Safe torque off

What does 5091 mean?

The Safe Torque Off (STO) function has been activated, meaning the motor's torque production is safely disabled. This usually results from a break in the external safety circuit connected to the XSTO connector or a diagnostic fault setting, preventing the motor from starting or running.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   For more detailed information, consult the appropriate drive hardware manual and the description of parameter 31.22 (page 148).