Puls DIMENSION YR40.246 User manual

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
MOSFET REDUNDANCY MODULE
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
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GENERAL DESCRIPTION
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.
SHORT-FORM DATA
Input voltage DC 24-28V ±25%
Input voltage range 18-35Vdc
Input current 2x 0-12A ambient <+45°C
2x 0-10A ambient <+70°C
Output current 0-24A ambient <+45°C
0-20A ambient <+70°C
max. 26A in overload*) or
short circuit mode
Input to output
voltage drop
0.1-0.5V**)
0.2-0.5V**)
input: 2x5A
input: 2x10A
Power losses 1.7W at no load
2.6-4.7W**) input: 2x5A
5.6-8.7W**) input: 2x10A
Temperature range -40°C to +70°C operational
Dimensions 32x124x117mm WxHxD
Weight 310g, 0.69lb
*) Currents at voltages below 6V
**) Depending on load share function
ORDER NUMBERS
Redundancy YR40.246
Module
Accessory ZM11.SIDE Side mount bracket
MARKINGS
IND. CONT. E
Q.
UL 508
UL 60950-1
Class I Div 2
planned
IECEx ATEX
II 3G Ex nA IIC T4 Gc
planned
Marine
planned
May 2017 / Rev. 1.3 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 [phone] Germany

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
INDEX
Page Page
U1. 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. “Redundancy OK” Relay Contact .......................8
10. “Load Share OK” Relay Contact .........................8
11. Automated Load Sharing....................................9
12. EMC....................................................................10
13. Environment ......................................................11
14. Protection Features ...........................................12
15. Safety Features ..................................................12
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.
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.
AC
DC
AC
DC
Load
+
-
IN 1
OUT
IN 2
May 2017 / Rev. 1.3 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 [phone] Germany
2/19

YR20.246
Y-Series 24-28V, 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.
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.
May 2017 / Rev. 1.3 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 [phone] Germany
3/19

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
3. INPUT AND OUTPUT CHARACTERISTICS
Number of inputs - 2
Number of outputs - 1
Input voltage nom. DC 24-28V ±25%
Input voltage range - 18-35Vdc
Voltage drop, input to output typ. 0.1-0.5V at 2x5A, load share function dependent, see Fig. 3-1
typ. 0.2-0.5V at 2x10A, load share function dependent, see Fig. 3-1
typ. 0.24-0.5V at 2x12A, load share function dependent, see Fig. 3-1
Input current nom. 2x 0-12A continuous, ambient temperature < +45°C
nom. 2x 0-10A continuous, ambient temperature < +70°C
nom. 2x 17A 1) 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
nom. 32.5A for max. 5 seconds
max. 26A in overload /short-circuit (voltage < 6V). Ensure that the
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) 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
V
A
Power
Supply
24V, 12A
+
-
V
A
I 1
I 2
U 1
U 2
Output
4/19
Voltage Drop, typ
0mV
5A 15A
100mV
200mV
300mV
400mV
500mV
20A10A
Output:
2x5A2x2.5A
Input:
2x10A2x7.5A
0
0
600mV
25A
2x12.5A
Input / Output Current
Depending on
Load Share
Regulation 25°C
60°C
I 1 I 2 = U 2 U 1 = Voltage Drop U 1 = U OUT -
A
V
I OUT
U OUT
Variable
Load,
0-24A
YR20.246
Input 1
Input 2
Output
Power
Supply
24V, 12A
+
-
May 2017 / Rev. 1.3 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 [phone] Germany

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
4. POWER LOSSES
Power losses typ. 2.6-4.7W at 2x5A, 25°C ambient temperature
typ.
5.6-8.7W at 2x10A, 25°C ambient temperature
Standby power losses typ. 1.7W at no output current
Fig. 4-1 Power losses Fig. 4-2 Test setup for power loss measurements
Output
V
A
Power
Supply
24V, 12A
+
-
V
A
I 1
I 2
U 1
U 2
A
V
I OUT
U OUT
5/19
Power Losses, typ
0
5A 15A
2W
4W
6W
8W
10W
20A10A
Output:
2x5A2x2.5A
Input:
2x10A2x7.5A
0
0
12W
25A
2x12.5A
Input / Output Current
Depending on
Load Share
Regulation
25°C
60°C
25/
60°C
I 1 I 2 = U 2 U 1 =Losses U 1 = U OUT -
*
I 1 +)(* U 2
*
I 2 I OUT
Variable
Load,
0-24A
YR20.246
Input 1
Input 2
Output
Power
Supply
24V, 12A
+
-
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
Input: 2x5A
Output: 10A
Input: 2x10A
Output: 20A
Lifetime expectancy*) 372 000h *) 182 000h *) at 24V and 40°C
1 053 000h *) 516 000h *) at 24V and 25°C
MTBF**) SN 29500, IEC 61709 2 306 000h 1 954 000h at 24V and 40°C
3 913 000h 3 359 000h at 24V and 25°C
MTBF**) MIL HDBK 217F 964 000h 858 000h Ground Fixed GF40 (24V and 40°C)
1 379 000h 1 226 000h Ground Fixed GF25 (24V and 25°C)
278 000h 243 000h Ground Benign GB40 (24V and 40°C)
381 000h 330 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.
May 2017 / Rev. 1.3 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 [phone] Germany

