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N O T I C E
Carry out a risk assessment to select the correct stop category for each stop function in accordance with EN 60204-1.
When designing the machine application, consider timing and distance for coast to stop (Stop Category 0 or STO). See
EN 60204-1 for further information.
All signals connected to the STO must be supplied by a PELV supply.
8.3 Qualified Personnel for Working with Functional Safety
The STO function can only be installed, programmed, commissioned, maintained, and decommissioned by qualified personnel.
Qualified personnel for the functional safety concept are qualified electrical engineers, or persons who have received training from
qualified electrical engineers and are suitably experienced to operate devices, systems, plant, and machinery in accordance with the
general standards and guidelines for safety technology.
Furthermore, they must:
Be familiar with the basic regulations concerning health and safety/accident prevention.
Have read and understood the safety guidelines given in this manual.
Have a good knowledge of the generic and specialist standards applicable to the specific application.
Users of power drive systems (safety-related) (PDS(SR)) are responsible for:
Hazard and risk analysis of the application.
The overall safety of the application.
Identifying safety functions required and allocating SIL or PL to each of the functions, other subsystems, and the validity of sig-
nals and commands from them.
Designing appropriate safety-related control systems, such as hardware, software, and parameterization.
8.4 Applied Standards and Compliance
Use of the STO function requires that all provisions for safety, including relevant laws, regulations, and guidelines, are satisfied.
The integrated STO function complies with the following standards:
IEC 60204-1: 2016 Stop Category 0 – uncontrolled stop
EN 60204-1: 2018 Stop Category 0 – uncontrolled stop
IEC/EN 61508: 2010 SIL 2
IEC 61800-5-2: 2016 SIL 2
EN 61800-5-2: 2017 SIL 2
IEC 62061: 2005 and A1: 2012 and A2: 2015
EN 62061: 2005 and Cor.:2010 and A1: 2013 and A2: 2015
IEC/EN 62061: 2015 SIL CL2
EN ISO 13849-1: 2015 Category 3, PL d
EN ISO 13849-2: 2014
8.5 Abbreviations and Conventions
Table 34: Safety-related Abbreviations and Conventions
Abbrevia-
tion
Reference
Description
Cat.
EN ISO 13849-1
Category B, 1–4
DC
–
Diagnostic coverage
FIT
–
Failure in time
Failure rate: 1E-9/hour
HFT
EN IEC 61508
Hardware fault tolerance
AQ262449648484en-000101 / 175R1135
148 | Danfoss A/S © 2020.08
Functional Safety Concept
VLT® Servo Drive System ISD 510/DSD 510
Operating Guide
