F30002 fault in Siemens V70 Drive indicates a DC link overvoltage. This means the internal DC bus voltage spiked too high, typically caused by rapid motor deceleration regenerating too much energy back into the drive.
Cause: The power unit has detected overvoltage in the DC link.
- Motor regenerates too much energy.
- Device connection voltage too high.
- Line phase interrupted.
Remedy:
- Increase the ramp-down time.
- Activate the DC link voltage controller.
- Use a braking resistor.
- Increase the current limit of the infeed or use a larger module.
- Check the device supply voltage.
- Check the line supply phases.
