BUFFER UNIT Buffering wih elecrolyic capaciors insead of lead baeries Buffering of 24V loads Minimum hold-up ime 0.2s a 20A Longer hold-up ime a lower loads Clear saus indicaion by saus LED and signaling erminals Quick-connec spring-clamp erminals 3 Year warrany 1. GENERAL DESCRIPTION 2. SHORT-FORM DATA The buffer uni is a supplemenary device for regulaed DC24V power supplies. I buffers load currens during ypical mains fauls and load peaks. Working principle Charge Buffer In imes when he power DC supply provides sufficien Discharge volages, he buffer uni sores energy in inegraed elecrolyic capaciors. In case of mains volage faul, his energy is released again in a regulaed process. Bridges mains fauls wihou inerrupion Saisic show ha 80% of AC DC all mains faul lass less han 0.2s. These mains fauls are compleely bridged by he buffer uni. This increases he reliabiliy of he sysem as a whole. Exended hold-up ime Once mains power fails or is swiched off, he buffer AC DC uni will coninue o provide he load curren for a defined period of ime. Process daa can be saved and processes can be erminaed before he DC power swiches off. Conrolled resars are subsequenly possible. Raed volage DC 24V Volage range 24-28.8V Oupu volage 22.5V or V IN 1V selecable by jumper Oupu curren 0 o 20A Hold-up ime min 0.2s 22.5V, 20A yp 0.31s 22.5V, 20A min 28s 22.5V, 0.1A yp 43s 22.5V, 0.1A Charging curren max 600mA Charging ime yp 18s Inpu curren yp 80mA sandby mode Power dissipaion yp 1.9W sandby mode Temperaure range -25 C o +70 C operaional Dimensions 64x124x102mm WxHxD Easy o handle, expandable and mainanance-free The buffer uni does no require any conrol wiring. I can be Power Buffer AC Supply Uni(s) added parallel o he load circui a any given poin. Buffer unis DC can be swiched in parallel o increase he oupu ampaciy or he hold-up ime. Load + - 3. ORDER NUMBERS 4. MARKINGS UF20.241 24, 20A, 200ms Accessory ZM1.WALL Wall mouning bracke ZM14.SIDE Side mouning bracke XF-1x4s/270-60 Maing connecor, Par of delivery UL 508 UL 60950-1 EMC, LVD 1/11
INDEX PAGE INDEX PAGE 1. General Descripion... 1 2. Shor-form Daa... 1 3. Order Numbers... 1 4. Markings... 1 5. Sandby Mode... 3 6. Charging Mode... 3 7. Buffer Mode... 4 8. Funcional Diagram... 5 9. Fron Side and User Elemens... 5 10. Operaing Diagram... 6 11. Acive and Ready Signal, Inhibi Inpu... 6 12. Terminals and Wiring... 7 13. Reliabiliy... 7 14. EMC... 8 15. Environmen... 8 16. Proecion Feaures... 9 17. Safey... 9 18. Approvals... 9 19. Fulfilled Sandards... 9 20. Physical Dimensions and Weigh... 10 21. Wiring Diagrams... 11 INSTALLATION NOTES Mouning Orienaion: The power erminal shall be locaed on op of he uni. Cooling Convecion cooled, no forced air cooling required. Do no obsruc air flow! Insallaion clearances: Recommended insallaion clearances: 40mm on op of he uni, 20mm on he boom of he uni, 0mm (or 15mm in case he adjacen device is a hea source) on he lef and righ side of he uni Inended use This buffer uni has been designed for use in panel board insallaions or oher building-in applicaions where a suiable mechanical enclosure shall be provided o fulfil local requiremens. Service pars: The uni does no conain any service pars. If damage or malfuncioning should occur during operaion, immediaely urn power off and send uni for inspecion o facory! DISCLAIMER The informaion presened in his documen is believed o be accurae and reliable and may change wihou noice. 2/11
