A491 warning in ABB DCS880 drive indicates motor temperature 1 measured/estimated. This means Measured/Estimated motor temperature 1 has exceeded the warning level.

Check the following to correct the fault:
− The value of 35.02 Measured temperature 1.
− The real motor temperature. Let motor cool down and restart.
− The value of 35.13 Temperature 1 warning level.
− The cooling of the motor or other temperature measured equipment.
− The ambient conditions (e.g. ambient temperature).
− The airflow and fan operation.
− The motor fan supply voltage.
− The motor fan direction of rotation.
− The motor fan components.
− The motor cooling air inlet (e.g. filters).
− The motor cooling air outlet.
− The motor load and drive ratings.
− Inadmissible load cycle.
− The wiring of the temperature sensor