Undertorque Detection 1

What does UL3 mean?

This fault indicates that the drive's output current dropped below the level set in L6-02 for longer than the time specified in L6-03. This is typically caused by a mechanical issue like a broken pulley belt, or by incorrect load parameters for the application. Continued undertorque can lead to inefficient operation, unnoticed mechanical failures, or unexpected machine stops.

Complete Troubleshooting Guide

1. 1

   Thoroughly examine the machine for any mechanical failures, such as broken belts, couplings, or load disengagement, and rectify the identified cause.

2. 2

   Review and adjust the L6-02 [Torque Detection Level 1] and L6-03 [Torque Detection Time 1] parameters to accurately reflect the minimum expected load conditions of the application.

3. 3

   Perform a Fault Reset to clear the fault from the drive once the underlying mechanical or parameter issue is resolved.