vg rope brake (vgrb2) · the vg rope brake does not require an external power source to generate...
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www.atwellinternational.com
VG Rope Brake (VGRB2)Operation and Installation Manual
Version 3.0
1VG Rope Brake (VGRB2) Version 3.0
Contents
Handle
Disc Springs
Front Plate
4 X M12 ScrewsUndo to split the rope brake
Front CoverElectrical Connecting PlugSafety Switch, Electromagnetic Power Supply and Earth Connections
M16 Threaded for mounting bracket
Fixed Jaw
Back Plate
Drop Jaw
Overview ....................................................................................................................2
Braking Capacity ........................................................................................................3
Rope Factors ..............................................................................................................4
Gripping Elements .....................................................................................................4
Control Requirements ...............................................................................................5
• 6a–RB2controlbox • 6b–UMD-SRB01controlbox
EnquiryForm(Example) ............................................................................................6
BrakeselectionProgram(Example)..........................................................................7
InstallationoftheVGropebrake ..............................................................................8
DrawingTD-RB4 ........................................................................................................9
Installation VGRB2 ...................................................................................................10
Installation VGRB2 ...................................................................................................11
DimensionsVGRB2–singlebrakeunit ...................................................................12
DimensionsVGRB2–duplexedbrakeunits ...........................................................13
DimensionsVGRB2–withUMD-SP01sensorunit .................................................14
WiringDiagram–RB2ControlBox .........................................................................15
WiringDiagram–UMD-SRB01ControlBox ............................................................16
VGropebrakewithRB2HandWindingInstructions ..............................................17
VGropebrakewithUMD-SRB01HandwindingInstructions ................................18
Maintenance ............................................................................................................19
TypicalInstallationofVGropebrakeandUMD-SRB01 ..........................................20
MountingBracketDesign ............................................................................... 21&22
AdjustingtheRopeBrake .......................................................................................23
FrequentlyAskedQuestions ...................................................................................24
2 AtwellInternationalLimited
To Reset the VG rope brake after engagement.
1. Turn key switch to rest
2. Slacken 4 x M12 screws (19mm spanner) 3. Pivot handle back until magnet re-‐ latches 4. Retighten 4 x M12 Screws (no torque setting
required) 5. Turn Key switch back to RUN.
4 x M12 screws
Handle
Moving Jaw
Fixed Jaw
TheVGropebrakewasdesignedbyDrDSCameronin2002forAtwellInternationalLtd.Theropebrakewasre-designedin2007toenableittooperateinabi-directionalmodeandtoimprovemanufactureandassembly.However,theessentialoperatingprinciplesremainunchanged.TheVGropebrakeiscoveredbyUKpatent2314070andis“CE”certifiedbyBSI.
Thebrakeoperatesontheliftropesandisdesignatedasa“movementprevention”or“speedreducing”meansincompliancewithEN81-11998clause9.10.TheVGropebrakecombinestheproventechnologyof“drop-jaw”typegovernorswiththepatentedVGlinkagemechanism.ThebrakeoperatesinasimilarmannertoaVGsafetygearexceptthatithasonefixedjawandonemoveablejawor“drop-jaw”.
Thedrop-jawisspring-loadedbytwotorsionspringsbutisheldclearoftheliftropesbyaDCelectro-magnet.Threestrengthsoftorsionspringareavailabletosuitthemountingpositionandapplicationoftheropebrake.Thedrop-jawisreleasedbyanover-speedgovernororotherapprovedmeanssuchasthe“UncontrolledMovementDetector”(UMD-SRB01)availabledirectlyfromAtwellInternationalLtd.Whenthebi-directionalVGropebrake(VGRB2)isusedinconjunctionwiththeUncontrolledMovementDetector(UMD-SRB01)fullcompliancewithbothEN81-11998clause9.10andBSEN81-80:2003significanthazardnumber53andclause5.9.4.canbeachieved.WhenusedinconjunctionwitheithertheUMDorVGOSGwillalsocomplywithEN81-1:1998+A3:2009.
