Puls YR20.242 Data Sheet

Q.

YR20.242

Y-Series

GENERAL DESCRIPTION

The YR20.242 is a redundancy module for building
redundant power supply systems. It is equipped with
two input channels and one output. The two inputs are
decoupled by MOSFET technology.

In addition to the YR20.242, the YR20.246 is available
which is featured with an automated load sharing
between the connected power supplies and functions
which monitor defects in the redundancy circuit or too
high output currents, which could prevent redundancy,
if one power supply fails.

The YR20.242 utilizes MOSFETs instead of diodes for the
decoupling of the two input channels. This reduces the
heat generation and the voltage drop between input
and output. The redundancy module does not require
an additional auxiliary voltage.

Due to the low power losses, the unit is very slender and
only requires 32mm width on the DIN-rail. Large
connection terminals allow for a safe and fast
installation. The large international approval package
makes this unit suitable for nearly every application.

ORDER NUMBERS

Redundancy YR20.242
Module

Accessory ZM11.SIDE Side mount bracket

12-28V, 20A, DUAL REDUNDANCY MODULE

MOSFET REDUNDANCY MODULE

 For N+1 and 1+1 Redundant Systems
 Dual Input with Single Output
 Only 60mV Voltage Drop at 10A Output Current
 Only 0.6W Loss at 10A
 160% (32.5A) Peak Load Capability
 Reverse Input Polarity Protection
 Full Power Between -40°C and +70°C
 Width only 32mm
 Rugged Metal Housing
 Easy Wiring:

Distribution Terminal for Negative Pole Included

SHORT-FORM DATA

Input voltage DC 12-28V ±30%
Input voltage range 8.4-36.4Vdc
Input current 2x 0-24A ambient <+45°C
2x 0-20A ambient <+70°C

**)

**

Output current 0-24A ambient <+45°C
0-20A ambient <+70°C

Input to output
voltage drop

max. 26A

60mV
110mV

in overload
short circuit mode

input: 2x5A
input: 2x10A

*)

or

Power losses 210mW at no load

0.6W input: 2x5A

2.0W input: 2x10A
Temperature range -40°C to +70°C operational
Dimensions 32x124x117mm WxHxD
Weight 250g, 0.56lb

*) Currents at voltages below 6V
**) Sum of input current of both input max. 20A rsp. 24A

MARKINGS

IND. CONT. E

UL 508

UL 60950-1

Class I Div 2

planned

IECEx ATEX

Jul. 2017 / Rev. 1.3 DS-YR20.242-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.

Marine

planned

1/17

YR20.242

Y-Series

12-28V, 20A, DUAL REDUNDANCY MODULE

INDEX

Page Page

1.

Intended Use .......................................................3

2. Installation Requirements...................................3

3. Input and Output Characteristics .......................4

4. Power Losses........................................................5

5. Lifetime Expectancy and MTBF...........................5

6. Terminals and Wiring..........................................6

7. Functional Diagram.............................................6

8. Front Side and User Elements.............................7

9. EMC......................................................................8

10. Environment ........................................................9

11. Protection Features ...........................................10

12. Safety Features ..................................................10

13. Dielectric Strength ............................................10

14. Approvals...........................................................11

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.

15. RoHS, REACH and Other Fulfilled Standards .. 11

16. Physical Dimensions and Weight ..................... 12

17. Accessories ........................................................ 13

17.1. ZM11.SIDE - Side Mounting Bracket........13

18. Application Notes............................................. 14

18.1. Using Only One Input instead of Both

Channels...............................................................14

18.2. Recommendations for Redundancy.........15

18.3. Inductive and Capacitive Loads................15

18.4. Sidewards Installation Clearances............15

18.5. 1+1 Redundancy up to 10A...................... 16

18.6. N+1 Redundancy, Example with 30A ......16

18.7. Mounting Orientations ............................17

TERMINOLOGY AND ABREVIATIONS

DC 24V A figure displayed with the AC or DC before the value represents a nominal voltage with

standard tolerances (usually ±15%) 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

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 power supply outputs should be isolated from each
other by utilizing diodes or other switching arrangements. E.g. two 10A power supplies are
needed to achieve a 10A redundant
system.

