Cause : Auto tuning comes when parameter auto-tuning is processing or when running auto-tuning, the keypad displays “tUn”. This warning indicate that drive run auto tune process.

tUn warning in delta ms300 drive indicate drive Auto tuning means the motor parameter is running auto-tuning. When the auto-tuning is finished, the warning automatically clears.

• When auto-tuning is finished and no error occurs, the warning automatically clears.