4-20 mA loss

What does LFF mean?

This fault indicates a loss of the 4-20 mA analog input signal, which is typically used for speed reference or process feedback. This can occur even if the [4-20mA loss] (LFL) parameter is set to [No] (nO) on page 95.

• Disconnection or break in the 4-20 mA analog input wiring.
• Malfunction of the device providing the 4-20 mA signal.
• Incorrect wiring or configuration of the 4-20 mA input.

Click steps to track your progress.

1. 1

   Measure the 4-20 mA signal directly at the drive's analog input terminals.

2. 2

   Check the wiring for the 4-20 mA analog input for continuity and correct connections.

3. 3

   Verify the settings of the analog input parameters.