N+1 Redundancy Use of three or more identical power

supplies in parallel to provide
continued operation 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.

ACDCACDCACDCACDCACDCAC

IN 1

IN 2 IN 1

OUT

N+1

Redundancy

OUT

-

+

Load

IN 2 IN 1

OUT

IN 2

DC

Redundancy

ACDCAC

IN 1

1+1

OUT

+

Load

DC

IN 2

-

Jul. 2017 / Rev. 1.3 DS-YR20.242-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.

2/17

YR20.242

Y-Series

12-28V, 20A, DUAL REDUNDANCY MODULE

1. INTENDED USE

This redundancy module is designed for installation in an enclosure and is intended for the general use such as in
industrial control, office, communication, and instrumentation equipment.

This 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 constant current overload behavior as well as any kind of
“Hiccup” overload behavior.

Do not use this redundancy module in equipment, where malfunction may cause severe personal injury or threaten
human life.

2. INSTALLATION REQUIREMENTS

This device may only be installed and put into operation by qualified personnel.
This device does not contain serviceable parts.
If damage or malfunction should occur during installation or operation, immediately turn power off and send unit to

the factory for inspection.
Mount the unit on a DIN-rail so that the input terminals are located on the bottom and the output terminals on the

top of the unit. For other mounting orientations see de-rating requirements of chapter 18.7 in this document.
This device is designed for convection cooling and does not require an external fan. Do not obstruct airflow and do

not cover the ventilation grid (e.g. cable conduits) by more than 30%!
Keep the following installation clearances:

40mm on top,
20mm on the bottom,
5mm on the left and right sides are recommended when the device is loaded permanently with more than 50% of the
rated output current. Increase the side clearance to 15mm in case the adjacent device is a heat source (e.g. another
power supply). See chapter 18.4 for other allowed clearances when used with the PULS DIMENSION series in a 1+1
redundant configuration.

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.

The input must be powered from a SELV source (according to IEC 60950-1), a PELV source (according to IEC 62477-1) or
an Isolated Secondary Circuit (according to UL 508).

Do not ground or earth the positive output pole which could prevent redundancy in case of a ground failure. Ground
the negative output pole when needed.

WARNING

- 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 open, modify or repair the unit.

- Use caution to prevent any foreign objects from entering the housing.

- Do not use in wet locations or in areas where moisture or condensation can be expected.

- Do not touch during power-on, and immediately after power-off. Hot surfaces may cause burns.

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

Jul. 2017 / Rev. 1.3 DS-YR20.242-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.

3/17

YR20.242

Y-Series

12-28V, 20A, DUAL REDUNDANCY MODULE

3. INPUT AND OUTPUT CHARACTERISTICS

Number of inputs - 2
Number of outputs - 1
Input voltage nom. DC 12-28V ±30%
Input voltage range - 8.4-36.4Vdc
Voltage drop, input to output typ. 60mV at 2x5A, 25°C, see Fig. 3-1
typ. 110mV at 2x10A, 25°C, see Fig. 3-1
typ. 130mV at 2x12A, 25°C, see Fig. 3-1
Input current nom. 2x 0-24A
nom. 2x 0-20A
nom. 2x 32.5A

1)

continuous, ambient temperature < +45°C

1)

continuous, ambient temperature < +70°C

2)

for max. 5 seconds
max. 2x 700A for max. 1ms
Output current nom. 24A continuous, ambient temperature < +45°C
nom. 20A continuous, ambient temperature < +70°C

3)

nom. 32.5A

max.

26A in overload /short-circuit (voltage < 6V). Ensure that the

for max. 5 seconds

sum of input currents does not exceed this value.
Reverse current max. 1mA at 24V, per input, -40°C to +70°C
Reverse voltage max. 40Vdc voltage applied to the output, continuously allowed
Output capacitance typ. 320μF

1) Ensure that the sum of both input currents stays below 24A rsp. 20A.

