UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

BUFFER MODULE







Buffering with electrolytic capacitors instead of leadacid batteries
Buffering of 24V loads
Minimum hold-up time 0.16s at 40A, longer hold-up
time at lower loads
Clear status indication by status LED and signaling
terminals
Extra large screw terminals
3 Years warranty

GENERAL DESCRIPTIONSHORT-FORM DATAThe UF40 buffer module is a supplementary device forregulated DC 24V power supplies, which can be used forvarious purposes:- Deliver DC-power to bridge failures of the DC
voltage supply system.
- Extend the hold-up time after loss of the AC power.
- Deliver extra short-term peak current above thecurrent rating of the power supply.

Supply voltage
Required voltage tocharge capacitors
Threshold voltage
for buffer mode
Buffer voltage
Buffer current
Charging time
Current consumption

It utilizes service-free electrolytic capacitors for storing
the energy which allows usage even at ambient
temperatures up to +70°C.
The buffer module does not require any control wiring.
It can be added in parallel to the load circuit at any
given point.

Power dissipation
Buffer time

Buffer modules can be connected in parallel to increase
the output ampacity or the hold-up time.
Temperature range
Dimensions
WeightORDER NUMBERS

DC 24V -20%/+25% 19.2-30Vdc
23Vdc
22.5V / VIN-1V

Selectable

22.5V / VIN-1V
40A
Typ. 34s
Typ. 80mA
Max. 600mA
1.9W
Min. 160ms
Min. 320ms
Typ. 250ms
Typ. 500ms
Typ. 62s-25°C to +70°C
64x124x142mm
1040g / 2.3lb

Selectable

Stand-by mode
During charging
Stand-by mode
At 22.5V, 40A
At 22.5V, 20A
At 22.5V, 40A
At 22.5V, 20A
At 22.5V, 0.1A
operational
WxHxD

MARKINGS

Buffer Module UF40.241
Accessory

ZM2.WALL
ZM14.SIDE

Panel/ wall-mount bracket
Side-mount bracket

IND. CONT. EQ.

UL 61010-2-201

UL 60950-1

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

EMC

1/20

UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

INDEX
Page
1. Intended Use .......................................................3
2. Installation Notes ................................................3
3. Functional Description ........................................4
4. Electrical Ratings .................................................5
5. Selection of the Back-up Threshold Voltage .....6
6. Buffer Time ..........................................................6
7. Charging Time .....................................................7
8. Operating Diagrams............................................7
9. Active Signal ........................................................8
10. Ready Signal ........................................................8
11. Inhibit Input.........................................................8
12. Efficiency and Power Losses................................913. Lifetime Expectancy and MTBF...........................9
14. Functional Diagram...........................................10
15. Terminals and Wiring ........................................10Page
16. Front Side and User Elements .......................... 11
17. EMC ................................................................... 12
18. Environment ..................................................... 13
19. Protection Features .......................................... 13
20. Safety Features ................................................. 13
21. Dielectric Strength............................................ 14
22. Approvals and Fulfilled Standard .................... 15
23. Regulatory Compliance .................................... 16
24. Physical Dimensions and Weight ..................... 17
25. Accessories ........................................................ 18
25.1. ZM2.WALL - Wall mounting bracket ....... 18
25.2. ZM14.SIDE - Side Mounting Bracket ........ 19
26. Wiring Diagrams............................................... 20

The information given in this document is correct to the best of our knowledge and experience at the time of publication. If not
expressly agreed otherwise, this information does not represent a warranty in the legal sense of the word. As the state of ourknowledge and experience is constantly changing, the information in this data sheet is subject to revision. We therefore kindly ask
you to always use the latest issue of this document (available under www.pulspower.com). No part of this document may be
reproduced or utilized in any form without our prior permission in writing.
Some parts of this unit are patent by PULS (US patent No 091662,063, Des. 424,529, …).

TERMINOLOGY AND ABREVIATIONSPower supply mode

Describes a condition where the supply voltage is in the rated supply voltage range and the
supplying power supply can deliver a sufficient amount of current for the buffer module andthe load. The mode can also be called “Normal mode”.

Buffer mode

Describes a condition where the input voltage is below the transfer threshold level, the unit
is running on capacitors (buffering) and the output is loaded within the allowed limits.
The mode can also be called “Capacitor mode”.

