What Is The Integrated Safety - Safe Torque Off Option Module - Allen-Bradley PowerFlex 755 User Manual

What Is the Integrated
Safety - Safe Torque Off
Option Module?
Safety Concept
This chapter provides information on safety considerations for the Integrated
Safety - Safe Torque Off option module.
Topic
What Is the Integrated Safety - Safe Torque Off Option Module?
Compatible Drives
Compatible Safety Controllers
Safety Application Requirements
Safety Certification
Functional Proof Tests
PFD and PFH Definitions
PFD and PFH Data
Safety Reaction Time
Considerations for Safety Ratings
Contact Information If Safety Option Failure Occurs
The Integrated Safety - Safe Torque Off (STO) option module provides either
a hardwired or a networked STO function via an EtherNet/IP® network. See
Chapter 6 for detailed information on hardwired operation.
With networked Safe Torque Off, a GuardLogix® safety controller issues the
Safe Torque Off command over the EtherNet/IP network, and the PowerFlex®
drive executes the command. The Integrated Safety - Safe Torque Off option
module includes these features:
• Is designed to remove power from the gate firing circuits of the drive
output power devices (IGBTs). With the power removed, the drive
output power devices cannot turn on to generate AC power to the
motor.
• Can be used in combination with other safety devices to satisfy the
requirements of IEC 61508, IEC 61800-5-2 SIL 3, ISO 13849-1 PLe,
and Category 3 for Safe Torque Off (STO).
IMPORTANT The Integrated Safety - Safe Torque Off option module is suitable for
performing mechanical work on the drive train or affected area of a
machine only. It does not provide electrical safety.
Rockwell Automation Publication 750-UM004B-EN-P - October 2018
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