Q.
PIRD20.241
PIANO-Series
GENERAL DESCRIPTION
The PIRD20.241 is a redundancy module, which can be
used to build 1+1 and N+1 redundant systems. It is
equipped with two input channels, which can be
connected 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 well
as any kind of “hiccup” overload behavior.
The PIRD20.241 is the perfect solution to use in a
redundant system, if the power supply itself is equipped
with a DC-OK signal.
Another application for this redundancy module is to
separate sensitive loads from non-sensitive loads. This
avoids the distortion of the power quality for the
sensitive loads which can cause controller failures.
ORDER NUMBER
Redundancy Module PIRD20.241
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE
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
SHORT-FORM DATA
Input voltage DC 12-28V ±25%
Input voltage
range
Input current 2x 0-10A ambient < +55°C
2x 0-6.25A ambient < +70°C
Output current 0-20A ambient < +55°C
0-12.5A ambient < +70°C
Input to output
voltage drop
Power losses 0W at no load
typ. 4.6W input: 2x5A
typ. 11.2W input: 2x10A
Temperature range -40°C to +70°C operational
Derating 0.5A/°C +55 to +70°C
Dimensions 39x124x124mm WxHxD
Weight 280g / 0.62lb
9-35Vdc
26A at cont. overload/
typ. 0.46V
typ. 0.56V
short circuit
input: 2x5A
input: 2x10A
MARKINGS
IND. CONT. E
UL 508
Jan. 2017 / Rev. 2.0 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
UL 60950-1
EMC
1/15
PIRD20.241
PIANO-Series
DC 12-28V, 20A, DUAL INPUT 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
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.
14. Approvals.......................................................... 11
15. RoHS, REACH and Other Fulfilled Standards .. 11
16. Physical Dimensions and Weight ..................... 12
17. Application Notes............................................. 13
17.1. Using Only One Input Instead of Both
Channels...............................................................13
17.2. Recommendations for Redundancy.........13
17.3. Inductive and Capacitive Loads................14
17.4. Use in a Tightly Sealed Enclosure ............14
17.5. Example: Redundancy for Controls .........14
17.6. Example: 1+1 Redundancy up to 10A......15
17.7. Example: 1+1 Redundancy up to 20A......15
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, which are allowed to
be connected in parallel for higher output
currents, 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.
Ensure that the utilized power supplies are allowed to be connected in parallel to increase the
output power.
ACDCACDCACDCACDCACDCAC
IN 1
IN 2 IN 1
OUT
N+1
Redundancy
OUT
-
+
Load
IN 2 IN 1
OUT
IN 2
DC
1+1
Redundancy
ACDCAC
IN 1
OUT
+
Load
IN 2
-
DC
Jan. 2017 / Rev. 2.0 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
2/15
PIRD20.241
PIANO-Series
DC 12-28V, 20A, DUAL INPUT 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.
Do not energize with wrong input polarity. Device might get damaged.
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 top and the output terminals on the
bottom of the unit.
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).
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.
Jan. 2017 / Rev. 2.0 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
3/15
PIRD20.241
PIANO-Series
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE
3. INPUT AND OUTPUT CHARACTERISTICS
Number of inputs - 2
Number of outputs - 1
Input voltage nom. DC 12-28V ±25%
Input voltage range - 9-35Vdc
Voltage drop, input to output typ. 0.46V at 2x5A, see Fig. 3-1
typ. 0.56V at 2x10A, see Fig. 3-1
Input current nom. 2x 0-10A continuous
nom. 2x 10-16A for 5 seconds
Peak input current max. 1000A for maximal 10ms per input
Output current nom. 20A continuous
nom. 20-32A for 5 seconds
max.
26A *) at continuous overload or short circuit
Reverse current max. 4mA per input, -40°C to +70°C
Reverse voltage max. 45Vdc 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 power
source can deliver more than 26A together, use an appropriate fuse on the output.
Fig. 3-1 Input to output voltage drop Fig. 3-2 Test setup for voltage drop measurements
Voltage Drop, typ.
600mV
500mV
400mV
300mV
200mV
100mV
Output:
Input:
0
0
A
Input, Output Current
B
5A 15A 20A10A
2x5A2x2.5A
.
A
.
5
2
.
°
C
B
.
0
6
.
.
°
C
2x10A2x7.5A
PIC120.241x or
PIC240.241x
24V, 5A or
24V, 10A
PIC120.241x or
PIC240.241x
24V, 5A or
24V, 10A
I1I2=
PIRD20.241
I
1
A
+
-
+
-
Input 1
V
U
1
I
2
A
Input 2
V
U
2
U2U1= Voltage Drop
Output
Variable
Load,
I
OUT
0-20A
A
Output
V
U
OUT
U1=
U
OUT
-
Jan. 2017 / Rev. 2.0 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
4/15
PIRD20.241
PIANO-Series
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE
4. POWER LOSSES
Power losses
typ.
typ.
Fig. 4-1 Power losses at 25°C
Power Losses, typ.
