Mayr ROBA-servostop 8981.29 01 Quick start guide

Safety brake for servomotors
ROBA®-servostop Cobot
Type 8981.29_01
Sizes 40 –100
Issue status 2022-10
Translation of the Original Operational
Instructions
B.8981.EN
© Copyright by mayr®–power transmission
All rights reserved.
Reprints and copies –even extracts –are only permitted with the consent of the manufacturer.
your reliable partner

Installation and operational instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 2 of 27 www.mayr.com, E-Mail: [e-mail]
your reliable partner
Contents
1General Guidelines............................................. 3
1.1 Definition of Terms 3
2Safety................................................................... 4
2.1 Safety and Guideline Signs 4
2.2 General Guidelines 4
2.2.1 Personnel Requirements 4
2.3 Intended Use 5
2.4 Handling 5
2.5 User-implemented Protective Measures 5
2.6 Dimensioning Other Machine Elements 5
3Legal Provisions................................................. 6
3.1 Directives, Standards and Regulations Used 6
3.2 Liability 6
3.3 Guarantee 6
3.4 Guidelines on CE Identification 7
3.5 CE Identification 8
3.6 Identification/ Type tag 8
4Product Description ........................................... 9
4.1 Scope of Delivery / State of Delivery 9
4.2 Function 9
4.2.1 Quiescent Current Principle 9
4.3 Views 10
4.4 Parts List (Only use mayroriginal parts) 11
5Technical Data.................................................... 12
5.1 Guidelines 12
5.1.1 Application Conditions 12
5.1.2 Ambient temperature/Climate Conditions 12
5.1.3 Class of Insulation F (+155 °C) 12
5.1.4 Protection 12
5.1.5 Noise Emissions 13
5.1.6 Installation Position 13
5.1.7 Pre-requisites for Product Application 13
5.2 Technical Data 14
5.2.1 General 14
5.2.2 Tightening torques 15
5.2.3 Friction work 15
5.2.4 Dimensions 16
5.2.5 Switching Times 17
6Intended Use....................................................... 18
6.1 Guidelines for Application 18
6.2 Limits 18
6.3 Reasonably Foreseeable Misuse 18
6.4 Duration of Use 18
6.5 Dimensioning 18
7Electrical Connection and Wiring......................19
7.1 Grounding Connection 19
7.2 Fuse Element 19
7.3 Switching Behavior 19
7.4 Switching Modes 19
7.4.2 Magnetic Field Removal 20
7.5 Protection Circuit 21
8Storage.................................................................21
8.1.1 Brake Storage 21
9Installation...........................................................22
9.1 Installation Conditions 22
9.2 Installation 22
9.2.1 Pre-requisites 22
9.2.2 Preparation 22
9.2.3 Protection against electric shock 22
9.3 Installation Procedure 23
9.3.1 Type 8981.29101 screw connection on the coil
carrier front 23
9.3.2 Type 8981.29001 screw connection on the coil
carrier back side 23
9.4 Electrical Connection 24
10 Initial Operation...................................................24
10.1 Definition of the Braking Torques 24
10.1.1 Static braking torque 24
10.1.2 Dynamic braking torque 24
10.2 Run-in Procedure 24
10.3 Brake Inspection (Before Initial Operation) 24
10.4 Brake Test (initial operation) 24
11 Maintenance / Inspection ...................................25
12 Wear.....................................................................25
12.1 Cleaning: 25
13 De-installation .....................................................25
14 Information on the Components........................25
15 Disposal...............................................................26
16 Malfunctions / Breakdowns................................27

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 3 of 27 www.mayr.com, E-Mail: [e-mail]
your reliable partner
Please read these Operational Instructions carefully and follow them accordingly!
Ignoring these Instructions may lead to malfunctions or to brake failure, resulting in damage to other parts. These Opera-
tional Instructions are part of the brake delivery.
Please keep them handy and near to the brake at all times.
1 General Guidelines
1.1 Definition of Terms
Term
Meaning
ROBA®-servostop
Electromagnetically-actuated safety brakes as a component for holding and de-
celeration of moved machine parts.
Nominal braking torque MN
The theoretical nominal braking torque assigned to the designation. The braking
torque lies within the stated braking torque tolerances.
The braking torque tolerance is stated in % of the braking torque Standard.
Load torque
Holding torque which is required to hold a vertical axis (load) suspended, refer-
ring to the brake.
Release (separate)
Release designates the procedure through which the magnetic coil is energised,
the rotor disk is released in the brake, and therefore no braking torque is applied.
Close (connect)
Closing or armature disk drop-out designates the process through which the
magnetic coil is de-energised, the voltage is switched off, the rotor in the brake is
clamped and the braking torque is applied.
Overexcitation
Overexcitation designates when the brake requires a higher supply voltage (=
overexcitation voltage) than the coil nominal voltage to release for a short period
of time (overexcitation time). Here a ratio of 2:1 or 3:1 is usual.
Overexcitation time
The overexcitation voltage must only be available for a short time for release of
the brake.
Response delay on connection t11
(close)
The time from power switch-off to the start of the braking torque increase (10 %
of the stated braking torque).
Connection time t1(drop-out time)
The time from power switch-off to achieving 90 % of the stated braking torque.
Separation time t2(attraction time)
(release)
The time from power switch-on to achieving 10 % of the stated braking torque. At
this point, the brake is almost free.