Whenthedrop-jawisreleased,theliftropesaretrappedbetweenthemovingandstaticjaws.Anysubsequentmovementoftheliftropescausesthedrop-jawtofullyengageandgeneratethebrakingforce.Theropecontactpressureiskepttoaminimumsoasnottodamagetheliftropes.
Thebrakeincorporatesasafetycontactforinclusionintothesafetycircuitoftheliftcontrolsystem.Untilthebrakehasbeeninspectedandreset,theliftcannotbeputbackintoservice.Thebrakeisresetbyhandwindingtheliftmotoruntilthedrop-jawreleaseswherebyitcanberesetmanuallyusingthein-builthandle.
Ifhandwindingisnotpossible,thenthedrop-jawassemblycanbereleasedbyslackeningthefourM12x25HexHeadexternalscrewssecuringthemovingjawassemblytothesideplates.Theboltscanthenbere-tightenedafterthejawhasbeenreset.
Overview
Turn key switch on UMD to reset.
Slacken 4 x M12 screws (19mm spanner) on front of the rope brake (green washers)
Turn key switch on UMD to reset.
Turn key switch on UMD Back to run.
3VG Rope Brake (VGRB2) Version 3.0
Tocontrolupwardfallingorpreventuncontrolledmovement,aVGropebrakemust generate a minimum dynamic braking force equal to the Out of Balance Load(OBL)oftheliftsystem.AnyresidualbrakingforceinexcessoftheOBLwilldeceleratetheliftcar.
TheVGropebrakeusesgrooveandfrictionformulaegiveninEN81tocalculatethetheoreticalstaticanddynamicforces.Theformulaearebasedontheropespeedandthegrooveprofileofgrippingjaws.
The permitted friction values are considered conservative and the braking forces are likely to be slightly higher than calculated.
Thedecelerationoftheliftwilldependonthemagnitudeoftheresidualbrakingforce,thetotalkineticenergyoftheliftsystemandanysystemlosses.
It is recommended that the dynamic braking force of the VG rope brake should be between two or three times the OBL of the lift system. This will provide a gentle and controlled deceleration of the lift without imposing high forces on the lift structure or damaging the lift ropes.
Toassistropebrakeselection,aspreadsheetprogramhasbeenpreparedtocalculatethetheoreticalstaticanddynamicbrakingforceforthegrooveprofileandspringforceselected(seepage7).Toensurethecorrectropebrakeconfigurationisselected,itisessentialtheenquiryform(seepage6)iscompletedasaccuratelyandascomprehensivelyaspossible.
Forcomparisonpurposes,theprogramalsocalculatestheropepressuregeneratedbya35degree“V”groovetractionsheavehavingthesamenumberandsizeofropes.
Thebrakingforceiscontrolledbythejawgeometryandthespringstackselectedusingtheapplicationprogramreferredtoabove.
Thetablebelowhasbeenpreparedforaliftwitharopespeedof1.5m/sec,a50%balanceandadynamicbrakingforcebetween2and3timestheOutofBalanceLoad(OBL).Thetableisindicativeonly.
DiscSpring BrakingForce-Newtons ContractLoad“Q”kg
Thickness Static Dynamic Maximum Minimum
2.0 mm 7160 6110 630 423
2.5 mm 12374 10554 1000 630
3.0 mm 16282 13886 1250 800
Braking Capacity
4 AtwellInternationalLimited
Theoretically,aVGropebrakecanbetailoredtosuitanyropespeed.Todatethebrakehasonlybeentestedonropespeedsupto5m/sec.
Theoreticalcalculationshaveproventhathigherspeedscanbeachievedbutwillresultinmoreropeslideandathigherropecontactpressure.
Thestandardropejawshaveamaximumwidthof150mm.Thiswillpermitamaximumof6ropesof13mmdiameterwithapitchof21mm.However,specialjawscanbesuppliedtosuitotherropingarrangements.
