57

AMA internal fault

Danfoss · VLT HVAC-FC 102 Frequency Converter

What does 57 mean?

An internal fault occurred during the Automatic Motor Adaptation (AMA) process. This indicates a problem within the drive's control logic or measurement system during motor characterization. Repeated attempts could overheat the motor, and the underlying fault needs to be addressed.

Complete Troubleshooting Guide

  1. 1

    Attempt to restart AMA again; however, closely monitor the motor temperature if restarting multiple times.

  2. 2

    If the fault persists after a second attempt, contact your Danfoss supplier or service department, as it may indicate a deeper drive issue.

Source: Danfoss Manual