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 4 of 27 www.mayr.com, E-Mail: [e-mail]
your reliable partner
2 Safety
2.1 Safety and Guideline Signs
Symbol
Signal word
Meaning
DANGER
Designates a directly pending danger.
If not avoided, death or severe injuries will be the consequence.
WARNING
Designates a possibly hazardous situation.
If not avoided, death or severe injuries will be the consequence.
CAUTION
Designates a hazardous situation.
If not avoided, slight or minor injuries can be the consequence.
ATTENTION
Possible property damage can be the consequence.
Please Observe
Designates tips for application and other particularly useful information. Not
a signal word for dangerous or damaging situations.
2.2 General Guidelines
DANGER
Danger of death! Do not touch voltage-
carrying lines and components.
Brakes may generate further risks, among other things:
Hand
injuries
Danger of
seizure
Contact with
hot surfaces
Magnetic
fields
Severe injury to people and damage to objects may
result if:
the electromagnetic brake is used incorrectly.
the electromagnetic brake is modified.
the relevant standards for safety and / or installation
conditions are ignored.
2.2.1 Personnel Requirements
To prevent injury or damage, only professionals and
specialists are allowed to work on the components.
They must be familiar with the dimensioning, transport,
installation, initial operation, maintenance and disposal
according to the relevant standards and regulations.
Before product installation and initial oper-
ation, please read the Installation and Op-
erational Instructions carefully and ob-
serve the Safety Regulations. Incorrect
operation can cause injury or damage.
Technical data and specifications (Type tags and
documentation) must be followed.
The correct connection voltage must be connected
according to the Type tag and wiring guidelines.
Check electrical components for signs of damage be-
fore putting them into operation. Never bring them
into contact with water or other fluids.
Please observe the EN 60204-1 requirements for
electrical connection when using in machines.
Only carry out installation, maintenance
and repairs when the brake is in a de-en-
ergised, disengaged condition and se-
cure the system against inadvertent
switch-on (acc. EN 50110).
General Guideline:
During the risk assessment required when designing the
machine or system, the dangers involved must be evalu-
ated and removed by taking appropriate protective
measures in accordance with the Machinery Directive
2006/42/EC.
Brakes for safety-related applications are to be installed
singly or as redundant devices in accordance with the re-
quired category, in order to fulfil the required Perfor-
mance Level (PLr) acc. EN ISO 13849. This is in principle
the task of the system manufacturer.

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 5 of 27 www.mayr.com, E-Mail: [e-mail]
your reliable partner
2.3 Intended Use
mayr ®-brakes have been developed, manufactured and
tested in compliance with the DIN VDE 0580 standard
and in accordance with the EU Low Voltage Directive as
electromagnetic components. During installation, opera-
tion and maintenance of the product, the requirements for
the standard must be observed.
mayr®-brakes are for use in machines and systems and
must only be used in the situations for which they are or-
dered and confirmed. Using them for any other purpose is
not allowed.
2.4 Handling
Before installation, the brake must be inspected and
found to be in proper condition (visual inspection). The
following are not considered as being representative of a
proper condition:
External damage
External oiling
External contamination
The brake function must be inspected both once attach-
ment has taken place as well as after longer system
downtimes, in order to prevent the drive starting up
against possibly seized linings.
2.5 User-implemented Protective Measures
Brakes with a nominal voltage ≤ 50 V (VDE 0580)
must only be connected to a current source in accord-
ance with IEC 60364-4-41 Extra-Low Voltage SELV /
PELV.
Please cover moving parts to protect against injury
through seizure.
Place a cover on the magnetic part to protect against
injury through high temperatures.
Protection circuit: When using DC-side switching,
the coil must be protected by a suitable protection cir-
cuit according to VDE 0580, which is integrated in
mayr ®-rectifiers. To protect the switching contact from
consumption when using DC-side switching, addi-
tional protective measures are necessary (e.g. series
connection of switching contacts). The switching con-
tacts used should have a minimum contact opening of
3 mm and should be suitable for inductive load switch-
ing. Please make sure on selection that the rated volt-
age and the rated operating current are sufficient. De-
pending on the application, the switching contact can
also be protected by other protection circuits (e.g.
mayr®-spark quenching unit, half-wave and bridge
rectifiers), although this may of course then alter the
switching times.
Take precautions against freeze-up of the fric-
tion surfaces in high humidity and at low temper-
atures.
2.6 Dimensioning Other Machine Elements
The effects of the maximum and mini-
mum braking torque on the other ma-
chine components must be observed in
order to provide sufficient dimensioning.
If other brakes are positioned in the drive
line, and if the braking times of the differ-
ent brakes overlap, the loads will add up.

