonusPower
®
Output Voltage
A
B
C
Continuously available
Available for 5s then auto switching to curve
Buffering will stop after 5s
D
0
0
5101520
5
10
15
25V
20
25
A
Output
Current
A B
CD
D
Buffering will stop after 5s