WE KNOW BRAKES

Our Drum brakes

Johnson designs and manufactures a range of drum brakes in our factories, typically these are spring-set electrically released brakes.   We have electrical brakes available for all standard AC and DC voltages.  There are also custom designs which are engineered to suit customer specific requirements.  Johnson drum brakes come standard with automatic lining wear compensation.  The standard options available for Johnson drum brakes are listed here:

  • 12 to 600 VDC
  • All 3 phase and single phase Voltages 50/60Hz
  • AISE Shunt & Series DC
  • DIN 15435 AC & DC
  • Flameproof AC & DC
  • Hydraulic Over-Ride
  • Manual Release
  • Automatic Wear Adjustment
  • Release & Wear Switches
  • Dust-Tight Magnetic Enclosures
  • Electric Modulation Control
  • Internal or External Springs
  • DC Magnetic Drum Brakes

    01

    SMAA model Magnetic DC Voltage Drum Brake

    Spring applied / Electrically Released

    03

    GDA500 General Duty DC Magnet Drum Brakes

    Spring applied / Electrically Released, US Navy High Speed Hoist Brakes

    Spring Set DC electrically Released Drum Brakes:

    Industry Type:

    • General Industrial Code, Prefix: GDA
    • Steel Industry Standard, Prefix: SDA
    • High Integrity Nuclear, Prefix: HDA

    Dimensions:

    • Metric as DIN standard code: DL
    • Imperial as A.I.S.E. standard code: SMAA
    • Also non-standard drum sizes and base fixings

    Construction:

    • Fabricated steel mechanism
    • Ductile iron brake shoes
    • Major pivots non-ferrous bushed
    • All pins ground stainless steel (lubricators optional)
    • Friction linings high temperature non asbestos

    Magnet:

    • -DC tractive type with encapsulated coil

    Special Options:

    • Self adjusting mechanism (compensating for wear)
    • Mechanical release lever
    • Limit switches to monitor release/ set or wear
    • Hydraulic override by remote pedal
    • Special materials and finishes as required including high integrity specifications
    • Separate enclosed control units for DC or AC supplies

    Applications:

    • Mechanical handling equipment, cranes, winches, elevators, lifts, also rolling mills, mixers etc.

    Engineering:

    • Design and selection assistance available always

    DIN Brake Model Data:

    BRAKE
    MODEL
    DRUM
    DIA. “D”
    MAGNET SIZE TORQUE
    MAX.
    WEIGHT
    mm Nm kg
    GDA100 100 DA100 32 11
    GDA160 160 DA160 80 28
    GDA200 200 DA200 213
    46
    GDA250 250 DA250 362 64
    GDA315 315 DA315 565 100
    GDA400 400 DA400 1487 246
    GDA500 500 DA500 1900 264
    GDA630 630 DA630 5885 620

     

     

    AISE Brake Model Data:

    BRAKE
    MODEL
    DRUM
    DIA. “D”
    MAGNET SIZE TORQUE
    MAX
    WEIGHT
      in   Lbft Lb
    SMAA4 4 DA100 24 25
    SMAA6 6 DA160 59 62
    SMAA8 8 DA200 157 101
    SMAA10 10 DA250 267 141
    SMAA13 13 DAH315 626 220
    SMAA16 16 DA400 1097 542
    SMAA19 19 DAH500 2620 816
    SMAA23 23 DA630 4000 1367
    SMAA30 30 DA710 9000 1500

    Magnetic Brake Actuator Data:

    • Short stroke DC tractive type, all fabricated steel construction
    • Resin encapsulated coil with Class F insulation
    • Optional replaceable coil arrangement
    • 100% continuously rated up to 40ºC
    • Airgap dust and drip protected by neoprene qaiter
    • Terminal Box IP55 standard enclosure

    Brake Selection:

    Characteristics of DC Magnetic Drum Brakes

    All DC magnets tend to inherently show reponse due to build up and decay of the magnetic field. The actual times are dependent on brake magnet size and vary with excitation voltage, coil temperature and spring loading (torque). The magnet stroke which increases as the brake linings wear will also influence set and release times.

    Coil Forcing DC Magnets (Shunt wound voltage operated)

    Brake release and set times can be reduced by using an economy circuit. This separate brake control unit will initially apply full voltage to release the brake magnet, after a set time period the circuit will drop voltage to only hold off the brake. Control units are enclosed ventilated drip proof IP22 for DC supplies or totally enclosed IP55 with rectifier for 1 or 3 phase AC supplies.

