ABB ACS880 User Manual page 17

Option description and instructions 17
Action
Drives with R8i inverter modules: Ensure that "STO hardware failure" (5090) is not generated.
Switch off the inverter start signals.
If a fault message is generated, reset the inverter units. See section POUS indications on page 18.
Restart the inverter units and motors and check that they operate normally.
Repeat the acceptance test for each POUS group.
Fill in and sign the acceptance test report which verifies that the safety function is safe and accepted
to operation.