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.

Complete Troubleshooting Guide

1. 1

   Check the wiring and connections of the 4-20 mA input signal to ensure continuity and secure terminals.

2. 2

   Verify the source of the 4-20 mA signal (e.g., sensor, PLC analog output) for proper operation and output current.

3. 3

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