Kendrion INTORQ BFK458-ATEX User manual

INTORQ BFK458-ATEX
Spring-applied brake with electromagnetic release
Translation of the Original Operating Instructions
www.kendrion.com

Document history
Material number Version Description
33007851 1.0 09/2019 SC First edition
33007851 2.0 07/2021 SC Change of name to Kendrion INTORQ
Changes to Chapter 6.1, additions to Chapters 9.2 and 9.3
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 infor-
mation, illustrations and descriptions.
¾
We do not accept any liability for damage and operating interference caused by:
– inappropriate use
– unauthorized modifications to the product
– improper work on or with the product
– operating errors
– disregarding the documentation
Warranty
Notice
The warranty conditions can be found in the terms and conditions of Kendrion INTORQ
GmbH.
¾
Warranty claims must be made to Kendrion INTORQ immediately after the defects or faults are detected.
¾
The warranty is void in all cases when liability claims cannot be made.
Kendrion INTORQ | BA 14.0217 | 07/2021 2

Spring-applied brakes of type BFK458-06...25
Design E Design N
Double spring-applied brake
Kendrion INTORQ | BA 14.0217 | 07/2021 3

Product key
Product group: Brakes
Product family: Spring-applied brake
Type: 458
Size: 06, 08, 10, 12, 14, 16, 18, 20, 25
Design/type:
E - adjustable (brake torque can be reduced via torque adjustment ring)
N - not adjustable
L – not adjustable, long-life design
B FKINTORQ
Not coded: Connection voltage, hub bore diameter, options
Checking the delivery
After receipt of the delivery, check immediately whether the items delivered match the accompanying pa-
pers.
Kendrion INTORQ does not accept any liability for deficiencies claimed subsequently.
¾
Claim visible transport damage immediately to the deliverer.
¾
Claim visible defects or incompleteness of the delivery immediately to Kendrion INTORQ.
Kendrion INTORQ | BA 14.0217 | 07/2021 4

Contents
Legal regulations ....................................................................................................................................................... 2
Warranty...................................................................................................................................................................... 2
Spring-applied brakes of type BFK458-06...25........................................................................................................ 3
Product key................................................................................................................................................................. 4
Checking the delivery................................................................................................................................................ 4
1 General information................................................................................................................................................... 8
1.1 Using these Operating Instructions...................................................................................................................... 8
1.2 Conventions in use............................................................................................................................................... 8
1.3 Safety instructions and notices ............................................................................................................................ 8
1.4 Terminology used................................................................................................................................................. 9
1.5 Abbreviations used............................................................................................................................................. 10
2 Safety instructions................................................................................................................................................... 12
2.1 General safety instructions................................................................................................................................. 12
2.2 Safety notices for use in potentially explosive areas.......................................................................................... 13
2.3 Disposal ............................................................................................................................................................. 13
3 Product description ................................................................................................................................................. 14
3.1 Proper and intended usage................................................................................................................................ 14
3.1.1 Standard applications............................................................................................................................ 14
3.2 Design................................................................................................................................................................ 15
3.2.1 Spring-applied brake as holding/parking brake ..................................................................................... 15
3.2.2 Spring-applied brake used as a holding brake with emergency-stop function and as a service brake..15
3.2.3 Basic module E...................................................................................................................................... 16
3.2.4 Basic module N ..................................................................................................................................... 17
3.2.5 Basic module L...................................................................................................................................... 17
3.2.6 Double spring-applied brake.................................................................................................................. 18
3.3 Function ............................................................................................................................................................. 18
3.4 Braking and release ........................................................................................................................................... 19
3.5 Brake torque reduction....................................................................................................................................... 19
3.6 Optional configuration ........................................................................................................................................ 19
3.6.1 Hand-release (optional)......................................................................................................................... 19
4 Project planning notes ............................................................................................................................................ 20
Kendrion INTORQ | BA 14.0217 | 07/2021 5

