F161 fault in WEG CFW900 Drive indicates STO90 Off-line. This means the main control board has lost communication with the attached STO90 safety module.
Cause:
It indicates to the user that CFW900 central control has lost communication with STO90.
- Poor contact between STO90 and CFW900 central control.
- Damage in the electronic circuit of STO90 or CFW900 central control.
Remedy:
Check terminal contacts and board fitment. Verify central control unit circuit.