2) Ensure that the sum of both input currents stays below 32.5A.

3) The average value (R.M.S. value) of the output current must not exceed the values of the continuous output current.

Fig. 3-1 Input to output voltage drop Fig. 3-2 Test setup for voltage drop measurements

150mV

125mV

100mV

75mV

50mV

25mV

0mV

Output:

Input:

Voltage Drop, typ

0

5A 15A

0

2x5A2x2.5A

60°C

25°C

Input / Output Current

25A

20A10A

2x12.5A

2x10A2x7.5A

Power
Supply

+

24V, 12A

-

Power
Supply

+

24V, 12A

-

I1I2=

YR20.242

I

1

A

Input 1

V

U

1

I

2

A

Input 2

V

U

2

U2U1= Voltage Drop

Output

Variable

OUT

OUT

Load,
0-24A

A

V

U1=

-

Output

I

U

U

OUT

Jul. 2017 / Rev. 1.3 DS-YR20.242-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.

4/17

YR20.242

Y-Series

12-28V, 20A, DUAL REDUNDANCY MODULE

4. POWER LOSSES

Power losses typ.
typ.

DC 12V DC 24V

0.6W 0.6W input: 2x5A, ambient temperature: 25°C

2.0W 2.0W

Standby power losses typ. 0.11W 0.21W at no output current

Fig. 4-1 Power losses Fig. 4-2 Test setup for power loss measurements

Power Losses, typ.

3.5W

3.0

60°C

25°C

Power
Supply

24V, 12A

2.5

2.0

1.5

1.0

0.5

0

02.55 15

Output Current

2012.57.5 10 17.5

25A22.5

Power
Supply

24V, 12A

I1I2=

input: 2x10A, ambient temperature: 25°C

YR20.242

I

1

A

+

-

+

-

Input 1

V

U

1

I

2

A

Input 2

V

U

2

U2U1=Losses

U1=

Output

I1+)(

*

U

2

*

Output

I

OUT

A

U

OUT

I

2

Variable

Load,
0-24A

V

U

OUT

-

I

OUT

*

5. LIFETIME EXPECTANCY AND MTBF

The redundancy module has two input channels which are completely independent from each other. Each control
circuit, auxiliary voltage source, or other circuitry in the module are designed separately for each input. 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

553 000h

1 563 000h

**)

MTBF

SN 29500, IEC 61709 10 050 000h 7 895 000h at 24V and 40°C

Input: 2x5A

Output: 10A

*)

355 000h

*)

Input: 2x10A

Output: 20A

1 003 000h

*)

at 24V and 40°C

*)

at 24V and 25°C

16 777 000h 13 403 000h at 24V and 25°C

**)

MTBF

MIL HDBK 217F 2 030 000h 1 890 000h Ground Fixed GF40 (24V and 40°C)
2 801 000h 2 588 000h Ground Fixed GF25 (24V and 25°C)
441 000h 404 000h Ground Benign GB40 (24V and 40°C)
604 000h 548 000h Ground Benign GB25 (24V and 25°C)

*) 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 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.

Jul. 2017 / Rev. 1.3 DS-YR20.242-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.

5/17

YR20.242

Y-Series

12-28V, 20A, DUAL REDUNDANCY MODULE

6. TERMINALS AND WIRING

Type Screw termination, IP20 Finger safe construction.

Solid wire max. 6mm2
Stranded wire max. 4mm
American Wire Gauge AWG 20-10
Max. wire diameter 2.8mm (including ferrule)
Wire stripping length 7mm / 0.275inch
Screwdriver 3.5mm slotted or Pozidrive No 2
Recommended tightening torque 0.8Nm, 7lb.in

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) Screws of unused terminal compartments should be securely tightened.
e) Ferrules are allowed.

Input and Output

Suitable for field installation.

2

7. FUNCTIONAL DIAGRAM

Input 1

Input 2

Jul. 2017 / Rev. 1.3 DS-YR20.242-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.

