Allen-Bradley PowerFlex 527, User Manual

Page: 99 / 176

Rockwell Automation Publication 520-UM002B-EN-E - December 2017 99
Hardwired Control of Safe Torque-Off Chapter 5
System Operation in the Event that the Safety Enable Inputs Mismatch on
page 99
demonstrates when the safe torque-off mismatch is detected and a
GuardStopInputFault is posted.
System Operation in the Event that the Safety Enable Inputs Mismatch
When one safety input is turned off, the second input must also be turned off,
otherwise a fault is asserted (see
System Operation in the Event that the Safety
Enable Inputs Mismatch Momentarily on page 99 ). The fault is asserted even if
the first safety input is turned on again.
System Operation in the Event that the Safety Enable Inputs Mismatch Momentarily
ATTENTION: The safe torque-off fault is detected upon demand of the safe
torque-off function. After troubleshooting, a safety function must be executed
to verify correct operation.
IMPORTANT
The Safe Torque-Off fault can be reset only if both inputs are in the Off state for
more than 1 second. After the fault reset requirement is satisfied, an MASR
command in the Logix Designer application must be issued to reset the
GuardFault and GuardStopInputFault conditions.
(Safety Input) S1
1 second discrepancy limit
No Fault Faulted
No Fault Faulted
Start Inhibited
OK Not OK
Torque Disabled
Stop Requested
Start Permitted
Torque Permitted
(Safety Input) S2
GuardFault
SafeTorqueOffInhibit
GuardOKStatus
GuardGateDriveOutputStatus
GuardStopInputStatus
GuardStopRequestStatus
GuardStopInputFault
(Safety Input) S1
1 second
Start Inhibit
Torque Disabled
Torque Disabled
(Safety Input) S2
GuardFault
SafeTorqueOffInhibit
GuardOKStatus
GuardGateDriveOutputStatus
GuardStopInputStatus
GuardStopRequestStatus
GuardStopInputFault