A30031 alarm in Siemens V70 Drive indicates Hardware current limiting in phase U. This means the drive detected a critical current peak in one of the motor phases and temporarily paused output pulses to protect the transistors.
Cause: Hardware current limit for phase U responded. The pulsing in this phase is inhibited for one pulse period.
- Closed-loop control is incorrectly parameterized.
- Fault in the motor or in the power cables.
- The power cables exceed the maximum permissible length.
- Motor load too high.
- Power unit defective.
Remedy: Check the motor data. As an alternative, run a motor data identification.
- Check the motor circuit configuration (star-delta).
- Check the motor load.
- Check the power cable connections.
- Check the power cables for short-circuit or ground fault.
- Check the length of the power cables.
