Bramco ELF2 User Manual - Industry Surplus Australia
Contents
1. ELECTRONICS ELF2 Earth Leakage Relay A00842 A00976 A01019 Manual Version 4 1 ELF2 Version 2 2 Operation Manual ELF2 Manual Part number A00842 500mA 500ms 110 240VAC 24 48VDC A00976 Multi ranging 110 240VAC 24 48VDC AO1019 Extended range 110 240VAC 24 48VDC Manual Version 4 1 ELF2 Version 2 1 May 2008 Copyrights All rights reserved This document may not in whole or part be copied photocopied reproduced translated or reduced to any electronic medium or machine readable form without the express written permission of Bramco Electronics Disclaimer Bramco Electronics has made every attempt to ensure that the information contained in this document is accurate and complete Bramco Electronics makes no representation or warranties of merchantability or fitness for any particular purpose Bramco Electronics reserves the right to make changes to the system and or document at any time without notice Bramco Electronics Unit 283 Callistemon Close Warabrook NSW 2304 Australia www bramco com au Ph 61 2 4014 4444 Fax 61 2 4967 4100 Email sales bramco com au ELF2 Manual V4 1 ELF2 Version 2 2 2 17 Contents 1 1 1 1 2 1 3 1 4 2 2 1 2 2 2 3 2 4 2 5 3 4 4 1 4 2 4 3 4 4 OVERVIEW Features Physical Layout Plug Connections on rear Models ELF2 OPERATION Setup Tripping Resets Output amp Monitoring Multi Function DIP switches SPECIFICATIONS2. FOR ELF 2 INSTALLATION Mounting Cabling ELF 2 Operating voltage selection EL Toroids 5 FAULT DIAGNOSIS 6 ELF 2 TYPICAL CONNECTIONS ELF2 Manual V4 1 ELF2 Version 2 2 10 10 11 12 13 14 14 14 15 15 16 17 3117 1 OVERVIEW The Bramco ELF 2 has been designed to detect Earth current faults flowing in a power system and to provide visual indication of Earth Leakage conditions This relay is specifically designed to protect systems supplying VF Drives and provides very high immunity to converter noise It is physically the same package as ELF relay with the exception of the extra rear socket for RS485 connection providing an easy upgrade path for the user 1 1 Features a High noise immunity for VSD loads e Accurate and reliable current measurement and trip delays Easily configured latching non latching and failsafe non failsafe mode of operation Toroid open protection and indication a LCD display provides o Display of actual leakage current as a direct mA value as a bar graph and as a percentage of the trip point Readout of trip current and delay set points Relay operational parameters Last fault duration O O O O Trip indication e Adjustable trip current and delay time from front panel Front panel reset button enabled via a link on the rear panel Provision for a remote reset button Status LEDs on the front panel for o Power o Warning fault Compatible wit
3. Supply Voltage select switch isaccessed througha hole in the top of the enclosure Use screw driverto alter setting Trip Current Range A00842 50 500mA AC A00976 10 full scale for 500mA 1A 2A or 5A AC selectable A01019 10 full scale for 2A 54 10A or20A AC selectable Frequency Range 20 200Hz Sinusoidal Trip Delay Range A00842 30 500ms A00976 30ms full range for 500ms 1s 2s 5s selectable A01019 30ms full range for 2s 5s 10s 20s selectable Earth Leakage 4 20mA into 250 ohms maximum Terminals 21 amp 22 Current Monitor 2 10v available by linking terminal 22 to 20 NOTE Do NOTEarth PosorNeg Relay Function Failsafe or Non Failsafe Switch selection Latching orNon Latc hing Switch selection Latch Reset Local Reset Enabled by linking terminals 18 19 Push and hold for 2 seconds for reset Remote Reset Momentary closure of terminals 16 17 from remote N O pushbutton for reset ELF 2 Contact ratings 2xC O 5A 250vAC 100vA max 5A 30vDC Resistive 3A 30vDC Inductive load 90W L R 7mS Maximum Switching 380vAC 125vDC Voltage ELF2 Manual V4 1 ELF2 Version 2 2 13 17 4 INSTALLATION 4 1 Mounting The ELF 2 relay isfascia packaged for through panel mounting Panel cut out is 90 x90 mm See the Physical Layout section for cut out detail Use sealing gasket provided positioned behind front bezel for panel sealing and use the 2 adjustabl
