Hardware Manual

236 Safe Torque off function
documentation..
Action
WARNING! Obey the Safety instructions, page 13. Ignoring the instructions
can cause physical injury or death, or damage to the equipment.
Ensure that the drive can be run and stopped freely during start-up.
Stop the drive (if running), switch the input power off and isolate the drive from the
power line by a disconnector.
Check the Safe torque off (STO) circuit connections against the circuit diagram.
Close the disconnector and switch the power on.
Test the operation of the STO function when the motor is stopped.
• Give a stop command for the drive (if running) and wait until the motor shaft is at a
standstill.
Make sure that the drive operates as follows:
• Open the STO circuit. The drive generates an indication if one is defined for
‘stopped’ state in parameter 31.22 (see the firmware manual).
• Give a start command to verify that the STO function blocks the drive operations.
The motor should not start.
• Close the STO circuit.
• Reset any active faults. Restart the drive and check that the motor runs normally.
Test the operation of the STO function when the motor is running:
• Start the drive and make sure the motor is running.
• Open the STO circuit. The motor should stop. The drive generates an indication if
one is defined for ‘running’ state in parameter 31.22 (see the firmware manual).
• Reset any active faults and try to start the drive.
• Make sure that the motor stays at standstill and the drive operates as described
above in testing the operation when the motor is stopped.
• Close the STO circuit.
• Reset any active faults. Restart the drive and check that the motor runs normally.
Document and sign the acceptance test report which verifies that the safety function is
safe and accepted for operation.