12W
10
8
6
4
2
0
0510
Output Current
0W at no load (stand-by)
4.6W at 24V and 2x5A input current
11.2W
at 24V and 2x10A input current
20A15
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
*) min. 113 000h 309 000h
min. 320 000h*) 874 000h*) at 24V and 25°C
MTBF
**) SN 29500, IEC 61709 7 837 000h 20 310 000h at 24V 40°C
19 408 000h 46 382 000h at 24V 25°C
MTBF
**) MIL HDBK 217F 1 774 000h 1 817 000h at 24Vand 40°C (Ground Fixed GF40)
2 709 000h 2 782 000h at 24Vand 25°C (Ground Fixed GF25)
3 675 000h 3 707 000h at 24Vand 40°C (Ground Benign GB40)
5 620 000h 5 674 000h 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 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.
N+1
Redundancy
Input: 2x10A
Output: 20A
1+1
Redundancy
Input: 2x5A
Output: 10A
*)
at 24V and 40°C
Jan. 2017 / Rev. 2.0 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
5/15
PIRD20.241
PIANO-Series
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE
6. TERMINALS AND WIRING
The terminals are IP20 finger safe constructed and suitable for field- and factory wiring.
Type
Solid wire max. 6mm2
Stranded wire max. 4mm2
American Wire Gauge AWG20-10
Max. wire diameter 2.8mm (including ferrules)
Wire stripping length 7mm / 0.28inch
Screwdriver 3.5mm slotted or cross-head No 2
Recommended tightening torque 1Nm, 9lb.in
Instructions:
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.
screw terminals
7. FUNCTIONAL DIAGRAM
+
Input 1
-
+
Input 2
-
Fig. 7-1 Functional diagram
Surge
Protection
Surge
Protection
Surge
Protection
+
Output
+
-
Jan. 2017 / Rev. 2.0 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
6/15
PIRD20.241
PIANO-Series
8. FRONT SIDE AND USER ELEMENTS
Fig. 8-1 Front side
Output terminals
A
Two identical (+) poles.
B Input terminals for input 1 and input 2
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE
Jan. 2017 / Rev. 2.0 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
7/15
PIRD20.241
PIANO-Series
DC 12-28V, 20A, DUAL INPUT 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
Air discharge 15kV Criterion A
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 EN 61000-4-5
Surge voltage on output lines EN 61000-4-5
Conducted disturbance on
input lines
Conducted disturbance on
output lines
Power-frequency magnetic
1)
field
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 4)
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.
4) The redundancy module incorporates only diodes and no RF-generating circuits and does not contribute to EMC emissions.
According to generic standards: EN 61000-6-1 and EN 61000-6-2
8kV Criterion A
on indirect coupling plane
Output lines
+ Æ +/- Æ earthed DIN-rail
+ Æ +/- Æ earthed DIN-rail
2kV
2kV
500V Criterion A
1kV Criterion A
500V Criterion A
1kV Criterion A
Criterion A
Criterion A
EN 61000-4-6 0.15-80MHz 20V Criterion A
EN 61000-4-6 0.15-80MHz 20V Criterion A
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 EN
61000-6-3 fulfilled
IEC/CISPR 16-1-2, IEC/CISPR 16-2-1 limits for DC power ports according EN
61000-6-3 fulfilled
3)
2) 3)
2) 3)
Jan. 2017 / Rev. 2.0 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
8/15
PIRD20.241
PIANO-Series
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE
10. ENVIRONMENT
Operational temperature
Output de-rating 0.5A/°C +55 to +70°C (140°F to 158°F), see Fig. 10-1
Storage temperature -40 to +85°C (-40°F to 185°F) For storage and transportation
Humidity
2)
5 to 95% r.H. IEC 60068-2-30
Vibration sinusoidal
3)
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
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 IEC 62103, EN 62477-1, not conductive
LABS compatibility The unit does not release any silicone or other LABS-critical substances and is suitable for
1) Operational temperature is the same as the ambient temperature and is defined as the air temperature 2cm below the unit.
2) Do not energize while condensation is present
3) 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
30A
o
v
r
l
e
o
d
a
/
25
20
n
o
r
m
m
l
a
15
o
10
A
T
.
.
.
m
5
0
a
B
.
T
.
.
m
a
0 2000 4000
1)
-40°C to +70°C (-40°F to 158°F) Reduce output power above +60°C
3)
2-17.8Hz: ±1.6mm
17.8-500Hz: 2g
2 hours / axis
3 bumps / direction
18 bumps in total
use in paint shops.
s
h
o
r
t
c
i
r
c
t
u
i
d
e
b
<
°
5
5
C
b
<
°
C
0
7
A
B
Altitude
6000m
IEC 60068-2-6
IEC 60068-2-27
temperature, 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
30A
o
v
r
l
e
o
d
a
s
h
/
o
r
t
c
i
r
c
t
u
25
i
20
n
o
r
m
m
l
a
o
d
15
e
10
A
T
.
.
.
m
a
b
<
°
5
5
5
B
.
T
.
.
0
a
C
b
m
<
°
C
0
7
0 2000 4000
B
A
B
Altitude
6000m
Jan. 2017 / Rev. 2.0 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
9/15
PIRD20.241
PIANO-Series
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE
11. PROTECTION FEATURES
Output over-current protection not included
Reverse input polarity protection not included Wrong input polarity might damage the device.