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 6 of 27 www.mayr.com, E-Mail: [e-mail]
your reliable partner
3 Legal Provisions
3.1 Directives, Standards and Regulations
Used
(also to be observed during installation and operation)
DIN VDE 0580
Electromagnetic devices
and components, general
specifications
2014/35/EU
Low voltage directive (only
for voltages > 75V)
2011/65/EU
RoHS II - Directive
2015/863/EU
RoHS III - Directive
UL 508 (Edition 17)
Industrial Control Equip-
ment
EN ISO 12100
Safety of machinery - Gen-
eral principles for design -
Risk assessment and risk
reduction
DIN EN 61000-6-4
Interference emission
EN ISO 13849-2
Safety of machinery
Safety related parts of con-
trol systems - Validation
3.2 Liability
The information, guidelines and technical data in these
documents were up to date at the time of printing. De-
mands on previously delivered brakes are not valid. Liabil-
ity for damage and operational malfunctions will not be
taken if:
the Installation and Operational Instructions are
ignored or neglected.
the brakes are used inappropriately.
the brakes are modified.
the brakes are worked on unprofessionally.
the brakes are handled or operated incorrectly.
3.3 Guarantee
The guarantee conditions correspond with the
Chr. Mayr GmbH + Co. KG sales and delivery
conditions (www.mayr.com Service General
Terms and Conditions)
Mistakes or deficiencies are to be reported to
mayr®power transmission at once!

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 7 of 27 www.mayr.com, E-Mail: [e-mail]
your reliable partner
3.4 Guidelines on CE Identification
Guidelines on the Declaration of Conformity
A conformity evaluation has been carried out for the product (electromagnetic safety brake) in terms of the
EU Low Voltage Directive 2014/35/EU and the RoHS 2011/65/EU with 2015/863/EU. The Declaration of
Conformity is laid out in writing in a separate document and can be requested if required.
Guidelines on the EMC Directive 2014/30/EU
The product cannot be operated independently according to the EMC Directive.
Due to their passive state, brakes are also non-critical equipment according to the EMC.
Only after integration of the product into an overall system can this be evaluated in terms of the EMC.
For electronic equipment, the evaluation has been verified for the individual product in laboratory conditions,
but not in the overall system.
Guidelines on the Machinery Directive 2006/42/EC
The product is a component for installation into machines according to the Machinery Directive 2006/42/EC.
The brakes can fulfil the specifications for safety-related applications in coordination with other elements.
The type and scope of the required measures result from the machine risk analysis. The brake then be-
comes a machine component and the machine manufacturer assesses the conformity of the safety device to
the directive.
It is forbidden to start initial operation of the product until you have ensured that the machine accords with
the regulations stated in the directive.
Guidelines on the EU Directive 2011/65/EU (RoHS II) with 2015/863/EU (RoHS III –from 22 July 2019)
These restrict the use of certain hazardous substances in electrical and electronic devices as well as in
products / components (category 11), the proper operation of which is dependent on electric currents and
electromagnetic fields. Our electromagnetic products / components fulfill the requirements laid down
in the RoHS Directive(s), taking into account the valid exceptions (according to Appendix III and IV
RoHS (2011/65/EU) with delegated Directives (EU) 2018/739-741 from 01.03.2018 for Category 11 –
until 21 July 2024) and comply with the RoHS.
Guidelines on the ATEX Directive
Without a conformity evaluation, this product is not suitable for use in areas where there is a high danger of
explosion.
For application of this product in areas where there is a high danger of explosion, it must be classified and
marked according to Directive 2014/34/EU.
Guidelines on the REACH Regulation (EC) No. 1907/2006
of the European Parliament and of the Council concerning the Registration, Evaluation, Authorization and
Restriction of Chemicals (REACH). This regulation governs the manufacture, placing on the market and use
of chemical substances in preparations and, under certain conditions, also of substances in finished prod-
ucts.
mayr®power transmission exclusively manufactures products (articles: overload clutches, shaft couplings,
electromagnetic brakes / clutches, permanent magnet motors and the appropriate control modules / rectifi-
ers) in accordance with the definition in Article 3 of the REACH Regulation.
mayr®power transmission is aware of its responsibility towards the environment and society. As a matter of
precaution, we pay attention to particularly critical substances in the supply chain and strive to avoid using
any such substances completely or to replace them in the near future.
In compliance with Article 33 of the REACH Regulation, we would like to inform you that in our overload
clutches and shaft couplings, electromagnetic brakes / clutches as well as permanent magnet motors, sub-
components with a lead content of > 0.1% are or may be used. These are manufactured from raw materials
such as machining steel / copper alloys (e.g. brass, bronze) or aluminum alloys.
Besides high-melting-point (HMP) solders (electronics), this also affects integrated machine elements as
well as standard parts (screws / nuts / set screws / pins / etc.) among others, provided that the relevant
standards allow this.
For example, lead can occur as an alloying element with more than 0.1 mass percent, based on the respec-
tive total mass, in screws and set screws of the following property classes: 4.6, 4.8, 5.8, 6.8, 04, 4, 5, 6, 14H,
17H, 22H, 33H, 45H.
Products made from copper and copper alloys do not fall within the area of applicability of Regulation (EC)
No. 1272/2008 of the European Parliament and Council on the Classification, Labeling and Packaging of
Substances and Mixtures (CLP Regulation) and are therefore not subject to the classification and labeling
obligations.
To our knowledge, when used for their intended purpose and disposed of correctly (recycling), the contained
substances pose no threat to health or environment.
We would hereby like to point out that the proportion of lead used here is not prohibited according to the
REACH Regulation. It is merely necessary to declare the use of this substance.