5 Technical specifications.......................................................................................................................................... 21
5.1 General information............................................................................................................................................ 21
5.2 Possible applications of the Kendrion INTORQspring-applied brake................................................................. 21
5.3 Brake torques..................................................................................................................................................... 22
5.4 Characteristics ................................................................................................................................................... 23
5.5 Operating times.................................................................................................................................................. 28
5.6 Friction work / operating frequency.................................................................................................................... 30
5.7 Dust explosive atmosphere (zone 22: non-conductive dusts)............................................................................ 30
5.8 Gas explosive atmosphere (zone 2) .................................................................................................................. 32
5.9 Example calculation for the charts ..................................................................................................................... 35
5.10 Electromagnetic compatibility............................................................................................................................. 35
5.11 Emissions........................................................................................................................................................... 36
5.12 Hand-release...................................................................................................................................................... 36
5.13 Labels on product............................................................................................................................................... 37
5.14 ATEX marking.................................................................................................................................................... 39
6 Mechanical installation............................................................................................................................................ 40
6.1 Design of end shield and shaft........................................................................................................................... 41
6.2 Tools .................................................................................................................................................................. 42
6.3 Preparing the installation.................................................................................................................................... 42
6.4 Installing the hub onto the shaft ......................................................................................................................... 43
6.5 Mounting the brake ............................................................................................................................................ 44
6.6 Installing the friction plate (optional)................................................................................................................... 47
6.7 Mounting the flange............................................................................................................................................ 47
6.7.1 Mounting the flange without additional screws...................................................................................... 47
6.7.2 Installing the flange (variants: size 06 - 16)........................................................................................... 48
6.7.3 Installing the flange (variants: size 18 - 20)........................................................................................... 49
6.7.4 Installing the flange (variants: size 25) .................................................................................................. 50
6.8 Installing the double spring-applied brake.......................................................................................................... 51
6.9 Cover ring assembly .......................................................................................................................................... 52
6.10 Installing the shaft sealing ring........................................................................................................................... 53
6.11 Mounting the hand-release (retrofitting)............................................................................................................. 54
Kendrion INTORQ | BA 14.0217 | 07/2021 6

7 Electrical installation ............................................................................................................................................... 55
7.1 Electrical connection .......................................................................................................................................... 55
7.2 AC switching at the motor – extremely delayed engagement ............................................................................ 56
7.3 DC switching at the motor – fast engagement ................................................................................................... 57
7.4 AC switching at mains – delayed engagement .................................................................................................. 58
7.5 DC switching at mains – fast engagement......................................................................................................... 59
7.6 Minimum bending radius for the brake connection cable................................................................................... 60
7.7 Bridge/half-wave rectifier (optional).................................................................................................................... 60
7.7.1 Assignment: Bridge/half-wave rectifier – brake size.............................................................................. 61
7.7.2 Technical specifications......................................................................................................................... 61
7.7.3 Reduced switch-off times ...................................................................................................................... 62
7.7.4 Permissible current load at ambient temperature.................................................................................. 62
8 Commissioning and operation ............................................................................................................................... 63
8.1 Possible applications of the Kendrion INTORQ spring-applied brake................................................................ 63
8.2 Function checks before initial commissioning .................................................................................................... 64
8.2.1 Function check of the brake .................................................................................................................. 64
8.2.2 Release / voltage control....................................................................................................................... 64
8.2.3 Testing the hand-release functionality................................................................................................... 65
8.3 Commissioning................................................................................................................................................... 66
8.4 Operation ........................................................................................................................................................... 67
8.4.1 Brake torque reduction (for the optional adjustable braking torque)...................................................... 68
8.4.2 Operating procedures............................................................................................................................ 68
9 Maintenance and repair........................................................................................................................................... 69
9.1 Wear of spring-applied brakes ........................................................................................................................... 69
9.2 Inspections......................................................................................................................................................... 70
9.2.1 Maintenance intervals............................................................................................................................ 71
9.3 Maintenance....................................................................................................................................................... 71
9.3.1 Brake testing.......................................................................................................................................... 72
9.3.2 Checking the air gap.............................................................................................................................. 73
9.3.3 Release / voltage................................................................................................................................... 73
9.3.4 Adjusting the air gap.............................................................................................................................. 74
9.3.5 Checking the rotor thickness ................................................................................................................. 74
9.3.6 Replacing the rotor ................................................................................................................................ 74
9.4 Spare parts list ................................................................................................................................................... 76
10 Troubleshooting and fault elimination................................................................................................................... 79
Kendrion INTORQ | BA 14.0217 | 07/2021 7

General information
Kendrion INTORQ | BA 14.0217 | 07/2021 8
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 Underlined, red _____
Reference to another page with additional
information
For example: Using these Operating In-
structions,Page8
Symbols
Wildcard □
Wildcard (placeholder) for options or selec-
tion details
For example: BFK458-□□ = BFK458-10
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
Kendrion INTORQ | BA 14.0217 | 07/2021 9
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 consequences
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 compo-
nents

