Cause : Undervoltage alarm comes when a problem occurred at the power unit power supply. The voltage monitor in the internal FPGA of the PSA signals an undervoltage fault on the module.

A30046 alarm in siemens 6RA80 DC Drive indicate Undervoltage alarm. This means the input voltage from the power supply is below the minimum required level.

1. Check the 24 V DC voltage supply to power unit.
2. Carry out a POWER ON (power off/on) for the component.
3. Replace the module if necessary.