Stromag Limited 29 Wellingborough Road RushdenNorthamptonshireNN10 9YEUnited KingdomTel. (+44) 0 1933 350407Fax. (+44) 0 1933 358692e-mail. stromagltd@Page 2JCB110698Electromagnetic Fail Safe Brakes Series NFA/NFF Stromag Versions:Basic & Dockside CranesStromag Limited29 Wellingborough Road,RushdenNorthamptonshire · NN10 9YE · United KingdomTel. 01933 350407 · Fax. 01933 358692e-mail stromagltd@CB110698Page 3NFA / NFF SERIES BRAKEAdvantages:Comprehensive range 20 -10,000 Nm.Simple assembly to motor, no dismantling of brake required.Concentricity through body for Tacho fixing.No setting required when changing discs, therefore eliminating human error.Compatibility of consumable spares.Simple maintenance, once only adjustment by shim removal.Positive feel hand release mechanism.Proven reliable design.Sealed inspection holes for Airgap / Lining wear.Extremely low inertia.High heat dissipation.Free from axial loads when braking and running.Suitable for vertical mounting (subject to conditions).Many optional extras available.Facilities to design to customer's special requirements.Protection available up to IP66."Asbestos free" linings as standard.Holding and Working brake variations.===============================================================Voltages Available:Standard 24v DC, 97v DC (110v Rectified), and 198v DC (220v Rectified).Other Voltages available.Coils available to suit : AC Supplies with Integral Half and Full Wave rectification.We suggest the following alternative - Customer to take standard voltage 24V / 110VDC, and we can provide Transformer Rectifier unit.Page 4JCB110698Brake Operation :Brakes switched on the DC side. (This will achieve fastest response times).Brakes are FAIL SAFE ie. Spring Applied.Power on to release.When the coil (2), is energised, the magnetic flux attracts the armature plate (3), to the coil body (1), this compresses the springs (8), and releases the brake disc (4).Micro Switch :Optional availability, Inboard Proving Switch, one common contact, one normally open contact and one normally closed contact.This can be interlocked with motor contactor for parking brake duty, ie. brake release before starting motor.Brake Termination :Three standard versions :1) Flyaway leads, usually 1 metre long through PG Cable Gland in Body.2) IP66 Terminal box, for easy connection and removal,3) Versions for AC supply with built-in Full Wave or Half Wave rectification inside the Terminal Box.Please note that when the brake is electrically connected to an AC motor and switched on the AC side, care must be taken so that the load does not drive back into the motor and generate a voltage that may hold the brake off.I.e. in hoist and lift applications. If in doubt please contact the Stromag technical department.Emergency Hand Release Lever :This is set in our works, no setting is required over maximum lining wear.Special Bearing mechanism for easy operation and positive feel.Emergency Jacking Screws available if Hand Release Lever not supplied.Brake Flange :Manufactured to suit our Brake and your Motor.Condensation Heaters :Inboard condensation heaters can be providedTacho / Encoder :Can be provided as optional extras.Special Surface Finishes :Most of the components can be treated with a protective surface coating for arduous environments; ie. Dockside Cranes / Deck mounting etc.CB110698Page 5CALCULATIONSFull Load Torque = FLTLoad Torque = NmTorque = NmKilowatts = Kw9550Speed = rpm Initial Torque, size of brake = FLT x Factor (25% - 200%)Calculating Maximum Stops per Hour using Braking Tables Example:-Motor 15 Kw @ 1500 rpmJ = Total Inertia of Load + Motor = 2.04 Kgm2T L = Load Torque = 20 NmT S = Brake Torque = 100% FLTMotor FLT = Kw x 9550 = 15 x 9550 = 95.5 Nmrpm 1500Brake selection NFA 10 (100 Nm)KJ per switching = J x N2 x TS182000 TS ± TL= 2.04 x 15002 x 100182000 100 + 20= 25.21 x 100 = 21 KJ per switching 120From NFA Braking Tables @ 1500 rpmNFA 10 Brake will stop approx. 