UF20.241
24V, 20A, 200MS, BUFFER MODULE
UF-Series
BUFFER MODULE
Buffering with electrolytic capacitors instead of lead
acid batteries
Buffering of 24V loads
Minimum hold-up time 0.2s at 20A, longer hold-up time
at lower loads
Clear status indication by status LED and signaling
terminals
Quick-connect spring-clamp terminals
3 Years warranty
GENERAL DESCRIPTION
SHORT-FORM DATA
The UF20 buffer module is a supplementary device for
regulated DC 24V power supplies, which can be used for
various 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 the
current rating of the power supply.
Supply voltage
Required voltage to
charge 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
Weight
ORDER NUMBERS
DC 24V -20%/+25% 19.2-30Vdc
23Vdc
22.5V / VIN-1V
Selectable
22.5V / VIN-1V
20A
Typ. 18s
Typ. 80mA
Max. 600mA
1.9W
Min. 200ms
Min. 430ms
Typ. 310ms
Typ. 670ms
Typ. 43s
-25°C to +70°C
64x124x102mm
740g / 1.63lb
Selectable
Stand-by mode
During charging
Stand-by mode
At 22.5V, 20A
At 22.5V, 10A
At 22.5V, 20A
At 22.5V, 10A
At 22.5V, 0.1A
Operational
WxHxD
MARKINGS
Buffer Module UF20.241
Accessory
ZM1.WALL
ZM14.SIDE
Panel/ wall-mount bracket
Side-mount bracket
IND. CONT. EQ.
UL 508
UL 60950-1
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
EMC
1/18
UF20.241
24V, 20A, 200MS, BUFFER MODULE
UF-Series
INDEX
Page
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
Intended Use .......................................................3
Installation Notes ................................................3
Functional Description ........................................4
Electrical Ratings .................................................5
Selection of the Back-up Threshold Voltage .....6
Buffer Time ..........................................................6
Charging Time .....................................................7
Operating Diagrams............................................7
Active Signal ........................................................8
Ready Signal ........................................................8
Inhibit Input.........................................................8
Efficiency and Power Losses................................9
Lifetime Expectancy and MTBF...........................9
Functional Diagram...........................................10
Page
15. Terminals and Wiring ....................................... 10
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 .......................................................... 14
23. Physical Dimensions and Weight ..................... 15
24. Accessories ........................................................ 16
24.1. ZM1.WALL - Wall mounting bracket ....... 16
24.2. ZM14.SIDE - Side Mounting Bracket ........ 17
25. Wiring Diagrams............................................... 18
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 our
knowledge 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 ABREVIATIONS
Power 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 and
the 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 24V
A figure displayed with the AC or DC before the value represents a nominal voltage with
standard 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.
should
A key word indicating flexibility of choice with a strongly preferred implementation.
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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Germany
2/18
UF20.241
UF-Series
24V, 20A, 200MS, BUFFER MODULE
1. INTENDED USE
This device is designed for installation in an enclosure. Use an appropriate enclosure which protects against
mechanical, electrical and fire hazards.
This device is intended for professional use in areas such as in industrial control, office, communication, and
instrumentation equipment.
Do not use this device in equipment or systems where malfunction may cause severe personal injury or threaten
human life.
2. INSTALLATION NOTES
This device may only be installed and put into operation by qualified personnel.
This device does not contain serviceable parts or fuses.
If damage or malfunction should occur during installation or operation, immediately turn power off and send unit to
the factory for inspection.
The unit must be powered from a SELV source (according to IEC 60950-1), PELV source (according to IEC 62477-1) or an
Isolated Secondary Circuit (according to UL 508) power source.
Use DIN-rails according to EN 60715 with a height of 7.5 or 15mm.
Mounting orientation must be power terminals on top of the unit.
Do not obstruct air flow as the unit is convection cooled. Ventilation grid must be kept free of any obstructions.
Signal lines (ready, active and inhibit) must be shorter than 30m.
Use an appropriately sized power supply, which can deliver the additional required internal current consumption
(including the charging current) specified as input current in the table of chapter 4 and Fig. 4-1.
The following installation clearances must be maintained:
- Left / right: 0mm
- On top of the unit: 40mm
- On bottom of the unit: 20mm
Agency approvals apply only for altitudes up to 2000m.
