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STO (Safe Torque OFF) function refers to the functional safety of the
machine, not to the electrical safety. STO guarantees that there will be
no torque on the motor, so the machine is not able to move. Therefore
the machine can not make any damage to persons or property. If you need
to make any maintenance to the motor/machine you will have to remove the
power supply to the machine (to the inverter) in order to ensure the
electrical safety.
The big advantage of STO function is that it can replace the contactors at the output of the inverter, thus giving the following advantages:
The big advantage of STO function is that it can replace the contactors at the output of the inverter, thus giving the following advantages:
- No wear of the contactors, with virtual unlimited number of stop/start operations
- Cheaper and easier installation, because you are saving the output contactors
- Better EMC behavior (there is a perfect continuity of the motor cable shield)
- No acoustic noise due to the contactors (in some applications like elevators acoustic noise is relevant)
Tags: Electrical safety