Inhibit mode

Describes a condition where buffering is disabled on purpose (e.g. for service actions).

T.b.d.

To be defined, value or description will follow later.

DC 24VA figure displayed with the AC or DC before the value represents a nominal voltage withstandard tolerances included.
E.g.: DC 12V describes a 12V battery disregarding whether it is full (13.7V) or flat (10V).

24Vdc

A figure with the unit (Vdc) at the end is a momentary figure without any additional
tolerances included.

may

A key word indicating flexibility of choice with no implied preference.

shall

A key word indicating a mandatory requirement.

shouldA key word indicating flexibility of choice with a strongly preferred implementation.

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

2/20

UF40.241
UF-Series

24V, 40A, 160MS, BUFFER MODULE

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 NOTESInstall 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 power terminals on the top of the unit.
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.
The device is designed for pollution degree 2 areas in controlled environments. No condensation or frost is allowed.
The enclosure of the device provides a degree of protection of IP20. The enclosure does not provide protection against
spilled liquids.
The isolation of the devices is designed to withstand impulse voltages up to 1.5kV according to IEC 60664-1.
The device can be powered from a regulated power supply or a similar DC source. The continuous voltage between
the supply voltage terminals and the PE potential must not exceed 60Vdc. Use an appropriately sized 24V power
supply, which can deliver the additional internal current consumption, required to charge the capacitors. Check forcorrect supply voltage polarity. The device will not operate when the voltage is reversed. The device must be poweredfrom a PELV or SELV source or an "Isolated Secondary Circuit" in order to maintain a SELV or PELV level.
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, 0mm left and right side.
The device is designed for altitudes up to 5000m (16400ft).
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.
For EMI reasons, signal lines (ready, active and inhibit) must be shorter than 30m.

WARNING

Risk of electrical shock, fire, personal injury or death.

- Turn power off before working on the device. Protect against inadvertent re-powering.
- Make sure that the wiring is correct by following all local and national codes.
- Do not modify or repair the unit.
- Do not open the unit as dangerous voltages may be present inside.
- 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.
- Do not touch during power-on, and immediately after power-off. Hot surfaces may cause burns.

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

3/20

UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

3. FUNCTIONAL DESCRIPTION
Working principle
When the power supply provides sufficient voltage, the buffer module stores energy inthe integrated electrolytic capacitors. In case of a voltage dip or loss, this energy isreleased to the DC bus in a regulated process.
Bridges mains faults without interruption
Statistic show that 80% of all mains fault lasts less than 0.2s. These mains faults arecompletely bridged by the buffer unit. This increases the reliability of the system as awhole.

Load--

optional+-

BufferModule++L PE

Buffer Module

AC
DC

Buffer Module

Power
SupplyAC

BufferModule

Load

+
-

DC

Fig. 3-2 Transfer behavior

Power
SupplyOutputN

Discharge

DC

Easy to handle, expandable and maintenance-free
The buffer module does not require any control wiring. It can be added parallel to theload circuit at any given point. Buffer modules can be connected in parallel to increase
the output ampacity or the hold-up time.

Power
SupplyStorageAC

Extended hold-up time
Once mains power fails or is switched off, the buffer unit will continue to provide theload current for a defined period of time. Process data can be saved and processes can beterminated before the DC power switches off. Controlled restarts are subsequently
possible.

Fig. 3-1 Typical wiring diagram

ChargeDC

Transfer ThresholdtSupplyVoltage
Power
SupplyMode

BufferModeJul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0GermanyPower
SupplyMode t4/20

UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

4. ELECTRICAL RATINGS
Supply voltage
Supply voltage range1)
Normal operating voltage range2)
Transfer voltage for switching
into buffer mode

Nom.
Nom.
Typ.
Typ.
Typ.

Transfer voltage for switchingfrom buffer mode into power
supply mode

Typ.
Typ.

Buffer voltage
Ripple and noise voltage- in buffer mode
- in power supply mode
Current consumption

Typ.
Max.

Power dissipation
Buffer current
Buffer current overload behavior
Allowed voltage between supply
voltage and chassis ground
Capacitive and inductive loads

Typ.
Min.
Max.
Typ.
Min.

Max.

