Reference Manual User Manual

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 noted otherwise.
It is assumed that the input power source can deliver a sufficient output current.
Rockwell Automation Publication 1606-RM013A-EN-P — March 2014 7
Bulletin 1606 Switched Mode Power Supplies
8. Battery Input
The DC-UPS requires one 12V VRLA battery to buer 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 Accessories
section.
Battery voltage range
9.0 – 15.0V Continuously allowed, except deep discharge protection
max. 35Vdc Absolute maximum voltage without any damage to the unit
typ. 7.4V Above this voltage level battery charging is possible
Allowed battery sizes
min. 17Ah
max. 130Ah
Internal battery resistance
max. 100mOhm See individual battry data sheets for this value.
Battery charging method CC-CV Constant current, constant voltage mode
Battery charging current (CC-mode) nom. 3.0A Independent from battery size
max. 3.4A
End-of-charge-voltage (CV-mode)
13.0-14.4V See section 15.
Battery charging time typ. 9h *) For a 26Ah battery
typ. 34h *) For a 100Ah battery
Battery discharging current **)
typ. 21A Buer mode, 10A output
current, 11.5V on the battery
terminal of the DC-UPS, see Fig. 8-1 for other parameters
typ. 0.3A Buer mode, 0A output current
max. 50μA At no input, buering had switched o, all LEDs are o
typ. 270mA At no input, buering had switched o, yellow LED
shows “buer time expired” (max. 15 minutes)
Deep discharge protection ***)
typ. 10.5V At 0A output current
typ. 9.8V At 10A output current
*) The charging time depends on the duration and load current of the last buer event. The numbers in the table represent a
fully discharged 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
buer 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 section 26 for more installation instructions.
***) To ensure longest battery lifetime, the DC-UPS has a battery deep discharge protection feature included. The DC-UPS stops
buering when the voltage on the battery terminals of the DC-UPS falls below a certain value. The yellow LED will show
“buer time expired” for a period of 15 minutes after the unit stopped buering.
Fig. 8-1 Battery discharging current
vs. output current, typ.
Battery Current
0
0
10
20
5
15
25
30A
2.5 7.5 10 5.21A515
O
u
t
p
u
t
C
u
r
r
e
n
t
Voltage on
battery terminal
of the DC-UPS:
A: 10.5V
B: 11V
C: 12V
A B C