Maximum surrounding air temperature: +70°C / +158°F.
Caution for Canada: For use in a controlled environment according to CSA 22.2 No 107.1-01.
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.
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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3/18
UF20.241
24V, 20A, 200MS, BUFFER MODULE
UF-Series
3. FUNCTIONAL DESCRIPTION
Working principle
When the power supply provides sufficient voltage, the buffer module stores energy in
the integrated electrolytic capacitors. In case of a voltage dip or loss, this energy is
released 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 are
completely bridged by the buffer unit. This increases the reliability of the system as a
whole.
optional
-
AC
DC
Buffer Module
Power
Supply
AC
Buffer
Module
Load
+
-
DC
Transfer Threshold
Load
+
-
+
L PE
+
N
Buffer Module
Fig. 3-2 Transfer behavior
Power
Supply
Output
Buffer
Module
Discharge
DC
Easy to handle, expandable and maintenance-free
The buffer module does not require any control wiring. It can be added parallel to the
load circuit at any given point. Buffer modules can be connected in parallel to increase
the output ampacity or the hold-up time.
Power
Supply
Storage
AC
Extended hold-up time
Once mains power fails or is switched off, the buffer unit will continue to provide the
load current for a defined period of time. Process data can be saved and processes can be
terminated before the DC power switches off. Controlled restarts are subsequently
possible.
Fig. 3-1 Typical wiring diagram
Charge
DC
-
t
Supply
Voltage
Power
Supply
Mode
Buffer
Mode
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
Power
Supply
Mode t
4/18
UF20.241
24V, 20A, 200MS, 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 switching
from 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.
200mVpp
Generated by the buffer module.
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
20A
Electronically limited, buffering stops and capacitor gets discharged
below 17V. See Fig. 4-2.
60Vdc or
Continuous, 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
Supply
Current
Load
Current
24
22.5V
20
16
12
Internal
current
consumption
Current
consumption
for charging
Buffering stops
below 17V
8
4
0
Output Current
0
4
8
12
16
20
24
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
28 32A
5/18
UF20.241
24V, 20A, 200MS, 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 by
more 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 can
maintain 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.
200ms
430ms
310ms
670ms
43s
Fig. 6-1 Buffer time, typ.
At 22.5V, 20A
At 22.5V, 10A
At 22.5V, 20A
At 22.5V, 10A
At 22.5V, 0.1A
Fig. 6-2 Buffer time for small buffer currents,
typ.
Buffer Current, typ.
Buffer Current, typ.
20A
2.0A
15
1.5
10
1.0
5
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
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
15
18s
Buffer Time
6/18
UF20.241
24V, 20A, 200MS, 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.
20s
29s
15s
21s
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
Charge
min.
100%
max.
80
60
40
Charging Time
20
0
5
10
15
20
25
30s
8. OPERATING DIAGRAMS
Fig. 8-1 Operating diagram
V
V
Fig. 8-2 Signal schematic
Hold-up Time Power Supply
Mains
t
Buffer
Capacitor
6 +
t
7 Active
Vout
Ready
Optocoupler high ohmic
Active
Optocoupler high ohmic
t
Optocoupler
low ohmic
8 Ready
t
5,1V
Optocoupler low ohmic
LED
1.25Hz
10Hz
t
3mA
UF20
9 Inhibit
t
Charging Mode
Standby
Mode
Buffer Mode
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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UF20.241
24V, 20A, 200MS, BUFFER MODULE
UF-Series
9. ACTIVE SIGNAL
The 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 / 3V
Max.
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 SIGNAL
The 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 / 3V
Max.
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 the
positive pole of the terminal voltage or to the external control voltage and pin 9 must be connected to the
corresponding 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 is
higher than 10V. Below 6V buffering will function again.
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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UF20.241
24V, 20A, 200MS, BUFFER MODULE
UF-Series
12. EFFICIENCY AND POWER LOSSES
Efficiency
Typ.
>99%
Power losses
Typ.
1.9W
Power supply mode, 20A 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
166 000h*)
469 000h*)
2 327 000h
4 219 000h
398 000h
624 000h
132 000h
195 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 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.
