61

Feedback error

Danfoss · VLT HVAC Drive High Power

What does 61 mean?

An inconsistency has occurred between the calculated motor speed and the speed measurement received from the feedback device (e.g., encoder). This indicates a potential issue with the feedback device, its wiring, or the drive's speed calculation, which can lead to unstable speed control or unexpected motor behavior.

Additional Steps

Steps 1–2 are listed in Priority Fix.

  1. 3

    Inspect the feedback device itself for functionality and accuracy.

  2. 4

    Ensure the motor feedback is correctly configured, especially during commissioning.

Source: Danfoss VLT HVAC Drive High Power
View Official PDF