Rockwell Automation Publication 520-UM001K-EN-E - August 2021 237
Appendix G
Safe Torque Off Function
The PowerFlex 525 Safe-Torque-Off function, when used with other safety
components, helps provide protection according to EN ISO 13849 and EN62061
for safe-off and protection against restart. The PowerFlex 525 Safe-Torque-Off
function is just one component in a safety control system. Components in the
system must be chosen and applied appropriately to achieve the desired level
of operator safeguarding.
PowerFlex 525 Safe-
Torque-Off Overview
The PowerFlex 525 Safe-Torque-Off function:
• Provides the Safe-Torque-Off (STO) function defined in
EN 61800-5-2.
• Blocks gate-firing signals from reaching the Insulated Gate Bipolar
Transistor (IGBT) output devices of the drive. This prevents the IGBTs
from switching in the sequence necessary to generate torque in the
motor.
• Can be used in combination with other safety devices to fulfill the
requirements of a system “safe torque off” function which satisfies
Topic Page
PowerFlex 525 Safe-Torque-Off Overview 237
EC Type Examination Certification 238
EMC Instructions 238
Using PowerFlex 525 Safe-Torque-Off 239
Enabling PowerFlex 525 Safe-Torque-Off 241
Wiring 241
Verify Operation 242
PowerFlex 525 Safe-Torque-Off Operation 242
Connection Examples 243
PowerFlex 525 Certification for Safe-Torque-Off 246
IMPORTANT
The Safe-Torque-Off function covered in this chapter is specific to
PowerFlex 525 drives only.
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