INTORQ BFK464-R Series Quick guide

INTORQ BFK464-□□R
Spring-applied brake with electromagnetic release
Translation of the Original Operating Instructions
www.intorq.com

Document history
Material number Version Description
33006446 1.0 09/2017 SC First edition
33006446 2.0 05/2018 SC Update of HR and tightening torques
33006446 3.0 10/2019 SC Migration to ST4
Legal regulations
Liability
¾
The information, data and notes in these Operating Instructions are up to date at the time of printing.
Claims referring to drive systems which have already been supplied cannot be derived from this in-
formation, illustrations and descriptions.
¾
We do not accept any liability for damage and operating interference caused by:
– inappropriate use
– unauthorised modifications to the product
– improper work on or with the drive system
– operating errors
– disregarding the documentation
Warranty
Notice
The warranty conditions can be found in the terms of sale and delivery from INTORQ
GmbH & Co. KG.
¾
Warranty claims must be made to INTORQ immediately after the defects or faults are detected.
¾
The warranty is void in all cases when liability claims cannot be made.
INTORQ | BA 14.0214 | 10/2019 2

Product key
Product group: Brakes
Product family: Spring-applied brake
Type: 464
Size: 17, 18, 19, 20, 22, 25, 28
INTORQ B FK
Design/type: R
Not coded: Connection voltage, hub bore hole, options
Checking the delivery
After receipt of the delivery, check immediately whether the items delivered match the accompanying pa-
pers.
INTORQ does not accept any liability for deficiencies claimed subsequently.
¾
Claim visible transport damage immediately to the deliverer.
¾
Claim visible deficiencies or incomplete deliveries immediately to INTORQ GmbH & Co. KG.
NOTICE
Labelling of drive systems and individual components
¾
Drive systems and components are unambiguously designated by the labelling on their
name plates.
¾
The spring-applied INTORQ brake is also delivered in single modules which can then be
put together by the customer according to their requirements. The specifications – particu-
larly the packaging label, name plate and type code – apply to a complete stator.
¾
The labelling is not included when components are delivered individually.
INTORQ | BA 14.0214 | 10/2019 3

Contents
Legal regulations ....................................................................................................................................................... 2
Warranty...................................................................................................................................................................... 2
Product key................................................................................................................................................................. 3
Checking the delivery................................................................................................................................................ 3
1 General information................................................................................................................................................... 6
1.1 Using these Operating Instructions ...................................................................................................................... 6
1.2 Conventions in use............................................................................................................................................... 6
1.3 Safety instructions and notices ............................................................................................................................ 6
1.4 Terminology used................................................................................................................................................. 7
1.5 Abbreviations used............................................................................................................................................... 8
2 Safety instructions................................................................................................................................................... 10
2.1 General safety instructions................................................................................................................................. 10
2.2 Disposal ............................................................................................................................................................. 10
3 Product description ................................................................................................................................................. 11
3.1 Proper and intended usage................................................................................................................................ 11
3.1.1 Standard applications ............................................................................................................................ 11
3.2 Layout ................................................................................................................................................................ 11
3.3 Function ............................................................................................................................................................. 13
3.4 Braking and release ........................................................................................................................................... 13
3.5 Project planning notes........................................................................................................................................ 13
3.6 Optional configuration ........................................................................................................................................ 14
3.6.1 Hand-release (optional) ......................................................................................................................... 14
3.6.2 Optional micro-switch ............................................................................................................................ 14
3.6.3 Optional encapsulated design ............................................................................................................... 14
4 Technical specifications.......................................................................................................................................... 15
4.1 Possible applications of the INTORQ spring-applied brake ............................................................................... 15
4.2 Rated data.......................................................................................................................................................... 15
4.3 Switching times .................................................................................................................................................. 18
4.4 Friction work / operating frequency .................................................................................................................... 20
4.5 Electromagnetic compatibility............................................................................................................................. 21
4.6 Emissions........................................................................................................................................................... 21
4.7 Labels on product............................................................................................................................................... 22
5 Mechanical installation............................................................................................................................................ 24
INTORQ | BA 14.0214 | 10/2019 4

