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uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule b uffer m odule ? buffering with electrolytic ca pacitors instead of lead acid batteries ? buffering of 48v loads ? minimum hold-up time 0.1s at 20a, 0.2s at 10a and longer hold-up time at lower loads ? clear status indication by status led and signaling terminals ? quick-connect spri ng-clamp terminals ? 3 years warranty 1/18 g eneral d escription the uf20 buffer module is a supplementary device for regulated dc 48v power supplies, which can be used for various purposes: - deliver dc-power to br idge failures of the dc voltage supply system. - extend the hold-up time after loss of the ac power. - deliver extra short-term peak current above the current rating of the power supply. it utilizes service-free elec trolytic capacitors for storing the energy which allows usage even at ambient temperatures up to +70c. the buffer module does not re quire any control wiring. it can be added in parallel to the load circuit at any given point. buffer modules can be connected in parallel to increase the output ampacity or the hold-up time. s hort - form d ata supply voltage dc 48v -20%/+25% 38.4-60vdc required voltage to charge capacitors 46vdc threshold voltage for buffer mode 45v / v in -2v selectable buffer voltage 45v / v in -2v selectable buffer current 20a charging time typ. 21s current consumption typ. 40ma max. 500ma stand-by mode during charging power dissipation 1.9w stand-by mode buffer time min. 100ms min. 200ms typ. 150ms typ. 300ms typ. 21s at 45v, 20a at 45v, 10a at 45v, 20a at 45v, 10a at 45v, 0.1a temperature range -25c to +70c operational dimensions 64x124x102mm wxhxd weight 740g / 1.63lb o rder n umbers buffer module uf20.481 accessory zm1.wall pane l/ wall-mount bracket zm14.side side-mount bracket m arkings ind. cont. e q. ul 508 ul 60950-1 emc oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany
uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule i ndex page page 1. intended use .......................................................3 2. installation notes ................................................3 3. functional description ........................................4 4. electrical ratings .................................................5 5. selection of the back -up threshold voltage .....6 6. buffer time ..........................................................6 7. charging time .....................................................7 8. operating diagrams ............................................7 9. active signal ........................................................8 10. ready signal ........................................................8 11. inhibit input .........................................................8 12. efficiency and power losses ................................9 13. lifetime expectancy and mtbf ...........................9 14. functional diagram ...........................................10 15. terminals and wiring ....................................... 10 16. front side and user elements .......................... 11 17. emc ................................................................... 12 18. environment ..................................................... 13 19. protection features .......................................... 13 20. safety features ................................................. 13 21. dielectric strength ............................................ 14 22. approvals .......................................................... 14 23. physical dimensions and weight ..................... 15 24. accessories ........................................................ 16 24.1. zm1.wall - wall mounting bracket .......16 24.2. zm14.side - side mounting bracket ........17 25. wiring diagrams ............................................... 18 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. some parts of this unit are patent by puls (us patent no 091662,063, des. 424,529, ). t erminology and a breviations power supply mode describes a condition where th e supply voltage is in the rate d supply voltage range and the supplying power supply can deliver a sufficient amount of current for the buffer module and the load. the mode can also be called normal mode. buffer mode describes a condition where th e input voltage is below the tra nsfer threshold level, the unit is running on capacitors (bufferi ng) and the output is loaded within the allowed limits. the mode can also be called capacitor mode. inhibit mode describes a condition where bu ffering is disabled on purpose (e.g. for service actions). t.b.d. to be defined, value or de scription will follow later. dc 48v a figure displayed with the ac or dc before the value represents a nominal voltage with standard tolerances included. e.g.: dc 12v describes a 12v battery disregardi ng whether it is full (13.7v) or flat (10v). 48vdc 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. oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany 2/18
uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule 1. i ntended u se this device is designed for installati on in an enclosure. use an appropria te enclosure which protects against mechanical, electrical and fire hazards. this device is intended for professi onal use in areas such as in industri al control, office, communication, and instrumentation equipment. do not use this device in equipment or systems where ma lfunction may cause severe pe rsonal injury or threaten human life. 2. i nstallation n otes this device may only be installed and put into opera tion by qualified personnel. this device does not contain serviceable parts or fuses. if damage or malfuncti on should occur during installation or operation, i mmediately turn power off and send unit to the factory for inspection. the unit must be powered from a selv s ource (according to iec 60950-1), pelv source (according to iec 62477-1) or an isolated secondary circuit (acco rding to ul 508) power source. use din-rails according to en 60715 with a height of 7.5 or 15mm. mounting orientation must be power terminals on top of the unit. do not obstruct air flow as the unit is convection cooled . ventilation grid must be kept free of any obstructions. signal lines (ready, active and in hibit) must be shorter than 30m. use an appropriately sized power supply, which can deliver the additional required internal current consumption (including the charging current) specified as input current in the table of chapter 4 and fig. 4-1 . the following installation cleara nces must be maintained: - left / right: 0mm - on top of the unit: 40mm - on bottom of the unit: 20mm agency approvals apply only for altitudes up to 2000m. maximum surrounding air temp erature: +70c / +158f. caution for canada: for use in a controlled environment according to csa 22.2 no 107.1-01. 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 modify or repair the unit. - do not open the unit as dangerous voltages may be present inside. - 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 immediatel y after power-off. hot surfaces may cause burns. oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany 3/18
uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule 3. f unctional d escription working principle when the power supply provides sufficient vo ltage, the buffer module stores energy in the integrated electrolytic capa citors. in case of a voltage dip or loss, this energy is released to the dc bus in a regulated process. dc charge discharge storage ac dc buffer module bridges mains faults without interruption statistic show that 80% of all mains faul t lasts less than 0.2s. these mains faults are completely bridged by the buffer unit up to 10a load current. for higher load currents use multiple buffer modules in parallel. this increases the re liability of the system as a whole. extended hold-up time once mains power fails or is switched off, the buffer unit will continue to provide the load current for a defined period of time. process data can be saved and processes can be terminated before the dc power switches off. controlled restarts are subsequently possible. ac dc buffer module easy to handle, expandable and maintenance-free the buffer module does not requi re any control wiring. it ca n be added parallel to the load circuit at any given point. buffer modules can be connected in parallel to increase the output ampacity or the hold-up time. dc buffer module power supply load ac + - fig. 3-1 typical wiring diagram fig. 3-2 transfer behavior power supply output 4/18 pe l + - n power supply + - load + - buffer module optional buffer mode supply voltage t t transfer threshold power supply mode power supply mode oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany
uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule 4. e lectrical r atings supply voltage nom. dc 48v -20%/+25% supply voltage range 1) nom. 38.4 - 60vdc normal operating voltage range 2) typ. 46 C 60vdc transfer voltage for switching into buffer mode typ. typ. 45vdc v in C 2v back-up threshold jumper set to 45v fixed back-up threshold jumper set to v in C 2v see also chapter 5 . transfer voltage for switching from buffer mode into power supply mode typ. typ. 45vdc v buffer + 2v back-up threshold jumper set to 45v fixed back-up threshold jumper set to v in C 2v see also chapter 5 . buffer voltage typ. same as the transfer voltage for switching into buffer mode. ripple and noise voltage - in buffer mode max. max. max. 250mvpp 400mvpp 600mvpp at 5a generated by the buffer module at 10a generated by the buffer module at 20a generated by the buffer module defined at 20hz to 20mhz, 50ohm - in power supply mode the ripple and noi se voltage is defined by the power supply. current consumption typ. min. max. 40ma 300ma 500ma when capacitor is fully charged during charging of the capacitors during charging of the capacitors power dissipation typ. 1.9w when capacitor is fully charged buffer current min. 20a buffer current overload behavior electronically limited, buffering st ops and capacitor gets discharged below 34v. see fig. 4-2 . allowed voltage between supply voltage and chassis ground max. 60vdc or 42.4vac continuous, iec 62477-1 capacitive and inductive loads no limitation 1) supply voltage range: at voltages within the input voltage range, control functions such as leds, monitoring features, relay contacts, etc. are funct ioning normally. within the input voltage range the unit can either be in power supply mode or in buffer mode. 2) normal operating voltage range: the normal operating voltage rang e describes the supply voltage, which supports the full func tionality of the buffer module (in cluding charging) but without entering the buffer mode. fig. 4-1 selection of an appropriate power supply fig. 4-2 output characteristic in buffer mode, 45v fixed mode, typ. buffer voltage 0 8 16 24 56v 32 40 02 0 5/18 internal current consumption consumption for charging current load current power supply current 12 4 8 16 32a 24 28 output current 48 45v buffering stops below 34v oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany
uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule 5. s election of the b ack - up t hreshold v oltage the buffer behavior can be selected wi th the back-up jumper selector between fixed mode and variable mode. fixed mode: (jumper in position ?2-3 or ?45v fixed) if the supply output voltage falls below 45v, buffering starts and the supply voltage will be kept at this level. this adjustment is recommended: - when power supplies other than the dimension q-series are used - with back-feeding loads - when the buffer module is pl aced close to the load or - whenever in doubt. variable mode: (jumper in position ?1-2 or ?v in C 2v) buffering starts if the supply voltage de creases by more than 2v. buffering e nds when supply voltage increases by more than 2v voltage changes slower than 1.1v/s will be ignored if the voltage is above 45v . below 45v buffering starts immediately. this adjustment is recommended for any application where 45v is too low for the application or when the buffer module is placed close to the power supply. the factory setting is fixed mode, a mi ssing jumper means also fixed mode. 6. b uffer t ime the buffer time (sometimes also calle d autonomy time) is the maximum period of time for which the capacitor can maintain the required output current. the buffer time mainly depends on th e output current in buffer mode. to increase the buffer time any given number of buffer modules can be connecte d in parallel. buffer time min. 100ms at 45v, 20a min. 200ms at 45v, 10a typ. 150ms at 45v, 20a typ. 300ms at 45v, 10a typ. 21s at 45v, 0.1a fig. 6-1 buffer time, typ. fig. 6-2 buffer time for small buffer currents, typ. buffer current, typ. buffer current, typ. 20a 6/18 0 00.3 3s 5 15 10 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.4 0 3 18s buffer time 0.25 0.75 0.5 1.0a 69 12 15 buffer time oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany
uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule 7. c harging t ime charging of the internal capacitors is in dicated by the status led, which is fl ashing with a slow frequency (1.25hz). charging time min. 22s initial charging 1) max. 32s initial charging 1) min. 17s re-charging 2) max. 25s re-charging 2) 1) initial charging is the first charge after voltage is applied to the buffer module. 2) re-charging is the charging of the internal capacitors after voltage interruptions shorter than 2minutes. fig. 7-1 charging time, re-charging charge 20 0 5 10 30s charging time 40 80 60 100% 15 20 25 m a x . m i n . 8. o perating d iagrams fig. 8-1 operating diagram fig. 8-2 signal schematic 7/18 ready t active t optocoupler high ohmic optocoupler high ohmic optocoupler low ohmic optocoupler low ohmic v mains t v buffer capacitor t v out t charging mode led t buffer mode hold-up time power supply standby mode 10hz 1.25hz 8 ready 7 active 6 + 5,1v 3ma 9 inhibit uf20 oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany
uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule 9. a ctive s ignal the signal active (pin 7) is an opto-coupler output wh ich is low ohmic while buffe r capacitors are discharged. wiring scheme see fig. 8-2 , fig. 25-1 and fig. 25-2 . signal voltage max. 60vdc vo ltage between pin 6 and 7 signal current max. 6ma voltage drop across opto-coupler 1.2v / 3.3v at 1ma / 5ma while opto- coupler is low ohmic leakage current max. 50a while opto-coupler is high ohmic isolation voltage see chapter 21 . 10. r eady s ignal the signal ready (pin 8) is an opto-coupler output whic h is low ohmic when buffer ca pacitors are fully charged. wiring scheme see fig. 8-2 , fig. 25-1 and fig. 25-2 . signal voltage max. 60vdc vo ltage between pin 6 and 7 signal current max. 6ma voltage drop across opto-coupler 1.2v / 3.3v at 1ma / 5ma while opto- coupler is low ohmic leakage current max. 50a while opto-coupler is high ohmic isolation voltage see chapter 21 . 11. i nhibit i nput buffering can be disabled or in terrupted with the inhibit input (pin 9). th erefore, pin 6 should be connected to the positive pole of the terminal voltage or to the extern al control voltage and pin 9 must be connected to the corresponding negative pole. inhibiting the unit also discha rges the internal capacitors. charging of the capacitor is not possible when the buffer module is in inhibit mode. wiring scheme see fig. 8-2 , fig. 25-1 and fig. 25-2 . signal voltage max. 60vdc (between pin 6 and pin 9) signal current max. 4m a, current limited inhibit mode the unit does not buffer (or stops buffering) if the voltage between pin 6 and pin 9 is higher than 10v. below 6v buffering will function again. see chapter 21 . isolation voltage oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany 8/18
uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule 12. e fficiency and p ower l osses efficiency typ. >99% power supply mode, 20a output current, capacitors fully charged power losses typ. 1.9w power supply mode, 0a output current, capacitors fully charged 13. l ifetime e xpectancy and mtbf calculated lifetime expectancy *) 161 000h *) stand-by mode, 40c 457 000h *) stand-by mode, 25c mtbf **) sn 29500, iec 61709 2 348 000h stand-by mode, 40c 4 231 000h stand-by mode, 25c mtbf **) mil hdbk 217f 405 000h stand-by mode, 40c, ground benign gb40 636 000h stand-by mode , 25c ground benign gb25 134 000h stand-by mode, 40c, ground fixed gf40 198 000h stand-by mode, 25c ground fixed gf25 *) the calculated 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 calcu lated according to the capacitors manufacturer specification. the manufacturer of the electrolytic capacitors only guarantees a maximum life o f 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. oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany 9/18
uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule 14. f unctional d iagram fig. 14-1 functional diagram buffer capacitor charger & inrush limiter buffer capacitor buffer capacitor discharger status led 7 active 6 (+) ready monitor + - active monitor + - 8 ready 9 inhibit opto-coupler buffer capacitor shut-down input / output voltage monitor back-up level selector reverse- polarity protection - - + + safety and over- voltage protection chassis ground supply voltage opto-coupler opto-coupler 15. t erminals and w iring the terminals are ip20 finger sa fe constructed and suitable for field and factory wiring. supply voltage, chassis ground signals type quick-connect spring-clamp termi nals pluggable screw terminals solid wire max. 6mm 2 max. 2.5mm 2 stranded wire max. 4mm 2 max. 2.5mm 2 american wire gauge max. awg 20-10 awg 22-14 max. wire diameter max. 2.8mm (includi ng ferrules) 2.25mm (i ncluding ferrules) wire stripping length typ. 10mm / 0.4inch 6mm / 0.25inch tightening torque not applic able 0.4nm / 3.5lb.inch screwdriver not applicable 3mm slotted instructions: a) use appropriate copper cables that are designed for minimum operating temperatures of: 60c for ambient up to 45c and 75c for ambient up to 60c 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 tight ened or closed. e) ferrules are allowed. oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany 10/18
uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule 16. f ront s ide and u ser e lements fig. 16-1 front side a supply voltage terminals quick-connect spring-clamp terminals, two per polarity + positive supply voltage terminal C negative (return) supply voltage terminal b chassis ground terminal quick-connect spri ng-clamp terminals connection of the chassis to ground (earth) is optional and only required for a view specific applications. c signal connector 4-pole plug connector with screw termination comprises the following signals: - active signal, for details see chapter 9 . - ready signal, for details see chapter 10 - inhibit input, fo r details see chapter 11 d status led this green led indicates th at the following information: - off: capacitors are discha rged or supply voltage is below 44v. - on: capacitors are fully charged - slow flashing (1.25hz): capaci tors are getting charged. - fast flashing (10hz): capacitors are getting discharged. e back-up threshold jumper option 1: fixed mode (jumper in position 2-3) the unit switches to buffer mode as soon as the voltage falls below 45v. option 2: variable mode (jumper in position 1-2) unit switches to buffer mode when input voltage decreases by 2v. voltage changes slower th an 1.1v/s will be ignored if the voltage is above 45v. below 45v buffering starts immediately. for more details see chapter 5 . oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany 11/18
uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule 17. emc the buffer module is suitable fo r applications in industrial environment as well as in re sidential, commerc ial and light industry environment. emc immunity for all operating modes according to generic standards: en 61000-6-1 and en 61000-6-2 electrostatic discha rge en 61000-4-2 cont act 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 signals lines pin 6, 7, 8, 9 **) 2kv 2kv 2kv criterion a criterion a criterion a surge voltage on supply voltage terminals en 61000-4-5 + ? - + / - ? chassis ground 0.5kv 1kv criterion a criterion a surge voltage on inhibit input, active signal and ready signal en 61000-4-5 not applicable since length of signal wire specified shorter than 30m. conducted disturbance en 61000-4- 6 0.15-80mhz 10v criterion a *) chassis ground connection earthed (grounded) **) tested with coupling clamp criterions: a: buffer module shows normal operation behavior within the defined limits. emc emission for standby- and charging mode according to generic standards: en 61000-6-3 and en 61000-6-4 conducted emission, supply voltage iec/cispr 16-1-2, iec/cispr 16-2-1 limi ts for dc power ports acc. en 61000-6-3 fulfilled radiated emission en 55011, en 55022 class b 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. switching frequency the buffer module has two converters wi th variable frequencies included. 6 to 740khz charging converter at 48v i nput (is only active during charging) the frequency depends on the state of charge of the capacitors 10 to 85khz buffer converter at buffering at 45v the frequency depends on the out put current. the values are between 10% and 100% of th e nominal buffer current oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany 12/18
uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule 18. e nvironment operational temperature *) -25c to +70c (-13f to 158f) storage temperature -40 to +70c (-40f to 158f) 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 vibration random 0.5m2(s3) 2 hours / axis iec 60068-2-64 shock 30g 6ms, 20g 11ms 3 bumps / direction, 18 bumps in total iec 60068-2-27 altitude 0 to 6000m (0 to 20 000ft) approvals apply only up to 2000m over-voltage category iii iec 62103, en 62477-1 ii iec 62103, en 62477-1, above 2000m altitude 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. *) operational temperature is the same as the ambient or surrounding temperature and is defined as the air temperature 2cm bel ow the unit. **) do not energize while condensation is present 19. p rotection f eatures electrical protection electronica lly protected against overload , no-load and short-circuits over-voltage protection in buffer mode typ. 58vdc max. 60vdc in case of an internal buffer module defect, a redundant circuit limits the maximum output voltage. buffering stops and automatica lly attempts to restart. degree of protection ip 20 en/iec 60529 penetration protection > 3.5 mm e.g. screws, small parts reverse polarity protection yes max. -60v input overvoltage protection no internal input fuse not included 20. s afety f eatures class of protection no classification according to iec 61140 or iec 60950-1 possible install the buffer module according to class iii rules isolation resistance > 500mohm > 500mohm > 500mohm supply voltage to signal port supply voltage to housing signal port to housing chassis ground terminal resistance < 0.1ohm between housing and chassis ground terminal oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany 13/18
uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule 21. d ielectric s trength the signal port (active and ready signal and inhibit input ) is floating and separate d from the supply voltage. type and factory tests are c onducted by the manufacturer. field tests ma y be conducted in the field using the appropriate test equipment whic h applies the voltage with a slow ramp (2s up and 2s down). connect all poles of the power port terminals together as well as all poles of the signal port befo re conducting the test. when testing, set the cut-off current settings to the value in the table below. the follo wing isolation tests were performed : fig. 21-1 dielectric strength a b c type test 60s 500vac 500vac 500vac 14/18 factory test 5s 500vac 500vac 500vac field test 5s 500vac 500vac 500vac cut-off current setting > 1ma > 1ma > 1ma supply voltage chassis active and ready signal inhibit input a c b 22. a pprovals eu declaration of conformity the ce mark indicates confo rmance with the emc directive cb scheme, information technology equipment iec 60950-1 2 nd edition recognized for use as information technology equipment, u.s.a. (ul 60950-1) and canada (c22.2 no. 60950-1); e-file: e137006 ul 60950-1 2 nd edition ul 508 listed for use as industri al control equipment; u.s.a. (ul 508) and canada (c22.2 no. 107-1-01); e-file: e198865 ind. cont. e q. oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany
uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule 23. p hysical d imensions and w eight width 64mm 2.13 height 124mm 4.88 depth 102mm 4.02 the din-rail height must be added to the unit depth to calculate the total required installation depth. weight 740g / 1.63lb 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. 23-1 front view fig. 23-2 side view oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany 15/18
uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule 24. a ccessories 24.1. zm1.wall - w all mounting bracket this bracket is used to mo unt the buffer module on a wall without utilizing a din-rail. the two aluminum brackets and the black plastic slid er of the unit have to be detached, so that the steel brackets can be mounted. fig. 24-1 wall mounting fig. 24-2 mounting dimensions - wall mounting bracket oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany 16/18
uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule 24.2. zm14.side - s ide m ounting b racket 17/18 this bracket is used to mount the buffer module sideways with or without utilizing a din-rail. the two aluminum brackets and the black plastic slid er of the unit have to be detached, so that the steel brackets can be mounted. for sideway din-rail mounting, the removed alumi num brackets and the blac k plastic slider need to be mounted on the steel bracket. fig. 24-3 side mounting without din- rail brackets fig. 24-4 side mounting with din-rail brackets fig. 24-5 mounting dimensions side mounting bracket oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany
uf20.481 uf-series 48v, 20a, 100 ms , b uffer m odule oct. 2016 / rev. 2.0 ds-uf20.481-en all parameters are specified at 48v, 20a, 25c ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com phone +49 89 9278 0 germany 25. w iring d iagrams fig. 25-1 general wiring diagram fig. 25-2 signals supplied from an external voltage source l n pe + + - - power supply adj overload dc-ok optional l n pe load + - inhibit active relay, lamp or signal ready relay, lamp or signal + + - - uf20 buffer module back-up threshold status 6 + 7 active 8 ready 9 inhibit l n pe + + - - power supply adj overload dc-ok l n optional pe load + - inhibit active relay, lamp or signal ready relay, lamp or signal + + - - uf20 buffer module back-up threshold status 6 + 7 active 8 ready 9 inhibit external voltage source + - fig. 25-3 paralleling of buffer modules fig. 25-4 decoupling of buffered branches l n pe + + - - power supply adj overload dc-ok optional l n pe + + - - uf20 buffer module back-up threshold status 6 + 7 active 8 ready 9 inhibit load + - + + - - uf20 buffer module back-up threshold status 6 + 7 active 8 ready 9 inhibit l n pe + + - - power supply adj overload dc-ok l n optional pe un- buffered load + - yr2 redund- ancy module + - out + - in 1 + - in 2 buffered load + - + + - - uf20 buffer module back-up threshold status 6 + 7 active 8 ready 9 inhibit 18/18

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