Degree of protection IP 20 EN/IEC 60529
Over-temperature protection not included
Input transient protection included see chapter 9 for details and values
Output transient protection included see chapter 9 for details and values
Internal input fuse not included
12. SAFETY FEATURES
Input / output separation no galvanic separation Schottky diode 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
13. DIELECTRIC STRENGTH
Not applicable (plastic housing and no galvanic isolation)
Jan. 2017 / Rev. 2.0 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
10/15
PIRD20.241
PIANO-Series
14. APPROVALS
EC Declaration of Conformity
IEC 60950-1
UL 508
UL 60950-1
EAC TR Registration
IND. CONT. EQ.
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE
The CE mark indicates conformance with the EMC 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
Registration for the Eurasian Customs Union market
(Russia, Kazakhstan, Belarus)
15. ROHS, REACH AND OTHER FULFILLED STANDARDS
RoHS Directive
REACH Directive
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,
Jan. 2017 / Rev. 2.0 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
11/15
PIRD20.241
PIANO-Series
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE
16. PHYSICAL DIMENSIONS AND WEIGHT
Width 39mm 1.54’’
Height 124mm 4.88’’
Depth 124mm 4.88’’
The DIN-rail height must be added to the unit depth to calculate the total required
installation depth.
Weight 280g / 0.62lb
DIN-Rail Use 35mm DIN-rails according to EN 60715 or EN 50022 with a height of 7.5 or 15mm.
Plastic Material of Housing Flame retardant Polycarbonate (PC) - UL94-V0
Vicat softening temperature specified with 149°C according to ASTM D1525
Installation Clearances See chapter 2
Fig. 16-1 Front view Fig. 16-2 Side view
Jan. 2017 / Rev. 2.0 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
12/15
PIRD20.241
PIANO-Series
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE
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. 585mV at 1x10A, 25°C, see Fig. 17-1
typ. 645mV at 1x20A, 25°C, see Fig. 17-1
Power losses
typ.
typ.
0W
5.85W
12.9W
at 0A, 25°C
at 10A, 25°C
at 20A, 25°C
Fig. 17-1 Input to output voltage drop
when only one input is used
Voltage Drop, typ.
700mV
600mV
500mV
400mV
300mV
200mV
Input, Output Current
5A 15A 20A10A0
A
B
.
A
5
2
.
.
°
C
B
.
0
6
.
.
°
C
Fig. 17-2 Test setup for voltage drop measurements
PIC480.241
24V, 20A
+
-
Input 2
must not
used
V
1
I
A
U
1
PIRD20.241
Input 1
Input 2
Output
Variable
Load,
I
OUT
0-20A
A
Output
Voltage Drop
V
U
OUT
U1=
U
-
OUT
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.
Jan. 2017 / Rev. 2.0 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
13/15
PIRD20.241
PIANO-Series
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE
17.3. INDUCTIVE AND CAPACITIVE LOADS
The 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 be
higher 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: Rittal Typ IP66 Box PK 9516 100, plastic, 110x180x165mm
Load: 24V, 16A; (=80%) load is placed outside the box
Input: 2x 24Vdc, 8A
Temperature inside enclosure: 42.4°C (in the middle of the right side of the power supply with a distance of 2cm)
Temperature outside enclosure: 23.1°C
Temperature rise: 19.3K
17.5. EXAMPLE: REDUNDANCY FOR CONTROLS
The 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 and
sensitive loads. The power supply for the demanding loads can be used as a redundant source to supply the controls.
Traditional approach:
PS2
LoadPS1
PLC
Improved approach:
PS1
PS2
PIRD20
Load
PLC
Jan. 2017 / Rev. 2.0 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
14/15
PIRD20.241
PIANO-Series
DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE
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.
Note: Use separate mains systems for each power supply whenever it is possible
Fig. 17-3 Wiring diagram, 1+1 Redundancy, 10A output current
Failure
Monitor
L
N
PE
+ +
- -
24-28V
DC-OK
DCOK
PIC240.24x
Power Supply
L N PE
I
+ +
- -
IN
1
PIRD20.241
Redundancy
Module
OUT
IN
2
+ + -
+ +
- -
24-28V
DC-OK
DCOK
PIC240.24x
Power Supply
L N PE
I
24V, 10A
Load
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.
Note: Use separate mains systems for each power supply whenever it is possible
Fig. 17-4 Wiring diagram, 1+1 Redundancy, 10A output current
optional for reduced power losses
L
N
PE
+ +
- -
24-28V
DC-OK
DCOK
PIC480.24x
Power Supply
L N PE
I
+ +
- -
IN
1
PIRD20.241
Redundancy
Module
OUT
IN
2
+ + -
+ +
- -
24-28V
DC-OK
DCOK
PIC480.24x
Power Supply
L N PE
I
+ +
- -
IN
1
PIRD20.241
Redundancy
Module
OUT
IN
2
+ + -
Failure
Monitor
24V, 20A
Load
Jan. 2017 / Rev. 2.0 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
15/15
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