F160 fault in WEG CFW900 Drive indicates an STO90 Fault. This means the Safe Torque Off circuit detected an anomaly, such as a channel discrepancy or hardware damage, forcing a secure trip.
Cause:
It indicates to the user that STO90 is in a fault state.
- Incorrect installation of the safety inputs circuit (STO1 and STO2).
- Actuation time between the safety inputs (STO1 and STO2) greater than 1 s.
- Incorrect setting of the safety input type (dry contact or OSSD) on DIP switches S1.
- DIP switches S2 activated in a state other than the STO state.
- Incorrect programming of the safety function or programming timeout (2 min).
- Damage in the electronic circuit of STO90.
Remedy:
Verify safety input circuits. Confirm STO1 and STO2 terminals are balanced and synchronized. Check DIP switches S1/S2 positions. Replace module if defective.
