INTORQ BFK458 User manual

Spring-applied brake
INTORQ BFK458
The versatile modular system
2–600 Nm
setting the standard

2
INTORQ BFK458 - The modular system
Our modular system forms the basis for a product range that
offers versions tailored for almost any task. The BFK458
spring-applied brake, as a standard product, can be used
anywhere, but its modular structure also meets the
requirements of specific industries. Its strength lies in its
versatility.
Electromagnetically released spring-applied brakes are used
wherever masses in motion have to be decelerated as
quickly as possible or where masses must be held in a
defined position. The braking force is applied by
compression springs. Thus the braking torque generated by
friction locking remains available in the deenergised status –
even in the event of mains failure. The brake is released
electromagnetically.
The INTORQ BFK458 range replaces the 14.448/14.449
and 14.450 models of spring-applied brake. The main
components of the new modular system are the two basic
modules E (adjustable braking torque) and N (braking torque
not adjustable). The greatest degree of flexibility is achieved
for a broad range of applications by the combination of the
basic module with specific modules. This catalogue is
intended to help you to select and to order the spring-
applied brake you require quickly and easily.
The modular system for all applications
|Brake motors
|Cranes
|Storage technology
|Industrial trucks
|Wood working machines
|Stage machinery
|Vehicles for the disabled
|Automation technology
|Regulated drives
|Gate drives
|Escalators

3
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
Contents
Product key 4
List of abbreviations 5
Product information 6
Principle of operation 7
Example applications 8
Technical data
Braking torques 9
E/N + basic module 10
Flange + manual release
Brake module N + 11
centring flange
Basic module N + 12
Connection flange +
basic module N
Rated data 13
Operating times 14
Service life and wear 15
Accessories
Manual release/flange/ 16
friction plate
Centring flange/ 17
connection flange/Seal
Brake cover 18
Microswitch 19
Terminal box 20
Type code 21
Bridge rectifier and
half-wave rectifier BEG
Spark suppressor 21
INTORQ 14.198.00.O ò
Bridge rectifiers and 22
half-wave rectifiers BEG
Fastening options 25
Connection diagrams 26
Mains voltage selection table 27
Dimensioning
Basic information 28
Calculation example 29
Order form 30
Sales and service 32
around the world

4
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
INTORQ BFK458-òòò product key
Friction plate
Flange
Connection
flange
(double
brake)
Centring flange
(tacho flange)
Seal
Hub
Rotor
Complete stator
brake module N
Plug
Shaft
sealing ring
Complete stator
brake module E
Manual release
Sizes
06, 08, 10, 12, 14, 16, 18, 20, 25
Stator design
E – Adjustable (braking torque can be reduced using
torque adjustment ring)
N – Non-adjustable
Not coded:
Supply voltage, hub bore,
Options
BFK 4 5 8 - òò ò
Product group: Brakes
Product family: Spring-applied brakes
Type
Sizes
Design

5
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
List of abbreviations
P[kW] Drive power
MK[Nm] Rated torque of brake
ML[Nm] Load torque
Merf [Nm] Required braking torque
Ma[Nm] Deceleration torque
∆n0[rpm] Initial relative speed of the brake
JL[kgm2] Moment of inertia of all
driven parts, referred to the shaft
to be braked
t1[s] Engagement time, t1= t11 + t12
t2[s] Disengagement time (time from the
beginning of the torque drop until
0.1 MKis reached)
t3[s] Slipping time
(time during which a relative motion
occurs between the input and output,
with brake applied)
t11 [s] Delay time
(time from disconnecting the voltage until
the torque begins to rise)
t12 [s] Rise time of braking torque
KSafety factor
Q[J] Calculated friction energy per switching
cycle
Qzul [J] Maximum permissible friction energy per
switching cycle
Sh[h-1]Operating frequency, i.e. the number of
periodical brake operations
Slü Rated air gap

