Cause : DC link overvoltage comes when the voltage in the drive's DC link circuit has exceeded safe limits. The main power supply to the drive might be exceeding the rated voltage.

"f0002" siemens micromaster 440 indicate "DC link overvoltage" condition. This means the voltage supplied to the drive exceeds its rated maximum voltage. This can lead to a number of issues, including damage to the drive and connected equipment.

Troubleshooting Steps:

1. Check Input Voltage: Verify that the supply voltage matches the drive’s rated voltage. Use a multimeter to measure the actual voltage and compare it with the drive’s specifications.
2. Inspect Wiring: Ensure all connections are secure and free of damage. Check both the power supply and motor connections.
3. Verify Configuration: Review and confirm that the drive’s voltage settings and parameters are correctly configured. Refer to the user manual for proper settings.
4. Examine Braking Resistor: If the drive is configured with a braking resistor, check if it’s functioning correctly and not overloaded.
5. Check for Transients: Look for any sources of voltage spikes or transients in the system and address them if possible. Surge protectors might be needed.