UB10.245
DC-UPS, DUAL OUTPUT

U–Series

DC-UPS, DUAL OUTPUT
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PRODUCT DESCRIPTIONSHORT-FORM DATAThe UB10.245 uninterruptible power supply (UPS)
controller along with a standard 24V power supply andone 12V battery can bridge power failures or voltage
fluctuations. This unit can supply and bridge both a 24V
load as well as a 12V load at the same time. The 12V isgenerated by a DC/DC converter from the 24V output.
Therefore, systems that utilize 24V control circuits andrequire 12V for e.g. remote radio telemetry can besupplied with only one UB10.245 DC-UPS controller.
The
DC-UPS
includesaprofessional
battery
management system which charges and monitors thebattery to achieve the longest battery service life as wellas many diagnostic functions that ensure a reliable
operation of the entire system.
24VDC

AC
24V
Power
SupplyDC-UPS
Dual
outpute.g.:
Dimension

UB10.245

24V
Loade.g.: PLC

24V DC-UPS With an Additional 12V Output for
Various Applications
Only One 12V Battery Required
Stable Output Voltage in Buffer Mode
Superior Battery Management for Longest Battery Life
Comprehensive Diagnostic and Monitoring Functions
Replace Battery Signal Included
Electronically Overload and Short Circuit Protected
50% Power Reserves
3 Year Warranty

12V
Load
e.g.: radiotransmitter

Input voltage
Output voltage(normal mode)
Output voltage(buffer mode)
Output current(normal mode)
Output current(buffer mode)
Total output power
Allowed batteries
Temperature range
Derating
Dimensions
Buffer time

12VDC

24Vdc
22.5-30Vdc
0.23V lower as
input voltage
12V
22.25V12V
0 - 15A
0 - 5A0 - 10A
10 – 15A for 5s
0 - 5A
360W
240W

NominalInput range
Typ., 24V output

3.9Ah to 40Ah
-25 to +70°C
6W/°C
49x124x117mm
typ. 6’30”

VRLA lead acid
Operational+50 to +70°C
WxHxD
7Ah battery module
24V 7A, 12V 5A
26Ah module
24V 7A, 12V 5A

typ. 54’

12V Battery

ORDER NUMBERS

12V output
24V output at 10A
12V output at 5A
24V output
12V output
24V output
24V output
12V output
Normal mode
Buffer mode

MAIN APPROVALS

DC-UPS

UB10.245

Standard controller

Accessory

UZK12.072

Battery module 12V 7Ah

UZO12.072

Mounting kit w/o battery

UZK12.261

Battery module 12V 26Ah

UZO12.26

Mounting kit w/o battery

ZM10.WALL

Panel/Wall mount bracket

For details and the complete approval list, see chapter 19

UL 508

UL 60950-1

ATEX

IECEx

Class I Div 2Class I Div 2

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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UB10.245
DC-UPS, DUAL OUTPUT

U–Series

INDEX

PAGE

1. Intended Use .......................................................3
2. Installation Instructions ......................................3
3. Input ....................................................................5
4. Output in Normal Mode .....................................6
5. Output in Buffer Mode .......................................7
6. Battery Input .......................................................9
7. Buffer Time ........................................................10
8. Efficiency and Power Losses..............................12
9. Functional Diagram ...........................................12
10. Check Wiring and Battery Quality Tests...........13
11. Relay Contacts and Inhibit Input ......................14
12. Front Side User Elements ..................................15
13. Terminals and Wiring ........................................16
14. Reliability ...........................................................17
15. EMC ....................................................................18
16. Environment ......................................................19

INDEX

PAGE

17. Protection Features .......................................... 19
18. Safety Features ................................................. 20
19. Approved, Fulfilled or Tested Standards ......... 21
20. Regulatory Product Compliance ...................... 22
21. Used Substances ............................................... 23
22. Physical Dimensions and Weight ..................... 23
23. Installation Notes ............................................. 24
24. Accessories ........................................................ 25
24.1. Battery modules………………………….25
24.2. ZM10.WALL - Wall mounting bracket..26
25. Application Notes ............................................. 27
25.1. Battery Replacement Intervals…………27
25.2. Parallel and Serial Use……...…………. .28
25.3. Using the Inhibit Input………………….29
25.4. Troubleshooting……………………........29

INTENDED USE
The unit shall only be installed and put into operation by qualified personnel.
This unit is designed for installation in an enclosure and is intended for general use, such as in industrial control,
office, communication, and instrumentation equipment. Do not use this device in aircraft, trains and nuclear
equipment, where malfunctioning of the power supply may cause severe personal injury or threaten human life.

TERMINOLOGY AND ABREVIATIONS
DC-UPS

Uninterruptible power supply with DC-Input.

Normal mode

Describes a condition where the battery is charged, the input voltage is in range and the output isloaded within the allowed limits.

Buffer mode

Describes a condition where the input voltage is below the transfer threshold level, the unit isrunning on battery (buffering) and the output is loaded within the allowed limits.

Charging mode

Describes a condition where the battery is being charged, the input voltage is in range and theoutput is loaded within the allowed limits.

Inhibit mode
Buffer time

Describes a condition where buffering is disabled on purpose by using the inhibit input of the DCUPS. (e.g. for service actions, or to save battery capacity)
Same as the term “hold-up time”.

t.b.d.

To be defined, value or description will follow later.

DISCLAIMER
The information presented in this document is believed to be accurate and reliable and may change without notice.
Some parts of this unit are patent by PULS (US patent No 091662,063, Des. 424,529, …).
No part of this document may be reproduced or utilized in any form without permission in writing from the publisher.

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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UB10.245
DC-UPS, DUAL OUTPUT

U–Series

1. INTENDED USEThis device is designed for installation in an enclosure and is intended for commercial use, such as in industrial
control, process control, monitoring and measurement equipment or the like.
Do not use this device in equipment where malfunction may cause severe personal injury or threaten human life.