DC 24V -20%/+25%
19.2 - 30Vdc
23 – 30Vdc
22.5Vdc
VIN – 1V

Back-up threshold jumper set to “22.5V fixed”
Back-up threshold jumper set to “VIN – 1V”
See also chapter 5.
Back-up threshold jumper set to “22.5V fixed”
22.5Vdc
Back-up threshold jumper set to “VIN – 1V”
VBUFFER + 1V
See also chapter 5.
Same as the transfer voltage for switching into buffer mode.
Generated by the buffer module.
200mVpp
Defined at 20Hz to 20MHz, 50Ohm
The ripple and noise voltage is defined by the power supply.
80mA
When capacitor is fully charged
400mA
During charging of the capacitors
600mA
During charging of the capacitors
1.9W
When capacitor is fully charged
40A
Electronically limited, buffering stops and capacitor gets discharged
below 17V. See Fig. 4-2.
60Vdc orContinuous, IEC 62477-1
42.4Vac
No limitation

1) Supply Voltage Range:
At voltages within the input voltage range, control functions such as LEDs, monitoring features, relay contacts, etc. are functioning
normally. Within the input voltage range the unit can either be in power supply mode or in buffer mode.
2) Normal Operating Voltage Range:
The normal operating voltage range describes the supply voltage, which supports the full functionality of the buffer module (including
charging) but without entering the buffer mode.
Fig. 4-1 Selection of an appropriate power supply

Fig. 4-2 Output characteristic in buffer mode,
22.5V fixed mode, typ.

Buffer Voltage

28V
Power
SupplyCurrent

Load
Current

24

22.5V

20
16
12

Internal
current
consumption

Current
consumption
for charging

Buffering stops
below 17V

8
40

Output Current

0

8

16

24

32

40

48

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

56 64A

5/20

UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

5. SELECTION OF THE BACK-UP THRESHOLD VOLTAGE
The buffer behavior can be selected with the back-up jumper selector between “Fixed Mode” and “Variable Mode”.
Fixed Mode: (Jumper in position „2-3“ or „22.5V fixed”)
If the supply output voltage falls below 22.5V, buffering starts and the supply voltage will be kept at this level.
This adjustment is recommended:- when power supplies other than the DIMENSION Q-series are used
- with back-feeding loads- when the buffer module is placed close to the load or- whenever in doubt.
Variable Mode: (Jumper in position „1-2“ or „VIN – 1V”)
Buffering starts if the supply voltage decreases by more than 1V. Buffering ends when supply voltage increases bymore than 1V
Voltage changes slower than 0.54V/s will be ignored if the voltage is above 22.5V. Below 22.5V buffering starts
immediately.
This adjustment is recommended for any application where 22.5V is too low for the application or when the buffer
module is placed close to the power supply.
The factory setting is fixed mode, A missing jumper means also fixed mode.

6. BUFFER TIME
The buffer time (sometimes also called autonomy time) is the maximum period of time for which the capacitor canmaintain the required output current. The buffer time mainly depends on the output current in buffer mode.
To increase the buffer time any given number of buffer modules can be connected in parallel.
Buffer time

Min.
Min.
Typ.
Typ.
Typ.

160ms
320ms
250ms
500ms
62s

Fig. 6-1 Buffer time, typ.

At 22.5V, 40A
At 22.5V, 20A
At 22.5V, 40A
At 22.5V, 20A
At 22.5V, 0.1A
Fig. 6-2 Buffer time for small buffer currents,
typ.

Buffer Current, typ.

Buffer Current, typ.

40A

2.0A

30

1.5

20

1.0

10

0.5
0

0
0 0.3 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3s
Buffer Time

3

6

9

12

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany15

18s

Buffer Time

6/20

UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

7. CHARGING TIME
Charging of the internal capacitors is indicated by the status LED, which is flashing with a slow frequency (1.25Hz).
Charging time

Min.
Max.
Min.
Max.

29s
50s
24s
40s

Initial charging 1)
Initial charging 1)
Re-charging 2)
Re-charging 2)

1) Initial charging is the first charge after voltage is applied to the buffer module.
2) Re-charging is the charging of the internal capacitors after voltage interruptions shorter than 2minutes.
Fig. 7-1 Charging time, re-charging

Charge100%

min.

typ. max.