    Series Wound DC Magnets (Current Operated, usually inline with motor drive)

    For use with crane rated DC series hoist motors to release the brake at 40% motor full load current and hold off at 10% current.
  • Thruster Drum Brakes

    01

    SMLB Thruster Drum Brake with internal springs as shown with R.S.B. drum

    02

    SMLB10-EJ050/6 Thruster Drum Brake

    03

    SMLB10-EJ050/6 Thruster Drum Brake

    Spring Set 3 Phase Thruster Released Drum Brakes:

    Industry Type:

    • General Industrial Code, Prefix: GDL
    • Steel Industry Standard, Prefix: SDL
    • High Integrity Nuclear, Prefix: HDL

    Dimensions:

    • Metric as DIN standard code: DL
    • Imperial as A.I.S.E. standard code: SMLA
    • Also non-standard drum sizes and base fixings

    Construction:

    • Fabricated steel mechanism
    • Major pivots non-ferrous bushed
    • All pins ground stainless steel
    • Friction linings high temperature non asbestos

    Thrusters:

    • Standard Eltma Elhy EB series IP56 enclosed

    Special Options: -Self adjusting mechanism

    • Mechanical release lever
    • Limit switches to monitor release/ set or wear
    • Hydraulic override by remote pedal
    • Electronic modulated torque by remote pedal
    • Reverse brake mechanism thruster to apply
    • Soft stop, or soft set
    • Special materials and finishes as required, including high integrity requirements.

    Applications:

    • Mechanical handling equipment, cranes, winches, stacker reclaimers, ski lifts, and conveyors etc.

    Engineering:

    • Design and selection assistance available always

    DIN Brake Model Data:

    BRAKE
    MODEL
    DRUM
    DIA. “D”
    THRUSTER
    MODEL RANGE
    TORQUE
    RANGE
    WEIGHT
    mm Nm kg
    GDL160 160 EB120-EB220 79 to 131
    29
    GDL200 200 EB120-EB300 127 to 344
    33
    GDL250 250 EB220-EB50 285 to 680 39
    GDL315 315 EB300-EB80 505 to 1235 80
    GDL400 400 EB50-EB125 1080 to 2860 112
    GDL500 500 EB80-EB150 3380 to 6000 181
    GDL630 630 EB125-EB250 3700 to 7150 281
    GDL710 710 EB250-EB3000 7750 to 10700 388

    AISE Brake Model Data:

     

    BRAKE
    MODEL
    DRUM
    DIA. “D”
    THRUSTER
    MODEL RANGE
    TORQUE
    RANGE
    WEIGHT
    in Lbft Lb
    SMLA6 6 EB120-EB220 58 to 96
    64
    SMLA8 8 EB120-EB300 94 to 254
    73
    SMLA10 10 EB220-EB50 210 to 500 86
    SMLA13 13 EB300-EB80 375 to 911 176
    SMLA16 16 EB50-EB125 797 to 2110 246
    SMLA19 19 EB80-EB150 2494 to 4428 398
    SMLA23 23 EB125-EB250 2730 to 5276 618
    SMLA30 30 EB250-EB3000 6140 to 8475 880

     

    Thruster data

    • Standard EB Series:
    • Fluid; transformer oil BS148 typical Shell diala ‘B’
    • Approximate operating times: brake release 0.1 seconds
    • Brake set 0.25 -0.5 seconds depending on size and brake spring load.
    • Airgap dust and drip protected by neoprene qaiter
    • Terminal Box IP55 standard enclosure

    Optional features

    • High temperature viton seals.
    • Internal preset hydraulic delay valve(s)
    • Dust protecting hood
    • Internal return c-spring
    • Converter unit to operate from DC supply 220-440V
    • Explosion proof design EExd Group I and II

    Alternative Thrusters

    • Johnson/Eldro/Elhy/Elco to din 15430.
    • DC Custom
    • Thrusters Also type KT/TKF can be supplied.
    • Flame proof available
  • DC Solenoid Magnetic Drum Brakes

    01

    Type “KP” DC Solenoid Magnetic Drum Brake
    Spring applied / Electrically Released

    02

    Type “KX” DC Solenoid Magnetic Drum Brake
    Spring applied / Electrically Released

    03

    Type “KX” DC Solenoid Magnetic Drum Brake

    Spring applied / Electrically Released

    ELECTRO-MECHANICAL DC SOLENOID DRUM BRAKE TYPE ‘K’:

    Brakes For Passenger Lift Duty

    • Introducing the JOHNSON ELEVANJA type ‘K’ D.C Magnetic Drum Brake for new applications or easy retrofit. ‘K’ has been manufactured for many years and is now updated to include steel fabricated and ductile iron components.

    Standard Features:

    • Detachable manual release lever
    • Inbuilt rectifier for A.C supplies to 440V
    • Choice of enclosures dust and weatherproof IP55orlP65
    • Non-listed drum sizes
    • Adapter plate to conform to height of center/ fixing of existing brakes
    • Cast iron drums, flexible or rigid couplings to suit

    Further Possibilities:

    • Some sizes available with DOUBLE ACTION mechanism, in accordance with BS. 5655 1 (EN81) Euronorm 81
    • DM Range with flame proof magnet for hazardous locations

    KP Brake Model Data:

    BRAKE MODEL DRUM
    DIA. “D”
    ACTUATOR SIZE TORQUE
    MAX.
    WEIGHT
    mm Nm kg
    FK0402-DT0 100 DT-0 24 6.4
    BKP0603-DT1 150 DT-1 98 26
    BKP0804-DT2 200 DT-2 163 29
    BKP0804-DT3 200 DT-3 325
    36
    BKP1004-DT2 250 DT-2 197 43
    BKP1004-DT3 250 DT-3 393 50
    DKP12043-DT3 315 DT-3 488 70
    DKP12043-DT4 315 DT-4 600 88
    DKP1506-DT4 400 DT-4 850 172
    DKP1506-DT5 400 DT-5 1200 180

