UB10.242
24V, 10A, DC-UPS

U–Series

DC-UPS CONTROL UNIT
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■
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■
■
■
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■

Requires Only One 12V Battery for a 24V Output
Allows Batteries Between 17Ah and 130Ah
Battery Charging with Temperature Tracking
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

GENERAL DESCRIPTIONSHORT-FORM DATAThis uninterruptible power supply (UPS) controller
UB10.242 is an addition to standard 24V power
supplies to bridge power failures of remote or
emergency systems which must be kept fully inoperation for e.g. 72 hours.

Input voltage
range
Output current

The DC-UPS includes an internal temperature sensor
and a professional battery management system
which charges and monitors the battery to achieve
the longest battery service life as well as many
diagnostic functions that ensure a reliable operationof the entire system.
A unique feature of the UB10 Series is that only one
12V battery is required to buffer the 24V output.
This makes matching batteries unnecessary andallows a precise battery charging and testing.

nom. 24Vdc
22.5-30Vdc
min.15A
Normal modemin. 10A
Buffer mode
Output voltage
typ. 0.23V lower Normal mode
as input voltage
22.25V
Buffer mode, 10A
Allowed batteries 17Ah to 130Ah VRLA lead acid
Temperature range -25 to +50°C
Dimensions
49x124x117mm WxHxD
Buffer time (at 10A) typ. 55 minutes 26Ah battery
typ. 4 hours
100Ah battery
Typical setup of a DC-UPS system:
DC

AC
24V
Power
Supplye.g.:Dimension

ORDER NUMBERS

24V
DC-UPS

12V
Battery

24V
Load

UB10

e.g.:
UZK12.xxx

e.g.: PLC

MARKINGS
For details and the complete approval list, see chapter 20.

DC-UPS

UB10.242

Standard controller

Accessory

UZK12.261

Battery module 12V 26Ah

UZO12.26

Mounting kit w/o battery

ZM10.WALL

Panel/Wall mount bracket

UL 508

UL 60950-1

MarineMarineAug. 2021 / Rev. 1.2 DS-UB10.242-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

Class I Div 2

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UB10.242
24V, 10A, DC-UPS

U–Series

INDEX

PAGE

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

INDEX

PAGE

17. Environment ..................................................... 16
18. Protection Features .......................................... 16
19. Safety ................................................................ 17
20. Approved, Fulfilled or Tested Standards ......... 18
21. Regulatory Product Compliance ...................... 19
22. Used Substances ............................................... 20
23. Physical Dimensions and Weight ..................... 20
24. Installation Notes ............................................. 21
25. Accessories ........................................................ 2225.1. Battery modules ..................................... 2225.2. ZM10.WALL - Wall mounting bracket ... 23
26. Application Notes ............................................. 24
26.1. Battery Replacement Intervals ............... 24
26.2. Parallel and Serial Use ............................ 25
26.3. Using the Inhibit Input ........................... 26
26.4. Troubleshooting ..................................... 26

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. 1.2 DS-UB10.242-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

2/26

UB10.242
24V, 10A, DC-UPS

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 INSTRUCTION
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!

Aug. 2021 / Rev. 1.2 DS-UB10.242-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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UB10.242
24V, 10A, DC-UPS

U–Series

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.
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. 1.2 DS-UB10.242-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

4/26

UB10.242
24V, 10A, DC-UPS

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 voltagemax.

1.5Vpp1Vpp
60Vdc or
42.4Vac
22.8Vdc

typ.
max.
typ.
typ.
max.

Input current

**)

23Vdc
120mA
2.0A
2.7A
No limitation

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 for the DC-UPS
Current consumption for battery charging***)*) 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 6.
Fig. 3-1 Input voltage range

VOUT

A

D

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

Internal
current
consumption

Current
consumption
for battery
charging

Fig. 3-3 Input current and output voltage vs.
output current, typ. (battery fully charged)

Aug. 2021 / Rev. 1.2 DS-UB10.242-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

5/26

UB10.242
24V, 10A, DC-UPS

U–Series

The DC-UPS is equipped with an electronic output
current limitation. This current limitation works
in a switching mode which reduces the power
losses and heat generation to a minimum. As aresult, the output voltage drops since there is notenough current to support the load. A positiveeffect of the current limitation in switching modeis that the input current goes down despite anincrease in the output current resulting in lessstress for the supplying source.

Overload

Output Voltage

20V
10
20A
15
ut
Inp

10
5
0

nt
rre

Cu

Output Current

0

4

8

12

15

20A

4. OUTPUT IN NORMAL MODE
Output voltage in normal modenom.

DC 24V

Voltage drop between input andoutput

max.

