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] settings.
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 detected, the terminal assigned to H2-01 to H2-04 = 10 [MFDO Function Select = Alarm] will be ON.

  • If the drive detects this error, it will operate the motor as specified by the Stopping Method set in L6-04 [Torque Detection Selection 2].