6
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
Product information
INTORQ BFK458 spring-applied brake
A powerful and complete range
|9 sizes
|Standard voltages 24 V, 96 V, 103 V, 170 V, 180 V, 190 V,
205 V
|Graduated torque range from 2 – 600 Nm
|Short delivery times for the complete range, thanks to
optimised logistics
|IP54 enclosure, depending on the particular operating
conditions
|CSA and UL over all sizes
|ATEX:
The product is suitable for use in potentially explosive
atmospheres in zone II for stationary operation (holding or
parking brake), explosion group II and temperature class
T4.
Versatile
|Modular structure for virtually all applications
|Interchangeable with brake models 14.448 and 14.450
Torque transmission
|Designed for dry running
Ready for operation immediately
|Preset air gap, quick and easy mounting
|Special machining of the friction surfaces ensures that the
rated torques are achieved after very few switching
operations
|No fixed bearing is required on the brake
Durable
|The insulation system to temperature class F (155°C)
ensures that the winding has a long service life
|These brakes are designed for 100% duty time (current
applied to the brake)
Low maintenance
|Long rotor/hub connection with low rate of wear and a
tried-and-tested involute gear
|Asbestos-free fiction linings with low rate of wear
|Air gap must be checked as a function of the friction
energy used
Reliable
|The quality assurance system is certified to ISO 9001 and
ISO 14001 and provides the basis for consistently high-
quality products
|Production and testing to VDE 0580
Options
|Manual release for all sizes, both directions can be used
for release and mounting (one exception is the tacho
brake)
|Noise-reduced design
|Various types of corrosion protection and enclosures
|Microswitches used to monitor air gap and
wear (size 12 and above)
|Monitoring of manual release function (page 19)
|Non-standard voltages and bores on request

7
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
INTORQ BFK458 spring-applied brake
6
1
5
4
3
9
Principle of operation
INTORQ BFK458 spring-applied brakes are single-disc
brakes with two friction surfaces. When a de-energised,
several compression springs are used to generate the
braking torque through friction locking. The brake is
released electromagnetically. During the braking procedure,
the rotor (3), which can be shifted axially on the hub (4), is
pressed against the counter friction face (6) via the
armature plate (1), by means of the compression springs (2).
When the brakes are applied, an air gap slü is present
between the armature plate and the stator (7). The stator's
coil is energised with DC voltage in order to release the
brake.
The resulting magnetic flux works against the spring force to
draw the armature plate to the stator. This releases the rotor
from the spring force and allows it to rotate freely. Brake
module E supports the use of the torque adjustment ring (8)
to reduce the braking torque.
Brake module E + rotor + hub + flange
7
2
8
Brake module N + rotor + hub
1
3
4
2
9
7
1=Armature plate
2=Compression springs
3=Rotor
4=Hub
5=Shaft
6=Flange
7=Stator
8=Torque adjustment ring
9=Sleeve bolts
slü = Air gap
slü
slü

8
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
Example applications
INTORQ BFK458 spring-applied brake
Rotate, lift, move – whenever cranes are in motion,
INTORQ spring-applied brakes are never far away
Corrosion resistant designs and various sealing variants for
spring-applied brakes in cranes.
INTORQ opens and closes gates and doors
Spring-applied brakes with manual release monitoring via
microswitches and electromagnetic clutches ensure safe
operation of door drives and automatic doors.
Curtain up for INTORQ brakes
A silenced version of the double spring-applied brake is used
in the theatre as a redundant braking system.

9
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
Size 06 08 10 12 14 16 18 20 25
80 E
1.5 E 3.5 N/E 25 N/E 35 N/E 65 N/E 115 N/E 175 N/E
2 N/E 4 E 7 N/E 14 N/E 35 N 45 N/E 80 N/E 145 N/E 220 N
2.5 N/E 5 N/E 9 N/E 18 N/E 40 N/E 55 N/E 100 N/E 170 N/E 265 N/E
3 N/E 6 N/E 11 N/E 23 N/E 45 N/E 60 N/E 115 N/E 200 N/E 300 N/E
3.5 N/E 7 N/E 14 N/E 27 N/E 55 N/E 70 N/E 130 N/E 230 N/E 350 N/E
4 N/E 8 N/E 16 N/E 32 N/E 60 N/E 80 N/E 150 N/E 260 N/E 400 N/E
4.5 N/E 9 N/E 18 N/E 36 N/E 65 N/E 90 N/E 165 N/E 290 N/E 445 N/E
5 E 10 E 20 E 40 E 75 N/E 100 N/E 185 N/E 315 N/E 490 N/E
5.5 E 11 E 23 N/E 46 N/E 80 N/E 105 N/E 200 N/E 345 N/E 530 N/E
6 N/E 12 N/E 125 N/E 235 N/E 400 N/E 600 N/E
Size 06 08 10 12 14 16 18 20 25
Torque reduction
per detent position [Nm] 0.2 0.35 0.8 1.3 1.7 1.6 3.6 5.6 6.2
Technical data
Braking torques
Holding brake with emergency stop
(slümax approximately 1.5 x slü)
Service brake
(slümax approximately 2.5 x slü)
Standard braking torque
Depending on the individual application, the graduated
torques listed in the tables below are available. A pole shim
(brass film) must be placed between the stator and the
Brake module E, reduced braking torque
The braking torque on brake module E can be reduced
using the torque adjustment ring located in the stator.
The torque adjustment ring can be unscrewed to a
maximum dimension of h1max (see table on page 10).
It should be noted that the engagement and disengagement
times change in accordance with the braking torque. Torque
reduction is independent of the rated torque used.
| N ... Braking torque for design N (without torque adjustment ring)
| E ... Braking torque for design E (with torque adjustment ring)
Characteristic torques [Nm],
related to the relative speed
∆n = 100 rpm
armature plate if you want to achieve short operating times
with low torques.