Fig. 7-1 Functional diagram

control

+

-

+

-

control

+

Output

-

Chassis
Ground

6/17

YR20.242

Y-Series

8. FRONT SIDE AND USER ELEMENTS

Fig. 8-1 Front side

Output Terminals (screw terminals)

A

B Chassis Ground Terminal

Connection of the chassis is optional and not required since the unit fulfils the
requirements according to protection class III.

C Input Terminals for Input 1 (screw terminals)

D

Input Terminals for Input 2 (screw terminals)

12-28V, 20A, DUAL REDUNDANCY MODULE

Jul. 2017 / Rev. 1.3 DS-YR20.242-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.

7/17

YR20.242

Y-Series

12-28V, 20A, DUAL REDUNDANCY MODULE

9. EMC

The redundancy module is suitable for applications in industrial environment as well as in residential, commercial and
light industry environment without any restrictions.

EMC Immunity

Electrostatic discharge EN 61000-4-2 Contact discharge

Electromagnetic RF field EN 61000-4-3 80MHz-2.7GHz 20V/m Criterion A
Fast transients (Burst) EN 61000-4-4 Input lines

Surge voltage on input
lines

Surge voltage on output
lines

Conducted disturbance EN 61000-4-6 0.15-80MHz 20V Criterion A
Power-frequency magnetic

field 1)

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. hall

elements, electrodynamic microphones, etc.

EMC Emission

Conducted emission
input lines

Conducted emission
output lines

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.

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.

Switching frequency

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

8kV

Air discharge

Output lines

EN 61000-4-5 + Æ -

+/- Æ Chassis ground

EN 61000-4-5 + Æ -

+/- Æ Chassis ground

EN 61000-4-8 50Hz 30A/m Criterion A

According to generic standards: EN 61000-6-3 and EN 61000-6-4
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1 limits for DC power ports according

IEC/CISPR 16-1-2, IEC/CISPR 16-2-1 limits for DC power ports according

The internal auxiliary supply is generated with a boost converter.
The switching frequency varies from 140kHz to 500kHz depending on the input voltage.

15kV

2kV
2kV

500V
1kV

500V
1kV

EN 61000-6-3 fulfilled

EN 61000-6-3 fulfilled

3)

Criterion A
Criterion A

Criterion A
Criterion A

Criterion A
Criterion A

Criterion A
Criterion A

2) 3)

2) 3)

Jul. 2017 / Rev. 1.3 DS-YR20.242-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.

8/17

YR20.242

Y-Series

12-28V, 20A, DUAL REDUNDANCY MODULE

10. ENVIRONMENT

Operational temperature
Storage temperature -40 to +85°C (-40°F to 185°F) for storage and transportation
Humidity

**)

5 to 95% r.H. IEC 60068-2-30

Vibration sinusoidal

***)

Shock

30g 6ms, 20g 11ms

Altitude 0 to 2000m (0 to 6 560ft) without any restrictions
2000 to 6000m (6 560 to 20 000ft) reduce output power or ambient temperature,

Altitude de-rating 1.25A/1000m or 5°C/1000m > 2000m (6500ft), see Fig. 10-2
Over-voltage category not applicable The concept of the overvoltage category is

Degree of pollution 2 EN 62477-1, not conductive
LABS compatibility The unit does not release any silicone or other LABS-critical substances and is suitable for

*) 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. Fig. 10-2 Output current vs. altitude

Allowed Output Current

32.5A

s

h

o

r

t

t

e

24

n

o

r

m

l

20

15

10

5

0

a

Ambient Temperature

-25

-40 0 20 45

*)

-40°C to +70°C (-40°F to 158°F)

***)

2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g

2 hours / axis

3 bumps / direction, 18 bumps in total

use in paint shops.

r

m

(

s

<

5

)

o

m

d

e

70°C

IEC 60068-2-6

IEC 60068-2-27

see Fig. 10-2

used for equipment energized directly from
the low voltage mains (IEC 60664-1 §4.3.3.2.1).