2. INSTALLATION INSTRUCTIONS
Risk of electrical shock, fire, personal injury or death.
- Turn power off before working on the device and protect against inadvertent re-powering.
- Do not open, modify or repair the device.
- Use caution to prevent any foreign objects from entering into the housing.
- Do not use in wet locations or in areas where moisture or condensation can be expected.
- Do not touch during power-on, and immediately after power-off. Hot surface may cause burns.
Obey the following installation instructions:This device may only be installed and put into operation by qualified personnel.
This device does not contain serviceable parts. The tripping of an internal fuse is caused by an internal defect.
If damage or malfunction should occur during installation or operation, immediately turn power off and send unit to
the factory for inspection.
Turn power off and disconnect the battery fuse before working on the device.
Install the device in an enclosure providing protection against electrical, mechanical and fire hazards.
Install the device onto a DIN rail according to EN 60715 with the input terminals on the top of the unit.
The input can be powered from a regulated power supply or a similar DC source. The voltage between the input andground must not exceed 60Vdc continuously. The ripple voltage in the low frequency range between 50Hz and 10kHz
must be negligible when used in marine applications.
The input must be powered from a PELV or SELV source or an “Isolated Secondary Circuit” in order to maintain a SELVor PELV output.
Use an appropriately sized 24V power supply, which can deliver the additional internal current consumption, required
to charge the battery.
Use only VRLA lead acid batteries with a capacity between 3.9Ah and 40Ah.
Check for correct input and battery polarity. The device will not operate when the voltage is reversed.
Make sure that the wiring is correct by following all local and national codes. Use appropriate copper cables that aredesigned for a minimum operating temperature of 60°C for ambient temperatures up to +45°C, 75°C for ambient
temperatures up to +60°C and 90°C for ambient temperatures up to +70°C. Ensure that all strands of a stranded wire
enter the terminal connection.
Do not use wires smaller than 2.5mm2 (or AWG 12) and not longer than 2x1.5m between the battery and the DC-UPS
controller. Longer or smaller gauge wires can change performance of the system. Use a 30A fuse (ATOF® 287 030 fromLittle fuse or an UL listed fuse with the same characteristics) in the battery circuit. The battery fuse protects the wires
between the battery and the DC-UPS and shall be located close to the battery.
The device is designed for pollution degree 2 areas in controlled environments. No condensation or frost is allowed.
The device is designed as “Class of Protection III” equipment according to IEC 61140.
The enclosure of the device provides a degree of protection of IP20.
A disconnecting means shall be provided for the input and the battery input of the device.
The device is designed for convection cooling and does not require an external fan. Do not obstruct airflow and do notcover ventilation grid!
Keep the following minimum installation clearances: 40mm on top, 20mm on the bottom, 5mm left and right side.
Increase the 5mm to 15mm in case the adjacent device is a heat source. When the device is permanently loaded withless than 50%, the 5mm can be reduced to zero.
Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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UB10.245
DC-UPS, DUAL OUTPUT

U–Series

The device is designed for altitudes up to 6000m (19685ft).
The maximum surrounding air temperature is +70°C (+158°F). The operational temperature is the same as the ambientor surrounding air temperature and is defined 2cm below the device.
The device is designed to operate in areas between 5% and 95% relative humidity.
Installation Instructions for Hazardous Location Areas
The device is suitable for use in Class I Division 2 Groups A, B, C, D locations and for use in Group II Category 3 (Zone2) environments.
Hazardous Location Classification: ATEX: EPS 15 ATEX 1 025 X, II 3G EX ec nC IIC T3 Gc
WARNING EXPLOSION HAZARDS!
Substitution of components may impair suitability for this environment.
Do not disconnect the device or change unit settings unless power has been switched off or the area is known to be
non-hazardous.
A suitable enclosure must be provided for the end-product which has a minimum protection of IP54 and fulfils therequirements of the EN 60079-0.

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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UB10.245
DC-UPS, DUAL OUTPUT

U–Series

3. INPUT
Input voltage
Input voltage ranges

nom.
nom.

DC 24V
22.5-30Vdc
30-35Vdc
35Vdc
0-22.5Vdc

Allowed input voltage ripplemax.

Allowed voltage between input
and earth (ground)Turn-on voltage

max.
typ.
max.

1.5Vpp1Vpp
60Vdc or
42.4Vac
22.8Vdc
23Vdc

Input current**)

typ.
typ.

140mA
1.1A

External capacitors on the input*)

Continuous operation, see Fig. 3-1
Temporarily allowed, no damage to the DC-UPS*)
Absolute maximum input voltage with no damage to the
DC-UPSThe DC-UPS switches into buffer mode and delivers
output voltage from the battery if the input was above
the turn-on level before and all other buffer conditions
are fulfilled.
Bandwidth <400Hz
Bandwidth 400Hz to 1kHz

The output does not switch on if the input voltage does
not exceed this level.
Internal current consumption
Current consumption for battery charging in constantcurrent mode at 24V input See Fig. 6-2***)

No limitation

The DC-UPS shows “Check Wiring” with the red LED and buffering is not possible**) The total input current is the sum of the output current, the current which is required to charge the battery during thecharging process and the current which is needed to supply the DC-UPS itself. See also Fig. 3-2. This calculation does not apply
in overload situations where the DC-UPS limits the output current, therefore see Fig. 3-3.
***) Please note: This is the input current and not the current which flows into the battery during charging. The battery current canbe found in chapter 8.
Fig. 3-1 Input voltage range

VOUT

D

A

B

Fig. 3-2 Input current, definitions

C

Input
Current

OutputCurrent

VIN
0

18

22.5

30

35V

A: Rated input voltage range
B: Temp. allowed, no harm to the unit
C: Absolute max. input voltage
D: Buffer mode

Electronic output current limitation
The DC-UPS is equipped with an electronic output
current limitation. This current limitation works in aswitching mode which reduces the power losses andheat generation to a minimum. As a result, theoutput voltage drops since there is not enoughcurrent to support the load. A positive effect of thecurrent limitation in switching mode is that the input
current goes down despite an increase in the output
current resulting in less stress for the supplying
source. Fig. 3-3 shows the behavior when the 12V is
not loaded. Power which is taken out from the 12V
reduces the power on the 24V side.

Internal
current
consumption

Current
consumption
for battery
charging

Fig. 3-3 Input current vs. 24V output current,
typ. (battery fully charged)

Overload

Output Voltage

20V
10
20A
15
10

In

5
0

t
pu

Cur

ren

t

Output Current

0

4

8

12

15

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

20A

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UB10.245
DC-UPS, DUAL OUTPUT

U–Series

4. OUTPUT IN NORMAL MODE
The total output power of 360W can be shifted dynamically between the two outputs.
24V Output:
Output voltagenom.

The output voltage follows the input voltage reduced by the
input to output voltage drop.
At 10A output current, see Fig. 4-1 for typical values
At 15A output current, see Fig. 4-1 for typical values
20Hz to 20MHz, 50Ohm *)Continuously allowed, lower if the 12V output is loaded.
Output if 12V output is loaded with 5A.
Load impedance 100mOhm, see Fig. 4-2 for typical values. The
12V output is off during an overload or short on the 24V.

Voltage drop between input and max.
outputmax.
Ripple and noise voltage
max.
Output current
nom.
min.
Short-circuit current
min.
max.
Capacitive and inductive loads

0.3V
0.45V
20mVpp
0–15A
12.3A
17.9A
21A
No limitation

12V Output:
Output voltage
Output voltage tolerance
Ripple and noise voltage
Output current

DC 12V±2%
30mVpp0 - 5A

Short-circuit current

nom.
typ.
nom.
min.
max.

Capacitive and inductive loads*)

DC 24V

20Hz to 20MHz, 50Ohm*)
Continuously allowed, may be lower if the 24V output is loaded
more than 12.3A

4A
Load impedance 100mOhm, see Fig. 5-5. for typical values. The
24V output is on during an overload or short on the 12V.
5.5A
No limitation

This figure shows the ripple and noise voltage which is generated by the DC-UPS. The ripple and noise voltage might be higher if
the supplying source has a higher ripple and noise voltage.
Fig. 4-1

Input to output voltage drop, typ.