General information
Kendrion INTORQ | BA 14.0217 | 07/2021 10
1.5 Abbreviations used
Letter symbol Unit Designation
FRN Rated frictional force
F N Spring 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
M4Nm Torque that can be transmitted without slippage occurring (DIN VDE 0580)
MANm Tightening torque of fastening screws
Mdyn Nm Average torque from initial speed to standstill
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
RNOhms Rated coil resistance at 20 °C
Rzμm Averaged surface roughness
Sh1/h Operating frequency: the number of switching operations evenly distributed
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
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
Kendrion INTORQ | BA 14.0217 | 07/2021 11
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
Kendrion INTORQ | BA 14.0217 | 07/2021 12
2 Safety instructions
2.1 General safety instructions
¾
Never operate Kendrion INTORQ components when you notice they are damaged.
¾
Never make any technical changes to Kendrion INTORQ components.
¾
Never operate Kendrion INTORQ components when they are incompletely mounted or incompletely
connected.
¾
Never operate Kendrion INTORQ components without their required covers.
¾
Only use accessories that have been approved by Kendrion 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, Kendrion INTORQ components may have both live (voltage
carrying), moving and rotating parts. Such components require appropriate safety mechanisms.
¾
Surfaces can become hot during operation. Take 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 Kendrion INTORQ components may only be carried out
by qualified 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.

Safety instructions
Kendrion INTORQ | BA 14.0217 | 07/2021 13
2.2 Safety notices for use in potentially explosive areas
DANGER
Danger of explosion
Increased temperatures on the surfaces and in the friction gap can result when the maxi-
mum friction work and operating frequencies specified by Kendrion INTORQ are ex-
ceeded. These can lead to ignition.
¾
Operation is only permitted within the specified specifications.
¾
The characteristic curve for the friction work (in the sections Dust explosive atmosphere (zone 22: non-
conductive dusts),Page30 and Gas explosive atmosphere (zone 2),Page32) as a function of the
operating frequency must not be exceeded when in an explosive atmosphere or even in emergency-
stop mode.
¾
If the facility operator cannot ensure that the specified friction work and operating frequencies will be
complied with, then the temperatures defined on the ATEX name plate for the dust zone must be moni-
tored on the brake's magnet housing using a suitable temperature measurement mechanism. If there is
no available knowledge of the occurring temperatures, then Kendrion INTORQ is no longer responsible
for this ATEX certification.
¾
In an explosive gas atmosphere, the resulting frictional heat in the friction gap created during the brak-
ing process creates a potential source of ignition. It is not possible here to measure the temperature
during braking operations. Thus, it is very important to comply with the specified values for the friction
work and operating frequencies. If the values for the actual friction work and operating frequencies are
not known, the brake must not be put into operation in this atmosphere.
2.3 Disposal
The Kendrion 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
Kendrion INTORQ | BA 14.0217 | 07/2021 14
3 Product description
3.1 Proper and intended usage
3.1.1 Standard applications
Kendrion INTORQ components are intended for use in machinery and facilities. They may only be used
for purposes as specified in the order and confirmed by Kendrion INTORQ. The Kendrion INTORQ com-
ponents may only be operated under the conditions specified in these Operating Instructions. They may
never be operated beyond their specified performance limits. The technical specifications (refer to Techni-
cal specifications) must be followed to comply with the proper and intended usage. Any other usage is
consider improper and prohibited.
3.1.1.1 ATEX
The following is required for safely operating the Kendrion INTORQ spring-applied brakes BFK458 in haz-
ardous areas, device category 3, zone 2/22:
The Kendrion INTORQ spring-applied brakes BFK458 described may only be used in normal operations
within the following areas:
¾
Where an explosive atmosphere caused by gases, vapors, mists or swirled up dust is not expected,
¾
Or where, if these conditions nevertheless occur, then the use under these conditions may only take
place rarely and for a short period of time in the sense of the ATEX guideline 2014/34/EU.
Kendrion INTORQ spring-applied brakes must never be operated outside the performance limits corre-
sponding to ATEX brakes!
NOTICE
If the spring-applied brake shall be used as a holding/parking brake (refer to the name plate),
all braking torques listed in the BFK458 spring-applied brake catalog are permissible.
DANGER
Danger of explosion
Increased temperatures on the surfaces and in the friction gap can result when the maxi-
mum friction work and operating frequencies specified by Kendrion INTORQ are ex-
ceeded. These can lead to ignition.
¾
Operation is only permitted within the specified specifications.
The following must always be observed when installing ATEX brakes:
¾
The proper functioning and correct dimensioning of the brake must be ensured before it is put into op-
eration. The correct relation between the brake, motor, control and loads must be checked.
¾
If the switching times of the brake in conjunction with the control of the drive is not properly taken into
consideration, the rotational speed could increase when the motor is switched off. As a result, the brak-
ing procedure would be carried out at a much higher speed and higher friction work than assumed in
the preliminary design. This would result in higher temperatures, which would then pose a risk of igni-
tion.

