Puls UB10.241 UPS Guia De Especificação

UB10.241 

 

  U–Series 

24V, 10A, DC-UPS 

 

 

 

8.  B

ATTERY 

I

NPUT

 

 

The DC-UPS requires one 12V VRLA battery to buffer the 24V output. 

Battery voltage 

nom. 

DC 12V 

Use one maintenance-free 12V VRLA lead acid battery or 
one battery module which is listed in the chapter 
accessories. 

 

 

9.0 – 15.0V 

Continuously allowed, except deep discharge protection 

  Battery voltage range 
   

max. 

35Vdc 

Absolute maximum voltage with no damage to the unit 

typ. 

7.4V 

Above this voltage level battery charging is possible 

   

  Allowed battery sizes 

min. 3.9Ah 

 

   

max. 40Ah 

 

max. 100mOhm  See 

individual 

battery datasheets for this value 

  Internal battery resistance 

  Battery charging method 

 

CC-CV 

Constant current, constant voltage mode 

  Battery charging current (CC-mode) 

nom. 

1.5A 

Independent from battery size,  

max. 

1.7A 

Corresponding 24V input current see Fig. 8-2

   

 End-of-charge-voltage 

(CV-mode) 

 

13.4-13.9V 

Adjustable, see chapter 14

  Battery charging time 

typ. 

5h *) 

For a 7Ah battery 

   

typ. 

17h *) 

For a 26Ah battery 

Battery discharging current **) 

typ. 

21A 

Buffer mode, 10A output current, 11.5V on the battery 
terminal of the DC-UPS, see 

 

Fig. 8-1 for other parameters 

   

typ. 

0.3A 

Buffer mode, 0A output current 

max. 50μA 

At no input, buffering had switched off, all LEDs are off 

   

typ. 

270mA 

At no input, buffering had switched off, yellow LED 
shows “buffer time expired” (max. 15 minutes) 

   

typ. 

10.5V 

At 0A output current 

  Deep discharge protection ***) 
   

typ. 

9.0V 

At 10A output current 

*)   The charging time depends on the duration and load current of the last buffer event. The numbers in the table represent a 

fully discharged battery. A typical figure for a buffer current of 10A is 3h 20Min. for a 7Ah battery. 

**)  The current between the battery and the DC-UPS is more than twice the output current. This is caused by boosting the 12V 

battery voltage to a 24V level.

 

This high current requires large wire gauges and short cable length for the longest possible 

buffer time. The higher the resistance of the connection between the battery and the DC-UPS, the lower the voltage on the 
battery terminals which increases the discharging current. See also chapter 25 for more installation instructions. 

***) To ensure longest battery lifetime, the DC-UPS has a battery deep discharge protection feature included. The DC-UPS stops 

buffering when the voltage on the battery terminals of the DC-UPS falls below a certain value. The yellow LED will show 
“buffer time expired” for a period of 15 minutes after the unit stopped buffering. 

 

Fig. 8-1   Battery discharging current  

Fig. 8-2   Required input current vs. input 

0

0

10

20

5

15

25

30A

2.5

7.5

10

15A

12.5

5

Voltage on
battery terminal
of the DC-UPS:
A:  10.5V
B:  11V
C:  12V

0

23

0.5

1.0

0.25

0.75

1.25

1.5A

24

25

26

28V

max. (battery charging c

urrent 1.7A)

27

typ. (battery charging c

urrent 1.5A)

6/23 

 

 

June. 2010 / Rev. 1.3  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.