10
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
Size h h1h1h2h3h4h5h57) h6h7h8h9ll
15) slü
ab
6)
min. max. standard max.
06 36.3 39.3 43.25 1 6 15.8 107 – 54.5 23 32.8 56.3 18 400 0.2 25° 12°
08 42.8 46.8 50.8 1.5 7 16.3 116 – 63 23 41.3 65 20 400 0.2 25° 10°
10 48.4 52.4 55.9 2 9 27.4 132 – 73.8 23 42.4 77.8 20 400 0.2 25° 9°
12 54.9 58.9 67.53 2 9 29.4 161 – 85 23 47.4 88.5 25 400 0.3 25° 10°
14 66.3 71.3 77.3 2 11 33 195 – 98 32 50 101.5 30 400 0.3 25° 9°
16 72.5 77.5 85.5 2.25 11 37.5 240 – 113 32 53.5 116 30 600 0.3 25° 10°
18 83.1 89.1 97.09 2.75 11 41.1 279 394 124 32 59.1 128.5 35 600 0.4 25° 9°
20 97.6 104.6 114.6 3.5 11 47.6 319 416 146 32 68.6 149.5 40 600 0.4 25° 10°
25 106.7 115.7 127.7 4.5 12.5 57.7 445 501 170 32 88.7 175.5 50 600 0.5 25° 10°
Size b dJ7 1) dH7 2) d1d2d3H7 d5d6j7 d7d8d9H8 d10 d11 d12 d13 d143) d153) d16 di da
spec. standard
06 88 10 10/11/12/14/15 3xM4 72 25 91 87 87 52 24 31 8 13 9.6 4xM4 37.7 3x4.5 40 60
08 106.5 10 11/12/14/15/20 3xM5 90 32 109 105 105 60 26 41 8 13 9.6 4xM5 49 3x5.5 47 77
10 132 10 11/12/14/15/20 3xM6 112 42 134 130 130 68 35 45 10 13 12 4xM5 54 3x6.6 66 95
12 152 14 20/25 3xM6 132 50 155 150 150 82 40 52 10 13 12 4xM5 64 3x6.6 70 115
14 169 14 20/25/30 3xM8 145 60 169 165 165 92 52 55 12 24 14 4xM6 75 3x9 80 124
16 194.5 15 25/30/35/38* 3xM8 170 68 195 190 190 102 52 70 12 24 14 4xM6 85 3x9 104 149
18 222 20 30/35/40/45 6xM8 196 75 222 217 217 116 62 77 14 24 15.5 4xM8 95 4x94) 129 174
20 258 25 35/40/45/50 6xM10 230 85 259 254 254 135 72 90 14 24 16.5 4xM10 110 4x114) 148 206
25 302 30 40/45/50/55/60/65/70* 6xM10 278 115 307 302 302 165 85 120 16 24 18.4 4xM10 140 6x11 199 254
slü
Thickness of friction plate: 1.5 mm
(sizes 06-16)
|1) pre-drilled without keyway
|2) Standard keyway in accordance with DIN 6885/1 P9, selection of the shaft diameter
depending on the type of loading (see Operating Instructions)
|* Ø 38 and Ø 70 mm, keyway in accordance with DIN 6885/3 P9
|3) Bores are made on customer request for sizes 06–12
|4) The thread in the mounting surface is offset by 30° in relation to the centre axle of the
manual release lever
|Dimensions in mm
|5) Length of the connecting cable
|6) Manual release angle tolerance +3°
|7) Recommended lever length for 1.5 MK
|Recommended ISO shaft tolerances: up to Ø 50 mm = k6
over Ø 50 mm = m6
Technical data
Brake module E/N + flange + manual release

