YR20.246
Y-Series
24-28V, 20A, D
UAL
R
EDUNDANCY
M
ODULE
M
OSFET
R
EDUNDANCY
M
ODULE
For 1+1 Redundancy with Automated Load Sharing
Dual Input with Single Output
Redundancy OK Signal Included which Reports the Loss
of Redundancy
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
G
ENERAL
D
ESCRIPTION
The YR20.246 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.
The device is equipped with an automated load sharing
feature, which can compensate a small voltage
imbalance between the power supplies connected to
the inputs in order to achieve an even current share. It
also monitors the function of the redundancy circuitry
and provides a signal in case of a failure or a high
output current, which could prevent redundancy if one
power supply fails. If this feature is not required the
YR20.242 is available.
The redundancy 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.
S
HORT
-
FORM
D
ATA
Input voltage
DC 24-28V
Input voltage range 18-35Vdc
Input current
2x 0-12A
2x 0-10A
Output current
0-24A
0-20A
max. 26A
Input to output
voltage drop
Power losses
±25%
ambient <+45°C
ambient <+70°C
ambient <+45°C
ambient <+70°C
in overload
*)
or
short circuit mode
**)
input: 2x5A
0.1-0.5V
**)
input: 2x10A
0.2-0.5V
1.7W
at no load
**)
2.6-4.7W
input: 2x5A
**)
5.6-8.7W
input: 2x10A
-40°C to +70°C operational
32x124x117mm WxHxD
310g, 0.69lb
Temperature range
Dimensions
Weight
*) Currents at voltages below 6V
**) Depending on load share function
O
RDER
N
UMBERS
Redundancy
Module
Accessory
YR20.246
ZM11.SIDE
Side mount bracket
M
ARKINGS
IND. CONT. EQ.
UL 508
UL 60950-1
Class I Div 2
planned
IECEx
ATEX
Marine
planned
Jul. 2017 / Rev. 1.4 DS-YR20.246-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.
www.pulspower.com Phone +49 89 9278 0
Germany
1/19
YR20.246
Y-Series
24-28V, 20A, D
UAL
R
EDUNDANCY
M
ODULE
I
NDEX
Page
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
Intended Use .......................................................3
Installation Requirements...................................3
Input and Output Characteristics .......................4
Power Losses........................................................5
Lifetime Expectancy and MTBF...........................5
Terminals and Wiring..........................................6
Functional Diagram.............................................6
Front Side and User Elements.............................7
“Redundancy OK” Relay Contact .......................8
“Load Share OK” Relay Contact .........................8
Automated Load Sharing....................................9
EMC....................................................................10
Environment ......................................................11
Protection Features ...........................................12
Safety Features ..................................................12
Page
16. Dielectric Strength............................................ 12
17. Approvals .......................................................... 13
18. RoHS, REACH and Other Fulfilled Standards .. 13
19. Physical Dimensions and Weight ..................... 14
20. Accessories ........................................................ 15
20.1. ZM11.SIDE - Side Mounting Bracket........15
21. Application Notes............................................. 16
21.1. Using Only One Input Instead of Both
Channels...............................................................16
21.2. Recommendations for Redundancy.........17
21.3. Inductive and Capacitive Loads................17
21.4. Sidewards Installation Clearances............17
21.5. 1+1 Redundancy up to 10A......................18
21.6. Mounting Orientations ............................19
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.
T
ERMINOLOGY AND
A
BREVIATIONS
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)
A figure with the unit (Vdc) at the end is a momentary figure without any additional
tolerances included.
A key word indicating flexibility of choice with no implied preference
A key word indicating a mandatory requirement
A key word indicating flexibility of choice with a strongly preferred implementation
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.
AC
DC
AC
DC
24Vdc
may
shall
should
1+1 Redundancy
IN 1 IN 2
OUT
-
Jul. 2017 / Rev. 1.4 DS-YR20.246-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.
www.pulspower.com Phone +49 89 9278 0
Germany
+
Load
2/19
YR20.246
Y-Series
24-28V, 20A, D
UAL
R
EDUNDANCY
M
ODULE
1. I
NTENDED
U
SE
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. I
NSTALLATION
R
EQUIREMENTS
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.
To ensure a proper load share function ensure that the wiring between the two power supplies and the redundancy
module is identical.
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 21.6 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 21.4 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
-
-
-
-
-
-
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 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.
