PIRD20.241
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULEPIANO-Series

REDUNDANCY MODULE










Cost effective solution to build redundant systems
Dual input with single output
Two diodes (common cathode)DC 12-28V ±25% wide-range input
Full power between -40°C and +55°C
Width only 39mm
Large screw terminals
Easy wiring:
Distribution terminal for negative pole included
3 year warranty

PRODUCT DESCRIPTIONSHORT-FORM DATAThe PIRD20.241 is a redundancy module, which can beused to build 1+1 and N+1 redundant systems. It isequipped with two input channels, which can beconnected to power supplies with up to 10A output
current and one output, which can carry nominal
currents up to 20A. The module is suitable for power
supplies with constant current overload behavior as wellas any kind of “hiccup” overload behavior.

Input voltage
Input voltage
range
Input current

The PIRD20.241 is the perfect solution to use in a
redundant system, if the power supply itself is equippedwith a DC-OK signal.
Another application for this redundancy module is toseparate sensitive loads from non-sensitive loads. Thisavoids the distortion of the power quality for thesensitive loads which can cause controller failures.

ORDER NUMBER
Redundancy Module

Output current

DC 12-28V
9-35Vdc±25%

2x 0-10A
2x 0-6.25A
0-20A
0-12.5A
26A

ambient < +55°C
ambient < +70°C
ambient < +55°C
ambient < +70°C
at cont. overload/
short circuit
input: 2x5A
input: 2x10A
at no load
input: 2x5A
input: 2x10A
operational+55 to +70°C
WxHxD

Input to output
voltage drop
Power losses

typ. 0.46V
typ. 0.56V
0W
typ. 4.6W
typ. 11.2W
Temperature range -40°C to +70°C
Derating
0.5A/°C
Dimensions
39x124x124mm
Weight280g / 0.62lb

MAIN APPROVALSPIRD20.241

For details and the complete approval list, see chapter 14.

UL 508

UL 60950-1

ATEX

IECEx

Class I Div 2

Jul. 2021 / Rev. 2.2 DS-PIRD20.241
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0Germany

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DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULEPIANO-Series

INDEX
Page
1. Intended Use .......................................................3
2. Installation Instructions ......................................3
3. Input and Output Characteristics .......................5
4. Power Losses ........................................................6
5. Lifetime Expectancy and MTBF...........................6
6. Terminals and Wiring ..........................................7
7. Functional Diagram .............................................7
8. Front Side and User Elements .............................8
9. EMC ......................................................................9
10. Environment ......................................................10
11. Protection Features ...........................................11
12. Safety Features ..................................................11
13. Dielectric Strength ............................................11Page
14. Approved, Fulfilled or Tested Standards ......... 12
15. Regulatory Product Compliance ...................... 13
16. Physical Dimensions and Weight ..................... 14
17. Application Notes ............................................. 15
17.1. Using Only One Input Instead of BothChannels ............................................................... 15
17.2. Recommendations for Redundancy......... 15
17.3. Inductive and Capacitive Loads................ 16
17.4. Use in a Tightly Sealed Enclosure ............ 16
17.5. Example: Redundancy for Controls ......... 16
17.6. Example: 1+1 Redundancy up to 10A ...... 1717.7. Example: 1+1 Redundancy up to 20A ...... 17

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.

TERMINOLOGY AND ABREVIATIONS
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 preferenceshall

A key word indicating a mandatory requirement

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

1+1 Redundancy

Use of two identical power supplies in parallel to provide continued operation following most
failures in a single power supply. The two
N+1
1+1
Redundancy
Redundancy
power supply outputs should be isolated
AC
AC
AC
AC
AC
AC
AC
AC
from each other by utilizing diodes orother switching arrangements.
DC
DC
DC
DC
DC
DC
DC
DC
E.g. two 10A power supplies are needed toachieve a 10A redundant system.
IN 1 IN 2
IN 1 IN 2
IN 1 IN 2
IN 1 IN 2

N+1 Redundancy

Use of three or more identical power
supplies in parallel, which are allowed to
OUT
OUT
OUT
OUT
be connected in parallel for higher output
currents, to provide continued operation
Load
Load
following most failures in a single power
supply. All power supply outputs should be
isolated from each other by utilizing diodes or other switching arrangements. E.g.: To achieve
a 40A redundant system, five 10A power supplies are needed in a N+1 redundant system.
Ensure that the utilized power supplies are allowed to be connected in parallel to increase theoutput power.