11
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
Size h h1h2dH7 d11) d2d3d45) d5H7 d6h7 d7H7 d8di da l l12) l2slü
max.
06 42.3 36.3 7 15 3xM4 72 37.7 4xM4 25 95 40 98 40 60 18 400 2 0.2
08 49.8 42.8 8.5 20 3xM5 90 49 4xM5 32 115 50 116 47 77 20 400 2 0.2
10 57.4 48.4 11 20 3xM6 112 54 4xM5 42 140 60 141 66 95 20 400 2 0.2
12 63.9 54.9 11 25 3xM6 132 64 4xM5 50 162 60 165 70 115 25 400 2 0.3
14 76.5 65.5 13 30 3xM8 145 75 4xM6 60 177 80 181 80 124 30 400 2 0.3
16 83.5 72.5 13.25 384) 3xM8 170 85 4xM6 68 204 85 206 104 149 30 600 2 0.3
18 94.1 83.1 13.75 45 6xM8 196 95 4xM8 75 233 90 237 129 174 35 600 2 0.4
20 108.6 97.6 14.5 50 6xM10 230 110 4xM10 85 271 90 274 148 206 40 600 2 0.4
25 118.2 106.7 17 704) 6xM10 278 140 4xM10 115 322 120 324 199 254 50 600 2 0.5
|1) Use DIN 6912 fixing screws
|2) Cable length
|3) Manual release can be mounted as an option, as shown on right of page 10
|4) Keyway in accordance with DIN 6885/3-P9
|5) Bores are made on customer request for sizes 06–12
|Dimensions in mm
Technical data
Brake module N + centring flange
Brake suitable for mounting a speed or angle
sensor

12
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
Size dH7 d1d2d5H7 d6j7 di da H h h1h2h3ll
11) l2slü
max.
06 15 3xM4 72 25 87 40 60 84.6 36.3 12 1 48.3 18 400 8.7 0.2
08 20 3xM5 90 32 105 47 77 97.6 42.8 12 1.5 54.8 20 400 9.8 0.2
10 20 3xM6 112 42 130 66 95 109.8 48.4 13 2 61.4 20 400 12.7 0.2
12 25 3xM6 132 50 150 70 115 125.8 54.9 16 2 70.9 25 400 13.1 0.3
14 30 3xM8 145 60 165 80 124 148 65.5 17 2 82.5 30 400 13.1 0.3
16 382) 3xM8 170 68 190 104 149 165 72.5 20 2.25 92.5 30 600 16.4 0.3
18 45 6xM8 196 75 217 129 174 186.2 83.1 20 2.75 103.1 35 600 17.5 0.4
20 50 6xM10 230 85 254 148 206 215.2 97.6 20 3.5 117.6 40 600 17.8 0.4
25 70 6xM10 278 115 302 199 254 238.4 106.7 25 4.5 130.7 50 600 21.5 0.5
|1) Cable length
|2) Keyway in accordance with DIN 6885/3-P9
|Manual release as an option
|Dimensions in mm
Technical data
Brake module N + connection flange + brake module N
Noise-reduced designs
The noise reduction required in many applications can be
achieved in two ways:
1. Impact-noise-reduced armature plate
The brake's operating noise can be minimised using special
damping elements, which are installed between the pole
face and the armature plate as shock absorbers.
2. Noise-reduced aluminium rotor
Rattling noises, which can occur in the rotor/hub
connection, for example, during frequency inverter
operation, or as a result of load alternation, or non-constant
speeds, are reduced by using a rotor with a plastic sleeve.
Double brake (double braking torque) as redundant
braking system, suitable for use in stage machinery and
many other areas of application