Input to Output
Voltage drop

Fig. 4-2

Output voltage vs. output current innormal mode at 24V input, typ.

Output Voltage

28V

0.4V
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0

24
20
16
12
8
Output Current

0

2

4

6

8 10 12 14 16 18A

40

Output Current

0

5

10

15

20

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

25A

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UB10.245
DC-UPS, DUAL OUTPUT

U–Series

5. OUTPUT IN BUFFER MODE
If the input voltage falls below the transfer threshold level, the DC-UPS starts buffering without any interruption or
voltage dips. The transfer threshold level is typically 80mV higher than the 24V output voltage in buffer mode.
Buffering is possible even if the battery is not fully charged.
24V Output
Output voltagenom.

Ripple and noise voltage
Output current

max.
nom.

Short-circuit current

min.
min.
max.

12V Output
Output voltage
Output voltage tolerance
Ripple and noise voltage
Output current
Short-circuit current*)**)

DC 24V
22.45V22.25V
20mVpp0-10A10-15A
7.0A
17.9A
21A

Output is stabilized and independent from battery voltage±1%, at no load,±1%, at 10A output current
20Hz to 20MHz, 50Ohm
Continuously allowed, 12V output not loaded.
*)
12V output not loaded.
If 12V output is loaded with 5A.
Load impedance 100mOhm**); The 12V output is off during an
overload or short on the 24V.

Output is stabilized and independent from battery voltage

typ.
nom.

DC 12V±2%
30mVpp
0-5A

min.
max.

4A
5.5A

nom.

20Hz to 20MHz, 50Ohm ;Continuously allowed, may be lower if the 24V output is loaded
more than 7.0A
Load impedance 100mOhm, see Fig. 5-5 for typical values.
Continuous constant; The 24V output is on during an overload
or short on the 12V as long as the battery delivers current.

If the output current is in the range between 10A and 15A (Bonus Power) for longer than 5s, a hardware controlled
reduction of the maximal output current to 10A occurs. If the 10A are not sufficient to maintain the 24V, buffering stops at
both outputs after another 5s. The buffering is possible again as soon as the input voltage recovers.
If the nominal output voltage cannot be maintained in buffer mode, the DC-UPS switches off after 5s to save battery
capacity.
Fig. 5-1 Buffering transition, definitions

Input
voltage

28V
24V

Fig. 5-2 Transfer behavior, typ.

Transferthresholdt
Outputvoltage
Buffer modetAug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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UB10.245
DC-UPS, DUAL OUTPUT

U–Series

Fig. 5-3 Available output current in buffer mode

Fig. 5-4 24V Output voltage vs. output current in
buffer mode, typ.
Output Voltage

OutputCurrent

25V

15A

BonusPower

B

A

20
®

15

D

10

10A

C

5
0

5A
Time

0
0

5 Sec.

A
B
C
D

OutputCurrent

10

5

0

15

25A

20

Continuously available
Available for 5s then auto switching to curve D
Buffering will stop after 5s
Buffering will stop after 5s

Fig. 5-5 12V Output voltage vs. output current innormal or buffer mode, typ.
Output Voltage

14V
12
10
8
6
4
2
0

Output Current

0

1

2

3

4

5

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

6

A

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UB10.245
DC-UPS, DUAL OUTPUT

U–Series

6. BATTERY INPUTThe DC-UPS requires one 12V VRLA battery to buffer the 24V and 12V output.
Battery voltage

nom.

Battery voltage range

typ.
typ.
typ.

9.0–15.0V
35Vdc
7.4V
3.9Ah
40Ah
100mOhm
CC-CV
1.5A
1.7A
13.4-13.9V
5h*)
17h*)
21A

typ.
max.
typ.

0.3A
50µA
310mA

typ.
typ.

10.5V
9.0V

max.
typ.
min.
max.
max.

Allowed battery sizes
Internal battery resistanceBattery charging method
Battery charging current (CC-mode)

nom.
max.

End-of-charge-voltage (CV-mode)
Battery charging time
Battery discharging current**)

Deep discharge protection***)

DC 12VUse one maintenance-free 12V VRLA lead acid battery or
one battery module which is listed in the chapter
accessories.
Continuously allowed, except deep discharge protection
Absolute maximum voltage with no damage to the unit
Above this voltage level battery charging is possible

See individual battery datasheets for this value
Constant current, constant voltage mode
Independent from battery size,
Corresponding 24V input current see Fig. 6-2
Adjustable, see chapter 12
For a 7Ah battery
For a 26Ah battery
Buffer mode, 240W output, 11.5V on the battery
terminal of the DC-UPS, see Fig. 6-1 for other parameters
Buffer mode, 0A output current
At no input, buffering had switched off, all LEDs are off
At no input, buffering had switched off, yellow LED
shows “buffer time expired” (max. 15 minutes)
At 0% output load
At 100% output load*)

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 at 24V output is 3h 20Min. for a 7Ah battery.
**) The current between the battery and the DC-UPS is more than twice the 24V 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 thebattery terminals which increases the discharging current. See also chapter 23 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.
Fig. 6-1 Battery discharging current
vs. 24V output current, typ.
(12V not loaded)
Battery Current

A

30A

B

Fig. 6-2 Required input current vs. input
voltage for battery charging(12V not loaded)
C

25

Input Current

1.5A
1.25

20

Voltage on
battery terminalof the DC-UPS:
A: 10.5V
B: 11V
C: 12V15
105Output Current

0
0

2.5

5

7.5

10

1.0

max. (battery

charging curre
nt 1.7A)
typ. (battery
charging curre
nt 1.5A)

0.75
0.5
0.25

Input Voltage

012.5 15A

23

24

25

26

27

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

28V

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UB10.245
DC-UPS, DUAL OUTPUT

U–Series

7. BUFFER TIME
The buffer time depends on the capacity and performance of the battery as well as the load current. The diagram
below shows the typical buffer times of the 24V output with the standard battery modules at 20°C.
Buffer time with battery module UZK12.072

Buffer time with battery module UZK12.261

*)

min.
min.
typ.
typ.
min.
min.
typ.
typ.

18’30’’
5’30’’
20’50’’
6’30’’
96’30’’
37’50”
126’
53’20”At 5A output current *)At 10A output current *)At 5A output current, see Fig. 7-1 **)At 10A output current, see Fig. 7-1 **)At 5A output current *)At 10A output current *)At 5A output current, see Fig. 7-1 **)At 10A output current, see Fig. 7-1 **)Minimum value includes 20% aging of the battery and a cable length of 1.5m with a cross section of 2.5mm2 between thebattery and the DC-UPS and requires a fully charged (min. 24h) battery.

