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pird20.241 piano-series dc 12-28v, 20a, d ual i nput r edundancy m odule r edundancy m odule ? 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 -40c and +55c ? width only 39mm ? large screw terminals ? easy wiring: distribution terminal for negative pole included ? 3 year warranty 1/15 g eneral d escription 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 powe r 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. s hort - form d ata input voltage dc 12-28v 25% input voltage range 9-35vdc input current 2x 0-10a ambient < +55c 2x 0-6.25a ambient < +70c output current 0-20a ambient < +55c 0-12.5a ambient < +70c 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 -40c to +70c operational derating 0.5a/c +55 to +70c dimensions 39x124x124mm wxhxd weight 280g / 0.62lb o rder n umber redundancy module pird20.241 m arkings ind. cont. e q. 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, 25c 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, d ual i nput r edundancy m odule i ndex page page 1. intended use .......................................................3 2. installation requirements ...................................3 3. input and output characteristics .......................4 4. power losses ........................................................5 5. lifetime expectancy and mtbf ...........................5 6. terminals and wiring ..........................................6 7. functional diagram .............................................6 8. front side and user elements .............................7 9. emc ......................................................................8 10. environment ........................................................9 11. protection features ...........................................10 12. safety features ..................................................10 13. dielectric strength ............................................10 14. approvals .......................................................... 11 15. rohs, reach and othe r 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 the information given in this document is co rrect to the best of our knowledge and experience at the time of publication. if no t 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 (availa ble 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 disregardi ng 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 im plied preference shall a key word indicating a mandatory requirement should a key word indicating flexibility of choi ce with a strongly pref erred implementation 1+1 redundancy use of two identical power suppl ies in parallel to provide c ontinued 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, wh ich are allowed to be connected in para llel 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 suppl ies are needed in a n+1 redundant system. ensure that the utilized power supplies are allowe d 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, 25c ambient and after a 5 minutes run-in time unless otherwise noted www.pulspower.com phone +49 89 9278 0 germany 2/15
pird20.241 piano-series dc 12-28v, 20a, d ual i nput r edundancy m odule 1. i ntended u se this redundancy module is desi gned for installation in an encl osure and is intended for th e general use such as in industrial control, office, communicati on, and instrumentation equipment. this redundancy module ca n be used with any type of power supply as long as the maximum output current ratings are not exceeded. it is suitable for pow er supplies with constant current over load behavior as well as any kind of hiccup overload behavior. do not use this redundancy module in equipment, where ma lfunction may cause severe pe rsonal injury or threaten human life. 2. i nstallation r equirements this device may only be installed and put into opera tion by qualified personnel. this device does not contain serviceable parts. if damage or malfuncti on should occur during installation or operation, i mmediately 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 recomme nded when the device is loaded permanently with more than 50% of the rated output current. increase the side clearance to 15mm in ca se 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 pel v source (according to iec 62477-1) or an isolated secondary circuit (according to ul 508). warning risk of electrical shock, fi re, personal injury or death. - turn power off before working on the devi ce. protect against inad vertent 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 enteri ng the housing. - do not use in wet locations or in areas wh ere moisture or condens ation 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, 25c ambient and after a 5 minutes run-in time unless otherwise noted www.pulspower.com phone +49 89 9278 0 germany 3/15
pird20.241 piano-series dc 12-28v, 20a, d ual i nput r edundancy m odule 3. i nput and o utput c haracteristics 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, -40c to +70c reverse voltage max. 45vdc voltage applie d 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 20a 10a output: 2x5a 2x2.5a input: 2x10a 2x7.5a 0 0 input, output current a . . . 2 5 c b . . . 6 0 c a b v a pic120.241x or pic240.241x 24v, 5a or 24v, 10a + - v a i 1 i 2 u 1 u 2 i 1 i 2 = u 2 u 1 = voltage drop u 1 = u out - output a v i out u out 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, 25c ambient and after a 5 minutes run-in time unless otherwise noted www.pulspower.com phone +49 89 9278 0 germany 4/15