5.1 Design of end shield and shaft........................................................................................................................... 24
5.2 Tools .................................................................................................................................................................. 25
5.3 Preparing the installation.................................................................................................................................... 26
5.4 Installing the hub onto the shaft ......................................................................................................................... 27
5.5 Mounting the flange (optional)............................................................................................................................ 28
5.6 Brake mounting .................................................................................................................................................. 29
5.7 Cover ring assembly .......................................................................................................................................... 33
5.8 Installing the hand-release (retrofitting).............................................................................................................. 33
6 Electrical installation ............................................................................................................................................... 37
6.1 Electrical connection .......................................................................................................................................... 38
6.2 Technical specifications for the micro-switch ..................................................................................................... 39
6.3 Rectifier .............................................................................................................................................................. 40
6.3.1 Bridge-half-wave rectifier for brakes with holding voltage reduction ..................................................... 40
6.3.2 Bridge rectifier for brakes without holding voltage reduction ................................................................. 40
6.3.3 Assignment: Rectifier - Brake size......................................................................................................... 40
6.3.4 Technical specifications......................................................................................................................... 41
6.3.5 Permissible current load at ambient temperature.................................................................................. 42
7 Commissioning and operation ............................................................................................................................... 43
7.1 Function checks before initial commissioning .................................................................................................... 43
7.1.1 Brake with micro-switch......................................................................................................................... 43
7.1.2 Checking the hand-release.................................................................................................................... 44
7.2 Commissioning................................................................................................................................................... 45
7.3 During operation................................................................................................................................................. 46
8 Maintenance and repair........................................................................................................................................... 47
8.1 Wear of spring-applied brakes ........................................................................................................................... 47
8.2 Inspections ......................................................................................................................................................... 48
8.2.1 Maintenance intervals............................................................................................................................ 48
8.3 Maintenance....................................................................................................................................................... 48
8.3.1 Checking the components ..................................................................................................................... 49
8.3.2 Check the rotor thickness ...................................................................................................................... 49
8.3.3 Checking the air gap.............................................................................................................................. 50
8.3.4 Release / voltage................................................................................................................................... 50
8.3.5 Replace rotor ......................................................................................................................................... 51
8.4 Spare parts list ................................................................................................................................................... 52
9 Troubleshooting and fault elimination................................................................................................................... 53
INTORQ | BA 14.0214 | 10/2019 5

General information
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1 General information
1.1 Using these Operating Instructions
¾
These Operating Instructions will help you to work safely with the spring-applied brake with electro-
magnetic release. They contain safety instructions that must be followed.
¾
All persons working on or with electromagnetically released spring-applied brakes must have the Oper-
ating Instructions available and observe the information and notes relevant for them.
¾
The Operating Instructions must always be in a complete and perfectly readable condition.
1.2 Conventions in use
This document uses the following styles to distinguish between different types of information:
Spelling of numbers Decimal separator Point The decimal point is always used. For ex-
ample: 1234.56
Page reference Underscore, orange _____
Reference to another page with additional
information
For example: Using these Operating In-
structions,Page6
Symbols
Wildcard □
Wildcard (placeholder) for options or selec-
tion details
For example: BFK464-R-□□ = BFK464-
R-10
Notice Important notice about ensuring smooth op-
erations or other key information.
1.3 Safety instructions and notices
The following icons and signal words are used in this document to indicate dangers and important safety
information:

General information
INTORQ | BA 14.0214 | 10/2019 7
Structure of safety notices:
CAUTION
Icon
Indicates the type of danger
Signal word
Characterizes the type and severity of danger.
Notice text
Describes the danger.
Possible causes
List of possible consequences if the safety notices are disregarded.
Protective measures
List of protective measures required to avoid the danger.
Danger level
DANGER
DANGER indicates a hazardous situation which, if not avoided, will result in death or seri-
ous injury.
WARNING
WARNING indicates a potentially hazardous situation which, if not avoided, could result in
death or serious injury.
CAUTION
CAUTION indicates a hazardous situation which, if not avoided, could result in minor or
moderate injury.
NOTICE
Notice about a harmful situation with possible consequences: the product itself or sur-
rounding objects could be damaged.
1.4 Terminology used
Term In the following text used for
Spring-applied brake Spring-applied brake with electromagnetic release
Drive system Drive systems with spring-applied brakes and other drive com-
ponents

