Undertorque Detection 2

What does UL4 mean?

This fault triggers when the drive's output current falls below the level set in L6-05 for longer than the time specified in L6-06. Similar to UL3, it's often caused by a machine problem like a broken pulley belt or misconfigured load parameters. Ignoring this can result in undetected mechanical problems, operational inefficiencies, or unexpected stops.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Execute a Fault Reset to clear the fault from the drive's memory after troubleshooting.