STO – Safe Torque Off according to IEC 61800‑5‑2

STO (Safe Torque Off in accordance with IEC 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 function 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		Speed
t		Time
t1		Point of time when STO is triggered
		Disconnection range