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

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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
[/vc_nested_tab][vc_nested_tab title=”Brake Model Data” tab_id=”1397182430-2-2″]

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.
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Thruster Drum Brakes

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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
[/vc_nested_tab][vc_nested_tab title=”Brake Model Data” tab_id=”1398163942-2-32″]

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
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DC Solenoid Magnetic Drum Brakes

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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
[/vc_nested_tab][vc_nested_tab title=”Brake Model Data” tab_id=”1398167927-2-32″]

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.
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Three Phase Magnetic AC Drum Brakes

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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)
[/vc_nested_tab][vc_nested_tab title=”Brake Model Data” tab_id=”1398323285-2-8″]

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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  • Specialists in industrial braking for more than 100 years.

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