**) Typical value includes 10% aging of the battery and a cable length of 0.3m with a cross section of 2.5mm2 between the battery
and the DC-UPS and requires a fully charged (min. 24h) battery.
Fig. 7-1 Buffer time vs. 24V output current with the battery modules UZK12.072 and UZK12.261
Buffer Current

10A

UZK

8

12.2
61 t

12V
2

6

6Ah
b

yp.

atter
y

4

UZK12.261

UZK12.071 typ.

2
Buffer Time (Minutes)

12V 7Ah battery

5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 90

typ.

UZK12.071 typ.

120 150 180 210 240 270 300
Min.

The buffer time is reduced if the 12V output is loaded. This can be calculated according to the following
example:Example: 24V, 5A and 12V, 4A load
Step1: Convert the 12V current to a virtual 22.3V level:
Ratio: 12V/22.3V= 0.54

12V, 4A output converted to 22.3V level: 0.54*4A=2.15A

Step 2: Add the computed current to the actual 24V current:
2.15A+ 5A = 7.15A
Step 3: Determine the buffer time by using the standard buffer time curve (Fig. 7-1):
7.15A load with UZK12.072: Approx. 12 minutes buffer time.
The battery capacity is usually specified in amp-hours (Ah) for a 20h discharging event. The battery discharge is nonlinear (due to the battery chemistry). The higher the discharging current, the lower the appropriable battery capacity.
The magnitude of the reduction depends on the discharging current as well as on the type of battery. High current
battery types can have up to 50% longer buffer times compared to regular batteries when batteries will bedischarged in less than 1 hour. High discharging currents do not necessarily mean high power losses as theappropriable battery capacity is reduced with such currents. When the battery begins to recharge after a discharging
Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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UB10.245
DC-UPS, DUAL OUTPUT

U–Series

event, the process is completed much faster since only the energy which was taken out of the battery needs to be“refilled”. For this reason, the buffer time cannot be calculated using the Ah capacity value.
The equation “I x t” = capacity in Ah generally leads to incorrect results when the discharging current is higher thanC20 (discharging current for 20h). The battery datasheet needs to be studied and a determination of the expectedbuffer time can be made according to the following example:

Example how to determine the expected buffer time for other battery types and battery sizes:
Step 1

Check the datasheet of the battery which is planned to be used and look for the discharging curve.
Sometimes, the individual discharging curves are marked with relative C-factors instead of current
values. This can easily be converted. The C-factor needs to be multiplied with the nominal battery
capacity to get the current value. E.g.: 0.6C on a 17Ah battery means 10.2A.
Fig. 7-2 Typical discharging curve of a typical 17Ah battery, curve taken from amanufacturer’s datasheet

Step 2

Determine the required battery current. Use Fig. 6-1 “Battery discharging current vs. output current” to
get the battery current. Fig. 6-1 requires the average voltage on the battery terminals. Since there is a
voltage drop between the battery terminals and the battery input of the DC-UPS, it is recommended touse the curve A or B for output currents > 3A or when long battery cables are used. For all othersituations, use curve C.

Step 3

Use the determined current from Step 2 to find the appropriate curve in Fig. 7-2. The buffer time
(Discharging Time) can be found where this curve meets the dotted line. This is the point where the DCUPS stops buffering due to the under-voltage lockout.

Step 4

Depending on Fig. 7-2, the buffer time needs to be reduced to take aging effects or guaranteed values
into account.

Example:The buffer current is 24V 7.5A and a battery according Fig. 7-2 is used. The cable between the battery and the DC-UPS
is 1m and has a cross section of 2.5mm2. How much is the maximum achievable buffer time.
Answer:

According to Fig. 6-1, the battery current is 18A. Curve A is used since the battery current is > 3A and thelength of the cable is one meter.



According to Fig. 7-2, a buffer time (Discharging Time) of 30 Minutes can be determined. It is recommended
to reduce this figure to approximately 24 minutes for a guaranteed value and to cover aging effects.

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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8. EFFICIENCY AND POWER LOSSES
Efficiency

typ.
typ.
typ.
typ.
typ.
typ.
typ.
typ.

Power losses

97.5%
96%
3.4W
6W
10W
5.5W
19W
23W

Normal mode, 24V 10A, 12V 0A, battery fully charged
Normal mode, 24V 7.0A, 12V 5A, battery fully charged
Normal mode, no load, battery fully charged
Normal mode, 24V 10A, 12V 0A, battery fully charged
Normal mode, 24V 12.3A, 12V 5A, battery fully charged
During battery charging, no load.
Buffer mode, 24V 10A, 12V 0A
Buffer mode, 24V 7.0A, 12V 5A

9. FUNCTIONAL DIAGRAM
Fig. 9-1 Functional diagram

DC-UPS Control Unit
+

24V
Power
SupplyInput-

Input Fuse&
ReversePolarity
Protection*

12V Battery

+

-

-

Buffered
Load-

Step-down
Converter

12V Output

Buffered
Load-

Battery
Charger

Status LED (green)
Diagnosis LED (yellow)+
Battery

24V Output+
Step-upConverter

Battery
Tester+Electronic
Current
Limiter

Controller

Cut-off
Relay

Check Wiring LED (red)Buffer-time Limiter

10s, 30s, 1m, 3m, 10m,

End-of-charge Voltage(7) Inhibit +(8) Inhibit (1)(2) (3)(4) (5)(6)

Ready Buffering Replace
Contact Contact Battery
Contact*)

Return current protection; This feature utilizes a Mosfet instead of a diode in order to minimize the voltage drop and power
losses.

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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DC-UPS, DUAL OUTPUT

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10. CHECK WIRING AND BATTERY QUALITY TESTSThe DC-UPS is equipped with an automatic “Check Wiring” and “Battery Quality” test.
“Check Wiring” test:
Under normal circumstances, an incorrect or bad connection from the battery to the DC-UPS or a missing (or blown)
battery fuse would not be recognized by the UPS when operating in normal mode. Only when back up is required
would the unit not be able to buffer. Therefore, a “check wiring” test is included in the DC-UPS. This connection istested every 10 seconds by loading the battery and analyzing the response from the battery. If the resistance is too
high, or the battery voltage is not in range, the unit displays “Check Wiring” with the red LED. At the same time thegreen “Ready” LED will turn off.
“Battery Quality” or “State of Health” (SoH) test:
The battery has a limited service life and needs to be replaced in a fixed interval which is defined by the specified
service life (acc. to the Eurobat guideline), based on the surrounding temperature and the number ofcharging/discharging cycles. If the battery is used longer than the specified service life, the battery capacity will
degrade. Details can be found in chapter 25.1. The battery quality test can not determine a gradual loss in capacity.
However, it can detect a battery failure within the specified service life of the battery. Therefore a battery quality test
is included in the DC-UPS.
The battery quality test consists of different types of tests:

During charging:
If the battery does not reach the ready status (see chapter 12) within 30h, it is considered to be defective.
The reason could be a broken cell inside the battery.
During operation:
Once the battery is fully charged, a voltage drop test and a load test is performed alternately every 8 hours.
Three of the tests must consecutively produce negative results to indicate a battery problem.

