The UB20.241 uninterruptible power supply controller (DC-UPS) is used in addition with a 24V power supply and batteries to bridge power failures or voltage fluctuations. This configuration can prevent expensive downtimes, long restart cycles and loss of data.
A unique feature of the UB20 series is the constant voltage in battery mode, which will not change as the batteries discharge. The buffer voltage in battery mode can be set to four different output values. Another feature is the utilization of two independent battery chargers for the two 12V-batteries in series. This feature makes matching batteries unnecessary and allows for precise battery charging, testing and optimized usage of the battery capacity to achieve the longest battery service life.
The UB20.241 includes many battery diagnostic functions that ensure a reliable operation of the entire system. Furthermore, a temperature controlled charging
extends the life of the batteries. It also includes a selectable buffer time limiter as well as ready, buffering and replace battery contacts. For safety and
maintenance, an inhibit input signal is included which prevents a battery backup.
Input voltage from the unit
24 V DC (23.3-30 V DC continuous operation)
Input voltage from the battery
2x12 V DC two batteries in series
Output voltage during normal operation
0.15 V DC lower than the input voltage from the power supply
Output voltage in battery mode
Selectable via switches in the front. 22.5, 24, 25 or 26 VDC.
Output current during normal operation via the unit (max.)
25 A. If feeding unit is greater than 28 A, a 25 A fuse between the unit and the control unit is installed.
Output current in battery mode (max.)
20 A (30 A for 4s, then the output is set in the "hick-up" mode)
Input current internal consumption type
Input current when charging from supply 24 V DC
1.7 A battery switch in position <10 Ah
3.4 A battery switch in position >10 Ah
*The total input power when the battery is charging
1.77 A or 3.47 A
Permitted battery sizes
Charging the battery type
1.5 A battery switch in position <10 Ah
3 A battery switch in position >10 Ah
Ex. 8 hours 12 Ah completely discharged battery
Voltage level of the connection of the battery
Identical to the selected output voltage in battery
Selectable buffer times
10 s, 30 s, 1 m, 3 m, 10 m alt. endlessly until deep discharge protection becomes
Buffer with 2x7 Ah battery **
Min. 13.3 min at 10 A. Typ. 16.53 min at 10 A
Min. 4 min at 20 A. Typ. 5.12 min at 20 A
Buffer with 2x12 Ah battery **
Min. 35.3 min at 10 A. Typ. 44.3 min at 10 A
Min. 11.53 min at 20 A. Typ. 14.51 min at 20 A
PT-1000. See the "Wiring" tab.
Power loss type
3.7 W Supply via power supply, 20 A load current and the battery is fully charged.
22.7 W. Supply via battery, 20 A load current
Operating temperature controller
-40 to +70 °C (some power reduction over +60 °C).
Screw connection. 2.5-4 mm² multifilament, 2.5-6 mm² monofilament
Connection signal contacts
Connector terminals. 0.2-1.5 mm²
Dimensions WxHxD (mm)
46x124x127. (Supplement for signal contacts in height and DIN rail length)
Ready. Controller ready for backup.
Buffering. Control of backup / battery mode.
Repl. Bat. Battery replacement
External shutdown by 24 V DC. Min. pulse time 250ms. Max 35 V DC.
MTBF enl. SN 29500, IEC 61709, 20 A and 40 °C
649 000 hours (Operation with power supply)
CE, UL508 Listed, UL 60950-1, CB-Scheme
EN 61000-6-1, EN 61000-6-2, EN 61000-6-3, EN 61000-6-4.
EN/ IEC 60204-1, EN/IEC 61131-2, EN50178, IEC 62103
* The total input power must be deducted from the unit's rated current, the result is the maximum available load current. Ex. 20 A units is the maximum load current 16.53 A with battery> 10 Ah. 3.47 A is used for internal consumption and charging of the batteries.
** The minimum value of 20% include the aging of the battery and a cable length of 1.5 meters with the area 4 mm² between battery and controller.
Connecting the center tap of the treatment of the batteries separately
For optimized charging and longevity required that each battery is controlled separately. We recommend connecting the midpoint of the batteries with a center drain connection on the controller to achieve maximum performance. Install a 4 A fuse between the battery and the controller.
Connection of a complete DC UPS systems
Install the battery so that it does not get heated by adjacent equipment and ensure that there is proper ventilation according EN50272-2.
DC-UPS module for battery. 24 V DC/20 A
Battery holder for DIN rail. For battery 7 Ah
Battery holder for DIN rail. For 2x12 Ah batteries
DC UPS 24V dc I/P 24V dc 20A O/P 3.9-150Ah
|Input voltage from the unit||24 V DC|
|Input voltage from the battery||24 V DC|
|Input voltage for battery connection||22,8 V DC|
|Input current during charging||3,4 A|
|Output current at 24 V dc||20 A|
|Output voltage for battery operation||22,5|
|Output voltage normal operation||24 V DC|
|Output current for battery operation max||20 A (30 A @ 4 s)|
|Output current during operation max||25 A|
Efficiency / Lifetime / MTBF
|Life span||122 000 h @ 20 A, 40 °C|
|MTBF (IEC 61709)||649 000 h @ 20 A, 40 °C|
|Approvals||ABS, CB, CE, CSA, CSA US, EAC, EX, GL, IECEx, UL|
|Charging the battery type||3 A|
|Ripple max||120 mV pp|
|Voltage level for battery connection||24 V DC|
|Power drop from +60 °C to + 70 °C||12 W/°C|
|Temperature min without derating||-40 °C|
|Temperature max without derating||60 °C|
|Permitted battery sizes||3,9-150 Ah|
|Type Power Supply||DC-UPS|