TheVGropebrakewillworkwithbothfibreandsteelcoredropes(steelcoreropesarepreferredasthesecanwithstandhigherclampingforces)ofallconstructiontypesandcanbeinstalledwithoutthenecessitytore-rope.
ItisrecommendedthatnewropesarefittedwheninstallingaVGropebrakeforthefirsttime.However,VGropebrakescanbefittedtoexistingropesprovidedthesearecheckedforsizeandwearbeforefittingtheropebrake.
Itisalsoessentialthattheropesarecorrectlyalignedandpitchedalongtheirentirelength,aropegathererfittedtotheliftropesabovethecounterweightmayberequiredinordertoachievethis.
Rope Factors
Thestandardgrooveprofileforthejawsisanundercut,semi-circulargroove.Thispermitsthemaximumbrakingforceforthelowestropecontactpressure.Thewidthoftheundercutcanbeoptimizedforeachapplicationusingtheapplicationprogram.Iftheundercutistoonarrowtoallowthebraketoself-generate,theprogramwilladviseincreasingthegroovewidth.
Thejawsarecasehardenedtoreducewearandareexpectedtowithstandnumerousfullspeedtestsbeforetheyneedreplacing.Whenoperatingtoprevent“uncontrolledmovement”,thenumberofoperationswillbegreater.
Themaximumrecommendedropecontactpressureis25N/mm2.Thisrepresentsa50:1safetyfactorofthetensilestrengthoftheropewirematerial.
Gripping Elements
5VG Rope Brake (VGRB2) Version 3.0
TheVGropebrakedoesnotrequireanexternalpowersourcetogeneratethebrakingforce.
AVGropebrakewillprovidethe“speedreducing”meansasrequiredinclauses9.10and9.11.4ofEN81-1:1998+A3:2009.The“speeddetection”meansisprovidedbyabi-directionalover-speedgovernor(VGOSG)orotherapproveddevices.Whenoperatingwithanover-speedgovernor,theVGropebrakeutilisestheauxiliarycontactsonthesafetyswitchtoreleasetheDCelectro-magnet.
Theropebrakecanalsobeusedtopreventanyformofuncontrolledmovementwhenoperatedbyasuitablecontroldevicesuchasthe“UMD-SRB01”detector.
RB2
Forthepreventionofoverspeedinginthe“up”directiononly1VGropebrakeisrequiredandtosimplifyinstallation,testingandmaintenance,itisrecommendedthattheVGropebrakeisoperatedbythecontrolunitRB2.Thisunitincorporatesabatteryback-upcircuittopreventspuriousoperationshouldthepowerbedisconnectedforwhateverreason.ThiswillkeeptheVGrope-brakedisengagedandfullyoperationalforaminimumof3hours.
Thecontrolunitincorporatestestbuttonsandindicatorlightstofacilitateroutinemaintenanceandinspection.
UMD-SRB01 – Uncontrolled Movement Detector
TheUMD-SRB01connectstothemainliftcontrolpanelandwillprovidepowerandbatterybackupfor2xVGropebrakesforaminimumof3hours.Fromhereitcanreceivepowerandsignalstotelliftheliftdoorsareopen,orthatthemainsafetycircuitisOKanddetectoverspeedconditions.
TheUMD-SRB01detectsmovementbymeansofaropesensorsystemthatcanbebolteddirectlytothetopoftheVGropebrakesoasthecarmovesthewireropesattachedtoitalsomovesandsorotatesthepulleywhichisconnectedtoa4channelencodersystem.
Whenthedoorsareopenthesystemischeckingforexcessivemovement.Excessivemovementoftheliftwhenthecar/landingdoorsareopenisfactorysetto150mm+/-30mm,butcanbeadjustedfrom0mmto900mm+/-30mmasrequired.IfexcessivemovementisdetectedthentheVGropebrakesunderitscontrolwillbedeployedandinadditiontothisanemergencystopsignalwillbesenttothemainliftcontrolpanel,thisisbymeansofinterruptingthemainsafetycircuit.