    KX Brake Model Data:

    BRAKE MODEL DRUM
    DIA. “D”
    ACTUATOR SIZE TORQUE
    MAX.
    WEIGHT
    in Lb.ft lb
    KXP0603-DT1 6 DT-1 50 88
    KX08035-DT2 8 DT-2 120 105
    KX08035-DT3 8 DT-3 168
    125
    KXP0904-DT2 9 DT-2 130 145
    KXP0904-DT3 9 DT-3 180 163
    KX1004-DT2 10 DT-2 145 145
    KX1004-DT3 10 DT-3 200 163
    KXP1205-DT3 12 DT-3 250 220
    KXP1205-DT4 12 DT-4 440 265
    KXP1506-DT4 15 DT-4 585 520
    KXP1506-DT5 15 DT-5 880 520

    Characteristics of DC Magnetic Drum Brakes

    All DC magnets tend to inherently show reponse due to build up and decay of the magnetic field. The actual times are dependent on brake magnet size and vary with excitation voltage, coil temperature and spring loading (torque). The magnet stroke which increases as the brake linings wear will also influence set and release times.
  • Three Phase Magnetic AC Drum Brakes

    01

    Type “DM” 3 Phase AC Solenoid Magnetic Drum Brake Spring applied / Electrically Released

    Type GDM -AM, 3 Phase Magnet Brakes:

    Brake Size:

    • This must be selected to give required braking torque and also be suitable to dissipate heat generated during braking operations without over heating.

    Brake Torque:

    • This is often negated to drive motor torque by an arbitrary service factor, typically 100% full load torque for crane travel and similar inertial loads which tend to be self-stopping or 150% for crane hoist and other overhauling loads.

    Continuous Rating:

    • Coils operate at class ‘B’ temperature while contiguously energized.

    Intermittent Rating:

    • Short time rated for up to 120 operations per hour max. 5 min. in 15 min. (33% on).

    Flameproof Magnet (Hazardous Locations):

    • Some magnet sizes available with flameproof enclosures (Type AF) to BS229 for Group I,II, & III. Allow +40% weight for AF type, please contact us

    Line Current:

    To calculate line current use the following equation:
    LC = KVA / (0.00173 x LV)
    Where LV = line voltage
    (see coil table)

    DM METRIC Brake Model Data:

    BRAKE MODEL DRUM
    DIA. “D”
    MAGNET SIZE TORQUE
    Cont.
    TORQUE
    Int.
    WEIGHT
    mm Nm Nm kg
    DM160-AM01-9 160 AM01-9 44 59 32
    DM200-AM2-12
    DM200-AM3-12
    200 AM2-12
    AM3-12
    88
    147
    147
    255
    34
    47
    DM250-AM2-12
    DM250-AM3-12
    250 AM2-12
    AM3-12
    108
    186
    182
    323
    41
    44
    DM315-AM3-12
    DM315-AM4-12
    DM315-AM5-12
    315 AM3-12
    AM4-18
    AM5-18
    226
    432
    608
    402
    677
    90
    110
    119
    DM400-AM4-18
    DM400-AM5-18
    400 AM4-18
    AM5-18
    520
    795
    863
    1285
    219
    220
    DM500-AM4-18
    DM500-AM5-18
    DM500-AM7-22
    500 AM4-18
    AM5-18
    AM7-22
    579
    863
    2160
    1069
    1609
    3630
    245
    266
    416

    DM Imperial Brake Model Data:

     

    BRAKE MODEL DRUM
    DIA. “D”
    MAGNET SIZE TORQUE
    Cont.
    TORQUE
    Int.
    WEIGHT
    in Lb.ft. Lb.ft. lb
    DM6-AM01-9 6 AM01-9 33 43 71
    DM8-AM2-12
    DM8-AM3-12
    8 AM2-12
    AM3-12
    65
    108
    108
    188
    93
    101
    DM10-AM2-12
    DM10-AM3-12
    10 AM2-12
    AM3-12
    80
    137
    134
    238
    112
    123
    DM12-AM3-12
    DM12-AM4-12
    DM12-AM5-12
    12 AM3-12
    AM4-18
    AM5-18
    166
    318
    448
    296
    500
    198
    243
    262
    DM16-AM4-18
    DM16-AM5-18
    16 AM4-18
    AM5-18
    383
    586
    637
    948
    483
    485
    DM20-AM4-18
    DM20-AM5-18
    DM20-AM7-22
    20 AM4-18
    AM5-18
    AM7-22
    427
    637
    1591
    789
    1187
    2679
    540
    586
    917

    Coil Table
    Table of Coil Ratings for 3 Phase Magnet Drum Brakes
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      Tel: (604) 940 4555
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      Tel: (416) 213 9991
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      Tel: (01278) 456 411
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  • Specialists in industrial braking for more than 100 years.

    Contact us for help finding the best and most cost effect solution.