0.3V

max.
max.
nom.
nom.
min.
max.

0.45V
20mVpp
15A
360W
17.9A
21A
No limitation

Ripple and noise voltage
Output current
Output power
Short-circuit current
Capacitive and inductive loads*)

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
Continuously allowed
Load impedance 100mOhm, see Fig. 4-2 for typical values
Load impedance 100mOhm, see Fig. 4-2 for typical values

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. 1.2 DS-UB10.242-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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UB10.242
24V, 10A, DC-UPS

U–Series

5. OUTPUT IN BUFFER MODE
If the input voltage falls below a certain value (transfer threshold level), the DC-UPS starts buffering without any
interruption or voltage dips. Buffering is possible even if the battery is not fully charged.
Output voltage in buffer modenom.

Transfer threshold for buffering
Ripple and noise voltage
Output current

typ.
max.
nom.

Short-circuit current

min.
max.

*)
**)

Output voltage is stabilized and independent frombattery voltage
22.45V±1%, at no load,
22.25V±1%, at 10A output current
80mV higher than the output voltage in buffer mode
20mVpp20Hz to 20MHz, 50Ohm
10A
Continuously allowed
15A< 5s with full output voltage*)
17.9A
Load impedance 100mOhm**)
21A
Load impedance 100mOhm**)
DC 24V

If the output current is in the range between 10A and 15A for longer than 5s, a hardware-controlled reduction of the
maximal output current to 10A occurs. If the 10A are not enough to maintain the 24V, buffering stops 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 modet

Fig. 5-3 Available output current in buffer
mode

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

Output Voltage

25V

Output Current

A

20
15A

BonusPower®

B

15

D

10

10A

C

5
0

5A
Time

0
0

5 Sec.

OutputCurrent

0

5

10

15

20

25A

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

A
BC

Aug. 2021 / Rev. 1.2 DS-UB10.242-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

7/26

UB10.242
24V, 10A, DC-UPS

U–Series

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

nom.

Battery voltage range

typ.
typ.
typ.

9.0–15.0V
35Vdc
7.4V
17Ah
130Ah
100mOhm
CC-CV
3.0A
3.4A
13.0-14.4V
9h*)
34h*)
21A

typ.
max.
typ.

0.3A
50µA
270mA

typ.
typ.

10.5V
9.8V

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,
See chapter 13
For a 26Ah battery
For a 100Ah battery
Buffer mode, 10A output current, 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 0A output current
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.
**) 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 thebattery terminals which increases the discharging current. See also chapter 24 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. 6-1 Battery discharging current
vs. output current, typ.
Battery Current

A

30A

B

C

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

12.5 15A

Aug. 2021 / Rev. 1.2 DS-UB10.242-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

8/26

UB10.242
24V, 10A, DC-UPS

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 standard battery modules.
Buffer time with 26Ah battery (UZK12.261)

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

Buffer time with 100Ah battery*)

99’30’’
39’
130’
55’
62h 20’3h82h 20’4h

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 0.5A output current*)
At 10A output current*)
At 0.5A 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. output current with a 65Ah and a 100Ah battery
Buffer Current

Buffer Current

2A

10A
A: 65Ah Battery
B: 100Ah Battery

8
B

6

A: 65Ah Battery
B: 100Ah Battery

1.5
B

A

1.0

4

A

0.5

2
Buffer Time (Hours)

0
5

5

10

15

Buffer Time (Hours)

0
20

25

30h

30

40

50

60

70

80

90h

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 the appropriable battery capacity is reducedwith such currents. When the battery 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”.
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 than C20 (discharging current for 20h).

Aug. 2021 / Rev. 1.2 DS-UB10.242-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

9/26

UB10.242
24V, 10A, DC-UPS

U–Series

8. EFFICIENCY AND POWER LOSSES
Efficiency
Power losses

typ.
typ.
typ.
typ.
typ.

97.8%
2.9W
5.5W
7.2W
18.5W

Normal mode, 10A output current, battery fully charged
Normal mode, 0A output current, battery fully charged
Normal mode, 10A output current, battery fully charged
During battery charging, 0A output current
Buffer mode, 10A output current

Fig. 8-1 Efficiency at 24V, typ.

Fig. 8-2 Losses at 24V, typ.