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 8 of 27 www.mayr.com, E-Mail: [e-mail]
your reliable partner
3.5 CE Identification
according to the Low Voltage Directive 2014/35/EU (only for voltage > 75 V) and/or RoHS Di-
rective 2011/65/EU with 2015/863/EU.
3.6 Identification/ Type tag
mayr®components are clearly marked and described on the type tag:
Size/Type Serial number Article number Nominal power DataMatrix-Code
Nominal voltage Braking torque
Serial number
Year
Code
Year
Code
2000
A
2012
P
2001
B
2013
R
2002
C
2014
S
2003
D
2015
T
2004
E
2016
U
2005
F
2017
V
2006
H
2018
W
2007
J
2019
X
2008
K
2020
Y
2009
L
2021
Z
2010
M
2022
G
2011
N
2023
Q

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 9 of 27 www.mayr.com, E-Mail: [e-mail]
your reliable partner
4 Product Description
4.1 Scope of Delivery / State of Delivery
The brakes are manufacturer-assembled ready
for installation.
Please observe the Type tag.
Please check the scope of delivery as well as the
state of delivery immediately after receiving the
goods. mayr®power transmission will take no re-
sponsibility for belated complaints. Please report
transport damage immediately to the supplier.
Please report incomplete delivery and obvious
defects immediately to the manufacturer.
4.2 Function
4.2.1 Quiescent Current Principle
The function principle applied here accords with the appli-
cation of the energy-separation principle in accordance
with EN ISO 13849-2 Appendix A.2 “List of basic safety
principles”. The reliable condition is achieved through
separation of the energy source, and thus accords with
the required safety aspects, for example during power
failure or EMERGENCY STOP.
ROBA®-servostop®brakes are spring applied, electro-
magnetic safety brakes.
Spring applied function (brake):
In de-energized condition, thrust springs (3) press against
the armature disk (2). The rotor disk (6) with the friction
lining (4) is held between the armature disk (2) and the
flange plate (5) via frictional locking.
The brake is released electromagnetically.
Electromagnetic function (release):
Due to the magnetic force of the coil in the coil carrier (1),
the armature disk (2) is attracted against the spring pres-
sure to the coil carrier (1).
The brake is released and the rotor disk (6) with the fric-
tion lining (4) can rotate freely.
Safety brake function:
The ROBA®-servostop®applies the brakes reliably and
safely in the event of a power switch-off, a power failure,
or an emergency stop.

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 10 of 27 www.mayr.com, E-Mail: [email protected]
your reliable partner
4.3 Views
Information regarding the strand:
2x SPEC 44
Conductor cross-section: AWG 24 or 0.25 mm²
Strand diameter: Ø 1.02 mm
min. Bending radius 6 x Ø
Length: approx. 480+30 mm
Deviations from the standard strand are possible for special designs. If necessary, take into account the in-
formation on the drawing.
Air gap “a”
Air gap “a”
strands
Fig. 1: Type 8981.29001
Fig. 2: Type 8981.29101
strands

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 11 of 27 www.mayr.com, E-Mail: [email protected]
your reliable partner
4.4 Parts List
(Only use mayroriginal parts)
Item
Name
1
Coil carrier (assembly with coil)
2
Armature disk
3
Thrust spring (not depicted)
4
Friction lining
5
Flange plate
6
Rotor disk
7
Distance bushing
8
Cap screw (customer-side) DIN EN ISO 4762 –8.8
9
Countersunk screw
10
Type tag
11
Fixing screw (provided by the customer), property class 8.8
12
Cap screw (customer-side) DIN EN ISO 4762 –8.8