OverspeedsignalscanbedetectedfromeithertheoverspeedgovernorortheropesensorsystemandondetectionwilldeploytheVGropebrake.
Control Requirements
6 AtwellInternationalLimited
Enquiry Form (Example)
7VG Rope Brake (VGRB2) Version 3.0
Brake selection Program (Example)
Atwell Interna tional Limited
Bi-Directional VG Rope Brake
VGRB2 - Documentation Page 7 of 21 Version 1.0 24/01/2008
Ball Mill Top Business Park, Hallow, Worcester, WR2 6PD, United Kingdom
Tel: +44 (0) 1905 641881 Fax: +44 (0) 1905 641298 Email: [email protected]
8. Brake selection Program (Example)
Atwell International Job Reference W707/077
Customer Reference Lygon Street
Lift system variables Data Units Comments
Lift capacity "Q" 630 kg
Car mass "P" 1000 kg
Car load balance 50 %
Counterweight mass 1315 kg
Lift speed 1 m/sec
Roping ratio 1 enter 1 for 1:1; 2 for 2:1
Rope speed 1 m/sec
Number of ropes 4
Rope diameter "d" 13 mm
Rope pitch 21 mm
Spring Stack Configuration 4 Enter number 1 to 9
Spring Thickness 2.5 mm
Number of Disc Springs 5
Number of spacers 4
Groove data - undercut "U" groove Length of jaws 115 mm
percentage of groove undercut 50%
Width of undercut 6.5 mm Select groove width from chart
Rope Brake Clamping Force "F" 34200 Newtons
Rope contact area per jaw 5342 mm2
Contact pressure between rope and jaws 13.1 N/mm2
Rope Pressure on Traction Sheave 9.3 N/mm2 35
o "V" groove on 40:1 D:d ratio
Static Braking Force 11137 Newtons
Dynamic Braking Force 9988 Newtons
Force to overcome Out of Balance Load (OBL) 3090 Newtons
Dynamic Braking Factor "k" 3.23
Static Braking Factor "k" 3.60
Lift machine and motor data
Sheave Diameter 560 mm
Gear Ratio of drive unit 36
Motor Nominal Speed 1228 rpm
Motor and wormwheel inertia 0.05 refer to manufacturer's data
Flywheel inertia 0.15
Total high speed inertia 0.20 kgm2
Rotational speed of motor/flywheel etc 129 Rads/sec
Kinetic energy of motor/flywheel 1653 Nm
Kinetic energy of lift car and counterweight 1158 Nm
Kinetic energy of ropes, cables and pulleys 289 Nm
Total kinetic energy to be dissipated 3100 Nm
Dynamic Performance of Brake Residual Braking force to overcome Kinetic Energy 6898 Newtons
Deceleration of lift ropes 1.11 m/sec2
Rope slide through brake at lift speed 449 mm
Rope slide through brake at governor tripping speed
594 mm
Car slide at governor tripping speed 594 mm Governor Electrical tripping speed 1.15 m/sec Time of test 0.90 secs
8 AtwellInternationalLimited
TheVGropebrakeshouldbeinstalledusingbracketswhichwillfacilitateaccuratealignmentandadjustmentofthebrakesothatitisbothparallelandsquaretotheliftropes.Thebracketsmustbecapableofwithstandingthestaticbrakingforcecalculatedbytheapplicationprogramwithanappropriatemarginofsafety.
ItisrecommendedthattheVGropebrakeislocatedclosetothelifttractionsheaveordivertersheave(s).Itshouldbeinstalledwithaminimumclearancebetweenthestaticjawandtheliftropes.
Theminimumdistancebetweenthecentre-lineofthesheaveandthetopoftheropebrakejawis400mmwithamaximumclearanceof1mm.Asthedistancefromthesheaveisincreased,therunningclearancemaybeincreasedtoamaximumof 5mm(seefigureTD-RB4,page9).
