Rockwell Automation Publication 750-UM002H-EN-P - February 2017 9
Chapter 1
Safety Concept
This chapter describes the safety performance level concept and how the
PowerFlex® 750-Series Safe Torque Off option module meets the requirements
for SIL CL3, CAT. 3, or PLe applications.
Certification
The PowerFlex 750-Series Safe Torque Off option module is certified for use in
safety applications up to and including SIL 3 according to EN 61800-5-2, IEC
61508, and EN 62061, Performance Level PLe and Category 3 according to
EN ISO 13849-1. Safety requirements are based on the standards current at
the time of certification.
The TÜV Rheinland group has approved the PowerFlex 750-Series Safe
Torque Off option module for use in safety-related applications where the de-
energized state is considered to be the safe state. All of the examples in this
manual are based on achieving de-energization as the safe state for typical
Machine Safety and Emergency Shutdown (ESD) systems.
Topic Page
Certification 9
Functional Proof Tests 11
PFD and PFH Definitions 12
PFD and PFH Data 12
Safe State 13
Safety Reaction Time 13
Considerations for Safety Ratings 14
Contact Information if Safety Option Failure Occurs 14
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