Automatic Motor Tuning Timeout
Danfoss · VLT 2800 Variable Speed Drive
What does 55 mean?
This fault indicates that the Automatic Motor Tuning (AMT) calculations are taking too long to complete, resulting in a timeout. Common causes include excessive electrical noise in the motor cables, which can interfere with measurements, or conditions that prevent the tuning algorithm from converging quickly. An incomplete AMT means the motor will not be optimally characterized for the drive.
Additional Steps
Steps 1–2 are listed in Priority Fix.
- 3
Check for potential sources of electromagnetic interference (EMI) near the drive or motor cables (e.g., contactors, switching devices) and mitigate them.
- 4
If the environment is electrically noisy, consider installing line reactors or output filters, or temporarily relocating noise sources during tuning.