Product description
Kendrion INTORQ | BA 14.0217 | 07/2021 15
¾
Check if the rotor can be pushed when it is mounted on the hub. A sluggish heavy connection between
the rotor and hub can lead to a continuous slip of the rotor. This would increase the temperature at the
friction joint.
¾
Make sure that the air gap is properly and uniformly adjusted. An uneven air gap adjustment can lead
to continuous slip of the rotor and thus to increased temperatures.
¾
When installing and dismantling the brake, make sure that no solids fall into the friction gap.
¾
Careless assembly, disassembly or operations can lead to sparking. Do not use spark-generating
tools.
¾
Mount the brake so that it does not hit any rotating components. Ensure that there is sufficient clear-
ance to the fan hood and fan blade.
3.2 Design
This chapter describes the variants, design and functionality of the INTORQ BFK458 spring-applied brake.
The basic module E is adjustable (the braking torque can be reduced using the torque adjustment ring).
The special feature for basic module L (with an identical design) is the more durable materials (torque sup-
port, guide pins, toothed intermediate ring, friction lining and gear teeth). The double spring-applied brake
design is especially useful in redundant braking applications.
3.2.1 Spring-applied brake as holding/parking brake
If the spring-applied brake shall be used as a holding/parking brake, all braking torques listed in the
BFK458 spring-applied brake catalog and in the BA14.0186 Operating Instructions are permissible.
The spring-applied brake is identified as a holding brake by the additional notice ("Holding brake") that is
found on an additional name plate.
Example of this marking:
Haltebremse / holding brake
II 3G Ex ec IIC T4 Gc X
II 3D Ex tc IIIB 120°C Dc X
3.2.2 Spring-applied brake used as a holding brake with emergency-stop function and as a
service brake
When using the spring-applied brake as a holding brake with emergency-stop functionality or as a service
brake in an explosive atmosphere, it is absolutely necessary to increase the degree of protection of the
brake. The following measures must be implemented:
¾
Use the brake with a cover ring (without a condensate drain hole) and consequently also with the
Kendrion INTORQ flange/friction plate and the corresponding ring nut for attaching the cover ring (refer
to the section Cover ring assembly,Page52).
¾
Close the rear bore holes in the torque adjustment ring or in the magnet housing with a suitable radial
shaft seal or a sealing cover (refer to the section Installing the shaft sealing ring,Page53).
¾
Closing the hand vent holes using (for example) suitable plastic plugs and a suitable sealant.

Product description
Kendrion INTORQ | BA 14.0217 | 07/2021 16
The following table shows the assignments for the ID numbers of the cover rings and the sealing covers
for the different sizes and the basic models N and E:
Size Kendrion INTORQ ID number
Taper plug
Cover ring
Sealing cover Radial shaft
sealing ring
Basic Model N Basic module E
06 405194 398804 405719
Request the ID
number correspond-
ing to the shaft di-
ameter from
Kendrion INTORQ.
GPN 605/1648
(from the manufac-
turer Pöppelmann)
08 405197 398805 390665
10 405198 379810 131444
12 405199 398802 76767
14 405201 398803 73355
16 405202 398801 73355
18 120591 381517 73356
20 120592 364510 73357
25 120593 379257 364510
Tab.1: ID number: Assignment of the cover rings and sealing covers for the basic models N and E
3.2.3 Basic module E
Fig.1: Design of a INTORQ BFK458 spring-applied brake Basic module E (complete stator) + rotor + hub + flange
ATappet BTorque adjustment ring CStator
DSocket-head cap screw EHand-release (optional) FSleeve bolt
GFlange HRotor IHub
JPressure spring KArmature plate

