Rockwell Automation 25B PowerFlex 520-Series Adjustable Frequency AC Drive User Manual - Manual (Page 228)

228 Rockwell Automation Publication 520-UM001G-EN-E - September 2014
Appendix G Safe-Torque-Off Function
Under normal drive operation, both safety inputs (Safety 1 and Safety 2) are
energized, and the drive is able to run. If either input is de-energized, the gate
control circuit becomes disabled. To meet EN ISO 13849 operation, both safety
channels must be de-energized. Refer to the following examples for more
information.
Verify Operation Test the safety function for proper operation after the initial setup of the
PowerFlex 525 Safe-Torque-Off function. Retest the safety function at the
intervals determined by the safety analysis described on
page 224 .
Verify that both safety channels are functioning according to the table below.
IMPORTANT By itself, the Safe-Torque-Off function initiates a coast to stop action.
Additional protective measures will need to be applied when an application
requires a change to the stop action.
Channel Operation and Verification
Safety Function
Status Drive In
Safe State Drive In
Safe State Drive In
Safe State Drive
Able To Run
Drive Status Configured by t105
[Safety Open En] Fault F111
(Safety Hardware) Fault F111
(Safety Hardware) Ready/Run
Safety Channel Operation
Safety Input S1 No Power Applied Power Applied No Power Applied Power Applied
Safety Input S2 No Power Applied No Power Applied Power Applied Power Applied
IMPORTANT If an external fault is present on the wiring or circuitry controlling the Safety 1
or Safety 2 inputs for a period of time, the Safe-Torque-Off function may not
detect this condition. When the external fault condition is removed the Safe-
Torque-Off function will allow an enable condition. Fault in the external wiring
shall either be detected by external logic, or excluded (wiring must be
protected by cable ducting or armoring), according to EN ISO 13849-2.