40 times per hour.To Calculate Stopping TimeStopping Time = J x rpm9.55 x (TS ±TL)Example:-NFA 10 (100Nm)15Kw @ 1500 rpmMotor and Machine MOI = 2.04Kgm2T L = 20 NmStopping Time = 2.04 x 15009.55 x (100 + 20)Stopping Time = 2.67 seconds + Brake response timePage 6JCB110698NFA Basic Size 2 (20 NM) – Size 1000 (10,000 NM) ApplicationsGeneral engineering brake for a variety of applications.Standard FeaturesCoil Body Class F insulation and platingOuter Body Manufactured in standard Aluminium with PG9 Airgapinspection plug.Armature Plate Standard FinishBrake Flange Standard FinishFriction Lining Low wear rate with low torque fade over widetemperature band. High thermal capacity.End Cover Manufactured in standard AluminiumHub Mild SteelFixings All standard 12.9 Grade Cap ScrewsFlying Leads 1 metre longOptional Extra’s Hand Release LeverTacho/Endcoder ProvisionTerminal BoxMicro-proving SwitchWear detection switchCondensation heatersAdjustable brake torqueSwitching ModulesHalf WaveFull WaveForcing UnitsQuick SwitchingBuilt in Terminal boxOr Free-standingCB110698Page 7NFF Dockside Size 2 (20 NM) – Size 1000 (10,000 NM)ApplicationsDockside/Harbour and Marine Crane brake suitable for Seawater environment.Standard FeaturesCoil Body Class F insulation and platedOuter Body Manufactured in sea water proof aluminium with largeinspection holes and sealed bearing hand release provision. Armature Plate Special protection: Nitrided or PlatedBrake Flange Special protection: Nitrided or PlatedFriction Lining Low wear rate with low torque fade over wide temperature band.High thermal capacity.End Cover Manufactured in sea water proof aluminium with provision forcondensation heater.Hub Stainless SteelFixings All Stainless SteelFlying Leads 1 metre longSeals For high protectionAdjustable brake torque Simple adjustment with C spannerOptional Extra’s Hand Release LeverTacho/Endcover provisionTerminal BoxMicro-proving switchWear detection switchCondensation heatersSwitching ModulesHalf WaveFull WaveForcing UnitsQuick SwitchingBuilt in Terminal BoxOr Free StandingPage 8JCB110698CB110698Page 9Brake Size 24 6.310162540631001602504006301,000Torque (Working)Nm 2040631001602504006301,0001,6002,5004,0006,30010,000Torque (Holding)Nm 3060981402403605809501,4602,3603,7006,0309,27014,700Max Speed Min -15,3004,9004,5004,1003,8003,5003,2003,0002,8002,2001,9001,6001,4001,200Moment of Inertia J - B Side kgm 20.00040.000430.000730.001280.001350.003250.007750.013750.025750.149250.23850.4330.913251.66425Weightkg 5.57.38.610.914.4213444.570120165220325481Nominal Voltage (DC)* *v 2424242424242424110110110110110110Nominal Wattage w 8067103110124149170249270325400482601587Nominal CurrentA 3.34 2.81 4.28 4.57 5.18 6.27.110.4 2.46 2.95 3.64 4.38 5.47 5.34Air Gap Normal 0.60.60.60.60.60.60.60.60.60.60.60.60.60.6Air GapMax 11 1.2 1.2 1.2 1.2 1.3 1.5 1.6 1.6 1.8 1.82 2.1a 150165175190225250270314350440500560650750b 135152162175205225250292325418472530620710c 120140140160180200220240270340390460530600d max H72530* 40* 404550606080110120130140160e 55556068.27678.59096100200215240270300h 3034322731313333343333333333l 73.589.692.895.3104121141145168182.6191226225265m 10.57.810.61514.51714.25212024.421.426.33030n 2.5 2.5 2.5 3.5 3.5 3.5445 5.55566p 242830303555455575125130150185210s 7.57.57.5109101012101010101010t123140150146168172184230# 230270280320340380 6screwsk M5M6M6M6M8M8M8M10M10M12M16M16M16M20f478080658090105120158220255280320330* * Other Voltages Available * With t2 keyways Din 6885 (2)# 255 when adjusting nut requiredStromag Electromagnetic Spring Applied Brake Series NFA (Basic Design)Page 10JCB110698Brake Size24 6.310162540631001602504006301,000M 115.5128.5128125151165179196238260290327364420K 179.5203198210245276300343376J 20.92829293239404554Refer to StromagL 95110110123140150170200220X 1933.7533.753848628386113125.5133.5168172182Q110110110110110150150250500Dimensions not given are available on requestConsult chart before orderingSeries Size 1st Digit BasicDesign Brake Flange Hand Release Lever M/C for Tacho AdjustableTorque2nd Digit Terminal Box PG Gland Micro Switch RectifierHeaterB lA l C lB l lD l l C lEl l D l l NFAF ll l E l l lG l F l l H l lGl l K l H l l lL l l K l l MlllL l l l M l l l Nlll lExample :- NFA 63 EC-24v DCIs a Brake Size 63 (630Nm) with Hand Release, Zag 3 Terminal Box with PG11 Gland and 24v DC CoilStromag Electromagnetic Spring Applied Brake Series NFA (Basic Design)Jack Off Screws are suppliedloose for emergency release Protection available up to IP66Special variations available on requesta) Terminal Box, Large ZAG6b) Proximity Sensorc) Wear Detection SwitchBrake Size24 6.310162540631001602504006301,000M 115.5128.5128125151165179196238260290327364420K 179.5203198210245276300343376J 20.92829293239404554Refer to StromagL 95110110123140150170200220X 1933.7533.753848628386113125.5133.5168172182Q110110110110110150150250500Dimensions not given are available