tJF

IGBT Overheating

Schneider Electric · Altivar Machine ATV320 Variable Speed Drive

What does tJF mean?

IGBT overheating detected. This means the temperature of the Insulated Gate Bipolar Transistors in the drive's power stage has exceeded safe limits. This is often caused by heavy loads, high ambient temperatures, or cooling system failure. Prolonged overheating can lead to permanent damage to the IGBTs.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Clean drive heatsinks and ventilation openings to ensure proper airflow.

  2. 4

    Reduce the motor load or operating frequency if persistently high.

Source: Schneider Electric Altivar Machine ATV320 Variable Speed Drive
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