Abi-directionalarrangementcanbelocatedbetweenthetractionanddivertersheaveprovidedthedistancebetweenthesheaveswillpermitthis.Thebrakesmustbefittedwiththecorrecttorsionspringtosuittheangleofinclination“A”.Abi-directionalarrangementcanalsobefittedtoeitherthecarorcounterweightsideorsingle“down”brakestobothcarandcounterweightropesasillustratedabove.
Singleropebrakesareonlyfittedtopreventoverspeedinthe“UP”directionandshouldbeusedinconjunctionwitha“DOWN”actingsafetygear.Whenusedinthisapplicationtheropebrakeshouldbefittedinapositionthattheropesaremovinginadowndirectionthroughtheropebrakejawswhenthecounterweightisalsomovinginthedowndirection.
Installation of the VG rope brake
Down direction of single rope brakes
Bi-directional arrangement consists of one brake for the “Down” direction and one brake for the “Up” direction
“Down” Brake
“Up” Brake
A
9VG Rope Brake (VGRB2) Version 3.0
TD-RB4
10 AtwellInternationalLimited
Installation VGRB2
Fig. 1 – As Delivered.
Liftthedropjawandfitthe“yellow”plasticremovablestoptothebackofthedropjaw.
Thiswillpreventthejawsbindingduringtheinstallation.
Fig. 2 – Splitting the rope brake
Usingthesupplied19mmspannerundoandremovethe4xM12HexHdScrewsandsplitthedropjawassemblyfromthefixedjawassembly.
Fig. 3 – Duplexing the rope brake
Usingthesuppliedjoiningplateduplexthe2ropebrakefixedjawassemblies.
EnsurethattheJawserialnumber“TAXXX”matchesthejawserialnumberonthedropjawassemblyandtheyareassembledasshownwiththedownbrakeonthetop.
Fit removable stopDrop Jaw
Fixed Jaw Assembly
Drop Jaw Assembly
M12 x 25mm Hex Head Screws
Down Brake
Jaw Serial Number Stamped here “TA XXX”
Joining Plate
M16 ct/sk screws
Up Brake
M16 Studs
11VG Rope Brake (VGRB2) Version 3.0
Installation VGRB2
Fig. 3 – Attaching mounting plates
Attachthemountingsideplatesasperthe installation’s requirements.
TheVGropebrakeissecuredtoitsmountingbracketsby4xM16screws.Each screw must react on half of thebrakingcapacityoftheVGropebrake.Basedonashearstressof100N/mm2,themaximumbrakingforcethesecanreacttois31.4kN.
Manymountingoptionsareavailablefrom Atwell International on request.
Fig. 4 – Fitting to the ropes
PositiontheassemblyaroundtheropesinaccordancewiththedrawingTD-RB4shownonpage9.
Fixthemountingplatesinpositionandsecure.
Theropebrakewillimposeadynamicloadonthefloororsteelworkofonly15%ofthestaticload.
Fig. 5 – Completed Assembly
Reattachthe2xDropJawassembliesensuringthejawserialnumbersmatchtherespectivefixjawassemblies.
Removethe“yellow”plasticstops.
ConnecttheelectricalleadsfromeithertheRB2orUMD-SRB01controlboxestotheelectricalplugonthefront.
Powerupthecontrolbox,liftthedropjawandcheckthemagnetholdsitclear of the ropes.
Mounting Side Plate (Example)
M16 Full NutM16 Spring WasherM16 flat washer
Traction ropes
Fix to existing floor or machine room steels
Down Brake
Electrical Connection Plug
M12 Hex Hd Screws
Up Brake
Removable Stop
12 AtwellInternationalLimited
Dimensions VGRB2 – single brake unit
Weight per rope brake = 24kgWeight of each standard side plate = 2kg
Standard Side Plate
Pivot handle back to enable the jaws to reset. Do not pull up vertically.