13
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
Size Average braking torque at ∆n0 [rpm] max. speed
braking torque on braking [%] ∆n0max
off ∆n0to a standstill
[%] 1500 3000 max. [rpm]
06 100 87 80 65 12400
08 100 85 78 66 10100
10 100 83 76 66 8300
12 100 81 74 66 6700
14 100 80 73 67 6000
16 100 79 72 66 5300
18 100 77 70 66 4400
20 100 75 68 66 3700
25 100 73 66 66 3000
Size P1) slü max slü max max. min.2) Jplastic rotor Jaluminium rotor Mass of
[20 °C] service brake holding brake adjustment rotor thickness stator
[W] [mm] [mm] [mm] [mm] [kgcm2][kgcm2]assy [kg]
06 20 0.5 0.3 1.5 4.5 0.11 0.15 0.75
08 25 0.5 0.3 1.5 5.5 0.34 0.61 1.2
10 30 0.5 0.3 1.5 7.5 – 2.0 2.1
12 40 0.75 0.45 2.0 8.0 – 4.5 3.5
14 50 0.75 0.45 2.5 7.5 – 6.3 5.2
16 55 0.75 0.45 3.5 8.0 – 15 7.9
18 85 1.0 0.6 3.0 10.0 – 29 12
20 100 1.0 0.6 4.0 12.0 – 73 19.3
25 110 1.25 0.75 4.5 15.5 – 200 29.1
Braking torques, depending on speed and permissible
limit speeds
Technical data
Rated data
| 1) Coil power at 20°C in W, possible deviation up to +10%, depending on supply voltage
selected
|2) The friction lining is dimensioned so that the brake can be readjusted at least five times.
As speed increases, so does wear.

14
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
Size Braking torque Maximum permissible Transitional- Switching times [ms] 2)
rating at switching energy at switching at slüRated
∆n = 100 rpm single switching operation frequency
MK1) QEShü Connection on the DC side Disconnect
[Nm] [J] [h-1]t
11 t12 t1t2
06 43000 79 15 13 28 45
08 87500 50 15 16 31 57
10 16 12000 40 28 19 47 76
12 32 24000 30 28 25 53 115
14 60 30000 28 17 25 42 210
16 80 36000 27 27 30 57 220
18 150 60000 20 33 45 78 270
20 260 80000 19 65 100 165 340
25 400 120000 15 110 120 230 390
The listed operating times apply to DC switching with rated
air gap slü and a warm coil. The times are mean values which
may vary depending on the method of rectification
and the air gap slü. The engagement time t1is approximately
10 times higher for AC switching than for DC switching.
|1) Minimum braking torque for run-in friction pairs
|2) Operating times valid for 205 V DC coils
AC switching
DC switching
t11 = Delay
time
t12 = Rise time of
braking torque
t1= Engagement time
t2= Disengagement time
t3= Slipping time
Torque time characteristic, dependent on
excitation voltage
Characteristic torque
Excitation
Time
Time
Technical data
Operating times

15
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
Technical data
Permissible friction energy Qzul depending on
operating frequency Sh
Service life and wear
The brake has to be adjusted when slümax is reached. The
friction energy to be withstood up to this point is dependent
on a number of factors: in particular, the inertias to be
braked, the braking speed, the operating frequency and the
resulting temperature on the friction surfaces. For this
reason, no universal value for all operating conditions can
be given in respect of the amount of friction energy that
can be handled before adjustment is required.
In addition, increased wear should be expected with
vertical mounting.
The BFK458 can be adjusted when the maximum
permissible working air gap is reached (slümax). The
dimensioning of the friction lining allows adjustment to be
carried out at least five times.
Where the amount of friction energy per switching
operation is low, the brake's mechanical components can
impose limitations in terms of service life. In particular, the
rotor/hub connection, springs, armature plate and sleeves
are subject to operational wear. The expected service life of
the standard design is around 1 million load alternations.
Solutions that are optimised in terms of service life are
available in cases where a longer service life is required
(consult the manufacturer).
Maintenance
Brakes are components which are subject to a great deal of
wear. When installing the brake, it must be ensured that it
can be easily accessed for inspection and maintenance
purposes. Intervals between inspections should be set in
accordance with the expected service life and load. For
more information, please see the Operating Instructions.
25
20
18
16 14 12
10
08
06
Sh[h-1]
105
104
103
102
Qperm in [J]
Sizes
110
102103104
10

