Datasheet

PRELIMINARY
UB20.241
U–Series
24V, 20A, DC-UPS
Fig. 27-1 Service life versus ambient
temperatures, typ *)
Fig. 27-2 Cell capacity degradation vs. discharging
cycles *)
20°C
10
30°C 35°C
40°C
45°C
8
6
4
2
Ambient Temperature
25°C
1
3
5
7
9
Service Life in Years
Design Life
of Battery
A: 3-5 Years
B: 6-9 Years
C: 10-12 Years
A
B
C
0
120%
100%
40%
20%
Number of Discharging Cycles
200
60%
80%
Cell Capacity
Depth of
discharge
A: 100%
B: 50%
C: 30%
400 600 800 1000 1200
A
B
C
*) datasheet figures from battery manufacturer
27.2. USING THE INHIBIT INPUT
The inhibit input disables buffering. In normal mode, a static signal is required. In buffer mode, a pulse with a
minimum length of 250ms is required to stop buffering. The inhibit is not stored. If the voltage on the inhibit input is
lower than 6Vdc the unit continues buffering.
As long as the inhibit signal is active in normal mode, an internal relay contact will be opened and the battery will
not longer be charged.
For service purposes, the inhibit input can also be used to connect a service switch. Therefore, the inhibit signal can
be supplied from the output of the DC-UPS.
Fig. 27-3 Wiring example for inhibit input
12V
Battery
Module
+
-
Service Switch
Center
Tap
24V
Power
Supply
+
-
UB20
BAT
24V
+
-
Inhibit
12V
Battery
Module
+
-
Buffered
Load
+
-
+
-
24V
IN
24V
OUT
+
-
+
-
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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20/23