General information
INTORQ | BA 14.0214 | 10/2019 8
1.5 Abbreviations used
Letter symbol Unit Designation
FRN Rated frictional force
I A Current
IHA Holding current, at 20 °C and holding voltage
ILA Release current, at 20 °C and release voltage
INA Rated current, at 20 °C and rated voltage
MANm Tightening torque of fastening screws
Mdyn Nm Braking torque at a constant speed of rotation
MKNm Rated torque of the brake, rated value at a relative speed of rotation of 100
rpm
nmax rpm Maximum occurring speed of rotation during the slipping time t3
PHW Coil power during holding, after voltage change-over and 20 °C
PLW Coil power during release, before voltage change-over and 20 °C
PNW Rated coil power, at rated voltage and 20 °C
Q J Quantity of heat/energy
QEJMax. permissible friction energy for one-time switching, thermal parameter of
the brake
QRJ Braking energy, friction energy
QSmax JMaximally permissible friction energy for cyclic switching, depending on the
operating frequency
RmN/mm2Tensile strength
RNOhms Rated coil resistance at 20 °C
Rzμm Averaged surface roughness
Sh1/h Operating frequency: the number of switching operations evenly spread over
the time unit
Shue 1/h Transition operating frequency, thermal parameter of the brake
Shmax 1/h Maximum permissible operating frequency, depending on the friction energy
per switching operation
sLmm Air gap: the lift of the armature plate while the brake is switched
sLN mm Rated air gap
sLmin mm Minimum air gap
sLmax mm Maximum air gap
sHL mm Air gap for hand-release
t1ms Engagement time, sum of the delay time and braking torque: rise time
t1 = t11 + t12
t2ms Disengagement time, time from switching the stator until reaching 0.1 Mdyn

General information
INTORQ | BA 14.0214 | 10/2019 9
Letter symbol Unit Designation
t3ms Slipping time, operation time of the brake (according to t11) until standstill
t11 ms Delay during engagement (time from switching off the supply voltage to the
beginning of the torque rise)
t12 ms Rise time of the braking torque, time from the start of torque rise until reach-
ing the braking torque
tue s Over-excitation period
U V Voltage
UHV DC Holding voltage, after voltage change-over
ULV DC Release voltage, before voltage change-over
UNV DC Rated coil voltage; in the case of brakes requiring a voltage change-over,
UN equals UL

Safety instructions
INTORQ | BA 14.0214 | 10/2019 10
2 Safety instructions
2.1 General safety instructions
¾
Never operate INTORQ components when you notice they are damaged.
¾
Never make any technical changes to INTORQ components.
¾
Never operate INTORQ components when they are incompletely mounted or incompletely connected.
¾
Never operate INTORQ components without their required covers.
¾
Only use accessories that have been approved by INTORQ.
¾
Only use original spare parts from the manufacturer.
Keep the following in mind during the initial commissioning and during operation:
¾
Depending on the degree of protection, INTORQ components may have both live (voltage carrying),
moving and rotating parts. Such components require the appropriate safety mechanisms.
¾
Surfaces can become hot during operation. Take the appropriate safety measures (to ensure contact/
touch protection).
¾
Follow all specifications and information found in the Operating Instructions and the corresponding
documentation. These must be followed to maintain safe, trouble-free operations and to achieve the
specified product characteristics.
¾
The installation, maintenance and operation of INTORQ components may only be carried out by quali-
fied personnel. According to IEC 60364 and CENELEC HD 384, skilled personnel must be qualified in
the following areas:
– Familiarity and experience with the installation, assembly, commissioning and operation of the
product.
– Specialist qualifications for the specific field of activity.
– Skilled personnel must know and apply all regulations for the prevention of accidents, directives,
and laws relevant on site.
2.2 Disposal
The INTORQ components are made of various differing materials.
¾
Recycle metals and plastics.
¾
Ensure professional disposal of assembled PCBs according to the applicable environmental regula-
tions.