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
6. TERMINALS AND WIRING
Input and Output Signals
Type Screw termination
IP20 Finger safe construction.
Suitable for field installation.
Push-in terminals
Solid wire max. 6mm2max. 1.5mm2
Stranded wire max. 4mm2max. 1.5mm2
American Wire Gauge 20-10 AWG AWG 24-16
Max. wire diameter 2.8mm (including ferrule) max. 1.6mm (including ferrules)
Wire stripping length 7mm / 0.28inch 7mm / 0.28inch
Screwdriver 3.5mm slotted or Pozidrive No 2 not required
Recommended tightening torque 0.8Nm, 7lb.in not applicable
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.
7. FUNCTIONAL DIAGRAM
Fig. 7-1 Functional diagram
+
-
+
-
Input 1
Control
Control
Input 2
Redundancy OK
Contact
Redundancy
OK
+
-
Chassis
Ground
Output
Load Share
OK
13
14
23
24
Load Share OK
Contact
Load Share
Controller
5A
10A Output current
alarm threshold
20A
Input 2Input 1
OK
Output current < I N
Redundancy OK
Controller Redundancy OK
Input
Voltages
Monitor Output Current
Monitor
May 2017 / Rev. 1.3 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 [phone] Germany
6/19

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
8. FRONT SIDE AND USER ELEMENTS
Fig. 8-1 Front side
AOutput terminals (screw terminals)
BChassis-Ground terminal
Connection of the chassis is optional and not required since the unit fulfils the
requirements according to protection class III.
CInput terminals for input 1 (screw terminals)
DInput terminals for input 2 (screw terminals)
ESelector for output current warning threshold
If the output current increases, e. g. due to additionally loads, and exceeds the
nominal current of one power supply unit, redundancy is no longer guaranteed.
To avoid the loss in redundancy, the output current is monitored and is
reported through LEDs and relay contacts when exceeding the predefined
value.
- Set the selector to 5A in combination with two 5A power supplies (1+1 red.)
- Set the selector to 10A in combination with two 10A power supplies (1+1 red.)
- Set the selector to 20A for n+1 redundant systems. With this setting,
redundancy cannot be checked by the redundancy module any more.
Exceeding the current by less than 2 seconds will be ignored.
FGreen LED “Output current < IN”
The LED is on solid when the output current is smaller than the adjusted value
of the output current alarm selector (E).
GLoad share LEDs
The three LEDs indicate the status of the load sharing between the two power
supplies.
See chapter 11 for detailed description.
HGreen LED “Redundancy OK”
The LED is on solid when no errors are detected.
Errors:
- One or both input voltages are out of range (below 22V or above 30V).
- Output current is higher than the adjusted value of the output current
threshold setting.
- Internal defect is detected
IRelay contact “Redundancy OK” (push-in terminals)
The relay contact is closed when no redundancy errors are detected. The relay
contact is also synchronized with the “Redundancy OK” LED.
See chapter 9for contact ratings.
JRelay contact “Load share OK” (push-in terminals)
The relay contact is closed when the output voltage of the two power supplies
are sufficiently adjusted.
Deviations less than 2s will be ignored.
See chapter 11 for detailed description.
See chapter 10 for contact ratings.
May 2017 / Rev. 1.3 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 [phone] Germany
7/19

