Cause : Incorrect motor data identification comes when you're encountering a fault related to incorrect motor data on a Siemens SINAMICS G120 drive, it's essential to troubleshoot and rectify the issue promptly to avoid potential damage or downtime. 

A fault has occurred during the identification routine. Fault value (r0949, interpret decimal):
1: Current limit value reached.
2: Identified stator resistance lies outside the expected range 0.1 ... 100% of Zn.
3: Identified rotor resistance lies outside the expected range 0.1 ... 100% of Zn.
4: Identified stator reactance lies outside the expected range 50 ... 500 % of Zn.
5: Identified magnetizing reactance lies outside the expected range 50 ... 500 % of Zn.
6: Identified rotor time constant lies outside the expected range 10 ms ... 5 s.
7: Identified total leakage reactance lies outside the expected range 4 ... 50 % of Zn.
8: Identified stator leakage reactance lies outside the expected range 2 ... 50% of Zn.
9: Identified rotor leakage reactance lies outside the expected range 2 ... 50% of Zn.
10: Motor has been incorrectly connected.
11: Motor shaft rotates.
12: Ground fault detected.
20: Identified threshold voltage of the semiconductor devices lies outside the expected range 0 ... 10 V.
30: Current controller in voltage limiting.
40: At least one identification contains errors. The identified parameters are not saved to prevent inconsistencies.
50: The selected sampling time is too low for the motor identification (p0115[0])

Re fault value = 1 ... 40:

- check whether motor data have been correctly entered in p0300, p0304 ... p0311.

- is there an appropriate relationship between the motor power rating and that of the power unit? The ratio of the power unit to the rated motor current should not be less than 0.5 and not be greater than 4.

- check connection type (star-delta).

Re fault value = 4, 7:

- check whether the inductance in p0233 is correctly set.

- check whether motor has been correctly connected (star-delta).

Re fault value = 11 in addition:

- Deactivate oscillation monitoring (p1909.7 = 1).

For fault value = 12:
- check the power cable connections.
- check the motor.
- check the CT. For fault value = 50:
- Perform a motor data identification with a higher sampling time, and after this, change to the required higher sampling time (p0115[0]).

Here's a structured approach to address this fault:

1. Fault Code Analysis: Determine the specific fault code associated with the incorrect motor data. The fault code displayed on the SINAMICS G120 drive's interface or in the diagnostic logs can provide valuable information about the nature of the problem.

2. Verify Motor Parameters: Check the motor parameters configured in the drive settings. Ensure that the motor data, including voltage, current, power rating, speed, and other relevant parameters, are accurately entered into the drive. Use the parameterization tools provided by Siemens to review and adjust these settings if necessary.

3. Inspect Wiring and Connections: Examine the wiring and connections between the drive, motor, and any external sensors or feedback devices. Loose connections, damaged cables, or incorrect wiring can lead to inaccuracies in motor data readings. Ensure that all connections are secure and properly configured according to the manufacturer's guidelines.

4. Measure Motor Parameters: Use diagnostic tools such as multimeters or clamp meters to measure the actual motor parameters, including voltage, current, speed, and torque. Compare these measurements with the values configured in the drive parameters. Significant discrepancies may indicate incorrect motor data.

5. Check Motor Nameplate: Verify the motor nameplate data to ensure that it matches the information entered into the drive parameters. Any discrepancies between the actual motor specifications and the configured parameters can result in incorrect motor data.

6. Review Documentation and Guidelines: Consult the user manual, technical documentation, and application guidelines provided by Siemens for the SINAMICS G120 drive. These resources may offer specific troubleshooting steps and recommendations for addressing faults related to incorrect motor data.

7. Reset and Reconfigure: If necessary, reset the drive to its default settings and reconfigure the motor parameters from scratch. Ensure that all settings are entered accurately and match the specifications of the connected motor.