Cause : Safe motor temperature comes when you have configured a season which starts before the previous season.

The A991 warning code in your ABB ACS560 drive indicates an external temperature sensor fault. This means the drive is unable to receive a valid temperature reading from the external sensor connected to it.

1. Configure the seasons with increasing start dates.
2. See parameters 34.60 Season 1 start date…34.63 Season 4 start date.