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VLT® Servo Drive System ISD 511
Operating Guide
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Carry out a risk assessment to select the correct stop category for each stop function in accordance with EN 60204-1.
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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.
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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.
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The overall safety of the application.
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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 61508-1 to 2: 2010 SIL 2
•
EN 61508-1 to 2: 2010 SIL 2
•
IEC 61800-5-2: 2016 SIL 2
•
EN 61800-5-2: 2017 SIL 2
•
EN ISO 13849-1: 2015, PL d, Cat. 3
•
EN ISO 13849-2: 2012, PL d, Cat. 3
The ISD 511 can be used in the application area of EN IEC 62061:2021 and where Stop Category 0 (uncontrolled stop), according to
IEC 60204-1:2016 or EN 60204-1:2018, is needed.
8.5 Abbreviations and Conventions
Table 21: Safety-related Abbreviations and Conventions
Abbrevia-
Reference
tion
Cat.
EN ISO 13849-1
DC
–
FIT
–
HFT
EN IEC 61508
MTTF
EN ISO 13849-1
D
90 | Danfoss A/S © 2023.08
N O T I C E
Description
Category B, 1–4
Diagnostic coverage
Failure in time
Failure rate: 1E-9/hour
Hardware fault tolerance
HFT = n means that n + 1 faults may lead to a loss of the safety function.
Mean time to failure – dangerous
Safety Concept
AQ377148425069en-000101 / 130R1213
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