A battery problem is indicated with the yellow LED (replace battery pattern) and the relay contact “Replace Battery”.
Please note that it can take up to 50 hours (with the largest size of battery) until a battery problem is reported. Thisshould avoid nuisance error messages as any urgent battery problems will be reported by the “Check Wiring” test
and create a warning signal. The battery tests require up to 50h uninterrupted operation. Any interruptions in thenormal operation of the DC-UPS may result in the “Replace Battery” test cycle to start over.
When “Replace battery” is indicated, it is recommended to replace battery as soon as possible.

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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DC-UPS, DUAL OUTPUT

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11. RELAY CONTACTS AND INHIBIT INPUTThe DC-UPS is equipped with relay contacts and signal inputs for remote monitoring and controlling of the unit.
Relay contacts:
Ready:

Contact is closed when battery is charged more than 85%, no wiring failure are recognized, input
voltage is sufficient and inhibit signal is not active.

Buffering:Contact is closed when unit is buffering.

Replace Battery:Contact is closed when the unit is powered from the input and the battery quality test (SOH test)
reports a negative result.

Relay contact ratings
Isolation voltage

max.
min.
max.

60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A resistive load
1mA at 5Vdc min.
500Vac, signal port to power port

Signal input:
Inhibit:

Signal voltage
Signal current
Inhibit threshold
Isolation

The inhibit input disables buffering. In normal mode, a static signal isrequired. In buffer mode, a pulse with a minimum length of 250ms isrequired to stop buffering. The inhibit is stored and can be reset bycycling the input voltage. See also chapter 25.1 for application hints.
max.
max.
min.
max.
nom.

7+
3mA

Inhibit
8-

5,1V

35Vdc
6mA, current limited
6Vdc, buffering is disabled above this threshold level
10Vdc
500Vac, signal port to power port

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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DC-UPS, DUAL OUTPUT

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12. FRONT SIDE USER ELEMENTS
A

Power Port
Quick-connect spring-clamp terminals, connection for input voltage,
output voltage and battery. The 12V power port is placed on the bottom.

B

Signal Port
Plug connector with screw terminals, inserted from the bottom.
Connections for the Ready, Buffering, Replace Battery relay contacts andfor the Inhibit input. See details in chapter 11.

C

Green Status LED
Ready: Battery is charged > 85%, no wiring failure is recognized, input
voltage is sufficient and inhibit signal is not active.
Charging: Battery is charging and the battery capacity is below 85%.
Buffering: Unit is in buffer mode.
Flashing pattern of the green status LED:

D

ON
OFF

Ready

ON
OFF

Charging

ON
OFF

Buffering

Yellow Diagnosis LED
Overload: Output has switched off due to long overload in buffer modeor due to high temperatures.
Replace battery: Indicates a battery which failed the battery quality test
(SoH test). Battery should be replaced soon.
Buffer-time expired: Output has switched off due to settings of Buffertimer Limiter. This signal will be displayed for 15 minutes.
Inhibit active: Indicates that buffering is disabled due to an active inhibit
signal.
Flashing pattern of the yellow diagnosis LED:
ON
OFF

Overload

ON
OFF

Replace
BatteryON
OFF

Buffer time
expired

ON
OFF

InhibitactiveE

Red Check Wiring LED
This LED indicates a failure in the installation (e.g. too low input voltage), wiring, battery or battery fuse.

F

Buffer-time Limiter:
User accessible dial which limits the maximum buffer time in a buffer event to save battery energy. When thebattery begins to recharge after a discharging event, the process is completed much faster since only the energy
which was taken out of the battery needs to be “refilled”. The following times can be selected: 10 seconds, 30
seconds, 1 minute, 3 minutes, 10 minutes or infinity (until battery is flat) which allows buffering until the deep
discharge protection stops buffering.

G End-of-charge-voltage Selector:
The end-of-charge-voltage shall be set manually according to the expected temperature in which the battery is
located. The dial on the front of the unit allows an continuously adjustment between +10 and +40°C. 10°C will set
the end-of-charge-voltage to 13.9V, 25°C13.65V and 40°C13.4V. If in doubt about the expected temperature,
set the unit to 40°C.
Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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13. TERMINALS AND WIRINGType

Solid wire
Stranded wire
AWG
FerrulesPull-out force
Recom. screwdriver
Tightening torque
Wire stripping length

Power terminals(except 12V)
Bi-stable, quick-connect
spring-clamp terminals.
Shipped in open position.

12V Terminal

Signal terminals

Lockable plug connector
with spring-clamp
terminals.

Plug connector with screw
terminal. Shipped in open
position. To meet GL
requirements, unused terminal
compartments should be closed.
0.2-1.5mm2
0.2-1.5mm2
22-14AWG
Allowed, but not required
Not applicable

0.5-6mm2
0.1-2.5mm2
2
0.5-4mm0.1-2.5mm2
20-10AWG
28-12AWG
Allowed, but not required
Allowed, but not required
10AWG:80N, 12AWG:60N, 14AWG:50N, 16AWG:40N
according to UL486E
Not required
3,5mm slotted
Not applicableNot applicable
10mm / 0.4inch
8.5mm / 0.34inch

3,5mm slotted
0.4Nm, 3.5lb.in
6mm / 0.24inch

Fig. 13-1 Spring-clamp terminals, connecting a wire

Instructions:a)

Use appropriate copper cables, that are designed
for an operating temperature of 60°Cb)

Follow national installation codes and regulations!

c)Ensure that all strands of a stranded wire enter theterminal connection!

d)

Up to two stranded wires with the same crosssection are permitted in one connection point

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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DC-UPS, DUAL OUTPUT

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14. RELIABILITY
Lifetime expectancy, normal mode

MTBF SN 29500, IEC 61709, normal mode
MTBF MIL HDBK 217F, normal mode

min.
min.
min.

114 000 h
148 000 h
380 000 h
788 000 h
343 000 h

At 10A output current, 40°C
At 5A output current, 40°C
At 10A output current, 25°C
At 10A output current, 40°C
At 10A output current , 40°C, ground benign GB40

The Lifetime expectancy shown in the table indicates the operating hours (service life) and is determined by the
lifetime expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours.
Lifetime expectancy is calculated according to the capacitor’s manufacturer specification. The prediction model allows
a calculation of up to 15 years from date of shipment.
MTBF stands for Mean Time Between Failure, which is calculated according to statistical device failures and indicatesreliability of a device. It is the statistical representation of the likelihood of a unit to fail and does not necessarily
represent the life of a product.