4. YPICAL CONNECTIONS AC LOAD T TI IT REAR VIEW A00842 Ma Ma Ma CONTACTOR EH NH 12 3 4 5 6 7 lg 9 J10 11 12 I MAX RATING AN E 24 48VDC 5A 240VAC 23 24 25 RS485 PORT DA DB COM OPTIONAL NFS NO LATCH MODE SELECT D DS N SWITCHES w gt un ey oo NO ol N FS LATCH E lg Poe oie eT ae BRAMCO 5 en EL TOROID f eh _ _ 2CORE SCREENEDCABIE ______ iffi as 4 wif ji CORE BALANCE PROTECTION 3 m AAA ath i amp i ji f e Bi yl i mI oO a t E i a O PB ALTERNATIVE ARANGEMENT amp lo NEG POS i BURN IN en REMOTE RESET 4 20mA OUTPUT ELT 24 ww OR 2 CORE SCREENED CABLE 2 10V OUTPUT NGR 777 TRANSFORMER SUPPLY ELF2 Manual V4 1 ELF2 Version 2 2 17 17
5. de failsafe non latching non Accessed via button press o Faultindication shows fault type when relay is tripped orlatched o Fault Duration shows last EL fault duration Accessed by holding button ELF2 Manual V4 1 ELF2 Version 2 2 11 17 2 5 Multi Function DIP switches This isa non user setting The switches allow varioustime and current rangesto be set These switches should only be changed afterconsultation with a Bramco Technical Representative Note that the 500mA 500ms only version of the ELF2 A00842 is unaffected by the DIP settings in accordance with AS2081 2002 Ifa different current range is required changing the DIP settings is insuffic ient to complete the change The rela y and toroid must both be sent to Bramco for adjustments and recalibration Forextended range ELF2s 1A or greater a matched toroid is required for accuracy and reliability On each of the time range settings the minimum set point is 30ms A00976 Multi range ELF2 ee embers Pe Bamber DIP Numbers Current Range DIP Numbers Time Time Range 500mA A01019 Extended range ELF2 PP Numbers _ u i DIP Numbers Current Range DIP Numbers Time Time Range ELF2 Manual V4 1 ELF2 Version 2 2 12 17 3 SPECIFICATIONS FOR ELF 2 Supply Voltage 120V or 240V Selectable 20 50 60Hz 2VA Terminals 1 2 amp 3 NOTE ELF 2 when shipped isset to 240vAC 24 48VDC 20 2VA Terminals 5 6 NOTE ThisDC supply must be isolated from Earth
6. e Non Failsafe Set using the selector switch on the rear panel In failsafe mode the trip contacts energise when the relay is healthy e g a N C contact willbe open when the relay is healthy In non failsafe mode the trip contacts energise when the relay is unhealthy e g a N C contact will be closed when the rela y is healthy e Latching Non Latc hing Set using the selector switch on the rear panel In the latching mode the trip contacts remain in the tripped position until the fault clears AND a reset either local or remote is initiated by the user ELF2 Manual V4 1 ELF2 Version 2 2 9 17 2 2 Tripping The conditions fora trip are e ELcurent exceeding the trip current passes through the detection toroid for a period greater than the delay time specified e The toroid isdisconnected from the relay If a trip condition isdetected the trip contacts change state In failsafe mode the contacts will de energise undera trip condition In non failsafe the contacts energise with a trip Note the commit time fora trip is 25ms less than the delay time That is if a fault condition persists for longer than 25ms less than the trip delay but shorterthan the trip delay itself the unit will still trip Thisisa deliberate behaviour to adjust forthe intemal hardware pickup time forhandling the trip 2 3 Resets To reset the ELF2 the fault earth leakage orno toroid must firstly be cleared If the trip condition wasan EL fault the measu
7. e clampsto fasten ELF 2 to mounting panel When mounted as above the exposed ELF 2 Relay bezel has IP66 rating ELF 2 relay and EL Toroid should be mounted away from stray flux sources such as power supplies transformers control relays and contactorsand cablescamying load currents 4 2 Cabling Use 2 core screened cable forthe following inputs e EL Toroid e ELRemote LATCH RESET voltage free contact Each individual cable screen should be connected to the ELF 2 relay to Terminal 15 NOTE Do not earth the non relay end ofthese screened cables It isrecommended that these 2 screened cablesare run by a direct route to the ELF 2 relay BUTare not to run with orin cable hamessorducting with control or power cabling Where necessary cross other cables at 90 degreesand provide maximum clearance from high voltage curent circuits as much as practically possible ELF2 Manual V4 1 ELF2 Version 2 2 14 17 4 3 ELF 2 Operating voltage selection Two optionsare available for powering the ELF2 AC or LV DC AC Power Either 120VAC or 240vAC input isconnected to Terminals 1 and 2 Before powering the ELF 2 check and adjust to the matching voltage setting on the intemal voltage selector switch The switch isaccessed through the top of the relay ELF 2 body The factory setting is 240v NOTE If powered from 240vAC with the 120v switch setting the ELF2 will be damaged Low voltage DC Power For 24 48VDC input is connected to ter
