VFD Heatsink Overtemperature

Drive heatsink temperature exceeded safe limit. Internal thermal protection activated to prevent component damage.

Probable Causes (ranked)

• Cooling fan failed — check if fan spins freely and runs when drive is powered
• Heatsink fins clogged with dust/debris — restrict airflow
• Ambient temperature too high — drive enclosure in direct sun or near heat source
• Drive overloaded continuously — running above rated current for extended time
• Ventilation inadequate — insufficient clearance above and below drive

Fix Steps

1. 1 Check cooling fan operation — spin by hand, verify power to fan
2. 2 Clean heatsink fins with compressed air — blow from inside out
3. 3 Verify ambient temp is within drive spec (typically 40°C/104°F max)
4. 4 Check motor current vs drive rating — derate if ambient >40°C
5. 5 Ensure minimum clearances: typically 6" top/bottom, 2" sides
6. 6 Replace fan if bearings are noisy or rotation is sluggish
7. 7 If in enclosed panel, add cabinet cooling fan or A/C unit

Suggested Replacement Parts

Parts matched to fault category: Vfd Drive

Prices are estimates. Verify part numbers match your equipment before ordering.

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