57

AMA internal fault (Persistent)

Danfoss · VLT HVAC Drive High Power

What does 57 mean?

An internal fault occurred during the Automatic Motor Adaptation (AMA) process. While a single occurrence might be transient, repeated occurrences suggest a more persistent issue within the drive's control logic or its interaction with the motor, potentially heating the motor due to repeated attempts.

Complete Troubleshooting Guide

  1. 1

    Attempt to restart the AMA process.

  2. 2

    If the fault persists after multiple attempts, ensure all motor data (parameters 1-20 to 1-25) is accurate and motor connections are secure.

  3. 3

    Consider the possibility of motor or drive hardware issues if the fault recurs consistently.