Cause : Idenfication fault comes when identification run has failed. Run command was removed before completion of identification run. Motor is not connected to frequency converter. There is load on motor shaft.

An "Identification Fault" in a motor drive system like the Danfoss Vacon 20 typically refers to a problem related to the identification or recognition of a connected motor. This fault can arise due to various reasons, such as incorrect motor parameters, faulty sensors, wiring issues, or compatibility problems.

Here's how to address an Identification Fault:

1. Verify Motor Parameters: Ensure that the motor parameters configured in the drive match the specifications of the connected motor. Check parameters such as rated voltage, current, speed, power factor, and motor type. Incorrect motor parameters can lead to identification faults.

2. Check Motor Wiring: Inspect the wiring connections between the motor and the drive. Ensure that all connections are secure, properly terminated, and free from damage. Wiring issues such as loose connections or broken wires can interfere with motor identification.

3. Review Sensor Feedback: If the motor is equipped with feedback devices such as encoders or resolvers, verify their operation. Faulty feedback devices can result in inaccurate speed or position feedback, leading to identification faults. Check for proper installation and wiring of sensors.

4. Assess Compatibility: Ensure that the motor is compatible with the drive and that it meets the drive's requirements for voltage, current, frequency, and power rating. Mismatched components or incompatible motors can cause identification faults.

5. Perform Auto-Tuning: Some motor drives feature auto-tuning capabilities that automatically identify motor parameters during startup. Initiate the auto-tuning procedure according to the manufacturer's instructions to recalibrate motor parameters and resolve identification faults.

6. Reset Drive Parameters: Try resetting the drive parameters to their factory defaults. This can help clear any incorrect or corrupted settings that may be causing identification faults. Refer to the drive's user manual for instructions on how to perform a parameter reset.