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
9. “REDUNDANCY OK” RELAY CONTACT
This feature reports the loss of redundancy by opening the relay contact (pin 23 and 24).
Contact is closed When no errors are detected
Contact is open When:
- one or both input voltages are below 22Vdc or above 30Vdc.
- the output current is higher than the adjusted value of the output current threshold setting.
- an internal defect of the redundancy module is detected (decoupling measures and several
internal test routines).
Input voltage errors less than 2s will be ignored.
Overcurrent errors (less than 150% of the adjusted value) less than 4s will be ignored.
Overcurrent errors (above 150% of the adjusted value) less than 30ms will be ignored.
Internal errors less than 10s will be ignored
Contact ratings max. 60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A resistive load
min. 1mA at 5Vdc minimum permissible load
Isolation voltage See dielectric strength table in section 16.
10. “LOAD SHARE OK” RELAY CONTACT
This feature monitors if the output voltages of the two power supplies connected to the input are sufficiently adjusted
for an even current distribution. The relay contact (pin 13 and 14) is closed, when load sharing occurs.
Contact is closed When the adjustment of the output voltages are sufficient
Contact is open When an even load share does not occur and readjustment of the output voltages is
recommended.
Details see chapter 11.
Contact ratings max. 60Vdc 0.3A, 30Vdc 1A, 30Vac 0.5A resistive load
min. 1mA at 5Vdc minimum permissible load
Isolation voltage See dielectric strength table in section 16.
May 2017 / Rev. 1.3 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 [phone] Germany
8/19

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
11. AUTOMATED LOAD SHARING
Drawing even current from both power supplies in a redundancy application can provide a longer service life of the
redundant power supply system. An evenly shared current can avoid that one of the two units is getting much hotter
than the other, which reduces the lifetime of the power supply system. The YR20.246 redundancy module is equipped
with an automated load share feature, which can compensate a certain voltage unbalance between the two power
supplies connected to the inputs.
However, to reduce the losses of the active circuit in the redundancy module, the individual output voltages shall be
set as close as possible. The three LEDs on the front of the unit help to indicate if adjustment is necessary.
Fig. 11-1 Load sharing
typ. 90mV
typ. 370mV
Input 1
Input 2
OK
+
+
Input 1
Input 2
OK
+
+
Input 1
Input 2
OK
+
+
Input 1
Input 2
OK
+
+
Input 1
Input 2
OK
+
+
Automated load sharing possible Automated load sharing not possible
9/19
"Load Share OK" contact is closed "Load Share OK" contact is open
To optimize power losses, reduce the output voltage
of the power supply, where the yellow LED is on.
V
OUT1
> V
OUT2
V
OUT1
< V
OUT2
V
OUT1
= V
OUT2
typ. 370mV
typ. 90mV
Input 1
Input 2
OK
+
+
Reduce output voltage
of power supply 1
Reduce output voltage
of power supply 2
Optimal load sharing and
minimal power losses
The active load share feature of the YR20.246 has a similar effect and benefit as the feature “Parallel Mode” (soft
output characteristic), which is available on larger PULS power supplies.
May 2017 / Rev. 1.3 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 [phone] Germany

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
12. 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 According to generic standards: EN 61000-6-1 and EN 61000-6-2
Electrostatic discharge EN 61000-4-2 Contact discharge
Air discharge
8kV
15kV
Criterion A
Criterion A
Electromagnetic RF field EN 61000-4-3 80MHz-2.7GHz 10V/m Criterion A
Fast transients (Burst) EN 61000-4-4 Input lines
Output lines
Redundancy OK signal 2)
Load share OK signal 2)
2kV
2kV
2kV
2kV
Criterion A
Criterion A
Criterion A
Criterion A
Surge voltage on input
lines
EN 61000-4-5 + Æ-
+/-ÆChassis ground
500V
1kV
Criterion A
Criterion A
Surge voltage on output
lines
EN 61000-4-5 + Æ-
+/-ÆChassis ground
500V
1kV
Criterion A
Criterion A
Surge voltage on signal
lines
EN 61000-4-5 Load Share OK signalÆPE
Redundancy OK signal
1kV
1kV
Criterion A
Criterion A
Conducted disturbance EN 61000-4-6 0.15-80MHz 20V Criterion A
Power-frequency magnetic
field 1)
EN 61000-4-8 50Hz 30A/m 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. hall
elements, electrodynamic microphones, etc.
2) Tested with capacitive coupling clamp.
EMC Emission According to generic standards: EN 61000-6-3 and EN 61000-6-4
Conducted emission
input lines
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1 limits for DC power ports according
EN 61000-6-3 fulfilled 3) 4)
Conducted emission
output lines
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1 limits for DC power ports according
EN 61000-6-3 fulfilled 3) 4)
Radiated emission EN 55011, EN 55022 Class B 4)
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:
3) For information only, not mandatory for EN 61000-6-3.
4) Provided, that power sources connected on the inputs fulfill the requirements too.
Switching frequency
The internal auxiliary supply is generated with a boost converter.
The switching frequency varies from 140kHz to 500kHz depending on the input voltage.
May 2017 / Rev. 1.3 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 [phone] Germany
10/19