Jul. 2021 / Rev. 2.2 DS-PIRD20.241
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0Germany+

A figure displayed with the AC or DC before the value represents a nominal voltage withstandard tolerances (usually ±15%) included.
E.g.: DC 12V describes a 12V battery disregarding whether it is full (13.7V) or flat (10V)+

DC 24V

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DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULEPIANO-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.
The redundancy module can be used with any type of power supply as long as the maximum output current ratings
are not exceeded. It is suitable for power supplies with continuous overload current as well as any kind of intermittent(Hiccup) overload behavior.
If this device is used in a manner outside of its specification, the protection provided by the device may be impaired.

2. INSTALLATION INSTRUCTIONSWARNING

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.
Install the device in an enclosure providing protection against electrical, mechanical and fire hazards.
Do not ground or earth the positive output pole which could prevent redundancy in case of a ground failure. Groundthe negative output pole, when needed.
Use only power supplies with a negligible output ripple voltage in the low frequency range between 50Hz and 10kHz
when used in marine applications according to the GL regulations.
Install the device onto a DIN rail according to EN 60715 with the input terminals on the top of the device.
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.
Unused screw terminals should be securely tightened.
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 input must be powered from a PELV or SELV source or an “Isolated Secondary Circuit” in order to maintain a SELVor PELV output.
Do not energize with wrong input polarity. Device might get damaged.
The device is designed as “Class of Protection III” equipment according to IEC 61140.
The device is designed for convection cooling and does not require an external fan. Do not obstruct airflow and do notcover ventilation grid!
The device is designed for altitudes up to 5000m (16400ft). Above 2000m (6560ft) a reduction in output current isrequired.
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.
Jul. 2021 / Rev. 2.2 DS-PIRD20.241
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0Germany

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DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULEPIANO-Series

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 (Zone 2)
environments.
Hazardous Location classification: ATEX: EPS 11 ATEX 1 312 X, II 3G EX ec IIC T4 Gc.
WARNING EXPLOSION HAZARDS!
Substitution of components may impair suitability for this environment.
Do not disconnect the device 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. The device is suitable for use in Class I Division 2 Groups A, B, C, D locations.

Jul. 2021 / Rev. 2.2 DS-PIRD20.241
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0Germany

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PIRD20.241
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULEPIANO-Series

3. INPUT AND OUTPUT CHARACTERISTICS
Number of inputs
Number of outputs
Input voltage
Input voltage range
Voltage drop, input to output

nom.
typ.
typ.
nom.
nom.
max.
nom.
nom.
max.
max.
max.

Input current
Peak input current
Output current

Reverse current
Reverse voltage*)

2
1
DC 12-28V ±25%
9-35Vdc
0.46V
0.56V
2x 0-10A
2x 10-16A
1000A
20A
20-32A
26A *)
4mA
45Vdc

at 2x5A, see Fig. 3-1
at 2x10A, see Fig. 3-1
continuousfor 5 seconds
for maximal 10ms per input
continuousfor 5 seconds
at continuous overload or short circuit
per input, -40°C to +70°C
voltage applied to the output, continuously allowed

Ensure that the continuous output current does not exceed 26A. Check the short-circuit current of the power sources and if the powersource can deliver more than 26A together, use an appropriate fuse on the output.
Fig. 3-1 Input to output voltage drop
Voltage Drop, typ.