Product description
Kendrion INTORQ | BA 14.0217 | 07/2021 17
3.2.4 Basic module N
Fig.2: Design of a INTORQ BFK458 spring-applied brake Basic module N (complete stator) + rotor + hub + flange
AStator BSocket-head cap screw CHand-release (optional)
DSleeve bolt ERotor FHub
GPressure spring HArmature plate IFlange
3.2.5 Basic module L
Description of the long-life design:
¾
Armature plate with low backlash and reinforced torque support
¾
Pressure springs with guide pins for protection against shearing forces
¾
Aluminum rotor with toothed intermediate ring: Low-wear friction lining and low-wear gear teeth.
The long-life design can be configured modularly for size 6 to size 12 in combination with the specified
rated torques. The specifications are as follows:
¾
The stator corresponds to the design N.
¾
Rear bores and extensions are not possible.

Product description
Kendrion INTORQ | BA 14.0217 | 07/2021 18
3.2.6 Double spring-applied brake
Fig.3: Design of a INTORQ BFK458 spring-applied brake Basic module N, doubled design with intermediate flange
AStator BSocket-head cap screw CScrew for intermediate flange
DIntermediate flange EHand-release (optional) FSleeve bolt
GFlange HHub IRotor
JPressure spring KArmature plate
Notice
A version of the double spring-applied brake using HFC (high-friction coefficient) linings is not
permitted.
3.3 Function
This brake is an electrically releasable spring-applied brake with a rotating brake disk (rotor) that is
equipped on both sides with friction linings. In its de-energized state, the rotor is clamped with braking
force applied by pressure springs between the armature plate and a counter friction surface. This corre-
sponds 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 a service 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.

Product description
Kendrion INTORQ | BA 14.0217 | 07/2021 19
3.4 Braking and release
During the braking procedure, the pressure springs use the armature plate to press the rotor (which can
be shifted axially on the hub) against the friction surface. 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 energized 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 Brake torque reduction
For the basic module E, the spring force and thus the brake torque can be reduced by unscrewing the
central torque adjustment ring.
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 also be retrofitted.

Project planning notes
Kendrion INTORQ | BA 14.0217 | 07/2021 20
4 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 effects 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
Since the material properties of the friction linings are subject to fluctuations and as a result of different
environmental conditions, deviations from the specified braking torque are possible. This has to be
taken into account by appropriate dimensioning of the tolerances. Increased breakaway torque can oc-
cur in particular as an result of long standstill periods in humid environments with variing temperatures.
¾
If the brake is used as a pure holding brake without dynamic load, the friction lining must be reacti-
vated regularly.
¾
You must comply with all technical specifications in order to ensure trouble-free operations of the
ATEX brake. In particular, the user-specific dimensioning of the brake must be checked according to
the specified limits of the friction performance charts (refer to Technical specifications,Page21 ). If
the limit values from the friction performance charts are not adhered to, the brake and the friction sur-
face may overheat, which would lead to a risk of ignition. In such as case, the brake is no longer com-
pliant with the ATEX standards.
¾
The permissible operating frequency (number of switching operations) corresponding to the required
friction work is determined from the friction performance charts. The number of switching operations
must be evenly distributed over the course of one hour.
¾
The correct relation between the brake, motor, control and loads must be taken into account when di-
mensioning the brake.
¾
If the operating times of the brake in conjunction with the control of the drive is not properly taken into
consideration, the rotational speed could increase when the motor is switched off. As a result, the brak-
ing procedure would be carried out at a much higher speed and higher friction work than assumed in
the preliminary design. This would result in higher temperatures, which would then pose a risk of igni-
tion.
¾
Use only original Kendrion INTORQ friction parts (flange and armature plate) and standard friction lin-
ings (ST) for the ATEX brake.
¾
The brake is designed with one free cable end. This cable must be inserted into a suitable terminal box
(through a cable gland) in accordance with the ATEX directives.
¾
Kendrion INTORQ half-wave and bridge rectifiers and spark suppressors have not been designed for
use in potentially explosive atmospheres. If the use of these electrical components is necessary, they
must be installed within a control cabinet that is outside the explosive atmosphere.
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To temporarily release the brake when there is no electricity available, a hand-release function is avail-
able as an option. The hand-release function can be retrofitted; for this, the hand-release holes in the
magnetic housing of the brake must be closed.
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The use of a micro-switch for monitoring ventilation, wear and manual release is not permitted for
brakes that are used in an explosive atmosphere.