pird20.241 piano-series dc 12-28v, 20a, d ual i nput r edundancy m odule 4. p ower l osses 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 25c power losses, typ. 0 0510 2 4 6 8 10 12w 20a 15 output current 5. l ifetime e xpectancy and mtbf the redundancy module has two input channels which are completely indepe ndent from each other. the dual input redundancy module can be consid ered as two single redundancy modules comb ined 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 enti re dual input module. if the mtbf numbe r 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 40c min. 320 000h *) 874 000h *) at 24v and 25c mtbf **) sn 29500, iec 61709 7 837 000h 20 310 000h at 24v 40c 19 408 000h 46 382 000h at 24v 25c mtbf **) mil hdbk 217f 1 774 000h 1 817 000h at 24vand 40c (ground fixed gf40) 2 709 000h 2 782 000h at 24vand 25c (ground fixed gf25) 3 675 000h 3 707 000h at 24vand 40c (ground benign gb40) 5 620 000h 5 674 000h at 24vand 25c (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 acc ording to the capacitors 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 m ean t ime b etween f ailure, 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 ev ery 100 hours if 10 000 units ar e installed in the field. how ever, 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, 25c ambient and after a 5 minutes run-in time unless otherwise noted www.pulspower.com phone +49 89 9278 0 germany 5/15
pird20.241 piano-series dc 12-28v, 20a, d ual i nput r edundancy m odule 6. t erminals and w iring the terminals are ip20 finger sa fe constructed and suitable fo r field- and factory wiring. type screw terminals solid wire max. 6mm 2 stranded wire max. 4mm 2 american wire gauge awg20-10 max. wire diameter 2.8mm (including ferrules) wire stripping length 7mm / 0.28inch screwdriver 3.5mm slotte d or cross-head no 2 recommended tightening to rque 1nm, 9lb.in instructions: a) use appropriate copper cables that are designed for minimum operating temperatures of: 75c for ambient up to 55c minimum and 90c for ambient up to 70c 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. f unctional d iagram 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, 25c ambient and after a 5 minutes run-in time unless otherwise noted www.pulspower.com phone +49 89 9278 0 germany 6/15
pird20.241 piano-series dc 12-28v, 20a, d ual i nput r edundancy m odule 8. f ront s ide and u ser e lements 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, 25c ambient and after a 5 minutes run-in time unless otherwise noted www.pulspower.com phone +49 89 9278 0 germany 7/15
pird20.241 piano-series dc 12-28v, 20a, d ual i nput r edundancy m odule 9. emc the redundancy module is suitable for a pplications 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 discha rge 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 + ? - 500v criterion a +/ - ? earthed din-rail 1kv criterion a surge voltage on output lines en 61000-4-5 + ? - 500v criterion a +/ - ? 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 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 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 lim its 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 lim its 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 fo llowing two conditions: (1) this device may not cause ha rmful interference, and (2) this device must accept any interferenc e 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, 25c ambient and after a 5 minutes run-in time unless otherwise noted www.pulspower.com phone +49 89 9278 0 germany 8/15
pird20.241 piano-series dc 12-28v, 20a, d ual i nput r edundancy m odule 10. e nvironment operational temperature 1) -40c to +70c (-40f to 158f) reduce output power above +60c +55 to +70c (140f to 158f), see fig. 10-1 output de-rating 0.5a/c storage temperature -40 to +85c (-40 f to 185f) 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 5c/1000m > 2000m (6500ft), see fig. 10-2 over-voltage category not a pplicable the concept of the overvoltage category is used for equipment energized directly from the low voltage mains (i ec 60664-1 4.3.3.2.1). degree of pollution 2 iec 62103, en 62477-1, not conductive labs compatibility the unit does not re lease any silicone or other labs-criti cal 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 mount ing orientation. fig. 10-1 output current vs. ambient temp. fig. 10-2 output current vs. altitude allowed output current 0 0 2000 4000 6000m 5 10 15 20 25 30a n o r m a l m o d e altitude o v e r l o a d / s h o r t c i r c u i t a . . . t a m b < 5 5 c b . . . t a m b < 7 0 c a b allowed output current 0 0 2000 4000 6000m 5 10 15 20 25 30a n o r m a l m o d e altitude o v e r l o a d / s h o r t c i r c u i t a . . . t a m b < 5 5 c b . . . t a m b < 7 0 c a b b sep. 2016 / rev. 1.0 ds-pird20.241 all parameters are specified at 24v, 20a output current, 25c ambient and after a 5 minutes run-in time unless otherwise noted www.pulspower.com phone +49 89 9278 0 germany 9/15