PIC120.241x or
PIC240.241x
24V, 5A or+
24V, 10A

600mV
500mV
400mV

A

B

-

A... 25°C
B... 60°C

300mV
200mV

Input, Output Current

100mV
Output: 0
Input: 0

Fig. 3-2 Test setup for voltage drop measurements

5A
2x2.5A

10A
2x5A

15A
20A
2x7.5A 2x10A

PIC120.241x or
PIC240.241x
24V, 5A or+
24V, 10A

I1 = I2

I1
AV U1

OutputPIRD20.241
Input 1IOUT
A
OutputVariable
Load,
0-20A

UOUT VI2
A
V U2

Input 2

Voltage Drop = U1 - UOUT

U1 = U2

Jul. 2021 / Rev. 2.2 DS-PIRD20.241
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0Germany

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PIRD20.241
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULEPIANO-Series

4. POWER LOSSES
0W
4.6W
11.2W

Power losses
typ.
typ.

at no load (stand-by)
at 24V and 2x5A input current
at 24V and 2x10A input current

Fig. 4-1 Power losses at 25°C
Power Losses, typ.

12W
10
8
6
4
2

Output Current

0
0

5

10

15

20A

5. LIFETIME EXPECTANCY AND MTBF
The redundancy module has two input channels which are completely independent from each other. The dual input
redundancy module can be considered as two single redundancy modules combined together in one housing. The only
common point is the circuit trace that ties the two separate circuits together at the output.
The MTBF figures below are for the entire dual input module. If the MTBF number of only one path is needed, simply
double the value from the table.
Input / output
current conditions

Lifetime expectancy *)MTBF **) SN 29500, IEC 61709
MTBF **) MIL HDBK 217F

min.
min.

N+1
Redundancy
Input: 2x10A
Output: 20A
113 000h
320 000h*)
7 837 000h
19 408 000h
1 774 000h
2 709 000h
3 675 000h
5 620 000h

1+1
Redundancy
Input: 2x5A
Output: 10A
309 000h*)
874 000h*)
20 310 000h
46 382 000h
1 817 000h
2 782 000h
3 707 000h
5 674 000h

at 24V and 40°C
at 24V and 25°C
at 24V 40°C
at 24V 25°C
at 24Vand 40°C (Ground Fixed GF40)
at 24Vand 25°C (Ground Fixed GF25)
at 24Vand 40°C (Ground Benign GB40)
at 24Vand 25°C (Ground Benign GB25)

The 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 thecapacitor’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. 2021 / Rev. 2.2 DS-PIRD20.241
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0Germany

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DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULEPIANO-Series

6. TERMINALS AND WIRING
The terminals are IP20 finger safe constructed and suitable for field- and factory wiring.
screw terminals
max. 6mm2
max. 4mm2
AWG20-10
2.8mm (including ferrules)
7mm / 0.28inch
3.5mm slotted or cross-head No 2
1Nm, 9lb.in

Type
Solid wire
Stranded wire
American Wire Gauge
Max. wire diameter
Wire stripping length
Screwdriver
Recommended tightening torqueInstructions:a) Use appropriate copper cables that are designed for minimum operating temperatures of:
75°C for ambient up to 55°C minimum 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.
e) Ferrules are allowed.

7. FUNCTIONAL DIAGRAM
Fig. 7-1 Functional diagram+
Input 1+
Input 2-

Surge
Protection

Surge
Protection+
Surge
Protection

Output+-Jul. 2021 / Rev. 2.2 DS-PIRD20.241
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0Germany

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PIRD20.241
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULEPIANO-Series

8. FRONT SIDE AND USER ELEMENTS
Fig. 8-1 Front sideA

Output terminals
Two identical (+) poles.

B

Input terminals for input 1 and input 2

Jul. 2021 / Rev. 2.2 DS-PIRD20.241
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0Germany

8/17

PIRD20.241
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULEPIANO-Series

9. EMCThe redundancy module is suitable for applications in industrial environment as well as in residential, commercial andlight industry environment without any restrictions.
EMC Immunity
Electrostatic discharge

Electromagnetic RF field
Fast transients (Burst)
Surge voltage on input lines
Surge voltage on output lines
Conducted disturbance on
input lines
Conducted disturbance on
output lines
Power-frequency magnetic
field 1)