Allowed Output Current

32.5A

s

h

o

r

t

t

e

r

m

(

s

<

5

)

n

o

r

m

l

a

m

o

d

24

20

15

10

A... Tamb < 45°C

5

B... Tamb < 70°C

0

0 2000 4000

e

A
B

Altitude

6000m

Jul. 2017 / Rev. 1.3 DS-YR20.242-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.

9/17

YR20.242

Y-Series

12-28V, 20A, DUAL REDUNDANCY MODULE

11. PROTECTION FEATURES

Output over-current protection not included
Reverse input polarity

protection
Degree of protection IP 20 EN/IEC 60529
Penetration protection > 3.6mm e.g. screws, small parts
Over-temperature protection not included
Input transient protection included see EMC section
Output transient protection included see EMC section
Internal input fuse not included

included unit does not start when input voltage is reversed

12. SAFETY FEATURES

Input / output separation no galvanic separation Mosfet between input and output
Safety level of output voltage 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 fulfills the requirements for a SELV

source or PELV source.
Class of protection III PE (Protective Earth) or chassis connection not required
PE resistance < 0.1Ohm between housing and chassis-ground terminal

13. DIELECTRIC STRENGTH

The input and output voltages have the same reference, are floating and have no ohmic connection to ground.
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 input/output
terminals together before conducting the test.
When testing, set the cut-off current settings to the value in the table below.

Fig. 13-1 Dielectric strength

In- / Output

Jul. 2017 / Rev. 1.3 DS-YR20.242-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.

+

-

A

Chassis

Type test 60s 500Vac

Factory test 5s 500Vac

Field test 5s 500Vac

Cut-off current setting > 2mA

A

10/17

YR20.242

14. APPROVALS

EC Declaration of Conformity

IEC 60950-1

UL 508

UL 60950-1

ANSI / ISA 12.12.01-2007
Class I Div 2,
planned

ATEX
EN 60079-0, EN 60079-7

IECEx
IEC 60079-0, IEC 60079-7

Marine,
planned

EAC TR Registration

Y-Series

IND. CONT. EQ.

II 3G Ex ec IIC T4 Gc

IECEx

Ex ec IIC T4 Gc

12-28V, 20A, DUAL REDUNDANCY MODULE

The CE mark indicates conformance with the

- EMC directive and the

- ATEX directive.
CB Scheme,

Information Technology Equipment

Listed for use as Industrial Control Equipment;
U.S.A. (UL 508) and Canada (C22.2 No. 107-1-01);
E-File: E198865

Recognized for use as Information Technology Equipment,
Level 5; U.S.A. (UL 60950-1) and Canada (C22.2 No. 60950);
E-File: E137006

LISTED for use in Hazardous Location Class I Div 2 T4 Groups
A,B,C,D systems; U.S.A. (ANSI / ISA 12.12.01-2007) and Canada
(C22.2 No. 213-M1987)

Suitable for use in Category 3 Zone 2 locations.
Number of ATEX certificate: EPS 11 ATEX 1 312 X
The redundancy module must be built-in in an IP54 enclosure.

Suitable for use in Category 3 Zone 2 locations.
Number of IECEx certificate: IECEx EPS 12.0032X

GL (Germanischer Lloyd) classified
Environmental category: C, EMC1
Marine and offshore applications

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

15. ROHS, REACH AND OTHER FULFILLED STANDARDS

RoHS Directive

REACH Directive

Jul. 2017 / Rev. 1.3 DS-YR20.242-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.

Directive 2011/65/EU of the European Parliament and the
Council of June 8
certain hazardous substances in electrical and electronic
equipment.

