Undertorque Detection 2

What does UL4 mean?

This error indicates a mechanical problem, like a broken drive belt, or that the load parameters are incorrectly configured, resulting in the motor drawing less current than expected. The drive detects this when the output current drops below the threshold set in L6-05 for longer than L6-06. Persistent undertorque can signal a serious mechanical malfunction or inefficient operation.

Additional Steps

Steps 1–2 are listed in Priority Fix.

1. 3

   Execute a Fault Reset to clear the error once the fault condition is eliminated.