80
60
40
Charging Time20
0

5 10 15 20 25 30 35 40 45s

8. OPERATING DIAGRAMS
Fig. 8-1 Operating diagram
V MainsFig. 8-2 Signal schematic
Hold-up Time Power Supplyt

V Buffer

Capacitor

6 +t

7 Active

Vout

Ready

Optocoupler high ohmic

ActiveOptocoupler high ohmictOptocoupler
low ohmic

8 Readyt

5,1V

Optocoupler low ohmic
LED

1.25Hz

10Hz

t

3mA

BufferModule9 InhibittCharging Mode

StandbyMode

Buffer Mode

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

7/20

UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

9. ACTIVE SIGNALThe signal “Active” (pin 7) is an opto-coupler output which is low ohmic while buffer capacitors are discharged.
Wiring scheme see Fig. 8-2, Fig. 25-1 and Fig. 25-2.
Signal voltage
Signal current
Voltage drop across opto-coupler
Leakage current
Isolation voltage

Max.
Max.

35Vdc
10mA
0.9V / 3VMax.
50µA
See chapter 21.

Voltage between pin 6 and 7
At 1mA / 5mA while opto-coupler is low ohmic
While opto-coupler is high ohmic

10. READY SIGNALThe signal “Ready” (pin 8) is an opto-coupler output which is low ohmic when buffer capacitors are fully charged.
Wiring scheme see Fig. 8-2, Fig. 25-1 and Fig. 25-2.
Signal voltage
Signal current
Voltage drop across opto-coupler
Leakage current
Isolation voltage

Max.
Max.

35Vdc
10mA
0.9V / 3VMax.
50µA
See chapter 21.

Voltage between pin 6 and 8
At 1mA / 5mA while opto-coupler is low ohmic
While opto-coupler is high ohmic

11. INHIBIT INPUT
Buffering can be disabled or interrupted with the inhibit input (pin 9). Therefore, pin 6 should be connected to thepositive pole of the terminal voltage or to the external control voltage and pin 9 must be connected to thecorresponding negative pole.
Inhibiting the unit also discharges the internal capacitors. Charging of the capacitor is not possible when the buffer
module is in inhibit mode.
Wiring scheme see Fig. 8-2, Fig. 25-1 and Fig. 25-2.
Signal voltage
Signal current
Inhibit mode

Max.
Max.

35Vdc (between pin 6 and pin 9)
4mA, current limited

Isolation voltage

See chapter 21.

The unit does not buffer (or stops buffering) if the voltage between pin 6 and pin 9 ishigher than 10V. Below 6V buffering will function again.

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

8/20

UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

12. EFFICIENCY AND POWER LOSSES
Efficiency

Typ.

>99%

Power losses

Typ.

1.9W

Power supply mode, 40A output current,
capacitors fully charged
Power supply mode, 0A output current,
capacitors fully charged

13. LIFETIME EXPECTANCY AND MTBF
Calculated lifetime expectancy*)
MTBF**) SN 29500, IEC 61709
MTBF**) MIL HDBK 217F

189 000h*)
536 000h*)
2 114 000h
3 937 000h
272 000h
433 000h
95 000h
143 000h

Stand-by mode, 40°C
Stand-by mode, 25°C
Stand-by mode, 40°C
Stand-by mode, 25°C
Stand-by mode, 40°C, Ground Benign GB40
Stand-by mode, 25°C Ground Benign GB25
Stand-by mode, 40°C, Ground Fixed GF40
Stand-by mode, 25°C Ground Fixed GF25

The calculated lifetime expectancy shown in the table indicates the minimum operating hours (service life) and is determined by the
lifetime expectancy of the built-in electrolytic capacitors. Lifetime expectancy is specified in operational hours and is calculated according
to the capacitor’s manufacturer specification. The manufacturer of the electrolytic capacitors only guarantees a maximum life of up to 15
years (131 400h). Any number exceeding this value is a calculated theoretical lifetime which can be used to compare devices.
**) MTBF stands for Mean Time Between Failure, which is calculated according to statistical device failures, and indicates reliability of adevice. It is the statistical representation of the likelihood of a unit to fail and does not necessarily represent the life of a product.
The MTBF figure is a statistical representation of the likelihood of a device to fail. A MTBF figure of e.g. 1 000 000h means thatstatistically one unit will fail every 100 hours if 10 000 units are installed in the field. However, it can not be determined if the failed unit
has been running for 50 000h or only for 100h.
*)Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

9/20

UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

14. FUNCTIONAL DIAGRAM
Fig. 14-1 Functional diagram
StatusLED

Buffer Capacitor
Charger &Inrush Limiter+
SupplyVoltage -ReversePolarity
Protection

