Cause: Internal Error 2 comes when the power board is incompatible with the control block software. The cause of this fault is a mismatch between the hardware "power board" and the software "control block" components of your system. 

"inF2" Internal Error 2 fault in Schneider ATV950 drive indicate a mismatch between the power board and the control block software. This means the power board might have been designed for a different system or have incorrect specifications.

Here’s a detailed approach to troubleshoot and resolve this issue:

1. Identify Current Firmware and Software Versions:

• Check Firmware: Determine the firmware version currently installed on the control block.
• Check Power Board Version: Identify the version or model of the power board installed.

2. Consult Documentation:

• Compatibility Charts: Refer to the ATV950 user manual or Schneider Electric’s official documentation for compatibility charts between control block software versions and power board models.
• Release Notes: Review the release notes for the control block firmware to identify any noted compatibility issues with specific power board versions.

3. Update Control Block Firmware:

• Download Latest Firmware: Obtain the latest firmware for the control block from Schneider Electric’s official website.
• Update Procedure: Follow the correct procedure to update the firmware, ensuring the process is uninterrupted.

4. Verify Power Board Compatibility:

• Compare Versions: Ensure that the power board version is compatible with the updated control block firmware.
• Firmware Update for Power Board: If the power board requires a firmware update, follow Schneider Electric’s procedure to update it.

5. Reinstallation and Reconfiguration:

• Reinstall Boards: Ensure that the power board and control block are correctly installed and seated properly.
• Factory Reset: Perform a factory reset on the drive to clear any residual configuration issues.
• Reconfigure Drive: After the reset, reconfigure the drive settings as per your application requirements.

6. Check for Hardware Faults:

• Inspect Boards: Physically inspect both the control block and power board for any signs of damage or defects.
• Connections: Ensure that all connections between the control block and power board are secure and free from corrosion or damage.