Product description
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3 Product description
3.1 Proper and intended usage
3.1.1 Standard applications
INTORQ components are intended for use in machinery and facilities. They may only be used for pur-
poses as specified in the order and confirmed by INTORQ. The INTORQ components may only be oper-
ated under the conditions specified in these Operating Instructions. They may never be operated beyond
their specified performance limits. The technical specifications (refer to Technical specifica-
tions,Page15) must be followed to comply with the proper and intended usage. Any other usage is con-
sider improper and prohibited.
3.2 Layout
Fig.1: Layout of an INTORQ BFK464-□□R spring-applied brake Complete stator + rotor + flange
AStator BSocket-head cap screw CCoil
DSleeve EArmature plate FFlange (optional)
GRotor HHub (optional) INoise reducer
The BFK464-R spring-applied brake is a single-disk brake with two friction surfaces. The braking torque is
applied through two separate braking circuits, both electrical and mechanical, via several compression
springs in the form of friction locking. The brake circuits are released electromagnetically. Due to its divi-
sion into two brake circuits, the brake is particularly suitable for applications such as lift systems and
stage/platform technology. The brake can be selected based on the rated torque for one brake circuit. The
second brake circuit meets the requirement for redundancy (refer to Rated data for coil power,Page16).

Product description
INTORQ | BA 14.0214 | 10/2019 12
The division of the brake circuits is done using a two-part armature disk with the associated compression
springs and electromagnetic coils. Each brake circuit can be operated individually due to the separate sup-
ply lines for each stator and armature plate (siehe ).
Each brake circuit has a micro-switch which monitors the switching state of the spring-applied brake. Us-
ing the associated switching device, the supply voltage (AC voltage) is rectified and, when the brake is re-
leased, lowered after a short period of time. This results in a reduction of the average electrical power of
the brake.
The BFK464 spring-applied brake (with the high rated torque for the respective size) is designed for a
maximum duty cycle of 60% with holding current reduction. The brakes with the lower rated torques are
suitable for a maximum 60% duty cycle with no holding current reduction. The permissible operating fre-
quency for both versions in each size is 180 1/h (with a short-term maximum of 240 1/h).
Size Rated torque
MK [Nm]
EC-type examination certificate
Directive 2014/33/EC
17R 2 x 75 EU-BD 1051
2 x 150
18R 2 x 170 EU-BD 1056
2 x 280
19R 2 x 210 EU-BD 1055
2 x 350
20R 2 x 280 EU-BD 1034
2 x 450
22R 2 x 360 EU-BD 1054
2 x 600
25R 2 x 540 EU-BD 1053
2 x 900
28R 2 x 720 EU-BD 1052
2 x 1200

Product description
INTORQ | BA 14.0214 | 10/2019 13
3.3 Function
This brake is an electrically releasable spring-applied brake with a rotating brake disc (rotor) that is
equipped on both sides with friction linings. In its de-energised state, the rotor is clamped with braking
force applied by pressure springs between the armature plate and a counter friction surface. This corres-
ponds to a fail-safe functionality.
The brake torque applied to the rotor is transferred to the input shaft via a hub that has axial gear teeth.
The brake can be used as a holding brake, as an operating brake, and as an emergency stop brake for
high speeds.
The asbestos-free friction linings ensure a safe braking torque and low wear.
To release the brake, the armature plate is released electromagnetically from the rotor. The rotor, shifted
axially and balanced by the spring force, can rotate freely.
3.4 Braking and release
During the braking procedure, the inner and outer springs use the armature plate to press the rotor (which
can be shifted axially on the hub) against the friction surface. The asbestos-free friction linings ensure high
braking torque and low wear. The braking torque is transmitted between the hub and the rotor via gear
teeth.
When the brakes are applied, an air gap (sL) is present between the stator and the armature plate. To re-
lease the brake, the coil of the stator is energised with the DC voltage provided. 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.
3.5 Project planning notes
¾
When designing a brake for specific applications, torque tolerances, the limiting speeds of the rotors,
the thermal resistance of the brake, and the effect of environmental influences must all be taken into
account.
¾
The brakes are dimensioned in such a way that the specified rated torques are reached safely after a
short run-in process.
¾
However, as the organic friction linings used do not all have identical properties and because environ-
mental conditions can vary, deviations from the specified braking torques are possible. These must be
taken into account in the form of appropriate dimensioning tolerances. Increased breakaway torque is
common in particular after long downtimes in humid environments where temperatures vary.
¾
If the brake is used as a pure holding brake without dynamic load, the friction lining must be reactiv-
ated regularly.

