200 Appendix: Safe Torque Off (STO)
Start-up, acceptance, and proof test interval checklist
Action
Ensure that the drive can be run and stopped freely during the commissioning.
Stop the drive (if running), switch off the input power and isolate the drive from the
power line by a disconnector.
Check the STO circuit connections against the circuit diagram.
Check that the shield of the STO input cable is grounded to the drive frame.
Close the disconnector and switch on the power.
Test the operation of the STO function when the motor is stopped:
• Disable the drive and ensure the motor shaft is not rotating.
• Activate the STO function (remove power from the STO inputs) and attempt to
enab
le the drive.
• Ensure that the drive can not be enabled (see section Operation of the STO
function and diagnostics on page 195.)
• Deactivate the STO function (apply power to the STO inputs).
Test the operation of the STO function when the motor is running:
• Deactivate the STO circuit (apply power
to the STO inputs).
Document and sign the acceptance test report which verifies that the safety function is
safe and accepted to operation.
• Enable the drive and start motion. Ensure the motor is rotating.
•
Activate the STO function (remove power from the STO inputs).
• Ensure that the drive disables and the motor stops rotating.
• Attempt to enable the drive.
• Ensure that the drive can not be enabled (see section Operation of the STO
function and diagnostics on page 195.)
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