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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DC-UPS, DUAL OUTPUT

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15. EMCThe unit is suitable for applications in industrial environment as well as in residential, commercial and light industry
environment without any restrictions. CE mark is in conformance with EMC directive 89/336/EC and 93/68/EC and2004/108/EC and the low-voltage directive (LVD) 73/23/EC, 93/68/EC, 2006/95/EC.
A detailed EMC Report is available on request.
EMC Immunity
Electrostatic discharge

EN 61000-6-1, EN 61000-6-2
EN 61000-4-2

Electromagnetic RF field
Fast transients (Burst)

EN 61000-4-3
EN 61000-4-4

Surge voltage

EN 61000-4-5

Conducted disturbanceEN 61000-4-6

Contact discharge
Air discharge
80MHz-1GHz
Out- and input lines
Signal lines**)
Input + / -  housing
24V Output +  housing
12V Output + / - housing
24V Output +  Input +  0,15-80MHz

Generic standards
8kV
Criterion A*)
15kV
Criterion A*)
10V/m
Criterion A
2kV
Criterion A
2kV
Criterion A
500V
Criterion A
500V

Criterion A

500V

Criterion A

500V
500V
10V

Criterion A
Criterion A
Criterion A*) DIN rail earthed**) Tested with coupling clamp

EMC Emission
Conducted emission

EN 61000-6-3, EN 61000-6-4
Generic standards
EN 55032
Input lines
Class B*)EN 55032
24V Output lines
Class B*)EN 55032
12V Output lines
Class A*)
Radiated emission
EN 55011, EN 55032
Class B
This device complies with FCC Part 15 rules.
Operation is subjected to the following two conditions: (1) this device may not cause harmful interference, and (2) thisdevice must accept any interference received, including interference that may cause undesired operation.
*)

Informative measurement with voltage probe

Switching frequencies
Switching frequency of boost converter
Switching frequency of electronic output current limitation
Switching frequency of battery charger
Switching frequency of step-down converter 12V output

The DC-UPS has four converters with four different
switching frequencies included.
100kHzConstant frequency
78kHz
Constant frequency
19.5kHz
Constant frequency
40-55kHz
Depending on 12V output load

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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DC-UPS, DUAL OUTPUT

U–Series

16. ENVIRONMENT
Operational temperature-25°C to +70°C (-13°F to 158°F)

For the DC-UPS control unit.
Keep battery in a cooler environment!
at +50°C to +70°C (122°F to 158°F),
normal mode see Fig. 16-1,
buffer mode see Fig. 16-2

Derating

6W/°C

Storage temperature-40 to +85°C (-40°F to 185°F)

Humidity

5 to 95% r.H.

Vibration sinusoidal
Shock
Altitude2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g
30g 6ms, 20g 11ms
0 to 6000m

Over-voltage category

II
II

EN 50178
EN 50178 above 2000m altitude

Degree of pollution

2

EN 50178, not conductive

Storage and transportation, except battery
IEC 60068-2-30
Do not energize while condensation is present
IEC 60068-2-6
IEC 60068-2-27
Approvals apply only up to 2000m

Fig. 16-1 Output current vs. ambient temperature
in normal mode

Fig. 16-2 Output current vs. ambient temperaturein buffer mode

Allowable Output
Power in Normal Mode

Allowable Output
Power in Buffer Mode

360W

360W

300

300

240

240

180

180

120

120

60
0
-25

60

Ambient Temperature

020

50 60 70°C

0-25

for typ. 5s

continuous

Ambient Temperature

020

50 60 70°C

The ambient temperature is defined 2cm below the unit.

17. PROTECTION FEATURES
Output protection
Output over-voltage protection

Degree of protection
Penetration protection
Reverse battery polarity protection
Wrong battery voltage protection
Battery deep discharge protection
Over temperature protection
Input over-voltage protection
Internal input fuse

Electronically protected against overload, no-load and short-circuits
typ. 32Vdc
24V Output
In case of an internal defect, a redundant circuitry limits themax. 35Vdc
maximum output voltage. The output automatically shutsdown and makes restart attempts
max. 16V
12V Output: The unit is protected with a melting fuse. Incase the fuse has triggered, send unit back to factory.
IP20
EN/IEC 60529> 3.5mm
E.g. screws, small partsyesMax. –35Vdc;
yesMax. +35Vdc (e.g. 24V battery instead of 12V battery)yes
The limit is battery current dependentyes
Output shut-down with automatic restartyesMax. 35Vdc, no harm or defect of the unit
25A, blade type
No user accessible part, no service partAug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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DC-UPS, DUAL OUTPUT

U–Series

18. SAFETY FEATURES
Output voltage

Class of protection
Isolation resistanceDielectric strength
Touch current (leakage current)

SELV
IEC/EN 60950-1
PELV
EN 60204-1, EN 50178, IEC 60364-4-41
Max. allowed voltage between any input, output or signal pin and ground:
60Vdc or 42.4Vac
III
PE (Protective Earth) connection is not required> 5MOhm
Power port to housing, 500Vdc
500VacPower port to signal port
500VacPower port / signal port to housing
The leakage current which is produced by the DC-UPS itself depends on the input
voltage ripple and need to be investigated in the final application.
For a smooth DC input voltage, the produced leakage current is less than 100µA.

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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DC-UPS, DUAL OUTPUT

U–Series

19. APPROVED, FULFILLED OR TESTED STANDARDSUL 508UL Certificate
Listed equipment for category NMTR - Industrial Control
Equipment
Applicable for US and Canada
E-File: E198865

IEC 60950-1

CB Scheme Certificate
General safety requirements for Information Technology
Equipment (ITE)UL 60950-1

UL Certificate
Recognized component for category QQGQ - Information
Technology Equipment (ITE)
Applicable for US and Canada
E-File: E137006

ATEX

Agency Certificate (Bureau Veritas)
EN 60079-0 Explosive atmospheres - General requirements
EN 60079-7, EN 60079-15 Equipment protection by type ofprotection "e" and "n"Certificate: EPS 15 ATEX 1 025 X
Temperature Code: T3
Type of Protection: ec nC

IECEx

IECEx Certificate
IEC 60079-0 Explosive atmospheres - General requirements
IEC 60079-7, IEC 60079-15 Equipment protection by type ofprotection "e" and "n"Certificate: IECEx EPS 15.0049 X
Temperature Code: T3
Type of Protection: ec nC

Class I Div 2

CSA Certificate
Power Supplies for Hazardous Location
Applicable for Canada and US
CSA Class: 5318-01 (Canada), 5318-81 (USA)
Temperature Code: T3
Groups: A, B, C and D

Class I Div. 2

UL Certificate
Recognized component for category QQPX - Power Supplies for
Use in Hazardous Locations
Applicable for US and Canada
E-File: E246846
Temperature Code: T3
Groups: A, B, C and D

IEC 60068-2-60

Manufacturer's Declaration (Online Document)
Environmental Tests, Flowing Mixed Gas Corrosion Test
Test Ke - Method 4
H2S: 10ppb
NO2: 200ppb
Cl2: 10ppb
SO2: 200ppb
Test Duration: 3 weeks, which simulates a service life of 10 years

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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DC-UPS, DUAL OUTPUT

U–Series

ISA-71.04 G3

Manufacturer's Declaration (Online Document)
Airborne Contaminants Corrosion Test
Severity Level: G3 Harsh
H2S: 100ppb
NOx: 1250ppb
Cl2: 20ppb
SO2: 300ppb
Test Duration: 3 weeks, which simulates a service life of 10 years.

