5 STO Technical Data
NOTICE
For technical specifications and operating conditions for the frequency converter, refer to the relevant Operating
Instructions of the frequency converter.
NOTICE
The STO signal must be SELV or PELV supplied.
European Directives
Machinery Directive
(2006/42/EC)
EN ISO 13849-1
EN IEC 62061
EN IEC 61800-5-2
EMC Directive
(2004/108/EC)
EN 50011
EN 61000-6-3
EN 61800-3
Low Voltage
(2006/95/EC)
EN 50178
EN 61800-5-1
Safety
Standards
Safety of Machinery EN ISO 13849-1, IEC 62061, IEC 60204-1
Functional Safety IEC 61508-1 to -7, IEC 61800-5-2
Safety Function
IEC 61800-5-2 IEC 60204-1
Safe Torque Off (STO) Stop Category 0
Safety Performance
ISO 13849-1
Category Cat 3
Diagnostic
Coverage
DC: 90% (Medium)
Mean Time to Dangerous
Failure
MTTFd: 14000 years (High)
Performance Level PL d
IEC 61508 / IEC 62061
Safety Integrity Level SIL 2, SIL CL2
Probability of
Dangerous Failure
per Hour
PFH: 1E-10/h
(High Demand Mode)
Probability of
Dangerous Failure
on Demand
PFD: 1E-10
(Low Demand Mode)
Safe Failure Fraction SFF: > 99%
Hardware Fault Tolerance HFT: 0 (1oo1)
Proof Test Interval T1 20 Years
Mission time TM 20 Years
Reaction time Input to output response time Maximum 20 ms
Table 5.1 Technical Data
SISTEMA Data
Functional safety data are available from a data library for use with the SISTEMA calculation tool from the IFA (Institute for
Occupational Safety and Health of the German Social Accident Insurance), and data for manual calculation. SISTEMA is
available for download at www.danfoss.com/BusinessAreas/DrivesSolutions/SISTEMA/.
STO Technical Data
Operating Instructions
MG37D202 Danfoss A/S © 09/2014 All rights reserved. 11
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