Power losses versus output current

Efficiency vs. output
current in normal mode

98%
97.5
97.0
96.5
96.0
95.5
95.0
94.5

18W

A: Buffer Mode
B: Charging Mode
C: Normal Mode

15
12

A

B

9
6
Output Current

3

5

7

11

9

C

3
13

Output Current

0

15A

0

2.5

5

7.5

10

12.5

15A

9. FUNCTIONAL DIAGRAM
Fig. 9-1 Functional diagram

DC- UPS
+

24V
Power
SupplyInput-

Input Fuse&
ReversePolarity
Protection

Electronic
Current
Limiter*+
Output(7)

Temp.

Battery
Charger

Step-upConverter(8)

Controller-+

Status LED (green)
Check Wiring LED (red)+Battery

Inhibit +Inhibit -Diagnosis LED (yellow)

Battery
Tester12V Battery

Buffered
Load

Battery Temperature

Cut-off
Relay(1)
Ready Contact(2)-(3) Buffering(4) Contact(5)
Replace Battery(6)*)

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. 1.2 DS-UB10.242-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

10/

UB10.242
24V, 10A, DC-UPS

U–Series

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 analysing 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 26.1. 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.
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 170 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.
When “Replace battery” is indicated, it is recommended to replace battery as soon as possible.

11. END-OF-CHARGE VOLTAGE
The end-of-charge voltage depends on the temperature of the battery. A too high end-of-charge voltage candamage the battery and shorten its lifetime. Therefore, the DC-UPS has an internal temperature sensor included,
which regulates the end-of-charge voltage depending of the battery temperature. To achieve the longest lifetime,
the battery should be placed at a coldest location.
The temperature difference between the DC-UPS and the battery requires a correction of the end-of-charge voltage.
This can be done with the selector on the front side of the unit. For details see chapter 15.

Aug. 2021 / Rev. 1.2 DS-UB10.242-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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UB10.242
24V, 10A, DC-UPS

U–Series

12. 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 is recognized, input
voltage is enough 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:

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 26.3 for application hints.

7+3mA

Inhibit
5.1V

8-Signal voltage
Signal current
Inhibit threshold
Isolation

max.
max.
min.
max.
nom.

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

Aug. 2021 / Rev. 1.2 DS-UB10.242-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

12/

UB10.242
24V, 10A, DC-UPS

U–Series

13. FRONT SIDE USER ELEMENTS
A

Power Port
Quick-connect spring-clamp terminals, connection for input voltage,
output voltage and battery

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 12.

C

Green Status LED
Ready: Battery is charged > 85%, no wiring failure is recognized, input
voltage is enough 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

1
0

Ready

1
0

Charging

10

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.
Inhibit active: Indicates that buffering is disabled due to an active inhibit
signal.
Flashing pattern of the yellow diagnosis LED:
10Overload

10

Replace
Battery10InhibitactiveE

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

F

Battery Temperature Selector
A: Same than this unit
B: 10°C lower than this unit
C:

20°C lower than this unit

D:
E:
F:

Battery temperature is 30°C
Battery temperature is 20°C
Battery temperature is 10°C

Temperature compensated end-of-charge voltage
Temperature compensated end-of-charge voltage with an offset
conditional upon the temperature
Temperature compensated end-of-charge voltage with an offset
conditional upon the temperature
Fixed end of charge voltage for 30°C battery temperature
Fixed end of charge voltage for 20°C battery temperature
Fixed end of charge voltage for 10°C battery temperature

Aug. 2021 / Rev. 1.2 DS-UB10.242-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

13/

UB10.242
24V, 10A, DC-UPS

U–Series

14. TERMINALS AND WIRINGType

Solid wire
Stranded wire
AWG
FerrulesPull-out force

Tightening torque
Wire stripping length

Power terminals
Bi-stable, quick-connect springclamp terminals. IP20 Fingertouch-proof. Suitable for fieldand factory installation. Shippedin open position.
0.5-6mm2
0.5-4mm220-10AWG
Allowed, but not required
10AWG:80N, 12AWG:60N,
14AWG:50N, 16AWG:40N
according to UL486E
Not applicable
10mm / 0.4inch

Signal terminals
Plug connector with screw terminal. Finger-touch-proof
construction with captive screws for 3.5mm slottedscrewdriver. Suitable for field- and factory installation.
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

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

Fig. 14-1 Spring-clamp terminals, connecting a wire

Instructions:

Insert wire

Close the levera)

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

To disconnect wire, reverse the procedure

15. RELIABILITY
Lifetime expectancy

MTBF SN 29500, IEC 61709
MTBF MIL HDBK 217F

min.
min.
min.

