Code

Name

Causes

Possible Solutions

UL4

Undertorque Detection 2

A fault occurred on the machine.

Example: There is a broken pulley belt.

Examine the machine and remove the cause of the fault

The parameters are incorrect for the load.

Adjust L6-05 [Torque Detection Level 2] and L6-06 [Torque Detection Time 2].
Note:

  • The drive detects this error if the drive output current is less than the level set in L6-05 for longer than L6-06.

  • If the drive detects this error, the terminal set to H2-01 to H2-03 = 10 [MFDO Function Selection = Alarm] will activate.

  • Set the conditions that trigger the minor fault using L6-04 [Torque Detection Selection 2].