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
13. ENVIRONMENT
Operational temperature *) -40°C to +70°C (-40°F to 158°F)
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***) 2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g
2 hours / axis
IEC 60068-2-6
Shock***) 30g 6ms, 20g 11ms
3 bumps / direction, 18 bumps in total
IEC 60068-2-27
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,
see Fig. 13-2
Altitude de-rating 1.25A/1000m or 5°C/1000m > 2000m (6500ft), see Fig. 13-2
Over-voltage category not applicable The concept of the overvoltage category is
used for equipment energized directly from
the low voltage mains (IEC 60664-1 §4.3.3.2.1).
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
use in paint shops.
*) 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. 13-1 Output current vs. ambient temp. Fig. 13-2 Output current vs. altitude
Allowed Output Current
0
Allowed Output Current
0
11/19
-40 0 20 45 70°C
5
10
15
20
24
32.5A
-25
normalmode
Ambient Temperature
shortterm(<5s)
0 2000 4000 6000m
5
10
15
20
24
32.5A
normalmode
Altitude
A... Tamb < 45°C
B... Tamb < 70°C
A
B
shortterm(<5s)
May 2017 / Rev. 1.3 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 [phone] Germany

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
14. PROTECTION FEATURES
Output over-current protection not included
Reverse input polarity
protection
included unit does not start when input voltage is reversed
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
15. 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
16. 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
and signal terminals together before conducting the test.
When testing, set the cut-off current settings to the value in the table below.
Fig. 16-1 Dielectric strength
A B
12/19
Type test 60s 500Vac 500Vac
Factory test 5s 500Vac 500Vac
Field test 5s 500Vac 500Vac
Cut-off current setting > 2mA > 2mA
B
A
Load Share OK,
Redundancy OK
ChassisIn- / Output
-
+
B
May 2017 / Rev. 1.3 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 [phone] Germany

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
17. APPROVALS
EC Declaration of Conformity
The CE mark indicates conformance with the
- EMC directive and the
- ATEX directive (planned).
CB Scheme,
Information Technology Equipment
IEC 60950-1
UL 508
IND. CONT. EQ.
Listed for use as Industrial Control Equipment;
U.S.A. (UL 508) and Canada (C22.2 No. 107-1-01);
E-File: E198865
UL 60950-1 Recognized for use as Information Technology Equipment,
Level 5; U.S.A. (UL 60950-1) and Canada (C22.2 No. 60950);
E-File: E137006
ANSI / ISA 12.12.01-2007
Class I Div 2,
planned
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: T.B.D.
The redundancy module must be built-in in an IP54 enclosure.
ATEX
EN 60079-0, EN 60079-15,
planned
II 3G Ex nA IIC T4 Gc
Suitable for use in Category 3 Zone 2 locations.
Number of IECEx certificate: T.B.D.
IECEx
IEC 60079-0, IEC 60079-15,
planned IECEx
Ex nA nC IIC T4 Gc
Marine,
planned
GL (Germanischer Lloyd) classified
Environmental category: C, EMC1
Marine and offshore applications
EAC TR Registration
Registration for the Eurasian Customs Union market
(Russia, Kazakhstan, Belarus)
18. ROHS, REACH AND OTHER FULFILLED STANDARDS
RoHS Directive
Directive 2011/65/EU of the European Parliament and the
Council of June 8th, 2011 on the restriction of the use of
certain hazardous substances in electrical and electronic
equipment.
REACH Directive Directive 1907/2006/EU of the European Parliament and the
Council of June 1st, 2007 regarding the Registration,
Evaluation, Authorisation and Restriction of Chemicals
(REACH)
May 2017 / Rev. 1.3 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 [phone] Germany
13/19

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
19. 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 310g / 0.69lb
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. 19-1 Front view Fig. 19-2 Side view
May 2017 / Rev. 1.3 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 [phone] Germany
14/19

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
20. ACCESSORIES
20.1. ZM11.SIDE -SIDE MOUNTING BRACKET
This bracket is used to mount the YR20.246 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.
Fig. 20-1
Side mounting without DIN-
rail brackets
Fig. 20-2
Side mounting with DIN-rail
brackets
Fig. 20-3
Mounting Dimensions
Side mounting bracket
May 2017 / Rev. 1.3 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 [phone] Germany
15/19