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 12 of 27 www.mayr.com, E-Mail: [email protected]
your reliable partner
5 Technical Data
5.1 Guidelines
5.1.1 Application Conditions
The catalogue values are guideline values
which have been determined in test facili-
ties. It may be necessary to carry out your
own tests for the intended application.
When dimensioning the brakes, please re-
member that installation situations, braking
torque fluctuations, permitted friction work,
bedding-in condition / conditioning of the
brake linings and wear as well as general
ambient conditions can all affect the given
values. These factors should therefore be
carefully assessed, and alignments made
accordingly.
Mounting dimensions and connection dimensions
must be adjusted according to the size of the
brake at the place of installation.
Use of the brake in extreme environmental condi-
tions or outdoors, directly exposed to the weather,
is not permitted.
The brakes are designed for a relative duty cycle
of 100 %.
The braking torque is dependent on the following
factors:
- Bedding-in condition of the friction linings (4)
- Ambient temperature
- Age of friction linings (4)
The brakes are only designed for dry running.
The torque is lost if the friction surfaces come into
contact with oil, grease, water or similar sub-
stances or any other foreign bodies.
The outer components have been provided with a
phosphated or a gas-nitrated surface manufac-
turer-side to form a basic corrosion protection.
5.1.2 Ambient temperature/Climate Conditions
The electromagnetic brake is suitable for applications
with an ambient temperature of between -20 °C and
+120 °C.
CAUTION
Reduction in braking torque possible
Condensation can form on the brake and
cause a loss in braking torque:
due to fast changes in temperature
at temperatures of around or under
freezing point
The user is responsible for taking appro-
priate countermeasures (e.g. forced con-
vection, heating, drain screw).
CAUTION
Brake malfunction possible
Condensation can form on the brake and
cause malfunctions:
at temperatures around or under
freezing point, the brake can freeze
over and not release any more.
The user is responsible for taking appro-
priate countermeasures (e.g. forced con-
vection, heating, drain screw).
The system function must be checked by the user after
longer downtimes.
At high temperatures and in high humidity
or with occurring dampness, the rotor disk
(6) can seize up to the armature disk or
the bearing shield / the flange plate after
longer downtimes.
5.1.3 Class of Insulation F (+155 °C)
The insulation components on the magnetic coils are
manufactured at least to class of insulation F (+155 °C).
5.1.4 Protection
(mechanical) IP20: Protection against fingers or similar-
sized objects, against medium-sized foreign bodies > 12
mm in diameter. No protection against water.
(electrical) IP54: Dust-proof and protected against con-
tact as well as against water spray from any direction.

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 13 of 27 www.mayr.com, E-Mail: [email protected]
your reliable partner
5.1.5 Noise Emissions
The brake is not noise-reduced. When the armature disk
is switched, the impact pulse from the armature disk onto
the coil carrier or the armature disk onto the rotor disk (6)
generates a switching noise which can reach approx. 90
dB(A). The brake is not suitable for use in noise-sensitive
applications.
5.1.6 Installation Position
The brake can be operated in any installation position.
5.1.7 Pre-requisites for Product Application
Compare the limit values stated in these Installation and
Operational Instructions with the actual application, e.g.
Braking torque
Braking distance
Masses
Temperatures etc.

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 14 of 27 www.mayr.com, E-Mail: [email protected]
your reliable partner
5.2 Technical Data
5.2.1 General
Technical Data
Size
40
50
60
70
80
90
100
Nominal braking torque 1) 2) 3) 4)
MN
[Nm]
0.31
0.5
1.4
2.7
4
6
9
Overexcitation voltage
UO
[VDC]
24
24
24
24
24
24
24
Holding voltage
UH
[VDC]
8
8
8
8
8
8
8
Coil power at overexcitation
voltage
PO
[W]
20.7
28.6
42.6
53.4
60.6
71.6
83.4
Coil power at holding voltage
PH
[W]
2.3
3.2
4.7
5.9
6.7
8.0
9.3
Coil nominal capacity
PN
Maximum speed
nmax
[rpm]
10500
8500
7000
6500
5500
5000
4500
Max. idle speed
[rpm]
10500
8500
7000
6500
5500
5000
4500
Weight
[kg]
0.11
0.17
0.26
0.43
0.52
0.67
0.81
Total mass moment of inertia
J
[10-6
kgm²]
0.746
3.122
6.132
13.727
25.609
35.992
57.081
Inspection dimension K1min
[mm]
0.25
0.3
0.3
0.4
0.4
0.4
0.4
Inspection dimension K2min
[mm]
0.25
0.3
0.3
0.4
0.4
0.4
0.4
Recommended min. radial distance of
magnetically conductive materials in
the area of the coil carrier (1) and the
armature disk (2)
[mm]
1.25
1.25
1.25
1.25
1.5
1.5
1.75
5.2.1.1 Explanations
1) Braking torque tolerance: + 75 %
2) Suitable for a temperature of 0 up to 60 °C: For higher temperatures, please consider the following braking torque
reductions:
>60 °C to 80 °C: 10 % reduction
>80 °C to 100 °C: 20 % reduction
>100 °C to 120 °C: 30 % reduction
For temperatures of -20 to 0 °C:
Observe the “Ambient temperature/Climate conditions” section 5.1.2 in the operational instructions!
3) The braking torque values are based on friction values determined in tests at mayr®power transmission. As a friction
system is influenced by many parameters, such as mounting situation, temperature, ambient conditions, run-in condition,
wear, switching work, sliding speed, aging, contamination, etc., deviating braking torques are possible. The specified
nominal braking torque is a lower limit which is very likely to be reached, but cannot be guaranteed due to the many
possible influences. The fluctuations in braking torques must be taken into account during dimensioning by providing
appropriate safety measures. Specially for critical applications, it is important to consult mayr®power transmission and
carry out an appropriate application check.
4) Remarks and recommendations regarding the dimensioning and selection of brakes (e.g., based on load torque and
test torque):
See the document “Hinweise und Empfehlungen zum statischen Bremsentest”
(Remarks and suggestions regarding static brake tests) on our website under
ROBA®-servostop “Downloads”.