8. h Bramco s standard Earth Leakage Toroid range 500mA 1A 2A etc Note for extended range detection beyond 500mA matched toroid relay pairs must be used Current loop or voltage output 4 20mA or 2 10V output Clear hinged front cover offers protection to IP66 when properly mounted Multiple input voltage available as standard for relay Operates on limited and unlimited neutral systems ELF2 Manual V4 1 ELF2 Version 2 2 4 17 1 2 Physical Layout The ELF 2 relay enclosure is designed forthrough panel mounting with clamping kit supplied ELF2 Front View kE P K Warning aw Power S O Kad O EARTH LEAKAG E PROTECTION Trip Cument Show Settings Delay Hold for Reset ELF 2 Rear View BRAMCO ELECTRONICS ELF2 Power In Relay Output Set Voltage Max Rating Select 120 240Vac 5A 240V AC Mains Low Volt AN E 204800 Lebe Ly 23 24 25 Setup DA DB COM Non ani atc RS 485 Failsafe OFF 13 14 15 16 17 18 19 20 21 22 O O ber 1 eee oe Remote Link for ENE S Reset Local Reset 4 20mA 4 LINK FOR 2 10V Toroid Reset Output ELF2 Manual V4 1 ELF2 Version 2 2 5 17 ELF 2 Basic Enclosure Dimensions BR 0 w Y Power y Warning O Hd O AA Trip Current Show Settings Delay Hold for Reset H 90mm cutout 85mm behind panel 20mm NOTE Allow 50 mm minimum reardepth behind ELF 2 to allow for cabling to Pheonix plugs ELF 2 Mounting Panel cut
9. int msors C Measured earth leakage curent mA orA D Measured earth leakage asa percentage of set point E Bargraph representation of percentage earth leakage Constantly viewable if no button pressed or fault condition present Summary Screen A Fault current set point mA orA B Trip delay set point msors Shows operational mode latching non latc hing failsafe non fa ilsafe Accessed by momentary pres of local reset Remains for5 seconds Fault Duration Screen A Time in msorsof last fault detected by ELF2 Accessed by pressing local reset for 2 seconds Remains for5 seconds Local Reset Lockout Screen Local reset is not enabled link terminals 18 19 to enable Local Reset Screens LATCHING AAAmA FAULT DUI Viewable by initiating a local reset when a latched faulthasoccured and the fault condition hascleared LCD Fault Messages E been set Fault must clearand manual latch reset to become healthy ED forrelay to become healthy l become healthy when fault clears Open toroid check toroid connections Relay will become healthy when fault ATCH clears Latch from a previous fault exists fault type unable to be determined Usually when latched at startup Requires latch reset for healthy relay ELF2 Manual V4 1 ELF2 Version 2 2 16 17 6 ELF 2 T
10. minals 5 Neg and 6 Pos This must be an isolated power supply source NOTE For correct operation of the ELF2 this supply must not be earthed 4 4 EL Toroids IMPORTANT Match the EL Toroid Scaling with ELF 2 relay For the A00842 a standard 500mA Bramco EL toroid should be used For the A00976 and A01019 a current matched and calibrated toroid pair should be used EL toroidshave a powdercoated mild steel open faced enclosure which actsas a shield to stray flux Forthis to be effective the open side of the ELTshould face away from stray flux sources such as transformers relays and contactors and for best effect facing but not touching the steel enclosure body The three phase load power cables should be arranged to passsymmetrically through the centre of the ELtoroid window If the cables are asymmetrical through the centre of the toroid incorrect EL detection may occur ELF2 Manual V4 1 ELF2 Version 2 2 15 17 5 FAULT DIAGNOSIS To assist in fault diagnosis a variety oftypicalfaultsare shown with possible solutions given Possible Condition Suggestion LED Indication or 24 48VAC DC isconnected failsafe and the presence of any fault conditions Earth leakage current below 80 AND toroid connected properly Earth leakage current above 80 but beneath 100 of trip point Earth leakage current above 100 OR toroid fault LCD Information Screens Status Screen A Fault current set point mA orA B Trip delay set po