Safety and
OverVoltage
Protection

BufferCapacitor
Shut-Down

Buffer Capacitor
Discharger

BufferCapacitor

ChassisGround6 (+)
9 Inhibit
Opto-coupler

Input / Output
Voltage Monitor
Back-up
Level
Selector+-

8 Ready

Ready Monitor

Opto-coupler+-

7 Active

Active Monitor

Opto-coupler

15. TERMINALS AND WIRING
The terminals are IP20 finger safe constructed and suitable for field and factory wiring.

Type
Solid wire
Stranded wire
American Wire Gauge
Max. wire diameter
Wire stripping length
Tightening torqueScrewdriver

Supply voltage
Screw terminals
Max. 16mm2Max. 10mm2Max. AWG 22-8
Max. 5.2mm (including ferrules)
Typ. 12mm / 0.5inch
2.3Nm / 20.5lb.inch
3.5mm or 5mm slotted or
cross-head No 2

Signals
Pluggable screw terminals
Max. 2.5mm2Max. 2.5mm2
AWG 22-14
2.25mm (including ferrules)
6mm / 0.25inch
0.4Nm / 3.5lb.inch
3mm slotted

Instructions:a) Use appropriate copper cables that are designed for minimum operating temperatures of:
60°C for ambient up to 45°C and
75°C for ambient up to 60°C and
90°C for ambient up to 70°C minimum.
b) Follow national installation codes and installation regulations!
c) Ensure that all strands of a stranded wire enter the terminal connection!
d) Unused terminal compartments should be securely tightened or closed.
e) Ferrules are allowed.

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

10/20

UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

16. FRONT SIDE AND USER ELEMENTS
Fig. 16-1 Front side

A Supply Voltage Terminals
Screw terminals, two negative pins.
+ Positive supply voltage terminal– Negative (return) supply voltage terminal
B Chassis Ground Terminal
To be connected on the top side of the housing with a ring-type
terminal (ring cable lug) which is suitable for a M4 screw.
Connection of the chassis to ground (earth) is optional and only
required for a view specific applications.
C Signal Connector
4-pole plug connector with screw termination comprises thefollowing signals:- “Active” signal, for details see chapter 9.
- “Ready” signal, for details see chapter 10- “Inhibit” input, for details see chapter 11
D Status LED
This green LED indicates that the following information:- OFF: Capacitors are discharged or supply voltage isbelow 22V.
- ON: Capacitors are fully charged- Slow flashing (1.25Hz):
Capacitors are getting charged.
- Fast flashing (10Hz):
Capacitors are getting discharged.
E Back-up Threshold Jumper
Option 1: Fixed mode (Jumper in position 2-3)
The unit switches to buffer mode as soon as the voltage falls below
22.5V.
Option 2: Variable mode (Jumper in position 1-2)
Unit switches to buffer mode when input voltage decreases by 1V.
Voltage changes slower than 0.54V/s will be ignored if the voltage isabove 22.5V. Below 22.5V buffering starts immediately.
For more details see chapter 5.

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

11/20

UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

17. EMCThe buffer module is suitable for applications in industrial environment as well as in residential, commercial and lightindustry environment.
EMC Immunity
for all operating modes
Electrostatic discharge

According to generic standards: EN 61000-6-1 and EN 61000-6-2

Electromagnetic RF field
Fast transients (Burst)

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

Surge voltage on supply
voltage terminals
Surge voltage on inhibit
input, active signal andready signal
Conducted disturbanceEN 61000-4-5

EN 61000-4-2

EN 61000-4-5

EN 61000-4-6

Contact discharge *)8kVCriterion A
Air discharge *)15kVCriterion A
80MHz-2.7GHz
10V/m
Criterion A
Input lines
2kV
Criterion A
Output lines
2kV
Criterion A
Signals lines pin 6, 7, 8, 9 **)2kV
Criterion A+0.5kV
Criterion A+ / -  chassis ground
1kV
Criterion A
Not applicable since length of signal wire specified shorter than30m.
0.15-80MHz

10V

Criterion A*) Chassis ground connection earthed (grounded)**) Tested with coupling clamp
Criterions:
A: Buffer module shows normal operation behavior within the defined limits.