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 15 of 27 www.mayr.com, E-Mail: [email protected]
your reliable partner
5.2.2 Tightening torques
Size
40
50
60
70
80
90
100
Screw thread Item 8
M2
M2
M2,5
M3
M3
M4
M4
Screw tightening torque Item 8
[Nm]
0.32
0.32
0.65
1.1
1.1
2.6
2.6
Screw thread Item 11
M2,5
M2,5
M3
M4
M4
M5
M5
Screw tightening torque Item 11
[Nm]
0.65
0.65
1.1
2.6
2.6
5.1
5.1
Screw thread Item 12
M1.6
M2
M2
M2
M3
M3
M3
Screw tightening torque Item 12
[Nm]
0.15
0.32
0.32
0.32
1.1
1.1
1.1
5.2.3 Friction work
Friction work Cobot
40
50
60
70
80
90
100
max. friction work on in-
dividual switching
(1…10 switchings in a
succession)
[J]
25
50
80
175
200
250
350
Dynamic braking torque restrictions (Mdyn-min) in the speed range
Mdyn-min = MN
n
[rpm]
0 - 5000
0 - 4000
0 - 3500
0 - 3000
0 - 2500
0 - 2500
0 - 2000
Mdyn-min = MN-15 %
n
[rpm]
5000 - 8000
4000 - 6000
3500 - 5000
3000 - 4500
2500 - 4000
2500 - 3500
2000 - 3500
Mdyn-min = MN-30 %
n
[rpm]
8000 - 10500
6000 - 8500
5000 - 7000
4500 - 6500
4000 - 5500
3500 - 5000
3500 - 4500
Wear restriction (max. number of individual braking actions at max. friction work in the speed range)
1000
n
[rpm]
0 - 5000
0 - 4000
0 - 3500
0 - 3000
0 - 2500
0 - 2500
0 - 2000
700
n
[rpm]
5000 - 8000
4000 - 6000
3500 - 5000
3000 - 4500
2500 - 4000
2500 - 3500
2000 - 3500
500
n
[rpm]
8000 - 10500
6000 - 8500
5000 - 7000
4500 - 6500
4000 - 5500
3500 - 5000
3500 - 4500

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 16 of 27 www.mayr.com, E-Mail: [email protected]
your reliable partner
5.2.4 Dimensions
Dimensions [mm]
Size
40
50
60
70
80
90
100
a
0.15
0.15
0.15
0.2
0.2
0.2
0.2
d
22.5
33.5
40.5
40.5
48.5
56
63
d1 +0.1
13
22
29
29
33
40
47
D
43
53
62
70
80
90
100
G
22.5
33.5
40.5
40.5
50
57
67
H
48
58
68
78
88
98
108
L
13.35
16.35
18.35
20.9
20.9
21.9
22.4
l
0.6
1
1
1.5
1.5
1.5
1.5
l1
8.5
10
11
11.5
11.5
11.5
12
l2
10.8 ±0.1
12.85 ±0.1
14.35 ±0.1
15.65 ±0.2
15.65 ±0.2
16.15 ±0.2
16.65 ±0.2
M
17
27
34
34
40
47
54
s
2.4
2.4
2.9
3.4
3.4
4.5
4.5
s1
M2,5
M2,5
M3
M4
M4
M5
M5
Max. Screw-in depth for
thread s1(Item 11)
7.5
7.5
9
8
8
10
10
s2
1.8
2.4
2.4
2.4
3.4
3.4
3.4
X
25º
25º
25º
25º
25º
25º
25º
Y
90º (4x)
90º (4x)
60º (6x)
36º (10x)
60º (6x)
45º (8x)
36º (10x)
strands
Installation
dimension