Product description
INTORQ | BA 14.0214 | 10/2019 14
3.6 Optional configuration
3.6.1 Hand-release (optional)
To temporarily release the brake when there is no electricity available, a hand-release function is available
as an option. The hand-release function can be retrofitted.
3.6.2 Optional micro-switch
The micro-switch is used for the release monitoring or for wear monitoring. The user is responsible for ar-
ranging the electrical connection for this optional micro-switch.
¾
Usage for the (air) release monitoring: The motor will start only after the brake has been released. This
enables the micro-switch to monitor for errors (e.g. when the motor does not start because of a defect-
ive rectifier, if there are broken connection cables, defective coils, or an excessive air gap).
¾
Usage for monitoring wear: The brake and motor are not supplied with power when the air gap is too
large.
3.6.3 Optional encapsulated design
This design not only prevents the penetration of spray water and dust, but also the spreading of abrasion
particles outside the brake. This is achieved by the following enclosures:
¾
A cover ring over the armature plate and rotor.

Technical specifications
INTORQ | BA 14.0214 | 10/2019 15
4 Technical specifications
4.1 Possible applications of the INTORQ spring-applied brake
¾
Degree of protection:
– The brake is designed for operation under the environmental conditions that apply to IP54 protec-
tion. Because of the numerous possibilities of using the brake, it is still necessary to check the func-
tionality of all mechanical components under the corresponding operating conditions.
¾
Ambient temperature:
– -20 °C to +40 °C (Standard)
4.2 Rated data
Fig.2: Air gap measurement
Size Air gap Permissible
wear distance
Rotor thickness Mass of stator
sLN
+0.06/-0.08 sLmax Min. Max. m
[mm] [mm] [mm] [mm] [mm] [kg]
17R
0.4 0.6 0.2 12.7 13.0
12.4
18R 19.2
19R 22.5
20R 26.5
22R 31.0
25R 41.5
28R 0.5 0.8 0.3 12.6 55.5
Tab.1: Rated data for air gap specifications

