Safe torque off

What does A5A0 mean?

The Safe Torque Off (STO) function is active, meaning the safety circuit signal(s) connected to the STO connector have been lost or removed. Depending on parameter 31.22, this can be a warning when STO is intentionally activated, or an indication of an unintended safety circuit issue. The drive will prevent motor rotation for safety.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Check the value of parameter 95.04 (Control board supply) to ensure stable power to the control board.

2. 4

   After resolving the cause, reset the drive from an appropriate source (e.g., control panel, digital input).