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 17 of 27 www.mayr.com, E-Mail: [email protected]
your reliable partner
5.2.5 Switching Times
Diagram 1
Switching times for brake operation with overexcitation voltage
Key
MBr = Braking torque ML= Load torque
t1= Connection time t11 = Response delay on connection
t2= Separation time
tO= Overexcitation time UN= Coil nominal voltage/coil voltage
UH= Holding voltage UO= Overexcitation voltage
(These values are mean values referring to a nominal air gap „a“ on a cold brake)
Switching Times
Size
40
50
60
70
80
90
100
Connection time
DC-side switching
t1
[ms]
15
15
15
20
20
30
30
AC-side switching
t1
[ms]
65
65
65
80
90
150
150
Response delay on
connection
DC-side switching
t11
[ms]
10
10
10
15
15
20
20
AC-side switching
t11
[ms]
50
50
50
60
60
100
100
Separation time (release)
t2
[ms]
25
25
35
50
70
70
70
Overexcitation time
tO
[ms]
50
50
70
100
140
140
140
UO
MBr
0,1 x MBr
ML
t11
t1t2
tO
U
M
t
t
UH

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 18 of 27 www.mayr.com, E-Mail: [email protected]
your reliable partner
6 Intended Use
See also section 2.3
6.1 Guidelines for Application
Only for use as holding brake with a limited num-
ber of EMERGENCY STOP braking actions. Not
suitable for cyclic STOP braking actions in cycle
operation.
Please observe the correct dimensioning of
speed, braking torque, friction work and switching
frequency in case of EMERGENCY STOP for
safe holding of the load torque and safe compli-
ance of the required braking distance and over-
travel time.
The stated switching times can only be achieved
using the respective correct electrical wiring. This
also refers to the protection circuit for brake con-
trol and the response delay times of all control
components.
The brake is designed for 120 °C. Temperatures
above 120 °C in machine use can reduce the
magnetic force. Brake does not release properly.
Application in clean environments (penetration of
coarse-grained dust and liquids such as oils can
have a negative effect on the braking function).
Application in enclosed buildings
(In tropical regions, in high humidity with long
downtimes and sea climates only after taking spe-
cial measures).
Please contact mayr® power transmission.
Brakes which are to be used in safety-re-
lated applications must be selected, di-
mensioned and positioned according to the
risk assessment DIN EN 12100 and other
standards and regulations applicable to the
special application. This is in principle the
task of the system manufacturer/user.
6.2 Limits
The brake is not suitable for use in oily or se-
verely contaminated environments
6.3 Reasonably Foreseeable Misuse
The following uses are prohibited and may generate haz-
ards.
Any opening of the screws on the housing.
The maximum switching frequency is exceeded
Brake is used in oily or heavily contaminated sur-
roundings
The overexcitation time, see Chapter 5.2.5, is ex-
ceeded or undercut.
No overexcitation
6.4 Duration of Use
20 years or on reaching the T10d (for definition, see EN
ISO 13849-1) duration of use.
6.5 Dimensioning
Attention!
When dimensioning the brake, please take into consider-
ation whether a load torque is present when selecting the
protection.
Load torques reduce the deceleration torque availa-
ble.
Load torques may increase the output speed:
during a possible processing time in the
controls
during the brake downtime
When calculating the friction work, please observe that
the brake nominal torque is subject to a tolerance.

