Power unit: Unknown alarm

What does A30999 mean?

This alarm indicates that an event occurred on the power unit which the Control Unit firmware cannot interpret. This typically happens when the power unit has newer firmware than the Control Unit, leading to unrecognized alarm codes. While not immediately critical, it signifies a firmware version mismatch that can obscure actual issues. The risk is that critical alarms might go uninterpreted, leading to delayed troubleshooting or missed underlying problems with the drive.

• Firmware mismatch: The power unit has a newer firmware version than the connected control unit, leading to unrecognized status messages.
• Corrupted communication data packet between the power unit and control unit over the internal drive bus (e.g., DRIVE-CLiQ), causing misinterpretation.
• Intermittent internal communication bus fault (e.g., loose connector, impedance mismatch) preventing proper data exchange between drive components.
• Unexpected internal status or diagnostic event within the power unit that is not defined in the control unit's firmware event table.

Click steps to track your progress.

1. 1

   Compare the firmware versions of the power unit and the control unit using the drive commissioning software (e.g., STARTER, TIA Portal).

2. 2

   If a firmware mismatch is identified (power unit newer), update the control unit firmware to match or exceed the power unit version.

3. 3

   Perform a drive system reset by cycling power to both the control unit (e.g., 24VDC) and the power unit (e.g., 400VAC) simultaneously.

4. 4

   Check all internal communication cables (e.g., DRIVE-CLiQ cables) between the power unit and control unit for secure connections and proper seating.

5. 5

   Verify parameter P0970 (Power unit type) in the control unit is correctly configured to match the installed power unit hardware.

6. 6

   Log the alarm value (r0949) if available, and consult the manufacturer's technical documentation for any unlisted alarm interpretations.