A782 warning in ABB DCS880 drive indicates Measurement circuit FEN temperature issue. This means a problem with the temperature measurement when a FEN-xx is used.

1. Check that 35.11 Temperature 1 source and 35.21 Temperature 2 source setting corresponds to the actual installation connected to the encoder interface.
2. A non-supported KTY sensor is connected to the encoder interface FEN-01. Use either a PTC sensor or another encoder interface module.