13VG Rope Brake (VGRB2) Version 3.0
Dimensions VGRB2 – duplexed brake units
Weight of above assembly = 56kg
Pivot handle back to enable the jaws to reset. Do not pull up vertically.
14 AtwellInternationalLimited
Dimensions VGRB2 – with UMD-SP01 sensor unit
100mm dia drive wheel
Traction Ropes
UMD-SP01
Sensor mounting plate
Sensor mounting bracket
2 x M6 x 16 mm screws with spring and flat washers per bracket
Sprung loaded tension bolts
Electrical connection plug
Tensioning Bolt Arrangement
M5 lock nut
M5 washer
Sensor plate
Spring
Support plate
M5 washer
M5 washer
M5 Skt screw x 55 mm
Alternative Tensioning Bolt Arrangement
15VG Rope Brake (VGRB2) Version 3.0
Wiring Diagram – RB2a Control Box
16 AtwellInternationalLimited
Wiring Diagram – UMD-SRB01 Control Box
17VG Rope Brake (VGRB2) Version 3.0
VG rope brake with RB2 Hand Winding Instructions
VG Rope Brake InstalledDisengage Before Hand Winding Machine
RELEASE INSTRUCTIONS
1. INVESTIGATEREASONFORENGAGEMENTANDCARRYOUTAPPROPRIATEACTION.
2. CARRYOUTVISUALINSPECTIONOFROPEBRAKE.
3. READLOCALHANDWINDINGINSTRUCTIONS.
4. HANDWINDINTHEDOWNWARDTODIS-ENGAGETHEROPEBREAK.
5. TURNKEYSWITCHTO“RESET”POSITION.
6. SLACKEN4XM12SCREWSWITHGREENWASHERSONTHEFRONTFACEOFTHEDROPJAWASSEMBLY.
7. USINGROPEBRAKEHANDLELIFTDROPJAWFREEOFROPES.
8. CHECKLED’S1,2,3&4AREILLUMINATED.
9. RE-TIGHTEN4XM12SCREWSWITHGREENWASHERSONTHEFRONTFACEOFTHEDROPJAWASSEMBLY.
10.TURNKEYSWITCHTO“RUN”POSITION.
18 AtwellInternationalLimited
VG rope brake with UMD-SRB01 Hand Winding Instructions
Bi-Directional VG Rope Brake Installed
Disengage Before Hand Winding
RELEASE INSTRUCTIONS
1. Checkthevisualdisplaysonthe“UMD-SRB01”controlbox.
2. CarryoutvisualinspectionoftheVGropebrakes,checkingwhichbrakehasfullyengaged.
3. Investigatereasonforengagementandcarryoutappropriateaction.
4. Readlocalhandwindinginstructions.
5. Onthe“UMD-SRB01”controlpanelinsertthekeyandturntothe“RESET”position.
Note:Anaudiblealarmwillsounduntilthekeyisreturnedtothe“Run”position.
6. Onthedeployedbutnotfullyengagedropebrake,usingtheropebrakehandlere-engagethedropjawwiththeelectro-magnet.Checkthe“ROPEBRAKESET”LEDislitonthe“UMD-SRB01”controlpanel.
7. Handwindthemachineintheoppositedirectionoftheengagementforapproximately25mm.Thiswillfreethedropjawfromtheropes.
8. Usingtheropebrakehandlere-engagethedropjawwiththeelectro-magnet.Checkthe“ROPEBRAKESET”LEDislitonthe“UMD-SRB01”controlpanel.
9. Continuefollowingthelocalhandwindinginstructionsforthegearedmachine.
NOTE:Ifnopowerandthebatterybackuphasfailed,releasethedropjawandinserttheplasticmechanicalstopstothebackofthedropjaw.