137 400h> 15 years> 15 years
886 000h
1 482 000h
397 900
545 000

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, 25°C
At 10A output current, 40°C, ground benign GB40
At 10A output current, 25°C, ground benign GB25

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. 1.2 DS-UB10.242-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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UB10.242
24V, 10A, DC-UPS

U–Series

16. EMCThe unit is suitable for applications in industrial environment as well as in residential, commercial and light industry
environment without any restrictions. The CE mark indicates conformance with EMC guideline 89/336/EC, 93/68/EC
and2004/108/EC and the low-voltage directive (LVD) 73/23/EC, 93/68/EC and 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-2.7GHz
Out- and input lines
Signal lines**)
Output +  Input +  + / -  housing
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
10V
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
Output lines
Class B*)
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

The DC-UPS has three converters with three different
switching frequencies included.
100kHzConstant frequency
78kHz
Constant frequency
19.5kHz
Constant frequency

Aug. 2021 / Rev. 1.2 DS-UB10.242-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

15/

UB10.242
24V, 10A, DC-UPS

U–Series

17. ENVIRONMENT
Operational temperature-25°C to +50°C

Storage temperature
Humidity-40 to +85°C
5 to 95% r.H.

Vibration sinusoidal
Shock
AltitudeOver-voltage category

2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g
30g 6ms, 20g 11ms
0 to 6000m
III
II
2

Degree of pollution

Full power, for the DC-UPS control unit.
Keep battery in a cooler environment!
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
EN 50178
EN 50178 above 2000m altitude
EN 50178, not conductive

Fig. 17-1 Output current vs. ambient temperature

Fig. 17-2 Output current vs. ambient temperature

Allowable Output Current in Normal Mode

Allowable Output Current in Buffer Mode

15A

15A

12.5

12.5

10

10

7.5

7.5

5

5

2.5
0
-25

10

20

30

continuous

2.5

Ambient Temperature0

for typ. 5s

40

50°C

0
-25

Ambient Temperature

0

10

20

30

40

50°C

The ambient temperature is defined 2cm below the unit.

18. PROTECTION FEATURES
Output protection
Output over-voltage protection
in buffer mode
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
In case of an internal defect, a redundant circuitry
max. 35Vdc
limits the maximum output voltage. The output
automatically shuts-down and makes restart attempts.
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 shutdown with automatic restartyesMax. 35Vdc, no harm or defect of the unit
25A, blade type
No user accessible part, no service partAug. 2021 / Rev. 1.2 DS-UB10.242-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

16/

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24V, 10A, DC-UPS

U–Series

19. SAFETY
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. 1.2 DS-UB10.242-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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UB10.242
24V, 10A, DC-UPS

U–Series

20. 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

Marine (DNV)

DNV Certificate
DNV Type approved product
Certificate: 12508-10HH
Temperature: Class D
Humidity: Class B
Vibration: Class C
EMC: Class B
Enclosure: Class A

Aug. 2021 / Rev. 1.2 DS-UB10.242-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

18/

UB10.242
24V, 10A, DC-UPS

U–Series

Marine (ABS)ABS Design Assessment Certificate
ABS (American Bureau of Shipment) assessed product
Certificate: 17-HG1599236-PDA

Corrosion

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

IEC 60068-2-60
Method 4

Corrosion
ISA-71.04 G3

VDMA 24364

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.
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

21. 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

Registration for the Eurasian Customs Union market(Russia, Kazakhstan, Belarus)

Aug. 2021 / Rev. 1.2 DS-UB10.242-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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24V, 10A, DC-UPS

U–Series

22. USED SUBSTANCESThe unit does not release any silicone and is suitable for the use in paint shops.
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, wires and cables are not PVC insulated.
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

23. PHYSICAL DIMENSIONS AND WEIGHT
Width
HeightDepth
WeightDIN rail

49mm / 1.93’’124mm / 4.88’’
Plus, height of signal connector plug
117mm / 4.61’’
Plus, depth of DIN rail
545g / 1.2lb
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. 23-1 Side viewFig. 23-2 Front view

Aug. 2021 / Rev. 1.2 DS-UB10.242-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

20/

UB10.242
24V, 10A, DC-UPS

U–Series

24. 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 more than 5A.
Do not place heat sources next to the UB10.242 since it can influence the function of the internal temperature sensor.
Keep a minimum of 15mm to the adjacent device.
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 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. Do not install the battery in airtight housings orcabinets. The battery should be installed according to EN50272-2, which includes enough ventilation. Batteries
store energy and need to be protected against energy hazards. Use a 30A battery fuse typ ATO® 257 030 (Littlefuse) 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 when working on thebattery 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 output is decoupled from the input
allowing load circuits to be easily split into buffered and non buffered sections. Noncritical 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 requires buffering.
(4) Install the fuse when the wiring is finished.
Fig. 24-1 Typical wiring diagram
24V
Non-bufferd
branches

