Code

Name

Causes

Possible Solutions

LF2

Output Current Imbalance

There is phase loss in the wiring on the output side of the drive.

Examine for wiring errors or disconnected wires on the output side of the drive, and repair problems.

The screws on the drive output terminals are loose.

Tighten the terminal screws to a correct tightening torque.

There is not balance between the three phases of the PM motor impedance.

  • Measure the Line-to-Line Resistance for each motor phase and make sure that resistance is equal in the three phases, and that all wires are connected correctly.

  • Replace the motor.

The drive output circuit is broken.

  • Re-energize the drive.

  • If the fault stays, replace the control board or the drive. For information about replacing the control board, contact Yaskawa or your nearest sales representative.

The voltage compensation-related parameters are incorrect.

Set C4-20 = 0 [Voltage Compensation Adjust 1 = 0 Hz].
Note:

  • The drive detects this fault if there is not balance between the three phases of the output current from the PM motor.

  • Do a Fault Reset to clear the fault.