56

AMA interrupted by user

Danfoss · VLT HVAC Drive High Power

What does 56 mean?

The Automatic Motor Adaptation (AMA) routine was manually interrupted before completion. This means the drive did not fully characterize the motor, and subsequent operation may not be optimized.

Common Causes

  • A manual stop command was issued to the drive during the AMA routine (e.g., via digital input, control panel).
  • The drive's power supply was interrupted or cycled during the AMA process.
  • An emergency stop (E-stop) or safety interlock was activated while AMA was running.
  • An external control system (PLC/DCS) sent a premature stop signal to the drive.
  • Drive input signal (e.g., for run/stop) was inadvertently toggled during AMA.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    1. Ensure no stop commands or emergency stop signals are active before initiating AMA (check DI status in monitoring menu).

  2. 2

    2. Verify stable and continuous power supply to the drive throughout the AMA process (monitor line voltage).

  3. 3

    3. Initiate AMA again and allow it to complete without any user intervention or external control actions.

  4. 4

    4. Check the configuration of digital inputs (e.g., P5-10 to P5-15) to ensure no unintended stop functions are active.

  5. 5

    5. If an external controller is used, review its logic to confirm it does not send stop commands prematurely during AMA.

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Verified technical data. Last updated: March 2026

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Source: Danfoss VLT HVAC Drive High Power