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Siemens SINUMERIK Controller
Overheat/Thermal · Intermediate · 30-120 minutes
Siemens 840D 300515 - Axis drive power section heat sink temperature exceeded
Siemens SINAMICS drive alarm 300515: Axis drive power section heat sink temperature exceeded. The drive module has exceeded its thermal limit. The drive is shutting down to prevent permanent damage from overheating.
300515
Siemens 840D 300515 - Axis drive power section heat sink temperature exceeded
Axis drive power section heat sink temperature exceeded
Siemens SINAMICS drive alarm 300515: Axis drive power section heat sink temperature exceeded. The drive module has exceeded its thermal limit. The drive is shutting down to prevent permanent damage from overheating.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Common Causes
- Drive module cooling fan failure or reduced airflow
- Cabinet air filter blocked restricting airflow
- Ambient temperature in the drive cabinet above rated limit
- Continuous heavy duty cycle without thermal recovery
- Drive module heatsink fins clogged with dust or debris
Troubleshooting Steps
- 1Check cooling fans — confirm all fans are spinning and delivering airflow.
- 2Inspect and clean or replace cabinet air filters.
- 3Allow machine to cool for 20-30 minutes before restarting.
- 4Monitor cabinet ambient temperature and verify it is within drive specification.
- 5Clean heatsink fins on the drive module with compressed air.
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Always verify with your machine manual or a certified technician before performing service procedures.