Undertorque Detection 2

What does UL4 mean?

Similar to UL3, this fault indicates the drive's output current was below the L6-05 threshold for longer than L6-06, with L6-04 set for undertorque detection. It signifies a motor running under an unexpectedly light load condition, potentially indicating a process issue or mechanical failure that needs investigation.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Ensure the motor is operating correctly and is not experiencing internal issues contributing to low current draw.