pird20.241 piano-series dc 12-28v, 20a, d ual i nput r edundancy m odule 11. p rotection f eatures output over-current pr otection 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 protecti on included see chapter 9 for details and values output transient protecti on included see chapter 9 for details and values internal input fuse not included 12. s afety f eatures input / output separation no galvanic separa tion schottky diode between input and output safety level of output voltag e the output voltage is regarded to be se lv (en 60950-1) or pelv (en 60204-1, en 62477-1, iec 60364-4-41) if the input voltage fulfills th e requirements for a selv source or pelv source. class of protection iii 13. d ielectric s trength 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, 25c ambient and after a 5 minutes run-in time unless otherwise noted www.pulspower.com phone +49 89 9278 0 germany 10/15
pird20.241 piano-series dc 12-28v, 20a, d ual i nput r edundancy m odule 14. a pprovals ec declaration of conformity the ce mark indicates conforma nce with the emc directive. cb scheme, information technology equipment iec 60950-1 planned ul 508, planned ind. cont. eq. listed for use as industri al control equipment; u.s.a. (ul 508) and canada (c22.2 no. 107-1-01); e-file: e198865 ul 60950-1, planned recognized for use as information technology equipment, level 5; u.s.a. (ul 60950-1) and canada (c22.2 no. 60950); e-file: e137006 eac tr registration registration for the eurasian customs union market (russia, kazakhstan, belarus) 15. r o hs, reach and o ther f ulfilled s tandards rohs directive directive 2011/65/eu of the european parliament and the council of june 8 th , 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 1 st , 2007 regarding the registration, evaluation, authorisation a nd restriction of chemicals (reach) reach directive sep. 2016 / rev. 1.0 ds-pird20.241 all parameters are specified at 24v, 20a output current, 25c ambient and after a 5 minutes run-in time unless otherwise noted www.pulspower.com phone +49 89 9278 0 germany 11/15
pird20.241 piano-series dc 12-28v, 20a, d ual i nput r edundancy m odule 16. p hysical d imensions and w eight 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 re tardant polycarbonate (pc) - ul94-v0 vicat softening temperature specified with 149c 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, 25c ambient and after a 5 minutes run-in time unless otherwise noted www.pulspower.com phone +49 89 9278 0 germany 12/15
pird20.241 piano-series dc 12-28v, 20a, d ual i nput r edundancy m odule 17. a pplication n otes 17.1. u sing o nly o ne i nput i nstead of b oth c hannels using only one input instead of both is allowed up to a nominal input cu rrent of 20a at max. +55c ambient temperature. however, it is always reco mmended to connect both input path in parallel for re duced 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, 25c, see fig. 17-1 typ. 645mv at 1x20a, 25c, see fig. 17-1 power losses 0w at 0a, 25c typ. 5.85w at 10a, 25c typ. 12.9w at 20a, 25c fig. 17-1 input to output voltage drop when only one input is used fig. 17-2 test setup for vo ltage drop measurements v a pic480.241 24v, 20a + - i 1 u 1 voltage drop u 1 = u out - output a v i out u out 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 20a 10a 0 input, output current a . . . 2 5 c b . . . 6 0 c a b 17.2. r ecommendations for r edundancy r ecommendations for the configurat ion 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 pha ses or mains circuits if possible. - use separate input fuses for each power supply. - set the power supply in parallel-use mo de 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, 25c ambient and after a 5 minutes run-in time unless otherwise noted www.pulspower.com phone +49 89 9278 0 germany 13/15
pird20.241 piano-series dc 12-28v, 20a, d ual i nput r edundancy m odule 17.3. i nductive and c apacitive l oads the unit is designed to supply any kind of loads, in cluding unlimited capaciti ve and inductive loads. 17.4. u se in a t ightly s ealed e nclosure when the redundancy module is installed in a tightly sealed enclosur e, the temperature inside the enclosure will be higher than outside. the inside temperature define s 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: 42.4c (i n the middle of the right side of the pow er supply with a distance of 2cm) temperature outside enclosure: 23.1c temperature rise: 19.3k 17.5. e xample : r edundancy for c ontrols 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 th e demanding loads and another one for the controls and sensitive loads. the power supply for th e demanding loads can be used as a re dundant source to supply the controls. traditional approach: load ps1 plc ps2 improved approach: load plc ps1 ps2 pird20 sep. 2016 / rev. 1.0 ds-pird20.241 all parameters are specified at 24v, 20a output current, 25c ambient and after a 5 minutes run-in time unless otherwise noted www.pulspower.com phone +49 89 9278 0 germany 14/15
pird20.241 piano-series dc 12-28v, 20a, d ual i nput r edundancy m odule sep. 2016 / rev. 1.0 ds-pird20.241 all parameters are specified at 24v, 20a output current, 25c ambient and after a 5 minutes run-in time unless otherwise noted www.pulspower.com phone +49 89 9278 0 germany 17.6. e xample : 1+1 r edundancy 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 2 + + - - in 1 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. e xample : 1+1 r edundancy 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 2 + + - - in 1 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 2 + + - - in 1 optional for reduced power losses note: use separate mains systems for each power supply whenever it is possible 15/15

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