Directive 1907/2006/EU of the European Parliament and the
Council of June 1
Evaluation, Authorisation and Restriction of Chemicals
(REACH)

th

, 2011 on the restriction of the use of

st

, 2007 regarding the Registration,

11/17

YR20.242

Y-Series

12-28V, 20A, DUAL REDUNDANCY MODULE

16. PHYSICAL DIMENSIONS AND WEIGHT

Width 32mm 1.26’’
Height 124mm 4.88’’
Depth 117mm 4.61’’

The DIN-rail height must be added to the unit depth to calculate the total required

installation depth.
Weight 250g / 0.56lb
DIN-Rail Use 35mm DIN-rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
Housing material Body: Aluminium alloy

Cover: zinc-plated steel
Installation clearances See chapter 2

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

Jul. 2017 / Rev. 1.3 DS-YR20.242-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.

12/17

YR20.242

Y-Series

12-28V, 20A, DUAL REDUNDANCY MODULE

17. ACCESSORIES

17.1. ZM11.SIDE - SIDE MOUNTING BRACKET

This bracket is used to mount the YR20.242 redundancy 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.

Side mounting without DIN-

Fig. 17-1

rail brackets

Side mounting with DIN-rail

Fig. 17-2

brackets

Fig. 17-3

Mounting Dimensions

Side mounting bracket

Jul. 2017 / Rev. 1.3 DS-YR20.242-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.

13/17

YR20.242

Y-Series

12-28V, 20A, DUAL REDUNDANCY MODULE

18. APPLICATION NOTES

18.1. USING ONLY ONE INPUT INSTEAD OF BOTH CHANNELS

Using only one input instead of both is allowed up to a nominal input current of 24A (at max. +45°C ambient
temperature) or 20A (at max. +70°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. 80mV

at 1x10A, 25°C, see Fig. 18-1
typ. 150mV at 1x20A, 25°C, see Fig. 18-1
Power losses typ.
typ.

0.75W

3.0W

at 1x10A, 25°C, see Fig. 18-3

at 1x20A, 25°C, see Fig. 18-3
Standby power losses typ. 0.07W at 12V operation
typ. 0.14W at 24V operation

Fig. 18-1 Input to output voltage drop when only one

Voltage Drop, typ.

200mV

input is used

60°C

25°C

150mV

Fig. 18-2 Test setup for voltage drop measurements

Power
Supply

24V, 24A

+

-

YR20.242

1

I
A

Input 1

V

U

1

Output

Variable

OUT

OUT

Load,
0-24A

A

V

Output

I

U

100mV

50mV

0mV

5A 15A

Output Current

20A10A0

25A

Input 2

Voltage Drop

Fig. 18-3 Power losses when only one input is used Fig. 18-4 Test setup for power loss measurements

Power Losses, typ.

6W

5.0

4.0

3.0

60°C

25°C

Power
Supply

24V, 24A

+

-

YR20.242

I

1

A

Input 1

V

U

1

Output

Output

I

OUT

A

U

OUT

V

2.0

1.0

0

02.55 15

Output Current

2012.57.5 10 17.5

25A22.5

Input 2

Losses

U1=

U

OUT

-*I

1

I

OUT

*

U1=

Variable

Load,
0-24A

U

OUT

-

Jul. 2017 / Rev. 1.3 DS-YR20.242-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.

14/17

YR20.242

Y-Series

12-28V, 20A, DUAL REDUNDANCY MODULE

18.2. RECOMMENDATIONS FOR REDUNDANCY

Recommendations for the configuration of redundant power systems:

- Use separate input fuses for each power supply.

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

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

- 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.

18.3. INDUCTIVE AND CAPACITIVE LOADS

The unit is designed to supply any kind of loads, including unlimited capacitive and inductive loads.

18.4. SIDEWARDS INSTALLATION CLEARANCES

The minimum clearance recommendations are defined in chapter 2.
Normally, the following installation clearance are recommended: 40mm on top, 20mm on the bottom, 5mm on the

left and right sides when the device is loaded permanently with more than 50% of the rated power. Increase this
clearance to 15mm in case the adjacent device is a heat source (e.g. another power
supply).

The clearance between the power supplies and the redundancy module can be
reduced to zero under the following conditions:

- 1+1 redundancy application with maximum 12A output current.

- The power supplies are from the PULS DIMENSION series.

- The redundancy module is placed between the two power supplies.