5. STANDBY MODE Inpu volage nom. DC 24V Volage range nom. 24-28.8Vdc Inpu curren yp. 80mA Sandby mode Power dissipaion yp. 1.9W lamp permanen on Acive signal high ohmic Ready signal low ohmic 6. CHARGING MODE Charging curren min. 0.4A Charging mode max. 0.6A Charging mode Charging ime min. 20s / 15s Iniial charge 1) / Re-charging 2) max. 29s / 21s Iniial charge 1) / Re-charging 2) lamp flashes 1.25Hz Acive signal high ohmic Ready signal high ohmic 1) Iniial charging is he firs charge afer volage is applied o he buffer uni. 2) Re-charging is he charging of he inernal capaciors afer volage inerrupions shorer han 2minues. Fig. 6-1 Re-charging ime, 24V Charge 100% 80 60 40 min max 20 Charging Time 0 5 10 15 20 25 30s 3/11
7. BUFFER MODE Raed oupu curren nom. 20A Curren limiaion min. 20A Elecronically limied Oupu volage yp. 22.5V Jumper in posiion 22.5V fixed yp. 1V below inpu volage Jumper in posiion Vin 1V Ripple and noise volage max. 200mVpp 20Hz o 20MHz, 50Ohm Hold-up ime min. 0.2s 22.5V, 20A yp. 0.31s 22.5V, 20A min. 28s 22.5V, 0.1A yp. 43s 22.5V, 0.1A To increase buffer curren or exend hold-up ime any given number of buffer unis can be pu in parallel Acivaion hreshold yp. 22.5V Jumper in posiion 22.5V fixed Buffering sars if erminal volage falls below 22.5V yp. Vin 1V Jumper in posiion Vin 1V Buffering sars if he erminal volage decreases by more han 1V. Buffering ends when erminal volage increases by more han 1V Volage changes slower han 0.54V/s will be ignored unless he volage is above 22.5V. Below 22.5V buffering sars immediaely. lamp flashes 10Hz Acive signal low ohmic Ready signal high ohmic 100,0 A Fig. 7-1 Hold-up ime Buffer Curren 10,0 A yp. ( 22,5 V ) yp. ( 27,8 V ) min. ( 22,5 V ) 1,0 A 0,1 A 0,1 s 1,0 s 10,0 s 100,0 s 4/11
8. FUNCTIONAL DIAGRAM Fig. 8-1 Funcional diagram + + - - Reverse- Polariy Proecion Safey and Over- Volage Proecion Buffer Capacior Charger & Inrush Limier Buffer Capacior Discharger Buffer Capacior Buffer Capacior Shu-Down lamp Chassis Ground Opokoppler Inpu / Oupu Volage Monior Level Selecor Ready Monior Opokoppler Acive Monior Opokoppler 9. FRONT SIDE AND USER ELEMENTS I/O Power Por Quick-connec spring-clamp erminals, + Posiive erminal - Negaive erminal Chassis Ground o bond he housing lamp OFF: Buffer is discharged, or erminal volage is below 22V ON: Uni is fully charged Flashes 1,25Hz: Uni is in charging mode Flashes 10Hz: Uni is in discharging mode Signal Por Plug Connecor 6 common + pole : uni is buffering : uni is on sand-by : iniiaes buffer discharging and inhibis recharging of capaciors Fig. 9-1 Fron side hreshold jumper 1-2: Variable mode Uni swiches o buffer mode when inpu volage decreases by 1V wihin 0.54V/s or he inpu volage falls below 22.5V. 2-3: Fixed mode, (facory seing) Uni swiches o buffer mode as soon as he volage falls below 22.5V Missing jumper = 22.5V fixed Se he uni o fixed mode: - when power supplies oher han he Dimension Q-Series are used - wih back-feeding loads - when he buffer uni is placed close o he load - whenever in doub Se he uni o variable mode: - for 28V applicaions - when he buffer uni is placed close o he power supply 5/11
