ABB ACS355 series, User Manual

Page: 423 / 436

Appendix: Safe torque off (STO) 423
failure reports and resolution of failures. You must store any new acceptance tests
performed due to changes or maintenance in the logbook of the machine.

Acceptance test procedure
After wiring the Safe torque off function, validate its operation as follows.
Action
WARNING! Follow the instructions in chapter Safety , page 17 . 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 circuit connections against the wiring 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.
Ensure that the drive operates as follows:
• Open the STO circuit. The drive generates an indication as defined in parameter
3025 STO OPERATION. For the description of the warning, see chapter Fault
tracing .
• Give a start command to verify that the STO function blocks the drive’s operation.
The drive displays a warning. 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 ensure the motor is running.
• Open the STO circuit. The motor should stop. The drive generates an indication if
one is defined for the ‘running’ state in parameter 3025 STO OPERATION. For the
description of the warning, see chapter
Fault tracing .
• Reset any active faults and try to start the drive.
• Ensure that the motor stays at a 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.