tUN fault Emotron VSB Drive indicates Parameter identification failed. This means the drive could not successfully complete the auto-tuning process to determine the motor’s electrical characteristics.
Possible Causes:
1: Bad motor connection.
2: Identification during rotation of the motor.
3: Bias between motor parameters and their setting is too big.
Solutions:
1: Check motor connection.
2: Identification in stationary status of the motor.
3: Set the parameters correctly according to motor nameplate.