Technical specifications
INTORQ | BA 14.0214 | 10/2019 16
Size Screw hole circle Fastening screws DIN 912 Minimum thread
depth
Tightening torque
MA
Diameter Thread without
flange
with
flange
without
flange
with
flange1)
without
flange
with
flange1)
[mm] [mm] [mm] [mm] [mm] [Nm] [Nm]
17R 176 M8 6 x M8x85 6 x M8x95 13.0 12.0 24.6 24.6
18R 212 6 x M8x95 6 x M8x1051) 30.4
19R 220
M10
6 x M10x100 6 x M10x110 16.0 15.0
48.0
48.0
20R 233 6 x M10x110 6 x M10x1201) 21.0 20.0 66.5
22R 252
25R 282 M12 6 x M12x110 6 x M12x1301) 18.0 25.0 84.0 104.7
28R 314 M16 6 x M16x130 6 x M16x140 30.0 27.5 206.0 206.0
Tab.2: Rated data for the screw set for brake mounting
1) Bolt fastening class 10.9 with washers in accordance with ISO 7089--300HV-A2C
CAUTION
¾
The screws for the different brake attachment variants have different strength grades
and may have special surface coatings. In order to guarantee a secure screw connec-
tion, use ONLY the proper screws from INTORQ!
¾
It is very important to comply with the minimum thread depth of the end shield (refer to
Rated data for the screw set for brake mounting,Page16).
¾
If the required thread depth is not maintained, the fastening screws may run onto the
thread root. This has the effect that the required pre-load force is no longer established
– the brake is no longer securely fastened!
Size Rated torque1) Voltage Power2) Coil resistance Current3)
Release ±10% Hold ±10% Brake release Brake hold
MKULUHPNPHRN
±5% IL
[Nm] [V DC] [V DC] [W] [W] [Ω] [A]
17R
2 x 75 205 205 2 x 75 2 x 75 2 x 560 2 x 0.37
103 103 2 x 142 2 x 0.73
2 x 150 205 103 2 x 200 2 x 50 2 x 210 2 x 0.98
103 51.5 2 x 52 2 x 1.99
18R
2 x 170 205 205 2 x 88 2 x 88 2 x 478 2 x 0.43
103 103 2 x 121 2 x 0.85
2 x 280 205 103 2 x 230 2 x 57.5 2 x 183 2 x 1.12
103 51.5 2 x 46 2 x 2.23

Technical specifications
INTORQ | BA 14.0214 | 10/2019 17
Size Rated torque1) Voltage Power2) Coil resistance Current3)
Release ±10% Hold ±10% Brake release Brake hold
MKULUHPNPHRN
±5% IL
[Nm] [V DC] [V DC] [W] [W] [Ω] [A]
19R
2 x 210 205 205 2 x 95 2 x 95 2 x 442 2 x 0.46
103 103 2 x 112 2 x 0.92
2 x 350 205 103 2 x 245 2 x 61 2 x 172 2 x 1.20
103 51.5 2 x 43 2 x 2.38
20R
2 x 280 205 205 2 x 100 2 x 100 2 x 420 2 x 0.49
103 103 2 x 106 2 x 0.97
2 x 450 205 103 2 x 270 2 x 67.5 2 x 156 2 x 1.32
103 51.5 2 x 39 2 x 2.62
22R
2 x 360 205 205 2 x 110 2 x 110 2 x 382 2 x 0.54
103 103 2 x 96 2 x 1.07
2 x 600 205 103 2 x 285 2 x 71 2 x 147 2 x 1.39
103 51.5 2 x 37 2 x 2.77
25R
2 x 540 205 205 2 x 120 2 x 120 2 x 350 2 x 0.59
103 103 2 x 88 2 x 1.17
2 x 900 205 103 2 x 300 2 x 75 2 x 140 2 x 1.46
103 51.5 2 x 35 2 x 2.91
28R
2 x 720 205 205 2 x 160 2 x 160 2 x 262 2 x 0.78
103 103 2 x 66 2 x 1.55
2 x 1200 205 103 2 x 400 2 x 100 2 x 106 2 x 1.95
103 51.5 2 x 26 2 x 3.88
Tab.3: Rated data for coil power
1) Minimum braking torque with run-in friction pairs at Δn = 100 rpm
2) Power at 20 °C
3) Current at 20 °C during brake release

