PIRD20.241 PULS | Alldatasheet
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PIRD20.241 PIANO-Series 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 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 perfe ct solution to use in a redundant system, if the power supply itself is equipped with a DC-OK signal. Another application for th is redundancy module is to separate sensitive loads fro m non-sensitive loads. This avoids the distortion of the power quality for the sensitive loads which can cause controller failures. SHORT-FORM DATA Input voltage DC 12-28V ±25% Input voltage range 9-35Vdc 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 26A at cont. overload/ short circuit Input to output voltage drop typ. 0.46V typ. 0.56V input: 2x5A input: 2x10A 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 ORDER NUMBER Redundancy Module PIRD20.241 MARKINGS IND. CONT. EQ. UL 508 planned UL 60950-1 planned EMC Sep. 2016 / Rev. 1.0 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 www.pulspower.com Phone +49 89 9278 0 Germany
PIRD20.241 PIANO-Series DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE INDEX Page Page 15. RoHS, REACH and Other Fulfilled Standards .. 11 17.1. Using Only One Input Instead of Both 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. 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. N+1 Redundancy 1+1 Redundancy AC DC AC DC AC DC AC DC AC DC AC DC IN 1 OUT IN 2 IN 1 OUT IN 2 IN 1 OUT IN 2 Load+ - AC DC AC DC Load+ - IN 1 OUT IN 2 Sep. 2016 / Rev. 1.0 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 www.pulspower.com Phone +49 89 9278 0 Germany
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. 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). WARNING Risk of electrical shock, fire, personal injury or death. - Turn power off before working on the devi ce. 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 wh ere moisture or condensation can be expected. - Do not touch during power-on and immediately after power-off. Hot surfaces may cause burns. Sep. 2016 / Rev. 1.0 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 www.pulspower.com Phone +49 89 9278 0 Germany
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 t he 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. 100mV 200mV 300mV 400mV 500mV 600mV 5A 15A 20A10AOutput: 2x5A2x2.5AInput: 2x10A2x7.5A Input, Output Current A... 25°C B... 60°C A B V A PIC120.241x or PIC240.241x 24V, 5A or 24V, 10A V A I1 I2= U2U1 = Voltage Drop U1= UOUT- Output A V IOUT UOUT Variable Load, 0-20A PIRD20.241 Input 1 Input 2 Output PIC120.241x or PIC240.241x 24V, 5A or 24V, 10A Sep. 2016 / Rev. 1.0 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 www.pulspower.com Phone +49 89 9278 0 Germany
PIRD20.241 PIANO-Series DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE 4. POWER LOSSES Power losses 0W at no load (stand-by) typ. 4.6W at 24V and 2x5A input current typ. 11.2W at 24V and 2x10A input current Fig. 4-1 Power losses at 25°C Power Losses, typ. 05 1 0 12W 20A15 Output Current 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 N+1 Redundancy Input: 2x10A Output: 20A 1+1 Redundancy Input: 2x5A Output: 10A Lifetime expectancy *) min. 113 000h 309 000h*) at 24V and 40°C 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. Sep. 2016 / Rev. 1.0 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 www.pulspower.com Phone +49 89 9278 0 Germany
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 screw terminals 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 c odes and installation regulations! c) Ensure that all strands of a strande d wire enter the terminal connection! d) Unused terminal compartments should be securely tightened. e) Ferrules are allowed. 7. FUNCTIONAL DIAGRAM Fig. 7-1 Functional diagram Input 1 Input 2 Output Surge Protection Surge Protection Surge Protection Sep. 2016 / Rev. 1.0 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 www.pulspower.com Phone +49 89 9278 0 Germany
PIRD20.241 PIANO-Series DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE 8. FRONT SIDE AND USER ELEMENTS Fig. 8-1 Front side A Output terminals Two identical (-) poles for easier grounding of the output. B Input terminals for input 1 and input 2 Sep. 2016 / Rev. 1.0 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 www.pulspower.com Phone +49 89 9278 0 Germany
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 According to generic standards: EN 61000-6-1 and EN 61000-6-2 Electrostatic discharge EN 61000-4-2 Contact discharge on indirect coupling plane 8kV Criterion A 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 Output lines 2kV 2kV Criterion A Criterion A Surge voltage on input lines EN 61000-4-5 + Æ - 500V Criterion A +/- Æ earthed DIN-rail 1kV Criterion A Surge voltage on output lines EN 61000-4-5 + Æ - 500V Criterion A +/- Æ earthed DIN-rail 1kV Criterion A Conducted disturbance on input lines EN 61000-4-6 0.15-80MHz 20V Criterion A Conducted disturbance on output lines EN 61000-4-6 0.15-80MHz 20V Criterion A Power-frequency magnetic field 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 f ields, e.g. hall elements, electrodynamic microphones, etc. EMC Emission 4) 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 2) 3) 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 2) 3) Radiated emission EN 55011, EN 55022 Class B 2) 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) Provided, that power sources connected on the inputs fulfill the class B requirements too. 3) Provided, that power sour ces connected on the inputs fulfill the requirements too. 4) The redundancy module incorporates only diodes and no RF-gen erating circuits and does not contribute to EMC emissions. Sep. 2016 / Rev. 1.0 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 www.pulspower.com Phone +49 89 9278 0 Germany