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
21. APPLICATION NOTES
21.1. USING ONLY ONE INPUT INSTEAD OF BOTH CHANNELS
Using only one input instead of both is allowed up to a nominal input current of 12A (at max. +45°C ambient
temperature) or 10A (at max. +70°C ambient temperature).
The load share feature is disabled in cases one input voltage is not present or the level of the input voltage is below a
certain value. The MOSFET will be on in such cases.
However, it is always recommended to connect both input path in parallel for reduced power losses and voltage drop.
When this is not possible, the following values can be expected:
Voltage drop, input to output typ. 0.15V at 1x10A, 25°C, see Fig. 21-1
Power losses typ. 2.6W at 1x10A, 25°C, see Fig. 21-3
Standby power losses typ. 1.1W
Fig. 21-1 Input to output voltage drop when only one
input is used Fig. 21-2 Test setup for voltage drop measurements
16/19
Voltage Drop, typ.
0mV
2.5A 7.5A
50mV
100mV
150mV
10A5A0
200mV
12.5A
Input/ Output Current
25°C
60°C
Voltage Drop U 1 = U OUT -
V
A
Power
Supply
24V, 12A
+
-
I
1
U 1
Output
A
V
I OUT
U OUT
Variable
Load,
0-12A
YR20.246
Input 1 Output
Input 2
Fig. 21-3 Power losses when only one input is used Fig. 21-4 Test setup for power loss measurements
Power Losses, typ
Losses U 1 = U OUT -
*
I 1
*
I OUT
Output
0
2.5A 7.5A
1W
2W
3W
10A5A0
4W
12.5A
Output Current
25°C
60°C
V
A
I 1
U 1
A
V
I OUT
U OUT
YR20.246
Variable
Load,
0-12A
Input 1
Input 2
Output
Power
Supply
24V, 12A
+
-
May 2017 / Rev. 1.3 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 [phone] Germany

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
21.2. 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 functional 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.
21.3. INDUCTIVE AND CAPACITIVE LOADS
The unit is designed to supply any kind of loads, including unlimited capacitive and inductive loads.
21.4. 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).
0mm0mm
Load
Power
Supply
Input
Output
+
-
YR20.246
Redundancy
Module
Output
+
-
IN 2
+
-
IN 1
+
-
Power
Supply
Input
Output
+
-
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.
May 2017 / Rev. 1.3 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 [phone] Germany
17/19

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
21.5. 1+1 REDUNDANCY UP TO 10A
1+1 Redundancy up to 10A requires two 10A power supplies and one YR20.246 redundancy module.
Fig. 21-5 Wiring diagram, 1+1 Redundancy, 10A output current
18/19
10A
Load
Load
Share
Warning
I
optional
Power
Supply
24V,10A
++
--
LNPE
Output
Input
I
YR20.246
Redundancy
Module
Output
1
Input 2
Input
++
--
+
-
Load Share
OK
o
o
Redudnadcy
OK
o
o
Failure
Monitor
Power
Supply
24V,10A
++
--
LNPE
Output
Input
L
N
PE
Note: Use separate mains systems for each power supply whenever it is possible
May 2017 / Rev. 1.3 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 [phone] Germany

YR20.246
Y-Series 24-28V, 20A, DUAL REDUNDANCY MODULE
May 2017 / Rev. 1.3 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 [phone] Germany
21.6. 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. 21-6
Mounting
Orientation A
(Standard
orientation)
Redundancy
Module
INPUT
Output Current
0
20 30 40 50 70°C
6
12
18
24A
60
A1
Ambient Temperature
OUTPUT
Fig. 21-7
Mounting
Orientation B
(Upside down)
Redundancy
Module
Output Current
0
20 30 40 50 70°C
6
12
18
24A
60
A1
Ambient Temperature
INPUT
OUTPUT
Fig. 21-8
Mounting
Orientation C
(Table-top
mounting)
Output Current
0
20 30 40 50 70°C
6
18
24A
60
12
A1
A2
Ambient Temperature
Fig. 21-9
Mounting
Orientation D
(Horizontal cw)
Redundancy
Module
INPUT
OUTPUT
Output Current
0
20 30 40 50 70°C
6
18
24A
60
12
A1
A2
Ambient Temperature
Fig. 21-10
Mounting
Orientation E
(Horizontal ccw)
Redundancy
Module
INPUT
OUTPUT
Output Current
0
20 30 40 50 70°C
6
18
24A
60
12
A1
A2
Ambient Temperature
19/19