Process Underload Fault (Torque)

What does ULF mean?

A torque underload detected fault. This indicates that the motor is operating with significantly less load than expected, potentially pointing to a mechanical failure (e.g., broken belt, pump cavitation) or a material flow issue. While not immediately damaging, it signals an abnormal process condition.

Complete Troubleshooting Guide

1. 1

   Inspect the mechanical system for any broken components (e.g., belts, couplings) or disconnections.

2. 2

   Check the process for a loss of material, fluid, or abnormal operating conditions (e.g., pump dry run).

3. 3

   Verify the underload threshold parameter in the drive configuration.

4. 4

   Ensure the motor is correctly sized for the application, and the expected load is present.