on requestConsult chart before orderingSeries Size 1st Digit BasicDesign Brake Flange Hand Release Lever M/C for Tacho AdjustableTorque2nd Digit Terminal Box PG Gland Micro Switch RectifierHeaterB lA l C lB l lD l l C lEl l D l l NFFF ll l E l l lG l F l l H l lGl l K l H l l lL l l K l l MlllL l l l M l l l Nlll lExample :- NFF 63 EC-24v DCIs a Brake Size 63 (630Nm) with Hand Release, Zag 3 Terminal Box with PG11 Gland and 24v DC CoilStromag Electromagnetic Spring Applied Brake Series NFF (Dockside)Optional AccessoriesJack Off Screws are suppliedloose for emergency releaseProtection available up to IP66Special variations available on requesta) Terminal Box, Large ZAG6b) Proximity Sensorc) Wear Detection SwitchTabulated Permissible Heat / Energy CapacitySeries NFA / NFFEnergy KJ / Switching @ 1000 RPMBrake Size24 6.310162540631001602504406301,000117.714.6274562921542092985407028419961,304517.714.6274562921542092984485827148621,1431017.714.6274562921542092963644806007389902017.714.627425464891101481942733775137393013.69.718.92836435973991291822513424934010.27.314.22127324455749713618825636960 6.8 4.99.41418213037506491125171246100 4.1 2.9 5.78.511131822303955751021471,0000.410.290.570.851.11.31.82.23.03.95.57.510.214.7Energy KJ / Switching @ 1500 RPMBrake Size24 6.310162540631001602504006301,000117.714.627456292154209298373476570672880517.714.6274562921542092903234185086088031017.714.6274562921542022432773624485447243013.69.718.92836435973991291622513424934010.27.314.22127324455749713618825636960 6.8 4.99.41418213037496491125171246100 4.1 2.9 5.78.511131822293955751031471,0000.410.290.570.851.11.31.82.22.93.95.57.510.314.7Energy KJ / Switching @ 3000 RPMBrake Size24 6.310162*********17.714.627456292154209298517.714.6274562921542092901017.714.6274562921542022433013.69.718.92836435973994010.27.314.221273244557460 6.8 4.99.4141821303749100 4.1 2.9 5.78.511131822291,0000.410.290.570.851.11.31.82.22.9Note:- The number of switchings must be spread evenly over an hourS w i t c h i n gS w i t c h i n gS w i t c h i n g165946731219291081Supplied Encapsulated22627112215The user of the brake must observe the respective regulations for prevention of accidents (Law applicable to working means).Spare part orders should indicate the following data:-1) Stromag Ref. No.2) Series and Size 3) Item and NumberConstruction & FunctioningThis brake is a fail safe spring-applied double faced brake, with electromagnetic release. When the coil is de-energised the pressure springs (19) push the armature disc (4) axially against the friction lining assy. (5). This is clamped between the armature disc (4) and the brake flange (7) thereby preventing rotation.The braking effect is transmitted through the friction lining carrier (5) to the shaft by way of a splined driving hub (6). When the coil is energised, the armature disc (4) is attracted towards the coil body (1) by electromagnetic force overcoming the pressure springs (19). Thereby the friction lining assy. (5) is released.AssemblyThe hub should be fitted to the shaft and retained by a good fitting key and axially located. The assembly to the motor is simple, no dismantling of the brake is required.Offer brake onto the motor spigot ensuring friction lining and assy. (5) is centralised.Tighten fixing screws (23) to correct bolt tightening torque (as specified on the drawing). Terminate brake as per wiring diagram in terminal box.Seal face between brake and motor with Hylomar gasket sealer to conform to IP 65.Emergency ReleaseNFA/NFF Version : By pulling the hand lever towards the back of the brake theWith Hand Release armature (4) is moved axially until it is lying against the coil body Lever (1), thus the friction assy may rotate freely.NFA /NFF Version :By inserting the Jack Off screws through the coil body into the Without Hand armature and tightening, the armature is moved axially against Release Lever the coil body, thus the friction assy may rotate freely.Attention: These measures shall be applied during maintenance, assembly or emergency conditions only.Operating Instructions for ElectromagneticSpring applied NFA / NFF Brake (Construction & Assembly)StromagIn the course of the working life of the brake, an increase of the airgap between coil body (1) and armature disc (4) will occur.For correct operation of the brake, ensure that the airgap maximum (rate specified in the drawing) is not exceeded, if the airgap is greater