According to generic standards: EN 61000-6-3 and EN 61000-6-4
EMC Emission
for standby- and charging
mode
Conducted emission,
Limits for DC power ports acc. EN 61000-6-3
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1
supply voltage
fulfilled
Radiated emission
EN 55011, EN 55032
Class B
This device complies with FCC Part 15 rules.
Operation is subjected to 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.

Switching Frequency

The buffer module has two converters with variable frequencies included.
Charging converter at 24V input (is only active during charging)
6 to 610kHz
The frequency depends on the state of charge of the capacitors
Buffer converter at buffering at 22.5V
10 to 70kHz
The frequency depends on the output current. The values are
between 10% and 100% of the nominal buffer current

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

12/20

UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

18. ENVIRONMENT
Operational temperature *)Storage temperature
Humidity **)Vibration sinusoidal
Vibration random
Shock
AltitudeOver-voltage category
Degree of pollution-25°C to +70°C (-13°F to 158°F)-40 to +70°C (-40°F to 158°F)
5 to 95% r.H.
2-12.5Hz: ±1.6mm; 12.5-500Hz: 1g
2 hours / axis
0.5m²(s³)
2 hours / axis
15g 6ms, 10g 11ms
3 bumps / direction, 18 bumps in total
0 to 6000m (0 to 20 000ft)
III
II
2

For storage and transportation
IEC 60068-2-30
IEC 60068-2-6
IEC 60068-2-64
IEC 60068-2-27
Approvals apply only up to 2000m
IEC 62103, EN 62477-1
IEC 62103, EN 62477-1, above 2000m altitude
IEC 62103, EN 62477-1, not conductive*)

Operational temperature is the same as the ambient or surrounding temperature and is defined as the air temperature 2cm below theunit.
**) Do not energize while condensation is present

19. PROTECTION FEATURES
Electrical protection
Over-voltage protection in
buffer mode
Degree of protection
Penetration protection
Reverse polarity protection
Input overvoltage protection
Internal input fuse

Electronically protected against overload, no-load and short-circuits
Typ. 32Vdc
In case of an internal buffer module defect, aMax. 35Vdc
redundant circuit limits the maximum output voltage.
Buffering stops and automatically attempts to restart.
IP 20
EN/IEC 60529> 3.5mm
E.g. screws, small parts
Yes
Max. -35V
Yes
Max. 35V, no harm or defect of the unit
Not included

20. SAFETY FEATURESClass of protection

Isolation resistance

Chassis ground terminal
resistanceNo classificationaccording to IEC 61140 or
IEC 60950-1 possible> 500MOhm> 500MOhm> 500MOhm< 0.1Ohm

Install the buffer module according to Class III rules

Supply voltage to signal port
Supply voltage to housing
Signal port to housing
Between housing and chassis ground terminal

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

13/20

UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

21. DIELECTRIC STRENGTH
The signal port (active and ready signal and inhibit input) is floating and separated from the supply voltage.
Type and factory tests are conducted by the manufacturer. Field tests may be conducted in the field using theappropriate test equipment which applies the voltage with a slow ramp (2s up and 2s down). Connect all poles of thepower port terminals together as well as all poles of the signal port before conducting the test. When testing, set the
cut-off current settings to the value in the table below. The following isolation tests were performed:
Type test

60s

A
500VacFactory test

5s

500Vac

500Vac

500VacField test

5s

500Vac

500Vac

500Vac

> 1mA

> 1mA

> 1mA

Fig. 21-1 Dielectric strength

SupplyVoltage

B

A

ChassisC

Cut-off current setting

B
500VacC
500VacActive and Ready Signal
Inhibit Input

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

14/20

UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

22. APPROVALS AND FULFILLED STANDARD
IEC 61010-2-201

UL 61010-2-201

IEC 60950-1

UL 60950-1

Corrosion
IEC 60068-2-60
Method 4

Corrosion
G3-ISA-71.04

VDMA 24364

CB Scheme Certificate
IEC 61010-2-201 Electrical Equipment for Measurement,
Control and Laboratory Use - Particular requirements forcontrol equipment
UL Certificate
Listed equipment for category NMTR Electrical Equipment
for Measurement, Control and Laboratory Use - Particularrequirements for control equipment
Applicable for US and Canada
E-File: E198865
CB Scheme Certificate
General safety requirements for Information Technology
Equipment (ITE)UL Certificate
Recognized component for category QQGQ - Information
Technology Equipment (ITE)
Applicable for US and Canada
E-File: E137006
Manufacturer's Declaration (Online Document)
IEC 60068-2-60 - 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 atleast 10 years
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 atleast 10 years.
Paint Wetting Impairment Substances Test (or LABS-Test)
Tested for Zone 2 and test class C1 according to VDMA 24364C1-L/W for solvents and water-based paints