According to generic standards: EN 61000-6-1 and EN 61000-6-2
Contact discharge
EN 61000-4-2
8kV
on indirect coupling plane
Air discharge
15kV
EN 61000-4-3
80MHz-2.7GHz
20V/m
Input lines
2kV
EN 61000-4-4
Output lines
2kV
EN 61000-4-5
500V
+1kV
+/-  earthed DIN rail
EN 61000-4-5
500V
+1kV
+/-  earthed DIN rail
EN 61000-4-6
0.15-80MHz
20V

Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A
Criterion A

EN 61000-4-6

0.15-80MHz

20V

Criterion A

EN 61000-4-8

50Hz

30A/m

Criterion A

Criterion A

Criterions:
A: Redundancy module shows normal operation behavior within the defined limits.
Notes:
1) A test is not applicable according to EN 61000-6-2, since the device does not contain components susceptible to magnetic fields, e.g. hallelements, electrodynamic microphones, etc.

According to generic standards: EN 61000-6-3 and EN 61000-6-4
EMC Emission 4)
limits for DC power ports according EN
Conducted emission
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1
61000-6-3 fulfilled 2) 3)
input lines
limits for DC power ports according EN
Conducted emission
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1
output lines
61000-6-3 fulfilled 2) 3)
Radiated emission
EN 55011, EN 55032
Class B 3)
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.
Notes:
2) For information only, not mandatory for EN 61000-6-3.
3) Provided, that power sources connected on the inputs fulfill the requirements too.
4) The redundancy module incorporates only diodes and no RF-generating circuits and does not contribute to EMC emissions.

Jul. 2021 / Rev. 2.2 DS-PIRD20.241
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0Germany

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DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULEPIANO-Series

10. ENVIRONMENT
Operational temperature 1)
Output de-rating
Storage temperature
Humidity 2)
Vibration sinusoidal 3)

Shock 3)

Altitude-40°C to +70°C (-40°F to 158°F)
0.5A/°C-40 to +85°C (-40°F to 185°F)
5 to 95% r.H.
2-17.8Hz: ±1.6mm
17.8-500Hz: 2g
2 hours / axis
30g 6ms, 20g 11ms
3 bumps / direction
18 bumps in total
0 to 2000m (0 to 6 560ft)
2000 to 6000m (6 560 to 20 000ft)

Altitude derating
Over-voltage category

1.25A/1000m or 5°C/1000m
not applicable

Degree of pollution

2

1)
2)
3)

Reduce output power above +60°C+55 to +70°C (140°F to 158°F), see Fig. 10-1
For storage and transportation
IEC 60068-2-30
IEC 60068-2-6

IEC 60068-2-27

Without any restrictions
Reduce output power or ambient
temperature, see Fig. 10-2
> 2000m (6500ft), see Fig. 10-2
The concept of the overvoltage category isused for equipment energized directly fromthe low voltage mains (IEC 60664-1 §4.3.3.2.1).
IEC 62103, EN 62477-1, not conductive

Operational temperature is the same as the ambient temperature and is defined as the air temperature 2cm below the unit.
Do not energize while condensation is present
Tested in combination with DIN rails according to EN 60715 with a height of 15mm and a thickness of 1.3mm and standard mounting
orientation.
Fig. 10-1 Output current vs. ambient temp.
Allowed Output Current

30A
25
20

Fig. 10-2 Output current vs. altitude

Allowed Output Current

30A

at overload / short circuit
normal mode

20

15

15

10

10

5
0
-40

20

40

55

A
B

A... Tamb < 55°C
B... Tamb < 70°C

0
70°C

B

normal mode

5

Ambient Temperature0

overload / short circuit

25

0

2000

Altitude

4000

6000m

Jul. 2021 / Rev. 2.2 DS-PIRD20.241
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0Germany

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DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULEPIANO-Series

11. PROTECTION FEATURES
Output over-current protection
Reverse input polarity protection
Degree of protection
Over-temperature protection
Input transient protection
Output transient protection
Internal input fuse

not included
not included
IP 20
not included
includedincluded
not included

Wrong input polarity might damage the device.
EN/IEC 60529
see chapter 9 for details and values
see chapter 9 for details and values

12. SAFETY FEATURES
Input / output separation
Safety level of output voltage

Class of protection

no galvanic separation
Schottky diode between input and output
The output voltage is regarded to be SELV (EN 60950-1) or PELV (EN 60204-1, EN
62477-1, IEC 60364-4-41) if the input voltage fulfil the requirements for a SELV
source or PELV source.
III

