Rockwell Automation Publication 7000-UM202H-EN-P - November 2023 21
Chapter 1 PowerFlex 7000 Drive Overview
Functional Safety Safe Torque Off
Safe Torque Off is a functional safety feature that is integrated into the
PowerFlex 7000 drive, available for AFE and Direct-to-Drive configurations.
The drive can receive a safety input signal (for example, from an optical sensor
or a safety gate) and remove rotational power from the motor, allowing the
motor to coast to a stop. After the Safe Torque Off command is initiated, the
drive will declare that it is in the safe state. The drive itself remains powered
and the safe state is reliably monitored to help ensure no rotational torque can
be delivered to the motor. The drive can return rotational power to the motor
after the Safe Torque Off condition has been reset.
Figure 15 - Safe Torque Off
An internal safety relay provides for the safety input and reset circuits.
Safe Torque Off can be used in AFE and Direct-to-Drive rectifier drive
configurations for A, B, and C frames. Safe Torque Off cannot be used for
parallel drives, N+1, N-1, synchronous transfer and 18-pulse drive
configurations.
This feature is certified by TÜV for use in safety applications up to and
including Safety Integrity Level 3 (SIL3) and Category 3, Performance Level e
(Cat 3, PL e). More information on functional safety and SIL and PL ratings can
be found in the following standards:
•EN 61508
•EN 62061
•EN 61800-5-2
•EN 13849-1
See publication 7000-UM203
for more information that is related to the
functional safety option.
Speed
Motor Power
Stop Request
Stopping Time
Coast
Time
Time
To Next Page
Loading...
Need help?
General
