STO (Safe Torque Off according to EN 61800-5-2)

  • STO (safe torque off according to EN 61800-5-2) by disconnecting the STO input.
  • If the STO function is activated, the frequency inverter no longer supplies power to the motor for generating torque. This safety subfunction corresponds to a non-controlled stop according to EN 60204‑1, stop category 0.
  • The STO input must be disabled by a suitable external safety controller/safety relay.
  • The following figure shows the STO function:

v

Velocity

t

Time

t1

Point of time when STO is triggered

Disconnection range