Can STO be initiated via the communication protocols in the Altivar Process?
The STO cannot be initiated over communication protocol. The Altivar 630 has 2 STO (Safe Torque Off) inputs – SIL3.
STO is a drive integrated function that ensures by a complex hardware circuit that there is no torque on the motor.
They are certified Safe Torque Off inputs which ensure that the frequency converter can’t produce any torque on the motor.
STOA switches the upper part of the inverter bridge off and STOB switches the lower part of the inverter bridge off.