16
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
Size slü + 0.1 s +0.1
- 0.05
[mm] [mm]
06
08 0.2 1
10
12
14 0.3 1.5
16
18 0.4 2
20
25 0.5 2.5
slü
Accessories
Manual release
The manual release is used to release the brake by hand and
can be retrofitted. The manual release springs back to its
base position (0 setting) automatically after operation. The
release screws are carried in ball joints and are only
tensioned. The air gap "s" is the distance between the
armature plate (1) and the washer (15). The dimension "s"
must be maintained when installing the manual release.
Flange
A flange can be used if no suitable counter friction face is
available. The flange can also be fitted with the seal.
Friction plate
A friction plate may be supplied for sizes 06 up to and
including 16. This should be used if the counter face is
smooth and machined, but is not suitable as a friction
surface. Combination with a cover ring is provided.
Flange Friction plate
(sizes 06 – 16)
Manual release

17
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
Centring flange (tacho brake)
Brake module N combined with a centring flange is suitable
for mounting a tachogenerator.
Connection flange (double brake)
The connection flange can be used to adapt a second brake
module to brake module N; the resulting double brake is
suitable for use in stage machinery or other applications
with increased safety requirements.
Seal
To a large extent, the seal prevents the exit or ingress of
dust, humidity, dirt, etc., out of or into the braking area. The
seal is inserted into the groove on the stator. If no suitable
groove is available on the counter friction face, we
recommend the use of a flange.
SealConnection flangeCentring flange
Accessories

18
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
Size d1d2d3H8 d4d5hh
1h2h31)
06 135 120 98 4x5.5 M16x1.5 55 28 16.5 3
08 155 142 118 4x5.5 M20x1.5 61 34 20 3
10 185 166 143 4x5.5 M20x1.5 72 39 21 3
12 205 192 163 4x6.6 M20x1.5 82 42 23 3
14 225 212 183 4x6.6 M20x1.5 92 51 24 3
16 250 236 208 4x6.6 M20x1.5 98 52 25 3
18 285 268 238 4x6.6 M20x1.5 115 60 29 3
20 330 314 283 4x9 M20x1.5 131 69 35 3
25 390 368 328 4x9 M20x1.5 142 78 40 3
Brake module E, N + cover = encapsulated design
A cover can be mounted onto brake module E and brake
module N as an option, to protect the brake from water and
dust (enclosure to IP 65). This design is not available in
conjunction with manual release.
|1) Recommended recess length on motor endshield
Accessories
Brake cover

19
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
Size 12 14 16 18 20 25
Dimension x 13 11.5 11 7 * *
Overall radius r 80.5 88.5 99 112.5 * 155
|* no projection
|Dimensions in mm
The brake can be fitted with a microswitch for the purpose
of monitoring the release or wear. The microswitch can be
built into the circuit as an NC contact or an NO contact.
Dimensions
Mounting the microswitch onto brake module E
Accessories
Microswitch
Microswitch for manual release monitoring
Gate drives, for instance, are provided with brakes with
manual release, and a microswitch for monitoring the
manual release. In this case, the manual release must make
it possible to move the gate to the desired position in
manual operation, e.g. using a crank. This manual operation
has to be detected via a microswitch, whose switching
signal must be combined with the motor control, so that the
motor can be prevented from starting (thus also preventing
any possible injury to the operator). The microswitch for
manual release monitoring is a built-on option.
The fixing bracket is screwed onto the magnet housing or
stator via the bores on the rear face. The fixing bracket
enables a microswitch to be fastened to it. The two
directions of release, towards and away from the motor, can
be implemented by using different fixing brackets and
microswitch settings.

20
INTORQ IINTORQ BFK458 spring-applied brake Ien 3/2007
Size 12 14 16 18 20 25
b-5 5.5 12.5 23 37.5 45.5
h122 130 142 155 174 198
r126 134 146 158.5 177 201
The connecting cables can easily be integrated into higher-
level controls via the terminal box (brake sizes 12-25) in
order to support different wiring options (three
inputs/outputs). 2/4-pole terminal strips, half-wave and
bridge rectifiers and a microswitch connection can be
integrated into the terminal box.
The terminal box is shown
offset by 30°.
|Dimensions in mm
The terminal box is mounted onto the spring-applied brake
using a fixing bracket and screws, as shown in the
illustration. You can select the mounting angle according
to your requirements by using the assembly kit.
Accessories
Terminal box