Rockwell Automation iTRAK, User Manual

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Rockwell Automation Publication 2198T-UM002C-EN-P - March 2019 111
Chapter
7
Functional Safety
The iTRAK® components do not have Safe Torque Off or any other features
that are described in EN 61800-5-2. When combined into a system,
implement safety functions to prevent motor actuation. Remove the AC power
by using similar methods that are used for variable frequency drives that do not
have Safe Torque Off. The safety function subsystem that is described here
explains how to wire contactors for the successful removal of power to the
iTRAK system.
Important Safety
Considerations You are responsible for the following.
• Validation of any sensors or actuators that are connected to the system.
• Completing a machine-level risk assessment.
• Certification of the machine to the desired EN ISO 13849 performance
level or IEC 62061 SIL level.
• Project management and proof tests in accordance with EN ISO 13849
or IEC 62061.
Category 3 Requirements
according to EN ISO 13849-1 Safety-related parts are designed with these attributes.
• One fault in any of these parts of the control system does not lead to the
loss of the safety function.
• One fault is detected whenever reasonably practicable.
• Accumulation of undetected faults can lead to the loss of the safety
function and a failure to remove power that produces motion from the
motor.
Topic Page
Important Safety Considerations 111
Category 3 Requirements according to EN ISO 13849-1 111
Stop Category Definition 112
Performance Level and Safety Integrity Level (SIL) 112
Safety Distance Calculations 112
Functional Safety Description 112
Considerations for Category 1 Stop 113
Overall System Stopping Performance 113
Schematic and Block Diagrams 114