Technical specifications
INTORQ | BA 14.0214 | 10/2019 18
4.3 Switching times
The operating times listed here are guide values which apply to DC switching with rated air gap sLN, warm
coil and standard characteristic torque. The operating times given are mean values and subject to vari-
ations. The engagement time t1 is approximately 8 to 10 times longer for AC switching. ...
t
t
M
t2
t12
t11
t1
Mdyn
U
0.1Mdyn
Fig.3: Operating/switching times of the spring-applied brakes
t1Engagement time t11 Delay time during engagement
t2Disengagement time (up to M = 0.1 Mdyn)t12 Rise time of the braking torque
Mdyn Braking torque at a constant speed of rotation UVoltage
Size Rated
torque
Max. permiss-
ible switching
energy
Transitional
operating
frequency
Switching times Max.
speed
DC-side engagement Disengaging
MKQEShue t10
1) t90
1) t11.AC
2) t1.AC
2) t2ab @sLN
3) t2ab@sLmax
3) nmax
5)
[Nm] [J] [1/h] [ms] [ms] [ms] [ms] [ms] [ms] [rpm]
17R 2 x 75 42000 25 68 140 275 530 180 339
900
17R4) 2 x 150 39 77 150 315 134 194
18R 2 x 170 60000 20 86 172 350 800 234 365
18R4) 2 x 280 55 100 225 615 169 265
19R 2 x 210 68000 19 100 182 425 1025 240 435
19R4) 2 x 350 53 116 225 735 180 310
20R 2 x 280 80000 19 87 175 350 1100 334 700
20R4) 2 x 450 49 106 200 830 216 390
22R 2 x 360 90000 18 95 207 350 1160 323 622 750
22R4) 2 x 600 53 125 200 890 234 400
25R 2 x 540 120000 15 130 250 450 1410 362 800 700
25R4) 2 x 900 73 153 250 970 287 480 600

Technical specifications
INTORQ | BA 14.0214 | 10/2019 19
Size Rated
torque
Max. permiss-
ible switching
energy
Transitional
operating
frequency
Switching times Max.
speed
DC-side engagement Disengaging
MKQEShue t10
1) t90
1) t11.AC
2) t1.AC
2) t2ab @sLN
3) t2ab@sLmax
3) nmax
5)
[Nm] [J] [1/h] [ms] [ms] [ms] [ms] [ms] [ms] [rpm]
28R 2 x 720 180000 14 141 277 500 1490 402 750 600
28R4) 2 x 1200 69 176 300 1050 298 500 500
Tab.4: Switching energy - operating frequency - operating times
1) Operating/switching times, according to type examination certificate, are based on the rated torque. t50 = (t10 + t90) / 2.
2) Operating times refer to steady braking torque.
3) Venting times under unfavorable conditions (240 switching operations per hour, 60% DC, 40 °C ambient temperature).
4) Brake supplied with over-excitation (release voltage / holding voltage = 2/1).
5) Max. speed according to type examination certificate (for higher speeds, please first contact the manufacturer).
Engagement time
The transition from a brake-torque-free state to a holding-braking torque is not free of time lags.
For emergency braking, short engagement times for the brake are absolutely essential. The DC-side
switching in connection with a suitable spark suppressor must therefore be provided.
Engagement time for AC-side switching: The engagement time is significantly longer (approx. 5 times
longer).
NOTICE
Connect the spark suppressors in parallel to the contact. If this is not admissible for safety
reasons (e.g. with hoists and lifts), the spark suppressor can also be connected in parallel
to the brake coil.
¾
If the drive system is operated with a frequency inverter so that the brake will not be de-energized be-
fore the motor is at standstill, AC switching is also possible (not applicable to emergency braking).
¾
The specified engagement times are valid for DC switching with a spark suppressor.
– Circuit proposals: refer to DC switching at mains – fast engagement.
Notice
Spark suppressors are available for the rated voltages.
Disengagement time
The disengagement time is the same for DC-side and AC-side switching. The specified disengagement
times always refer to control using INTORQ rectifiers and rated voltage.

Technical specifications
INTORQ | BA 14.0214 | 10/2019 20
4.4 Friction work / operating frequency
Friction work Q [J]
R
Operating frequency Sh[h ]
-1
1000000
100000
10000
1000
100
10
1 10 100 1000 10000
28R
25R
22R 20R
19R
18R
17R
Fig.4: Friction work as a function of the operating frequency
–Shue
–
1
QR
QE
Shmax
In
=
– e
1
Qhmax QE
=
–Shue
Sh
The permissible operating frequency Shmax depends on the amount of heat QR (refer to Figure Friction
work / operating frequency,Page20). At a pre-set operating frequency Sh, the permissible amount of
heat is QSmax.
Notice
With high speeds of rotation and switching energy, the wear increases, because very high
temperatures occur at the friction surfaces for a short time.
This manual suits for next models
7
Table of contents
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