24V
Power
SupplyN

DC-UPS
UB10.242-

12V
Battery
Module-Buffered
Load

+

-

24V

+

-

12V

IN BAT OUT

+

+

-

24V

+

-

+

+

24V
bufferedbranches-

Nonbuffered
Load

L PE

Aug. 2021 / Rev. 1.2 DS-UB10.242-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

21/

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24V, 10A, DC-UPS

U–Series

25. ACCESSORIES
25.1. BATTERY MODULES
One pre-assembled battery module with a single 12V battery is available. As an option, the mounting bracket is alsoavailable without battery. This option offers more flexibility in selecting an appropriate battery or can save shipping
and logistic costs. See individual datasheet for detailed information.

Battery typeService life
Dimensions
WeightDIN rail mountable
Order number

UZK12.261
High current version12V, 26Ah
10 to 12years
214x179x158mm
9.9kg
noUZK12.261
UZO12.26
UZB12.261

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

Battery module
Mounting bracket without battery
Replacement battery only

Fig. 25-1 UZK12.261

Aug. 2021 / Rev. 1.2 DS-UB10.242-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

22/

UB10.242
24V, 10A, DC-UPS

U–Series

25.2. 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. 25-2 Isometric viewFig. 25-5 Wall/panel mounting,side viewFig. 25-3 Isometric viewFig. 25-6 Hole pattern for wall
mounting

Fig. 25-4 Isometric viewFig. 25-7 Wall/panel mounting, side view

Aug. 2021 / Rev. 1.2 DS-UB10.242-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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UB10.242
24V, 10A, DC-UPS

U–Series

26. APPLICATION NOTES
26.1. BATTERY REPLACEMENT INTERVALS
Batteries have a limited lifetime. 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 UB10.242 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. 26-1 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. 26-2.
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 UB10.242, the end-of-charge-voltage can be set very precisely to the required value athereby 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 UB10.242
does not produce such a ripple voltage. This effect can be ignored when the battery is charged with the
UB10.242.

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. 26-2.

Aug. 2021 / Rev. 1.2 DS-UB10.242-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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24V, 10A, DC-UPS

U–Series

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

A 26Ah battery with a design life of 10-12 years is usedThe average ambient temperature is 30°C

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

One buffer event every two days

Calculation:
Ambient temperature influence:
According to Fig. 26-1 curve C, a 5 years service life can be expected for an ambient temperature of 30°C.
Number of discharging cycles: 5 years * 182 cycles = 910cycles in 5 years.
According to Fig. 26-2, curve C has to be used (only 25% of battery capacity is required). 910 cycles have only anegligible influence in a battery degradation and can be ignored.
Result:The battery shall be replaced after 5 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. 26-1 Service life versus ambient
temperatures, typ *)Service Life in Years

10
9
8
7
6
5
4
3
2
1

20°C
*)

Cell Capacity

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

Fig. 26-2 Cell capacity degradation vs. discharging
cycles *)

B

120%

C

100%
B

80%

A

60%
A

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

40%
20%

Number of Discharging Cycles

Ambient Temperature

25°C

30°C

35°C

40°C 45°C

0

200

400

600

800

1000 1200

datasheet figures from battery manufacturer

26.2. 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 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. 1.2 DS-UB10.242-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

25/

UB10.242
24V, 10A, DC-UPS

U–Series

26.3. USING THE INHIBIT INPUT
The inhibit input disables buffering. In normal mode, a static signal is required. In buffer mode, a pulse with aminimum length of 250ms is required to stop buffering. The inhibit is stored and can be reset by cycling the input
voltage.
If the inhibit signal is active in normal mode, an internal relay contact will be opened, and the battery will not longer
be charged.
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.

IN

24V
Power
SupplyBATOUTDC-UPSUB10Signal Port

+ -

-

+

-

24V

+

+

-

12V

Inhibit

-

24V

+

-

+

+

Fig. 26-3 Wiring example for inhibit input

12V
Battery
Module-Buffered
Load

Service
Switch

26.4. 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 13.
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 24 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

Deep discharge protection stopped buffering  use a larger battery, or allow
enough 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 enough current
 Use a larger power supply or reduce the output load

Aug. 2021 / Rev. 1.2 DS-UB10.242-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

26/