Rockwell Automation 25B PowerFlex 520-Series Adjustable Frequency AC Drive User Manual - Manual (Page 225)

Rockwell Automation Publication 520-UM001G-EN-E - September 2014 225
Safe-Torque-Off Function Appendix G
A safety analysis of the machine section controlled by the drive is required to
determine how often the safety function should be tested for proper operation
during the life of the machine.
Safety Concept The PowerFlex 525 Safe-Torque-Off function is suitable for use in safety
applications up to and including Category 3 / PL(d) according to
EN ISO 13849-1 and SIL 2 according to EN 62061 / EN 61800-5-2 /
IEC 61508.
In addition, the PowerFlex 525 STO may be used together with other
components in a safety application to achieve an overall Category 3 / PL(e)
according to EN ISO 13849-1 and SIL 3 according to EN 62061 and
IEC 61508. This is illustrated in Example 3 in this appendix.
Safety requirements are based on the standards current at the time of
certification.
The PowerFlex 525 Safe-Torque-Off function is intended 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.
Important Safety Considerations
The system user is responsible for:
• the set-up, safety rating, and validation of any sensors or actuators
connected to the system.
• completing a system-level risk assessment and reassessing the system any
time a change is made.
• certification of the system to the desired safety performance level.
• project management and proof testing.
• programming the application software and the safety option
configurations in accordance with the information in this manual.
ATTENTION: The following information is merely a guide for proper
installation. Rockwell Automation cannot assume responsibility for the
compliance or the noncompliance to any code, national, local or otherwise for
the proper installation of this equipment. A hazard of personal injury and/or
equipment damage exists if codes are ignored during installation.
ATTENTION: In safe-off mode, hazardous voltages may still be present at the
motor. To avoid an electric shock hazard, disconnect power to the motor and
verify that the voltage is zero before performing any work on the motor.
ATTENTION: In the event of the failure of two output IGBTs in the drive, when
the PowerFlex 525 Safe-Torque-Off has controlled the drive outputs to the off
state, the drive may provide energy for up to 180
° of rotation in a 2-pole motor
before torque production in the motor ceases.