Jul. 2017 / Rev. 1.4 DS-YR20.246-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.
www.pulspower.com Phone +49 89 9278 0
Germany
3/19
YR20.246
Y-Series
24-28V, 20A, D
UAL
R
EDUNDANCY
M
ODULE
3. I
NPUT AND
O
UTPUT
C
HARACTERISTICS
Number of inputs
Number of outputs
Input voltage
Input voltage range
Voltage drop, input to output
-
-
nom.
-
typ.
typ.
typ.
nom.
nom.
nom.
max.
nom.
nom.
nom.
max.
max.
max.
typ.
2
1
DC 24-28V ±25%
18-35Vdc
0.1-0.5V
0.2-0.5V
0.24-0.5V
2x 0-12A
2x 0-10A
2x 17A
1)
2x 700A
24A
20A
32.5A
26A
1mA
40Vdc
320μF
Input current
Output current
Reverse current
Reverse voltage
Output capacitance
1)
at 2x5A, load share function dependent, see Fig. 3-1
at 2x10A, load share function dependent, see Fig. 3-1
at 2x12A, load share function dependent, see Fig. 3-1
continuous, ambient temperature < +45°C
continuous, ambient temperature < +70°C
for max. 5 seconds
for max. 1ms
continuous, ambient temperature < +45°C
continuous, ambient temperature < +70°C
for max. 5 seconds
in overload /short-circuit (voltage < 6V). Ensure that the
sum of input currents does not exceed this value.
at 24V, per input, -40°C to +70°C
voltage applied to the output, continuously allowed
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
Voltage Drop, typ
Fig. 3-2
Test setup for voltage drop measurements
Power
Supply
24V, 12A
+
600mV
500mV
400mV
300mV
200mV
100mV
0mV
Output:
0
Input:
0
Input / Output Current
Depending on
Load Share
Regulation
60°C
25°C
I
1
A
V U
1
YR20.246
Output
I
OUT
A
Output
Variable
Load,
0-24A
Input 1
U
OUT
V
-
Power
Supply
24V, 12A
+
I
2
A
V U
2
Input 2
-
I
1
=
I
2
U
1
=
U
2
Voltage Drop =
U
1
-
U
OUT
25A
10A
20A
5A
15A
2x2.5A 2x5A 2x7.5A 2x10A 2x12.5A
Jul. 2017 / Rev. 1.4 DS-YR20.246-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.
www.pulspower.com Phone +49 89 9278 0
Germany
4/19
YR20.246
Y-Series
24-28V, 20A, D
UAL
R
EDUNDANCY
M
ODULE
4. P
OWER
L
OSSES
Power losses
Standby power losses
Fig. 4-1
Power losses
Power Losses, typ
typ.
typ.
typ.
2.6-4.7W
5.6-8.7W
1.7W
at 2x5A, 25°C ambient temperature
at 2x10A, 25°C ambient temperature
at no output current
Fig. 4-2
Test setup for power loss measurements
Power
Supply
24V, 12A
+
12W
10W
8W
6W
4W
2W
0
Output:
0
Input:
0
Depending on
Load Share
Regulation
25/
60°C
60°C
25°C
I
1
A
V U
1
YR20.246
Output
I
OUT
A
Output
Variable
Load,
0-24A
Input 1
U
OUT
V
-
Power
Supply
24V, 12A
+
I
2
A
V U
2
Input 2
Input / Output Current
-
25A
10A
20A
5A
15A
2x2.5A 2x5A 2x7.5A 2x10A 2x12.5A
I
1
=
I
2
U
1
=
U
2
Losses = (
U
1
*
I
1
+
U
2
*
I
2
) -
U
OUT
*
I
OUT
5. L
IFETIME
E
XPECTANCY 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
*)
MTBF
**)
SN 29500, IEC 61709
MTBF
**)
MIL HDBK 217F
Input: 2x5A
Output: 10A
372 000h
*)
1 053 000h
*)
2 306 000h
3 913 000h
964 000h
1 379 000h
278 000h
381 000h
Input: 2x10A
Output: 20A
182 000h
*)
516 000h
*)
1 954 000h
3 359 000h
858 000h
1 226 000h
243 000h
330 000h
at 24V and 40°C
at 24V and 25°C
at 24V and 40°C
at 24V and 25°C
Ground Fixed GF40 (24V and 40°C)
Ground Fixed GF25 (24V and 25°C)
Ground Benign GB40 (24V and 40°C)
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. 1.4 DS-YR20.246-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.
www.pulspower.com Phone +49 89 9278 0
Germany
5/19