PIRD20.241 PIANO-Series DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE 10. ENVIRONMENT Operational temperature 1) -40°C to +70°C (-40°F to 158°F) Reduce output power above +60°C +55 to +70°C (140°F to 158°F), see Fig. 10-1Output de-rating 0.5A/°C 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) 2-17.8Hz: ±1.6mm 17.8-500Hz: 2g 2 hours / axis IEC 60068-2-6 Shock 3) 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. 10-2 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 used for equipment energized directly from 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 use in paint shops. 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 wi th a height of 15mm and a thickness of 1.3mm and standard mounting orientation. Allowed Output Current 0 2000 4000 6000m 30A normal mode Altitude overload / short circuit A... Tamb < 55°C B... Tamb < 70°C A B Allowed Output Current 0 2000 4000 6000m 30A normal mode Altitude overload / short circuit A... Tamb < 55°C B... Tamb < 70°C A B B Sep. 2016 / Rev. 1.0 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 www.pulspower.com Phone +49 89 9278 0 Germany
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 included unit does not start when input voltage is reversed 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) Sep. 2016 / Rev. 1.0 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 www.pulspower.com Phone +49 89 9278 0 Germany
PIRD20.241 PIANO-Series DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE 14. APPROVALS EC Declaration of Conformity The CE mark indicates conformance with the EMC directive. CB Scheme, Information Technology Equipment IEC 60950-1 planned UL 508, planned IND. CONT. EQ. Listed for use as Industrial Control Equipment; E-File: E198865 UL 60950-1, planned Recognized for use as Information Technology Equipment, E-File: E137006 EAC TR Registration Registration for the Eurasian Customs Union market (Russia, Kazakhstan, Belarus) 15. 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. 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) REACH Directive Sep. 2016 / Rev. 1.0 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 www.pulspower.com Phone +49 89 9278 0 Germany
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 Sep. 2016 / Rev. 1.0 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 www.pulspower.com Phone +49 89 9278 0 Germany
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 0W at 0A, 25°C typ. 5.85W at 10A, 25°C typ. 12.9W at 20A, 25°C Fig. 17-1 Input to output voltage drop when only one input is used Fig. 17-2 Test setup for voltage drop measurements V A PIC480.241 24V, 20A Voltage Drop U1= UOUT- Output A V IOUT UOUT Variable Load, 0-20A PIRD20.241 Input 1 Input 2 Output Input 2 must not used Voltage Drop, typ. 200mV 300mV 400mV 500mV 600mV 700mV 5A 15A 20A10A0 Input, Output Current A... 25°C B... 60°C A B 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. Sep. 2016 / Rev. 1.0 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 www.pulspower.com Phone +49 89 9278 0 Germany
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%) lo ad is placed outside the box Input: 2x 24Vdc, 8A Temperature inside enclosure: 42.4°C (i n 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: LoadPS1 PLCPS2 Improved approach: Load PLC PS1 PS2 PIRD20 Sep. 2016 / Rev. 1.0 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 www.pulspower.com Phone +49 89 9278 0 Germany
PIRD20.241 PIANO-Series DC 12-28V, 20A, DUAL INPUT REDUNDANCY MODULE Sep. 2016 / Rev. 1.0 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 www.pulspower.com Phone +49 89 9278 0 Germany 17.6. EXAMPLE: 1+1 REDUNDANCY UP TO 10A 1+1 Redundancy up to 10A requires two 10A power supplies and one PIRD20.241 redundancy module. Fig. 17-3 Wiring diagram, 1+1 Redundancy, 10A output current Failure Monitor 24V, 10A Load I I L N PE PIRD20.241 Redundancy Module + - -OUT IN + +- - IN L N PE PIC240.24x Power Supply 24-28V DC-OK DC- OK + + - - L N PE PIC240.24x Power Supply 24-28V DC-OK DC- OK + + - - Note: Use separate mains systems for each power supply whenever it is possible 17.7. EXAMPLE: 1+1 REDUNDANCY UP TO 20A 1+1 Redundancy up to 20A requires two 20A power supplies and two PIRD20.241 redundancy modules. Fig. 17-4 Wiring diagram, 1+1 Redundancy, 10A output current Failure Monitor 24V, 20A Load I I L N PE PIRD20.241 Redundancy Module + - -OUT IN + +- - IN L N PE PIC480.24x Power Supply 24-28V DC-OK DC- OK + + - - L N PE PIC480.24x Power Supply 24-28V DC-OK DC- OK + + - - PIRD20.241 Redundancy Module + - -OUT IN + +- - IN optional for reduced power losses Note: Use separate mains systems for each power supply whenever it is possible