- The output voltage is set to the same level on both power supplies.

+

Output

Power

Supply

Input

-

-

+

+

IN 2

IN 1

YR20.242

Redundancy
Module

Output

+

Load

-

-

+

Output

Power

Supply

Input

0mm0mm

-

Jul. 2017 / Rev. 1.3 DS-YR20.242-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.

15/17

YR20.242

Y-Series

12-28V, 20A, DUAL REDUNDANCY MODULE

18.5. 1+1 REDUNDANCY UP TO 10A

1+1 Redundancy up to 10A requires two 10A power supplies and one YR20.242 redundancy module.

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

Fig. 18-5 Wiring diagram, 1+1 Redundancy, 10A output current

Failure

Monitor

+-+

-

+ +

+ +

- -

24V,10A

Power
Supply

L1 L2 L3 PE

I I I I I I

L1
L2
L3
PE

DC­OK

Input

1

YR20.242

Redundancy
Module

Output

-

optional

Input

2

+

- -

24V,10A

Power
Supply

L1 L2 L3 PE

DC­OK

10A

Load

18.6. N+1 REDUNDANCY, EXAMPLE WITH 30A

N+1 Redundancy up to 30A requires four 10A power supplies and two YR20.242 redundancy modules.

+ +

Power
Supply

L1 L2 L3 PE

L1
L2
L3

PE

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

Fig. 18-6 Wiring diagram, n+1 Redundancy, 30A output current

+-+

-

24V,10A

I I I

- -

DC­OK

Input

Input

1

YR20.242

Redundancy
Module

Output

-

optional

+ +

2

+

OK

Power
Supply

L1 L2 L3 PE

I I I I I I

- -

DC-

24V,10A

+ +

- -

24V,10A

Power
Supply

L1 L2 L3 PE

I I I

DC-

OK

+-+

Input

Input

2

1

YR20.242

Redundancy
Module

Output

+

-

optional

-

+ +

- -

24V,10A

Power
Supply

L1 L2 L3 PE

DC­OK

Failure

Monitor

30A

Load

Jul. 2017 / Rev. 1.3 DS-YR20.242-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.

16/17

YR20.242

Y-Series

12-28V, 20A, DUAL REDUNDANCY MODULE

18.7. MOUNTING ORIENTATIONS

Mounting orientations other than input terminals on the bottom and output on the top require a reduction in
continuous output power or a limitation in the maximum allowed ambient temperature. The amount of reduction
influences the lifetime expectancy of the power supply. Therefore, two different derating curves for continuous
operation can be found below:

Curve A1 Recommended output current.
Curve A2 Max allowed output current (results in approximately half the lifetime expectancy of A1).

Fig. 18-7
Mounting
Orientation A

(Standard
orientation)

Fig. 18-8

Mounting
Orientation B

(Upside down)

INPUT

Redundancy

Module

OUTPUT

INPUT

OUTPUT

Module

Redundancy

Fig. 18-9

Mounting
Orientation C

(Table-top
mounting)

Fig. 18-10

Mounting
Orientation D

(Horizontal cw)

OUTPUT

Redundancy

Module

INPUT

Fig. 18-11

Mounting
Orientation E

(Horizontal ccw)

INPUT

Module

Redundancy

OUTPUT

Output Current

24A

18

12

6

0

Ambient Temperature

20 30 40 50

Output Current

24A

18

12

6

0

Ambient Temperature

20 30 40 50

Output Current

24A

18

12

6

0

Ambient Temperature

20 30 40 50

Output Current

24A

18

12

6

0

Ambient Temperature

20 30 40 50

Output Current

24A

18

12

6

0

Ambient Temperature

20 30 40 50

A

1

70°C

60

A

1

60

60

60

60

70°C

A

2

A

1

70°C

A

2

A

1

70°C

A

2

A

1

70°C

Jul. 2017 / Rev. 1.3 DS-YR20.242-EN All parameters are typical values specified at 24V, 20A output current, 25°C ambient and
after a 5 minutes run-in time unless otherwise noted.

17/17