TO RE-INSTALL LIFT SERVICE FOLLOWING HAND WINDING
1. EnsurebothropebrakesareresetandthecorrespondingLEDsonthe“UMD-SRB01” are lit.
2. Ensurethereasonforengagementhasbeeninvestigatedandappropriateactiontaken.
3. Turnkeyswitchbackto“RUN”positionandremovekey.
4. Check lift is working correctly.
19VG Rope Brake (VGRB2) Version 3.0
Maintenance At6monthlyintervals,thefollowingchecksshouldbecarriedout-
1) the“dropjaw”shouldbereleasedandthebrakecheckedthattheropesarebeingclampedbetweenthe“dropjaw”andthestaticjaw.
2) thatthetopofthe“dropjaw”isbetween10and12mmabovethetopofthestaticjawwhenthe“dropjaw”isreleased.Ifthe“dropjaw”islessthan10mm,thiscouldindicatethateithertheropesor“dropjaw”haveworn.Wornjawswillhavetobereplaced.
A limited amount of rope wear can be accommodated by re-setting the rope brake as per instructions on page 23. This should be carried out by a competent person. Please contact the manufacturers (Atwell International) should this need to be done.
3) thattheropebrakesafetyswitchhasoperated,thiscanbedonebyreleasingtheelectro-magnetandcheckingthattheredLEDonthecontrolboxisilluminated.
4) thatthe“dropjaw”linkagemovesfreelywhenoperatedbyhand.
5) Ensuretheback-upbatteryisatasufficientcharge.Notethebatteryrequireschanging after 3 years from installation.
ContactAtwellInternationalLtdforanyspares.
Theonlymaintenancerequiredistospraythelinkarmsandthediscspringswithawaterrepellentlubricantifthereisanysignofatmosphericcorrosion.
20 AtwellInternationalLimited
Typical Installation of VG rope brake and UMD-SRB01
Item No. Description Comments
*1 UMD-SRB01ControlBox Suppliedwithwallmountingbracketsandfixings
*2 ElectricalConnectionHood 32mmconduitfittings
*3 ConnectionCabletoDownBrake Pre-wiredtoconnectionsocketoneend(5mtrslong)
*4 ConnectionCabletoUpBrake Pre-wiredtoconnectionsocketoneend(5mtrslong)
*5 ConnectionCabletoUMD-SP01 Pre-wiredtoconnectionsocketoneend(5mtrslong)
*6 UMD-SP01 MovementSensorPackandMountingBracket
*7 VGropebrake“Down” SuppliedwithJoiningPlateandfixingsorstandardsideplatesandfixings
*8 VGropebrake“Up” SuppliedwithJoiningPlateandfixings
9 Side(angle)mountingplates Variousoptionsavailableonrequest
10 MountingPlate Variousoptionsavailableonrequest
11 Connections to Lift Control Panel Customerconnections(seepage13)
12 TractionSheave Existingequipment
13 MachineBedplate Existingequipment
14 MachineRoomSteels Existingequipment
15 DiverterSheave Existingequipment
16 Traction Ropes Existingequipment
*Items1–8aresuppliedasstandardwhenorderingabi-directionalVGropebrakewithuncontrolledmovementcontrol.
21VG Rope Brake (VGRB2) Version 3.0
Mounting Brackets Design Calculations
TofacilitatetheinstallationoftheVGropebrake,AtwellInternationalcan providemountingplatesandsideplates.Thesebracketsaredesignedinaccordancewiththeliftinstallationandareverifiedbyuseofthefollowingprogrammeandinconjunctionwithdrawing“BI-DIRECTIONALMOUNTINGBRACKETDESIGN–FILE2ROPE6”.