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 that
statistically 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.
*)
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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UF20.241
24V, 20A, 200MS, BUFFER MODULE
UF-Series
14. FUNCTIONAL DIAGRAM
Fig. 14-1 Functional diagram
+
Supply +
Voltage
-
Status
LED
Buffer Capacitor
Charger &
Inrush Limiter
ReversePolarity
Protection
Safety and
OverVoltage
Protection
Buffer Capacitor
Discharger
Buffer
Capacitor
Shut-Down
Buffer
Capacitor
Chassis
Ground
6 (+)
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 torque
Screwdriver
Supply voltage, chassis ground
Quick-connect spring-clamp terminals
Max. 6mm2
Max. 4mm2
Max. AWG 20-10
Max. 2.8mm (including ferrules)
Typ. 10mm / 0.4inch
Not applicable
Not applicable
Signals
Pluggable screw terminals
Max. 2.5mm2
Max. 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.
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
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10/18
UF20.241
24V, 20A, 200MS, BUFFER MODULE
UF-Series
16. FRONT SIDE AND USER ELEMENTS
Fig. 16-1 Front side
A Supply Voltage Terminals
Quick-connect spring-clamp terminals, two per polarity
+ Positive supply voltage terminal
– Negative (return) supply voltage terminal
B Chassis Ground Terminal
Quick-connect spring-clamp terminals
Connection of the chassis to ground (earth) is optional
and only required for a few specific applications.
C Signal Connector
4-pole plug connector with screw termination comprises
the following 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 is
below 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 is above 22.5V. Below 22.5V buffering starts
immediately.
For more details see chapter 5.
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
11/18
UF20.241
24V, 20A, 200MS, BUFFER MODULE
UF-Series
17. EMC
The buffer module is suitable for applications in industrial environment as well as in residential, commercial and light
industry 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 and
ready signal
Conducted disturbance
EN 61000-4-5
EN 61000-4-2
EN 61000-4-5
EN 61000-4-6
Contact discharge *)
8kV
Criterion A
Air discharge *)
15kV
Criterion 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 than
30m.
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,
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1
Limits for DC power ports acc. EN 61000-6-3
supply voltage
fulfilled
Radiated emission
EN 55011, EN 55022
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) this
device must accept any interference received, including interference that may cause undesired operation.
Switching Frequency
The buffer module has two converters with variable frequencies included.
6 to 610kHz
Charging converter at 24V input (is only active during charging)
The frequency depends on the state of charge of the capacitors
10 to 70kHz
Buffer converter at buffering at 22.5V
The frequency depends on the output current. The values are
between 10% and 100% of the nominal buffer current
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
12/18
UF20.241
24V, 20A, 200MS, BUFFER MODULE
UF-Series
18. ENVIRONMENT
Operational temperature *)
Storage temperature
Humidity **)
Vibration sinusoidal
Vibration random
Shock
Altitude
Over-voltage category
Degree of pollution
LABS compatibility
-25°C to +70°C (-13°F to 158°F)
-40 to +70°C (-40°F to 158°F)
For storage and transportation
5 to 95% r.H.
IEC 60068-2-30
2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g
IEC 60068-2-6
2 hours / axis
0.5m²(s³)
IEC 60068-2-64
2 hours / axis
30g 6ms, 20g 11ms
IEC 60068-2-27
3 bumps / direction, 18 bumps in total
0 to 6000m (0 to 20 000ft)
Approvals apply only up to 2000m
III
IEC 62103, EN 62477-1
II
IEC 62103, EN 62477-1, above 2000m altitude
2
IEC 62103, EN 62477-1, not conductive
The unit does not release any silicone or other LABS-critical substances and is suitable for
use in paint shops.
*)
Operational temperature is the same as the ambient or surrounding temperature and is defined as the air temperature 2cm below the
unit.
**) 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, a
redundant circuit limits the maximum output voltage.