VDMA 24364

Paint Wetting Impairment Substances Test (or LABS-Test)
Tested for Zone 2 and test class C1 according to VDMA 24364-C1L/W for solvents and water-based paints

20. REGULATORY PRODUCT COMPLIANCE
EU Declaration ofConformity

The CE mark indicates conformance with the- EMC directive- Low-voltage directive (LVD)- RoHS directive

REACH Directive

Manufacturer's Statement
EU-Directive regarding the Registration, Evaluation,
Authorization and Restriction of Chemicals

WEEE Directive

Manufacturer's Statement
EU-Regulation on Waste Electrical and Electronic Equipment
Registered in Germany as business to business (B2B) products.

EAC TR Registration

EAC Certificate
EAC EurAsian Conformity - Registration Russia, Kazakhstan andBelarus8504408200, 8504409000

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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21. USED SUBSTANCESThe unit does not release any silicone and is suitable for the use in paint shops.
The unit conforms to the RoHS directive 2002/96/EC.
Electrolytic capacitors included in this unit do not use electrolytes such as Quaternary Ammonium Salt Systems.
Plastic housings and other molded plastic materials are free of halogens.
The materials used in our production process do not include the following toxic chemicals:
Polychlorinated Biphenyl (PCB), Pentachlorophenol (PCP), Polychlorinated naphthalene (PCN), PolybrominatedBiphenyl (PBB), Polybrominated Biphenyl Oxide (PBO), Polybrominated Diphenyl Ether (PBDE), PolychlorinatedDiphenyl Ether (PCDE), Polybrominated Diphenyl Oxide (PBDO), Cadmium, Asbestos, Mercury, Silica

22. PHYSICAL DIMENSIONS AND WEIGHT
Width
HeightDepth
WeightDIN rail

49mm / 1.93’’124mm / 4.88’’
Plus height of signal and 12V output connector plug see Fig. 22-1
117mm / 4.61’’
Plus depth of DIN rail
650g / 1.43lb
Use 35mm DIN rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
The DIN rail depth must be added to the depth (117mm) to calculate the total required installation
depth.

Electronic files with mechanical data can be downloaded at www.pulspower.com
Fig. 22-1 Side viewFig. 22-2 Front view

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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23. INSTALLATION NOTESMounting:
The power terminal shall be located on top of the unit. An appropriate electrical and fire end-product enclosure
should be considered in the end use application.
Cooling: Convection cooled, no forced air cooling required. Do not obstruct air flow!
Installation clearances: 40mm on top, 20mm on the bottom, 5mm on the left and right side are recommended
when loaded permanently with full power. In case the adjacent device is a heat source, 15mm clearance arerecommended.
Risk of electrical shock, fire, personal injury or death!
Turn power off and disconnect battery fuse before working on the DC-UPS. Protect against inadvertent re-powering.
Make sure the wiring is correct by following all local and national codes. Do not open, modify or repair the unit.
Use caution to prevent any foreign objects from entering into the housing.
Do not use in wet locations or in areas where moisture or condensation can be expected.
Service parts:
The unit does not contain any service parts. The tripping of an internal fuse is caused by an internal fault. If damage
or malfunctioning should occur during operation, immediately turn power off and send unit to the factory for
inspection!
Wiring and installation instructions:(1) Connect the power supply to the input terminals of the DC-UPS.
(2) Connect the battery to the battery terminals of the DC-UPS. It is recommended to install the battery outside thecabinet or in a place where the battery will not be heated up by adjacent equipment. Do not install the battery
in airtight housings or cabinets. The battery should be installed according to EN50272-2, which includes sufficientventilation. Batteries store energy and need to be protected against energy hazards. Use a 30A battery fuse typ
ATO® 257 030 (Littelfuse) or similar in the battery path. The battery fuse protects the wires between the battery
and the DC-UPS. It also allows the disconnection of the battery from the DC-UPS which is recommended whenworking on the battery or DC-UPS. Disconnect battery fuse before connecting the battery.
Please note: Too small or too long wires between the DC-UPS and the battery can shorten the buffer time or can
result in a malfunction of the DC-UPS. Do not use wires smaller than 2.5mm2 (or 12AWG) and not longer than
2x1.5m (cord length 1.5m). Avoid voltage drops on this connection.
(3) Connect the buffered load to the output terminals of the DC-UPS. The 24V output is placed on top of the unit.
The 12V output is placed on bottom of the unit behind the signal plug. The output is decoupled from the input
allowing load circuits to be easily split into buffered and non buffered sections. Noncritical 24V loads can beconnected directly to the power supply and will not be buffered. The energy of the battery can then be used in
the circuits which require buffering.
(4) Install the battery fuse when the wiring is finished.
Fig. 23-1 Typical wiring diagram

24V+ buffered

-

N

L PE

+

+

-

-

24V 12V 24V

DC-UPS
UB10.245-+

IN BAT OUT

12V
Battery

12V

-

+

24V
Power
supply-++-branch12V+ bufferedbranch-Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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UB10.245
DC-UPS, DUAL OUTPUT

U–Series

24. ACCESSORIES
24.1. BATTERY MODULES
Two pre-assembled battery modules with a single 12V battery are available for different buffer times. As an option,
the mounting brackets are also available without batteries. This option offers more flexibility in selecting anappropriate battery or can save shipping and logistic costs. See individual datasheets for detailed information.

Battery typeService life
Dimensions
WeightDIN rail mountable
Order number

UZK12.072
Standard version
12V, 7Ah
3 to 5years
155x124x112mm
3.2kg
yes
UZK12.072
UZO12.072
UZB12.071

UZK12.261
High current version
12V, 26Ah
10 to 12years
214x179x158mm
9.9kg
noUZK12.261
UZO12.26
UZB12.261

Fig. 24-1 UZK12.072

VRLA lead-acid maintenance freebattery
According to EUROBAT guideline
Width x height x depth

Battery module
Mounting bracket without battery
Replacement battery only
Fig. 24-2 UZK12.261

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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UB10.245
DC-UPS, DUAL OUTPUT

U–Series

24.2. ZM10.WALL - WALL MOUNTING BRACKETThis bracket is used to mount the devices on a wall/panel without utilizing the DIN rail. The bracket can be mounted
without detaching the DIN rail brackets from the power supply. Product for illustration purpose only.
Fig. 24-3 Isometric viewFig. 24-6 Wall/panel mounting,front viewFig. 24-4 Isometric viewFig. 24-7 Hole pattern for wall
mounting

Fig. 24-5 Isometric viewFig. 24-8 Wall/panel mounting, side view

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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UB10.245
DC-UPS, DUAL OUTPUT

