Dangerous voltage!
The safety function “Safe Torque Off” may only be used if mechanical work is to be
performed on the driven machines, not for work on live components.
After disconnection of an external DC 24 V power supply, the DC link of the frequency
inverter is still connected to mains supply.
Even if power supply to the motor is disconnected, and the motor is coasting to a standstill
or has already stopped, high voltages may still be present on the motor terminals.
Before working (e. g. maintenance) on live parts, the plant must always be disconnected
from mains supply (main switch). This must be documented on the plant.
When the function “Safe Torque Off” is triggered, the motor is not isolated from the DC
link of the frequency inverter. High voltage levels may be present at the motor.
Do not touch live terminals.
The application manual "Safe Torque Off STO" must be complied with, particularly if the
safety function described there is used.
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