13. DIELECTRIC STRENGTH
Not applicable (plastic housing and no galvanic isolation)

Jul. 2021 / Rev. 2.2 DS-PIRD20.241
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0Germany

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PIRD20.241
PIANO-Series

DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE

14. APPROVED, FULFILLED OR TESTED STANDARDSUL 508

IEC 60950-1

UL 60950-1

ATEX

IECEx

Class I Div 2

VDMA 24364

UL Certificate
Listed equipment for category NMTR - Industrial 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
Agency Certificate (Bureau Veritas)
EN 60079-0 Explosive atmospheres - General requirements
EN 60079-7 Equipment protection by type of protection "e"Certificate: EPS 11 ATEX 1 312 X
Temperature Code: T4
Type of Protection: ec
IECEx Certificate
IEC 60079-0 Explosive atmospheres - General requirements
IEC 60079-7 Equipment protection by type of protection "e"Certificate: IECEx EPS 12.0032X
Temperature Code: T4
Type of Protection: ec
CSA Certificate
Power Supplies for Hazardous Location
Applicable for Canada and US
CSA Class: 5318-01 (Canada), 5318-81 (USA)
Temperature Code: T4
Groups: A, B, C and D
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

Jul. 2021 / Rev. 2.2 DS-PIRD20.241
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0Germany

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PIRD20.241
PIANO-Series

DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE

15. REGULATORY PRODUCT COMPLIANCE
EU Declaration ofConformity

REACH Directive

WEEE Directive

KC Korean Certificate

EAC TR Registration

The CE mark indicates conformance with the- EMC directive- ATEX directive- RoHS directive
Manufacturer's Statement
EU-Directive regarding the Registration, Evaluation, Authorization
and Restriction of Chemicals
Manufacturer's Statement
EU-Regulation on Waste Electrical and Electronic Equipment
Registered in Germany as business to business (B2B) products.
KC Registration
Korean registration of Broadcasting and Communication
Equipment
Registered under Clause 3, Article 58-2 of Radio Waves Act.
EAC Certificate
EAC EurAsian Conformity - Registration Russia, Kazakhstan andBelarus8504408200, 8504409000

Jul. 2021 / Rev. 2.2 DS-PIRD20.241
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0Germany

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DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULEPIANO-Series

16. PHYSICAL DIMENSIONS AND WEIGHT
Width
HeightDepth

WeightDIN rail
Plastic Material of Housing
Installation Clearances

39mm 1.54’’124mm 4.88’’
124mm 4.88’’
The DIN rail depth must be added to the unit depth to calculate the total required
installation depth.
280g / 0.62lb
Use 35mm DIN rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
Flame retardant Polycarbonate (PC) - UL94-V0
Vicat softening temperature specified with 149°C according to ASTM D1525
See chapter 2

Fig. 16-1 Front viewFig. 16-2 Side view

Jul. 2021 / Rev. 2.2 DS-PIRD20.241
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0Germany

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PIRD20.241
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULEPIANO-Series

17. APPLICATION NOTES
17.1. USING ONLY ONE INPUT INSTEAD OF BOTH CHANNELS
Using only one input instead of both is allowed up to a nominal input current of 20A at max. +55°C ambient
temperature.
However, it is always recommended to connect both input path in parallel for reduced power losses and voltage drop.
In cases when this is not possible, the following values can be expected:
Voltage drop, input to output

typ.
typ.

Power losses
typ.
typ.

585mV
645mV
0W
5.85W
12.9W

Fig. 17-1 Input to output voltage dropwhen only one input is used

at 1x10A, 25°C, see Fig. 17-1
at 1x20A, 25°C, see Fig. 17-1
at 0A, 25°C
at 10A, 25°C
at 20A, 25°C
Fig. 17-2 Test setup for voltage drop measurements

Voltage Drop, typ.

