4-20mA loss

What does LFF mean?

This fault indicates a loss of the 4-20 mA current signal, which is typically used for speed reference, feedback, or other control inputs. This can be due to a broken wire, sensor failure, or a disconnected control device. Without a valid 4-20 mA signal, the drive may operate erratically, stop, or use a fallback value, leading to loss of critical control or incorrect motor speed.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Ensure the 4-20 mA input settings and thresholds in the drive configuration are correct and match the application requirements.