UB40.241
UB-Series
24V,
40A,
DC-UPS
Jun. 2020 / Rev.0.1 DS-UB40.241-EN All values are typical figures specified at 24Vdc input voltage, 40A output current in
power supply mode at 25°C ambient, no charging and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0 Germany
9/34
Setting of battery size
selector
12Ah
26Ah
38Ah
65Ah
100Ah
150Ah
Battery voltage
24V
24V
24V
24V
24V
24V
2x 12V batteries in series
Recommended battery sizes
12Ah -
17Ah
18Ah -
34Ah
35Ah -
50Ah
51Ah -
80Ah
81Ah -
130Ah
131Ah -
200Ah
Required min. battery
voltage for charging
2 x 7V
14V
2 x 7V
14V
Center-tap connected
Center-tap not connected
Below this voltage level, charging
does not start and the DC-UPS
reports “check wiring”
Charging current
3A
6A
In constant current mode
Reduced charging current
2A
2A
To avoid overloading of the power
supply, charging current is
automatically reduced when the input
current is larger than 40A
2A
2A
At battery temperatures above +50°C
or below -15°C
2A
2A
At battery voltages below 20V
2A
2A
At input voltages below 22.8V
End-of-charge-voltage
2 x13.25V
Center-tap connected,
no temperature sensor connected
26.5V
Center-tap not connected,
no temperature sensor connected
2x 13.1 to 14.2V (below +50°C), 2x 12.9 at 60°C
(13.6V applies for +20°C and changes with -18mV/°C)
Center-tap connected,
temperature sensor connected
26.2V to 28.4V (below +50°C), 25.8V (at +60°C)
(27.2V applies for +20°C and changes with -36mV/°C)
Center-tap not connected,
temperature sensor connected
Temperature range for
which the charging process is
enabled
-25°C to +60°C
Corresponds to the temperature
readings of the external temperature
sensor
Deep-discharge protection
10.6V
9.3V
21.2V
18.6V
10.6V
9.3V
21.2V
18.6V
10.6V
9.5V
21.2V
19.0V
10.7V
10.0V
21.4V
20.0V
10.8V
10.1V
21.6V
20.2V
10.9V
10.2V
21.8V
20.4V
At 0A, center-tap connected
At 40A, center-tap connected
At 0A, center-tap not connected
At 40A, center-tap not connected
Battery discharge current
60mA
60mA
In battery mode at no output current
Charging times:
The below listed charging time applies for a complete discharged battery until the DC-
UPS indicated “Ready” with the green status LED.
In practice, the charging time can be much shorter, since the battery is usually not completely discharged.
Battery charging time
Max.
4h
For a 12Ah battery in 12Ah setting
Max.
9h
For a 26Ah battery in 26Ah setting
Max.
11h
For a 65Ah battery in 65Ah setting
Max.
25h
For a 150Ah battery in 150Ah setting
An extensive longer charging time is most likely caused by a defective or outdated battery.