Max. 35Vdc
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 FEATURES
Class of protection
Isolation resistance
Chassis ground terminal
resistance
No classification
according 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
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
13/18
UF20.241
24V, 20A, 200MS, 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 the
appropriate test equipment which applies the voltage with a slow ramp (2s up and 2s down). Connect all poles of the
power 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
500Vac
Factory test
5s
500Vac
500Vac
500Vac
Field test
5s
500Vac
500Vac
500Vac
> 1mA
> 1mA
> 1mA
Fig. 21-1 Dielectric strength
Supply
Voltage
A
B
Chassis
C
Cut-off current setting
B
500Vac
C
500Vac
Active and Ready Signal
Inhibit Input
22. APPROVALS
EU Declaration of Conformity
The CE mark indicates conformance with the EMC directive
IEC 60950-1
2nd Edition
CB Scheme,
Information Technology Equipment
UL 60950-1
2nd Edition
Recognized for use as Information Technology Equipment,
U.S.A. (UL 60950-1) and Canada (C22.2 No. 60950-1);
E-File: E137006
Listed for use as Industrial Control Equipment;
U.S.A. (UL 508) and Canada (C22.2 No. 107-1-01);
E-File: E198865
UL 508
IND. CONT. EQ.
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
14/18
UF20.241
UF-Series
24V, 20A, 200MS, BUFFER MODULE
23. PHYSICAL DIMENSIONS AND WEIGHT
Width
Height
Depth
Weight
DIN-rail
Housing material
Installation clearances
64mm
2.13’’
124mm 4.88’’
102mm 4.02’’
The DIN-rail height must be added to the unit depth to calculate the total required
installation depth.
740g / 1.63lb
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 view
Fig. 23-2 Side view
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
15/18
UF20.241
24V, 20A, 200MS, BUFFER MODULE
UF-Series
24. ACCESSORIES
24.1. ZM1.WALL - WALL MOUNTING BRACKET
This bracket is used to mount the buffer module on a wall without utilizing a DIN-Rail.
The two aluminum brackets and the black plastic slider of the unit have to be detached, so that
the steel brackets can be mounted.
Fig. 24-1 Wall mounting
Fig. 24-2 Mounting Dimensions - Wall mounting bracket
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
16/18
UF20.241
24V, 20A, 200MS, BUFFER MODULE
UF-Series
24.2. ZM14.SIDE - SIDE MOUNTING BRACKET
This 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 that
the 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-rail
brackets
Fig. 24-5
Mounting Dimensions
Side mounting bracket
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
Germany
17/18
UF20.241
24V, 20A, 200MS, BUFFER MODULE
UF-Series
25. WIRING DIAGRAMS
optional
External
Voltage Source
Inhibit
Ready
Relay, lamp or signal
Active
Relay, lamp or signal
7 Active
optional
--
+- +-
IN 1 IN 2
Adj
DC-OK
Overload
UF20
Back-up
Buffer Threshold
Module
+Buffered
Load
6 +
OUT
+ -
optional
Oct. 2016 / Rev. 2.0 DS-UF20.241-EN
All parameters are specified at 24V, 20A, 25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone +49 89 9278 0
++
7 Active
YR2
Redundancy
Module
L N PE
L
N
PE
--
Status
Power
Supply
6 +
7 Active
UF20
Back-up
Buffer Threshold
Module
+Unbuffered
Load
8 Ready
++
++
Status
9 Inhibit
--
9 Inhibit
6 +
7 Active
L N PE
8 Ready
UF20
Back-up
Buffer Threshold
Module
Power
Supply
L
N
PE
++
Status
+
Fig. 25-4 Decoupling of buffered branches
8 Ready
--
Adj
DC-OK
Overload
9 Inhibit
Load
--
UF20
Back-up
Buffer Threshold
Module
L N PE
-
++
Status
Power
Supply
L
N
PE
optional
++
--
6 +
Inhibit
Load
Fig. 25-3 Paralleling of buffer modules
+-
--
Adj
DC-OK
Overload
+-
9 Inhibit
6 +
9 Inhibit
L N PE
L
N
PE
++
UF20
Back-up
Buffer Threshold
Module
Power
Supply
7 Active
Load
++
Status
Ready
Relay, lamp or signal
--
Active
Relay, lamp or signal
--
Adj
DC-OK
Overload
8 Ready
++
+-
Fig. 25-2 Signals supplied from an external voltage source
8 Ready
Fig. 25-1 General wiring diagram
Germany
18/18
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