PIC480.241
24V, 20A

700mV

A
B

600mV

I1
A

+

V U1

-

OutputPIRD20.241
Input 1IOUT
A
OutputVariable
Load,
0-20A

UOUT V

500mV
A... 25°C
B... 60°C

400mV
300mV

Input, Output Current

200mV
0

5A

10A

15A

Input 2
must notused

Input 220A

Voltage Drop = U1 - UOUT

17.2. RECOMMENDATIONS FOR REDUNDANCY
Recommendations for the configuration of redundant power systems:-

Use three-phase power supplies to gain functional safety if one phase fails.

-

When single-phase power supplies are utilized connect them to different phases or mains circuits if possible.

-

Use separate input fuses for each power supply.

-Set the power supply in “Parallel-Use” mode if this feature is available-

It is desirable to set the output voltages of all power supplies to the same value.

Jul. 2021 / Rev. 2.2 DS-PIRD20.241
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0Germany

15/17

PIRD20.241
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULEPIANO-Series

17.3. INDUCTIVE AND CAPACITIVE LOADSThe unit is designed to supply any kind of loads, including unlimited capacitive and inductive loads.

17.4. USE IN A TIGHTLY SEALED ENCLOSURE
When the redundancy module is installed in a tightly sealed enclosure, the temperature inside the enclosure will behigher than outside. The inside temperature defines the ambient temperature for the redundancy module.
Results from such an installation:
Power supply is placed in the middle of the box, no other heat producer inside the box
Enclosure:
Load:
Input:
Temperature inside enclosure:
Temperature outside enclosure:
Temperature rise:

Rittal Typ IP66 Box PK 9516 100, plastic, 110x180x165mm
24V, 16A; (=80%) load is placed outside the box
2x 24Vdc, 8A
42.4°C (in the middle of the right side of the power supply with a distance of 2cm)
23.1°C
19.3K

17.5. EXAMPLE: REDUNDANCY FOR CONTROLSThe example shows a cost effective solution to get redundant power for a PLC or controller system.
In many cases, two power supplies are used; one for the demanding loads and another one for the controls andsensitive loads. The power supply for the demanding loads can be used as a redundant source to supply the controls.
Traditional approach:

PS1
PS2

Load

Improved approach:

PLC

PS1
PS2

Load
PIRD20

PLC

Jul. 2021 / Rev. 2.2 DS-PIRD20.241
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0Germany

16/17

PIRD20.241
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULEPIANO-Series

17.6. EXAMPLE: 1+1 REDUNDANCY UP TO 10A
1+1 Redundancy up to 10A requires two 10A power supplies and one PIRD20.241 redundancy module.
Fig. 17-3 Wiring diagram, 1+1 Redundancy, 10A output current

FailureMonitor+ + --- - + +

+ + -

IN IN
1 2

24-28V
DC-OK-

24-28V
DC-OK

DCOK

DCOK
PIRD20.241

PIC240.24x
Power Supply

Redundancy
Module

PIC240.24x
Power Supply

OUT

+ + -

L N PEL N PE

I

I

24V, 10A
Load

L
N
PE

Note: Use separate mains systems for each power supply whenever it is possible

17.7. EXAMPLE: 1+1 REDUNDANCY UP TO 20A
1+1 Redundancy up to 20A requires two 20A power supplies and two PIRD20.241 redundancy modules.
Fig. 17-4 Wiring diagram, 1+1 Redundancy, 20A output current
optional for reduced power losses

FailureMonitor+ + --24-28V
DC-OK-- - + +

PIC480.24x
Power Supply

PIRD20.241+ + -- - + +

IN IN
1 2

DCOK

DCOK
Redundancy
ModuleOUT+ + -L N PEPIRD20.241

L N PE

Redundancy
ModuleOUT+ + -PIC480.24x
Power Supply

I

IN IN
1 2

24-28V
DC-OK

I

24V, 20A
Load

L
N
PE

Note: Use separate mains systems for each power supply whenever it is possible

Jul. 2021 / Rev. 2.2 DS-PIRD20.241
All parameters are specified at 24V, 20A output current, 25°C ambient and after a 5 minutes run-in time unless otherwise noted
www.pulspower.com Phone +49 89 9278 0Germany

17/17