Code

Name

Causes

Possible Solutions

LF

Output Phase Loss

The motor main circuit cable is disconnected.

Connect motor main circuit cable wiring. Correct wiring errors in the main circuit drive input power.

There is a disconnection in the motor coil winding.

If a coil is disconnected, measure the motor Line-to-Line Resistance and replace the motor.

The screws on the drive output terminals are loose.

Tighten the terminal screws to the correct tightening torque.

The rated output current of the motor is less than 5% of the drive rated current.

Examine the drive capacity or the motor output to be applied.

You are trying to use a single-phase motor.

The drive cannot operate a single-phase motor.

The output transistor in the drive is damaged.

  • 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.
Note:

  • The drive detects this fault if phase loss occurs on the output side of the drive.

  • Do a Fault Reset to clear the fault.

  • Set L8-07 [Output Phase Loss Protection Sel] to enable and disable LF detection.