Undertorque Detection 1

What does UL3 mean?

The drive detected that its output current was continuously below the threshold set in L6-02 for longer than the time specified in L6-03, when L6-01 was configured for undertorque detection. This fault indicates that the connected motor is operating under an unexpectedly low load, potentially due to a mechanical issue or process change.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Check motor current with an external meter to confirm actual load versus drive reading.