Power unit: Internal overtemperature

What does A05003 mean?

This alarm signifies that the internal temperature within a chassis power unit has reached its alarm threshold. If the temperature increases by an additional 5 K, it will escalate to fault F30036, leading to a shutdown. It's crucial to address this to prevent potential damage and ensure continued operation.

• Restricted cooling airflow due to dust accumulation on heat sinks, blocked ventilation openings, or dirty air filters.
• Ambient temperature inside the control cabinet exceeding the drive's specified maximum operating temperature (e.g., above 50°C).
• Reduced performance or partial failure of an internal cooling fan (e.g., decreased RPM, bearing noise) leading to inadequate heat dissipation.
• Continuous operation at or above the drive's rated output current (P0307) for extended periods without sufficient cooling margin.
• Improper control cabinet design leading to re-circulation of hot air or insufficient overall cabinet ventilation.

Click steps to track your progress.

1. 1

   Monitor the drive's internal temperature sensors (e.g., r0035 for IGBTs, r0036 for heat sink) via diagnostics.

2. 2

   Inspect and thoroughly clean the power unit's heat sink fins, air intake vents, and air filters using dry compressed air.

3. 3

   Verify the actual ambient temperature inside the control cabinet using a calibrated thermometer; improve cabinet ventilation if necessary.

4. 4

   Check the operating speed (e.g., r0032) and audible performance of the internal cooling fans for any signs of degradation.

5. 5

   Reduce the drive's output load (e.g., via P1082) or adjust application cycle times to lower average current (r0027).