10. OPERATING DIAGRAM Fig. 10-1 Operaing diagram Fig. 10-2 Signals schemaic V Mains Hold-up Time Power Supply V Buffer Capacior V ou Ready Opocoupler high ohmic Opocoupler low ohmic Acive Opocoupler high ohmic 5,1V Opocoupler low ohmic LED 1.25Hz 10Hz UF20 3mA Charging Mode Sandby Mode Buffer Mode 11. ACTIVE AND READY SIGNAL, INHIBIT INPUT Acive signal (Pin 7) low ohmic while buffer capaciors are discharging Signal volage max. 35Vdc Signal curren max. 10mA Volage drop across opo-coupler yp 0.9V / 3V a 1mA / 5mA, while opo-coupler is low ohmic Leakage curren max. 50μA while opo-coupler is high ohmic Isolaion nom. 500Vac Signal por o power por Ready signal (Pin 8) low ohmic when buffer is fully charged Signal volage max. 35Vdc Signal curren max. 10mA Volage drop across opo-coupler yp 0.9V / 3V a 1mA / 5mA, while opo-coupler is low ohmic Leakage curren max. 50μA while opo-coupler is high ohmic Isolaion nom. 500Vac Signal por o power por Inhibi inpu (Pin 9) High inpu signal iniiaes uni shudown and buffer discharge Signal volage max. 35Vdc Signal curren max. 4mA curren limied Shu-down hreshold min. 6Vdc Uni is in shu-down mode above his hreshold level max. 10Vdc Isolaion nom. 500Vac Signal por o power por Wiring diagrams can be found in secion 21. 6/11
U-Series 24V, 20A, 200ms 12. TERMINALS AND WIRING Power erminal Type Bi-sable, quick-connec spring clamp erminals. IP20 Finger safe consrucion. Suiable for field- and facory insallaion. Shipped in open posiion. Solid wire 0.5-6mm 2 Sranded wire 0.5-4mm 2 AWG 20-10AWG Ferrules Allowed, bu no required Pull-ou force 10AWG:80N, 12AWG:60N, 14AWG:50N, 16AWG:40N (according o UL486E) Wire sripping lengh 10mm / 0.4inch Fig. 12-1 Connecing a wire Insrucions: a) Use appropriae copper cables, ha are designed for an operaing emperaure of 60 C b) Follow naional insallaion codes and regulaions! c) Ensure ha all srands of a sranded wire ener he erminal connecion! d) Up o wo sranded wires wih he same cross secion are permied in one connecion poin Signal erminal 1. Inser he wire 2. Snap he lever To disconnec wire: same procedure vice versa Type Solid / sranded wire AWG Ferrules Wire sripping lengh Tighening orque Plug connecor wih screw erminal mechanism. Finger-ouch-proof erminal wih capive screws for 3.5mm sloed screwdriver. 0.2-2.5mm2 22-14AWG up o 1.5 mm2 wire gauge 6mm / 0.24inch 0.4Nm, 3.5lb.in 13. RELIABILITY Lifeime expecancy min. 41 000h 40 C, sand-by mode min. 116 000h 25 C, sand-by mode MTBF SN 29500, IEC 61709 2 327 000h 40 C, sand-by mode 4 219 000h 25 C, sand-by mode MTBF MIL HDBK 217F 398 000h 40 C, sand-by mode, ground benign GB40 624 000h 25 C, sand-by mode, ground benign GB25 The Lifeime expecancy shown in he able indicaes he operaing hours (service life) and is deermined by he lifeime expecancy of he buil-in elecrolyic capaciors. Lifeime expecancy is specified in operaional hours. Lifeime expecancy is calculaed according o he capacior s manufacurer specificaion. MTBF sands for Mean Time Beween Failure, which is calculaed according o he saisically device failures, and indicaes reliabiliy of a device. I is he saisical represenaion of he likelihood of a uni o fail and does no necessarily represen a life of a produc. 7/11
14. EMC The uni is suiable for applicaions in indusrial environmen as well as in residenial, commercial and ligh indusry environmen wihou any resricions. CE mark is in conformance wih EMC guideline 89/336/EEC and 93/68/EEC and he low-volage direcive (LVD) 73/23/EWG. A deailed EMC Repor is available on reques EMC Immuniy EN 61000-6-1 EN 61000-6-2 Generic sandards Elecrosaic discharge 1) EN 61000-4-2 Conac discharge Air discharge 8kV 15kV Crierion A Crierion A Elecromagneic RF field EN 61000-4-3 80MHz-1GHz 10V/m Crierion A Fas ransiens (Burs) EN 61000-4-4 2kV Crierion A Surge volage EN 61000-4-5 + - + / - housing 500V 500V Crierion A Crierion A Conduced disurbance EN 61000-4-6 0,15-80MHz 10V Crierion A 1) Din-Rail earhed EMC Emission EN 61000-6-3 and EN 61000-6-4 Generic sandards Conduced emission EN 55022 Class B Radiaed emission EN 55011, EN 55022 Class B This device complies wih FCC Par 15 rules. Operaion is subjeced o following wo condiions: (1) his device may no cause harmful inerference, and (2) his device mus accep any inerference received, including inerference ha may cause undesired operaion. 15. ENVIRONMENT Operaional emperaure -25 C o +70 C full power Sorage emperaure -40 o +85 C sorage and ransporaion Humidiy 5 o 95% r.h. no condensaion allowed Vibraion sinusoidal 2-17.8Hz: ±1.6mm; 17.8-500Hz: 2g IEC 60068-2-6 Vibraion random 0.5m 2 (s 3 ) IEC 60068-2-64 Shock 30g 6ms, 20g 11ms IEC 60068-2-27 Aliude 0 o 6000m All approvals apply only up o 2000m Over-volage caegory III EN 50178 II EN 50178 above 2000m aliude Degree of polluion 2 EN 50178, no conducive The ambien emperaure is defined 2cm below he uni. 8/11
16. PROTECTION FEATURES Buffer proecion Oupu over-volage proecion in buffer mode Elecronically proeced agains overload, no-load and shor-circuis yp. 32Vdc max. 35Vdc In case of an inernal defec, a redundan circuiry limis he maximum oupu volage. The oupu shusdown and makes resar aemps auomaically. Degree of proecion IP 20 EN/IEC 60529 Peneraion proecion > 3.5mm e.g. screws, small pars Reverse polariy proecion yes max. 35Vdc Inpu over-volages proecion yes max. 35Vdc, no harm or defec of he uni Inernal fuse no included 17. SAFETY Oupu volage SELV IEC/EN 60950-1 PELV EN 60204-1, EN 50178, IEC 60364-4-41 Class of proecion II Isolaion resisance > 5MOhm Power por o housing, 500Vdc PE resisance < 0.1Ohm beween housing and chassis ground erminal Dielecric srengh 500Vac Power por o signal por 500Vac Power por / signal por o housing 18. APPROVALS UL 508 18WM LISTED E198865 lised for use in U.S.A. (UL 508) and IND. CONT. EQ. Canada (C22.2 No. 14-95) Indusrial Conrol Equipmen UL 60950-1 RECOGNIZED E137006 recognized for he use in U.S.A. (UL 60950-1) and Canada (C22.2 No. 60950) Informaion Technology Equipmen, Level 5 IEC 60950-1 CB Scheme, Informaion Technology Equipmen IECEE CB SCHEME 19. FULFILLED STANDARDS EN/IEC 60204-1 EN/IEC 61131 EN 50178 Safey of Elecrical Equipmen of Machines Programmable Conrollers Elecronic Equipmen in Power Insallaions 9/11
20. PHYSICAL DIMENSIONS AND WEIGHT Widh 64mm / 2.51 Heigh 124mm / 4.88 Deph 102mm / 4.02 plus deph of DIN-rail and deph of signal connecor Weigh 740g / 1.63lb DIN-Rail Use DIN-rails according o EN 60715 or EN 50022 wih a heigh of 7.5 or 15mm Fig. 20-1 Side view Fig. 20-2 Fron view Signal Connecor 10/11
21. WIRING DIAGRAMS Fig. 21-1 General wiring diagram Fig. 21-2 Signals supplied from an exernal volage Load + - Power Supply Adj DCok Overload L N PE - - + + UF20 Threshold Acive Relay, lamp or signal Ready Relay, lamp or signal Inhibi - - + + UF20 Threshold Acive Relay, lamp or signal Ready Relay, lamp or signal Inhibi + L N PE opional Fig. 21-3 Paralleling of buffer unis Fig. 21-4 Decoupling of buffered branches Load + - Power Supply Adj DCok Overload L N PE - - + + UF20 Threshold - - + + UF20 Threshold Unbuffered Load + - Power Supply Adj DCok Overload L N PE IN 1 IN 2 YR2.Diode Decoupling Module OUT - - + + UF20 Threshold Buffered Load L N PE opional L N PE opional 11/11