Calculated result for thickness of base plate
Alternative design
22 AtwellInternationalLimited
Bi-Directional Mounting Bracket Design “FILE 2ROPE6”
23VG Rope Brake (VGRB2) Version 3.0
Adjusting the rope brake to allow for rope wear
THIS PROCEDURE SHOULD ONLY BE CARRIED OUT BY A COMPETENT PERSON FOLLOWING DISCUSSION WITH ATWELL INTERNATIONAL OR ITS APPOINTED REPRESENTATIVE
Whenassembledandadjustedcorrectly,thedrop-jawmustclamptheropeswhenitis10to12mmhigherthanthestaticjaw.Thisisspecifiedasdimension“h”infigureTD-RB7.Thiswillensurethattheropebrakewillself-actuatewhenthedrop-jawisreleased.Toachievethis,proceedasfollows:-
1. Onthetopropebrakeonlylowerthedropjawontheropesandmeasuretheheight“h”whenclampingtheropes.Ifthisisoutsidetherange10to12mm,adjustthesettingnuts,oneflatatatimeinrotationuntilthisisachieved.
NB: tightening the setting nuts will reduce the height “h”. Conversely, slackening the nuts will increase the height. To determine how many turns to adjust the setting nut, please refer to the chart
Forexample,if“h”measures16mm,subtract2.4mmfrom3.2mm(thesettingdimensionat11mmminusthesettingdimensionat16mm)togiveadifferenceof 0.8 mm.
Aturnofoneflatofthesettingscrewswillmovethenut0.25mm.Therefore,eachnutwillneedtobetightenedby3flatstoreducetheheightto11mm.
2. Whenadjustedcorrectly,markeachnutandsealwithredpaint.
The dimension “h” should only be changed by altering the setting nuts located inside the terminal box.
Dim “h”Setting (mm)
25 0
24 0.3
23 0.6
22 0.9
21 1.2
20 1.5
19 1.7
18 2.0
17 2.2
16 2.4
15 2.6
14 2.8
13 2.9
12 3.1
11 3.2
10 3.4
9 3.5
8 3.6
7 3.7
Correct Setting Height
Remove front cover to expose 4 x M18 adjusting nuts
24 AtwellInternationalLimited
Frequently Asked Questions
Will the VG rope brake damage the ropes?
No.ItwasafundamentalrequirementthattheVGropebrakedidnotcauseanysignificantdamagetotheropes,evenafterrepeatedtestingonthesameinstallation.Aftertesting,allthatisevidentisa“polishingaway”oftheropelubricantwherethejawshavecontactedtherope
Will the VG rope brake impose additional reactionary loads on to the machine room floor or steels?
No.Machineroomfloorsandsteelworkmustbedesignedtotakeadynamicloadequaltothestaticloadofthelift,i.e.twicethestaticload.TheVGropebrakewillimposeadynamicloadonthefloororsteelworkofonly15%ofthestaticload.
Which control unit should be used with the VG Rope Brake?
Iftheropebrakeistobeusedtoarrestoverspeedinthe“UP”directiononly,thenthecontrolbox“RB2”shouldbeused.
IftheropebrakeistobeusedtoarrestoverspeedandpreventmovementoftheliftcarineitherdirectionwiththedoorsopenthenthecontrolboxUMD-SRB01shouldbeused.Pleaserefertothe“OperationandmaintenanceManualfortheUncontrolledMovementDetector”forfurtherinformation.
What is the minimum space required between the centre line of the ropes and the machine room wall/upstands?
Theminimumdimensionfromtheropebrakebackplatetothecentrelineoftheropesis38mm.Pleaserefertothedimensioneddrawingsonpage12and13formoredetailedinformation.
What is the maximum capacity of the rope brake?
TheVGropebrakehasbeentestedforliftspeedsupto5m/sec.Thisisregardlessofthemassoftheliftcar,theVGropebrakeonlyhastobraketheOutofBalanceLoadandnotthefullmassoftheliftsystem.Theeffectofdifferentcarandmotormassesistochangetheslidedistance.Seebrakeselectionprogramonpage7.
What is the voltage and wattage of the electro– magnet?
Thestandardvoltageforthebrakecoilis12VoltsDC.Othervoltagesareavailabletospecialorder.Thepowerconsumptionofthestandardcoilisonly4watts.
Other quality products available from Atwell International:
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