U–Series

25. APPLICATION NOTES
25.1. BATTERY REPLACEMENT INTERVALS
Batteries have a limited life time. They degrade slowly beginning from the production and need to be replaced
periodically. The design life figures can be found in the individual datasheets of the batteries and usually is specified
according to the Eurobat guideline or according to the manufacturer’s specifications.
The design life is the estimated life based on laboratory condition, and is quoted at 20°C using the manufacturer’s
recommended float voltage condition. According to the Eurobat guideline, design lives have been structured into thefollowing different groups:
3 - 5 years:

This group of batteries is very popular in standby applications and in small emergency equipment.
This represents a 4 years design life with a production tolerance of ±1 year.
6 - 9 years:
This group of batteries is usually used when an improved life is required.
This represents a 7.5 years design life with a production tolerance of ±1.5 years.
10 - 12 years: This group of batteries is used when in applications where longest life and highest safety level are
required. This represents a 11 years design life with a production tolerance of ±1 year.
A battery failure within the specified design life of the battery usually results in a complete loss of the battery
function (broken cell, defect connection, …) and will be detected and reported by the periodical battery tests which
are included in the UB10.245 DC-UPS control unit.
If the operational parameters differ from those which are specified for the design life, an earlier change of thebattery might be necessary. The “real life” is called service life and is defined as the point at which the cell’s actual
capacity has reached 80% of its nominal capacity. At the end of the service life the capacity degrades much faster, sothat a further use of the battery is not recommended.
Temperature effect:
The temperature has the most impact in the service life. The hotter the temperature, the earlier the wear-out phaseof the battery begins. The wear-out results in a degradation of battery capacity. See Fig. 25-1 for details.
Effect of discharging cycles
The number as well as the depth of discharging cycles is limited. A replacement of the battery might be necessary
earlier than the calculated service life if the battery exceeds the numbers and values of Fig. 25-2.
Other effects which shortens the service lifeOvercharging and deep discharging shortens the service life and should be avoided. Thanks to the single
battery concept of the UB10.245, the end-of-charge-voltage can be set very precisely to the required value
and thereby avoiding unnecessary aging effects.

Charge retention is important to get the longest battery life. Stored batteries which are not fully charged
age faster then charged batteries. Batteries which are not in use should be recharged at least once a year.



Excessive float charge ripple across the battery has an effect of reducing life and performance. The UB10.245
does not produce such a ripple voltage. This effect can be ignored when the battery is charged with the
UB10.245.

Guidelines for a long battery service life:

Place the battery in a cool location: E.g. near the bottom of the control cabinet.



Do not place the battery near heat generating devices.



Do not store discharged batteries.



Do not discharge the battery more than necessary. Set buffer time limiter to the required buffer time.

When choosing the battery capacity, always try to get the next higher capacity than required. The depth ofdischarge reduces the service life of the battery and limits the number of cycles. See Fig. 25-2 .

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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DC-UPS, DUAL OUTPUT

U–Series

Example for calculating the service life and the required replacement cycle:
Parameters for the example:


A 7Ah battery with a design life of 3-5 years is used (e.g. Yuasa battery from the battery module UZK12.072)

The average ambient temperature is 30°C

One buffer event consumes approx. 25% of the achievable buffer time.

One buffer event per day

Calculation:
Ambient temperature influence:
According to Fig. 25-1 curve A, a 2 years service life can be expected for an ambient temperature of 30°C.
Number of discharging cycles: 2 years * 365 cycles = 730cycles in 2 years.
According to Fig. 25-2, curve C has to be used (only 25% of battery capacity is required). 730 cycles have only anegligible influence in a battery degradation and can be ignored.
Result:The battery shall be replaced after 2 years.
Please note that the battery degrading begins from the production date (check date code on the battery) which may
shorten the replacement intervals.
Fig. 25-1 Service life versus ambient
temperatures, typ *)Cell Capacity

Service Life in Years

10
9
8
7
6
5
4
3
2
1

20°C
*)

120%
Design Lifeof Battery
A: 3-5 Years
B: 6-9 Years
C: 10-12 Years

C
B

Fig. 25-2 Cell capacity degradation vs. discharging
cycles *)

C

100%
80%

B
A

60%

Depth ofdischarge
A: 100%
B: 50%
C: 30%

40%

A

20%

Number of Discharging Cycles

Ambient Temperature

25°C

30°C

35°C

40°C 45°C

0UZK12.071 200
UZK12.261 80

400
160

600
240

800
320

1000 1200
400 480

datasheet figures from battery manufacturer

25.2. PARALLEL AND SERIAL USE
Do not use the DC-UPS in parallel to increase the output power. However, two units of the DC-UPS can be paralleled
for 1+1 redundancy to gain a higher system reliability.
Do not use batteries in parallel, since the battery quality test might create an error message.
Do not connect two or more units in series for higher output voltages.
Do not connect two or more units in a row to get longer hold-up times.

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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UB10.245
DC-UPS, DUAL OUTPUT

U–Series25.3. USING THE INHIBIT INPUT
The inhibit input disables buffering. In normal mode, a static signal is required. In buffer mode, a signal with aminimum length of 250ms is required to stop buffering. The inhibit is stored and can be reset by cycling the input
voltage.
For service purposes, the inhibit input can also be used to connect a service switch. Therefore, the inhibit signal canbe supplied from the output of the DC-UPS.
Fig. 25-3 Wiring example for inhibit input

Power
SupplyInput
N L PE+-+-+-IN BAT OUT

24V

12V 24V

Buffered
Load

DC-UPS
Signal Port

InhibitOutput

-

++- -

-

12V
Battery+++-

Service
Switch

25.4. TROUBLESHOOTINGThe LEDs on the front of the unit and relay contacts indicate about the actual or elapsed status of the DC-UPS. Pleasesee also chapter 12.
The following guidelines provide instructions for fixing the most common failures and problems. Always start withthe most likely and easiest-to-check condition. Some of the suggestions may require special safety precautions. Seenotes in chapter 23 first.
“Check wiring” LED is on

Check correct wiring between the battery and the DC-UPS
Check battery fuse. Is the battery fuse inserted or blown?
Check battery voltage (must be typically between 7.4V and 15.1V)
Check input voltage (must be typically between 22.8V and 30V)
Check battery polarity

DC-UPS did not buffer

Inhibit input was set
Battery did not have enough time to be charged and is still below the deep discharge
protection limit.

DC-UPS stopped buffering

Buffer time limiter stopped buffering  set buffer time limiter to a higher value
Deep discharge protection stopped buffering  use a larger battery, or allow
sufficient time for charging the battery
Output was overloaded or short circuit  reduce load

Output has shut down

Cycle the input power to reset the DC-UPS
Let DC-UPS cool down, over temperature protection might have triggered.

DC-UPS constantly switches between normal mode and buffer mode
The supplying source on the input is too small and can not deliver sufficient current
 Use a larger power supply or reduce the output load

Aug. 2021 / Rev. 1.3 DS-UB10.245-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.
www.pulspower.com Phone +49 89 9278 0Germany

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