11. nd providesthe following optionsfortrip ranges e Curent ranges 2A 5A 10A and 20A ranges Trip point may be set between 10 and full scale e Time ranges 2s 5s 10sand 20s ranges Trip delay time may be set between 30ms and full range ELF2 Manual V4 1 ELF2 Version 2 2 8 17 2 ELF2 OPERATION The ELF2 monitorsthe amount of current passing through an Earth Leakage Toroid If the measured current exceedsthe trip current forthe nominated fault time the rela y will trip changing the state of its trip contacts terminals 7 12 and indicating a fault on the LCD The trip rangesare as follows e 50mA to 500mA and 30msto 500ms for the 500mA 500ms only ELF2 A00842 AS2081 2002 compliance e 10 of full scale current to full scale e g 100MA to 1A and 30msto full range e g 2s forthe multi range ELF2 A00976 and extended range ELF2 A01019 PLEASE NOTE forthe multi range and extended range ELF2 products the relay will be supplied with a matched toroid It is important that the relay and its matching Earth Leakage Toroid are used in conjunction with one another foraccuracy and relia bility 2 1 Setup The parameters that may be adjusted to set up the ELF2 are the following e Trip Delay Time Adjusted using the Delay knob on the front panel of the relay A cascaded timing scheme covering all EL protection equipment is recommended e Tip Curent Adjusted using the Trip Current knob on the front panel of the ELF2 e Failsaf
12. out dimensions 90mm ELF2 PANEL CUT OUT FRONT VIEW 90mm ELF2 Manual V4 1 ELF2 Version 2 2 6 17 1 3 Plug Connections on rear Terminal Terminal Function Terminal Terminal Function Number Number 1 AC power 7 EL N O 2 AC power 8 EL COM 3 EARTH 9 EL N C 4 Spare No Connection 10 EL N C 5 DC NEG ISOLATED 11 EL COM 6 DC POS ISOLATED 12 EL N O Optional RS485 Port Terminal Terminal Function Number 23 RS485 DA 24 RS485 DB 25 RS485 OV Terminal Terminal Function Number ES EL TOROID 14 EL TOROID 15 SCREEN EL TOROID 16 REMOTE RESET 17 REMOTE RESET 18 ENABLE LOCAL RESET 19 ENABLE LOCAL RESET 20 VOLTS POS OUTPUT Link to 22 21 mA V Neg OUTPUT 22 4 20mA Pos OUTPUT ELF2 Manual V4 1 ELF2 Version 2 2 7 17 1 4 Models Three models of the ELF2 are available A00842 Implements the full functionality of the ELF2 with the exception of limiting the trip parameters to a maximum of 500mA and 500ms This is in compliance with AS2081 2002 A00976 Implements the full feature set described above and provides the following options for trip ranges e Curent ranges 500mA 1A 2A and 5A ranges Trip point may be set between 10 and full scale e Time ranges 500ms 1s 2sand 5s ranges Trip delay time may be set between 30msand full range A01019 Implementsthe full ELF2 feature set a
13. red earth leakage current must fall below 80 of the trip current set point In non latching mode the ELF2 will reset automatically once the fault isgone In latching mode the user must reset the ELF2 manually by either using a localor remote reset Local Reset must be enabled by linking terminals 18 and 19 The reset button must be pushed held for 2 secondsand released to reset the unit Remote Resetcan be enabled by wiring a N O pushbutton to terminals 16 and 17 The button must change state from open to closed to cany out the reset ELF2 Manual V4 1 ELF2 Version 2 2 10 17 2 4 Output amp Monitoring There are 3 output types e LED indication A steady green LED indicates that the unit is powered A flashing red LED indicates that the EL fault level isbetween 80 and 100 of the trip point A steady red LED indicates EL fa ult level gt 100 trip point or toroid fa ult e 4 20mA 2 10V terminals A scaled indication of the percentage of full scale 4mA 2V indicates no EL fault current 20mA 10V indicates EL fa ult level gt full scale 4 20mA Terminal 21 positive terminal 22 negative Maximum loading 2500 2 10V Terminals 20 22 linked Terminal 21 negative terminal 22 positive Note the output isscaled against the full scale of the unit 500mA 1A etc ratherthan the set point e LCD Four main functions o Main Screen shows trip settings and fault level o Settings Screen shows trip settings time current plus operational mo
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