HdF

IGBT Desaturation

Schneider Electric · Altivar Machine ATV320 Variable Speed Drive

What does HdF mean?

A hardware detected error, specifically related to IGBT desaturation. This indicates a very high voltage drop across an IGBT, often due to a short circuit in the motor or power wiring, or an internal IGBT failure. This is a critical fault that can lead to immediate hardware damage if not addressed.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Check the drive's output terminals for signs of arcing, carbon buildup, or damage.

  2. 4

    If external wiring is verified clear, the drive's power section (IGBTs) may be damaged and require replacement.

Source: Schneider Electric Altivar Machine ATV320 Variable Speed Drive
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