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

15/20

UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

23. REGULATORY COMPLIANCE
EU Declaration ofConformity

REACH Directive

EAC TR Registration

The CE mark indicates conformance with the- EMC directive- Low-voltage directive (LVD)- RoHS directive
Manufacturer's Statement
EU-Directive regarding the Registration, Evaluation, Authorisation
and Restriction of Chemicals
Registration for the Eurasian Customs Union market(Russia, Kazakhstan, Belarus)

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

16/20

UF40.241
UF-Series

24V, 40A, 160MS, BUFFER MODULE

24. PHYSICAL DIMENSIONS AND WEIGHT
Width
HeightDepth

WeightDIN-rail
Housing material
Installation clearances

64mm
2.13’’
124mm 4.88’’142mm 5.59’’
The DIN-rail height must be added to the unit depth to calculate the total required
installation depth.
1040g / 2.3lb
Use 35mm DIN-rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
Body: Aluminium alloy
Cover: Zinc-plated steel
See chapter 2

Fig. 23-1 Front viewFig. 23-2 Side view

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

17/20

UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

25. ACCESSORIES

25.1. ZM2.WALL - WALL MOUNTING BRACKETThis bracket is used to mount the buffer module on a wall without utilizing a DIN-Rail.
To mount a unit on a wall or a panel, the two zinc-plated steel brackets have to be installed on
the side of the unit.

Fig. 24-1 Wall mounting

Fig. 24-2 Mounting Dimensions - Wall mounting bracket

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

18/20

UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

25.2. ZM14.SIDE - SIDE MOUNTING BRACKETThis bracket is used to mount the buffer module sideways with or without utilizing a DIN-Rail.
The two aluminum brackets and the black plastic slider of the unit have to be detached, so thatthe steel brackets can be mounted.
For sideway DIN-rail mounting, the removed aluminum brackets and the black plastic slider need
to be mounted on the steel bracket.

Fig. 24-3
Side mounting without DINrail brackets

Fig. 24-4
Side mounting with DIN-railbrackets

Fig. 24-5
Mounting Dimensions
Side mounting bracket

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

19/20

UF40.241
24V, 40A, 160MS, BUFFER MODULE

UF-Series

26. WIRING DIAGRAMS

9 8 7 6Power
SupplyUF40
Buffer Module

Input

L N PE

9 8 7 6-

InhibitInput

L N PE

Load

StatusBack-upThreshold

External
Voltage Source

UF40
Buffer Module-

OutputDC 24V

Ready
Relay, lamp or signal

PowerSupplyInhibit

Load

StatusBack-upThreshold

+ -

-

+ -

Inhibit
Ready
Active
+

+ + -

Ready
Relay, lamp or signal+ -OutputDC 24V

ActiveRelay, lamp or signal-+ -Inhibit
Ready
Active++ + -Fig. 25-2 Signals supplied from an external voltage source

ActiveRelay, lamp or signal

Fig. 25-1 General wiring diagram

+

L
N
PE

L
N
PE

+ + -

L
N
PE

-

+ -

-

+ -

-

+ + -

-

StatusBack-upThresholdStatusBack-upThreshold+ -OutputDC 24VPower
SupplyUF40
Buffer Module

UF40
Buffer Module

Unbuffered
Load

Power
SupplyInput

Inhibit
Ready
Active+Load

OutputDC 24V

Inhibit
Ready
Active++ -Fig. 25-4 Decoupling of buffered branches

L N PE

9 8 7 69 8 7 6

+ - + Input Input
1
2

YR40.241

Redundancy
ModuleInput

L N PE

Output

+ -

+ -

-

StatusBack-upThreshold

UF40
Buffer Module+ -Buffered
Load

Inhibit
Ready
Active+Fig. 25-3 Paralleling of buffer modules

9 8 7 6

L
N
PE

Jul. 2020 / Rev. 1.1 DS-UF40.241-EN
All parameters are specified at 24V, 40A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0Germany

20/20