than this, re-adjust to normal dimension (also specified in drawing).To check the airgap dimension remove the inspection cover (22) and place a non-magnetic feeler gauge between the coil body (1) and armature (4).THERMAL CAPACITY; The brake is capable of absorbing a certain amount of energy during one emergency stop (As stated in the charts in our catalogue).Ensure all excessive dust and contamination is removed (this may impair operation of the micro switch).Strip brakes after commissioning and clean.Term of inspection six monthly, thereafter adjusted from evidence found.IF THERMAL CAPACITY IS EXCEEDED INSPECTION OF FRICTION LININGS,ARMATURE BACKPLATE AND COIL IS REQUIRED.Re-adjustment of the airgapIf the maximum airgap is reached, a re-adjustment to the normal airgap dimension must be made, this is done as follows:-Remove screws (23,25) dismantle coil body assembly and non magnetic outer body (2)from brake flange (7) taking care not to lose pressure springs (19) or damage armature plate(4).Remove shim (3) and re-assemble. The armature may be retained in position by using the emergency release screws. Ensure these are removed after re-assembly.Note: If the shim has previously been removed, a new lining assembly (5) together with shim (3) has to be fitted.Attention: On assembling the brake or replacing the friction lining assembly, care should be taken that the linings do not come in contact with grease etc. Greasy substances if any, can be removed by suitable degreasing agents. Never use petrol or paraffin.NOTE; USE ONLY GENUINE Stromag FRICTION LINING SPARES WHICH ARE NON ASBESTOS.StromagOperating Instructions for ElectromagneticSpring applied NFA / NFF Brake (Construction & Assembly)StromagStromagHousing colour for Halfwave version: BlackHousing colour for Fullwave version: GreyBy removing wire link and connecting instead, a contact (or No. of contacts in series) the D.C. output to coil is switched on the D.C. side of the Rectifier giving a 4 to 8 times faster application of the Brake (t2).Electrical connection via a 6 pole Terminal Block.Stripping length for cable: 6mm/0.25”.Cable size: 0.5mm - 2.5mm.EGV 500-5 Halfwave Rectifier Unit for Max. 500vAC Input, 1.8 amps Max. output.BG 270-5 - Fullwave Rectifier Unit for Max. 270vAC Input, 1.8 amps Max. output.The input and output for both types of Rectifier Unit are protected against overvoltage by Varistors.The Halfwave version EGV 500-5 also incorporates a Varistor to protect the D.C. switch contacts.Customer: __________________________________________________ Installation Site if known: ______________________________________ Enquiry No: _____________Order No: __________________Brake Size and Description: _________________________ See Catalogue IP Protection required: IP __________ Input Voltage: ___________ AC / DCHeater (Anti-condensation ) Voltage 110v / 240v ACHand Release Lever: Y / NVertical / Horizontal Shaft Application: H / VBore Requirements: _____________________________ Keyway Requirements: ___________________________Backplate Spigot dimensions: _______________________ Male / Female Terminal Box: Y / N Size: Large (Zag 6) Small (Zag 3) End Cap Fitted: Y / NTacho Fitted: Y / N Fixing Dimensions: __________________________ Additional machining / Special Requirements:Previous Order Ref. _____________________________________________Special adapter/adapters mounting plates or seals etc. Please specify. ____________________________________________________________ ____________________________________________________________ ____________________________________________________________StromagORDER CHECK LISTNFF/NFA/NFH SeriesWe have supplied since 1988 in excess of 3000 NFA/NFF Brakes for high protection,Dockside Crane applications.The following Motor Manufacturers have used our Brakes:-Bull Electric Siemens Thrige Scott Marelli Mawdsley Sicme Motori David McClure IEG AnsaldoBrook CromptonVME A.B.B.Hyosung Teco AEG BauerMagneticThey have been used on the following Cranes: -Morris’s Stothert & Pitt Butterley MWG MagriniB.M. Titan KHIC Rolls RoyceSchnieder ImsaStreetInstallations Include: -Felixstowe Hong Kong Miami Southampton Pusan Port S. KoreaPenang Calcutta Cork Singapore Bombay Dundalk VancouverMadras Limerick Hull Tanjin Tilbury Immingham ShanghaiCharlstonFraser River StromagREFERENCE LISTStromag AGD-59411 Unna, Postfach 2123 . D-59425 Unna, Hansastr. 120 . Tel. (02303) 102-0 . Fax. (02303) 102-201。