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 19 of 27 www.mayr.com, E-Mail: [email protected]
your reliable partner
7 Electrical Connection and Wiring
DC current is necessary for operation of the brake. The
coil nominal voltage is indicated on the Type tag as well
as on the brake body and is designed according to the
DIN IEC 60038 (± 10 % tolerance). Operation can take
place with a suitable DC power supply The connection
possibilities can vary dependent on the brake equipment.
Please follow the exact connections according to the sec-
tion 9.4. The manufacturer and the user must observe the
applicable regulations and standards (e.g. DIN EN
60204-1 and DIN VDE 0580). Their observance must be
guaranteed and double-checked!
7.1 Grounding Connection
Depending on the nominal voltage and/or identification in
the technical documents, the brake is designed for
Protection Class I or Protection Class III. In accordance
with VDE 0580 Item 4.6, the grounding connection can be
made directly or indirectly on the magnetic coil body.
Protection Class I:
This protection covers not only the basic insulation, but
also the connection of all conductive parts to the protec-
tive conductor (PE) on the fixed installation. If the basic
insulation fails, no contact voltage will remain. Please
carry out a standardised inspection of the protective con-
ductor connections to all contactable metal parts!
The grounding contact acts as a protective ground.
Protection class III:
The brake’s supply and thus protection against electric
shock takes place via the Safety Extra Low Voltage
PELV/SELV (see EN61140 Items 6.7-6.8 and 7.5) The
requirements of the machine and device standards (for
example, IEC 60204-1 or similar) must be observed.
The grounding contact acts as the functional ground and
serves to prevent electromagnetic disturbance or poten-
tial equalization, for example.
7.2 Fuse Element
To protect against damage from short circuits, please add
suitable fuse elements to the mains cable/supply line.
7.3 Switching Behavior
The reliable operational behavior of a brake is to a large
extent dependent on the switching mode used. Further-
more, the switching times are influenced by the tempera-
ture and the air gap between the armature disk and the
coil carrier (dependent on the wear condition of the lin-
ings).
7.4 Switching Modes
The separation time (t2) and the connection time (t1) of
the brake are substantially influenced depending on the
electrical wiring of the magnetic coil (see section 5.2.5).
7.4.1.1Field build-up with normal excitation
Determination of the separation time (t2).
If the magnetic coil is energised with coil nominal voltage,
the coil current does not immediately reach its nominal
value. The coil inductivity causes the current to increase
slowly as an exponential function. Accordingly, the build-
up of the magnetic field takes place more slowly and the
braking torque drop (see Diagram 3/curve 1) is also de-
layed.
For this type of wiring, no electrical construction elements
are required as long as the DC supply voltage equals the
coil nominal voltage on the magnetic coil.
7.4.1.2Field Build-up with Overexcitation
Quicker Release
Determination of the separation time (t2)
A quicker drop in braking torque is achieved if the coil is
temporarily placed under a higher voltage than the coil
nominal voltage, as the current then increases more
quickly. Once the brake is released, it needs to be
switched over to the coil nominal voltage UN(see
Diagram 3/curve 2). The relationship between
overexcitation and separation time t2is roughly indirectly
proportional, meaning that at doubled coil nominal
voltage the separation time t2for release of the brake is
halved. For this, further wiring modules are required. The
ROBA®-switch 24V and ROBA®-brake-checker work on
this principle.
Increased spring force
Generally, overexcitation of the magnetic coil is also re-
quired if the brake has an increased braking torque, and
an increased magnetic force is required to attract the ar-
mature disk against the increased spring forces.
Current path Braking torque path
Diagram 3
Operation with overexcitation requires an inspection of:
the required overexcitation time
the RMS coil capacity with a cycle frequency
higher than 1 cycle per minute.
MBr
IO
IN

Operational Instructions for
ROBA®-servostop®Type 8981.29_01
Sizes 40 - 100 (B.8981.EN)
06/10/2022 GF Chr. Mayr GmbH + Co. KG
Eichenstraße 1, D-87665 Mauerstetten
Phone: [phone], Fax: [phone]
Page 20 of 27 www.mayr.com, E-Mail: [email protected]
your reliable partner
7.4.1.3Calculation during Field Build-up with Overex-
citation
Required overexcitation time
Increased wear, and therefore an increasing air gap as
well as coil heating lengthen the separation times t2for
the brake. For this reason, at least 2 to 2.5 times the sep-
aration time t2at nominal current INmust be selected as
overexcitation time tO.
RMS coil capacity P
P PN
The coil capacity P must not be larger
than PN. Otherwise the coil may fail due
to thermal overload.
Key and Calculations:
P
[W]
RMS coil capacity dependent on switch-
ing frequency, overexcitation, reduction in
capacity and duty cycle
P = P
O× tO+ P H× tH
T
PN
[W]
Coil nominal capacity (Technical Data,
type tag)
PO
[W]
Coil power on overexcitation (Technical
Data)
PH
[W]
Coil power on holding voltage (Technical
Data, type tag)
tO
[s]
Overexcitation time
tH
[s]
Holding time
ton
[s]
Time with voltage
toff
[s]
Time without voltage
T
[s]
Total time (tO+ tH+ toff)
UO
[V]
Overexcitation voltage (bridge voltage)
UH
[V]
Holding voltage (half-wave voltage)
UN
[V]
Coil nominal voltage
IO
[A]
Overexcitation current
IN
[A]
Nominal current
MBr
[Nm]
Braking torque
7.4.1.4Time Diagram:
7.4.2 Magnetic Field Removal
Determination of the connection time (t1)
7.4.2.1 Switching with Freewheeling Diode
Supply with DC voltage
The power circuit is interrupted in front of the freewheel-
ing diode. The magnetic field slowly reduces. This delays
the rise in braking torque and generates a slow connec-
tion time t1. The freewheeling diode is to be dimensioned
in accordance with the nominal current of the brake and
the maximum occurring supply voltage with the appropri-
ate safety factor.
Recommendation!
Connection time t1is of no consequence:
switch with the freewheeling diode.
No protective measures for the coil
and switching contacts required.
Switching with freewheeling diode means a longer brake
engagement time (approx. 6 –10 times longer than with
DC-side switch-off), use for non-critical braking times.
L+
L-
Schematic wiring diagram 1
0
U
t
UO
U=
H UN
T
toff
ton
tO tOtH