Code

Name

Causes

Possible Solutions

PF

Input Phase Loss

There is a phase loss in the drive input power.

Correct errors with the wiring for main circuit drive input power.

There is loose wiring in the drive input power terminals.

Tighten the terminal screws to the correct tightening torque.

The drive input power voltage is changing too much.

  • Examine the input power for problems.

  • Make the drive input power stable.

  • If the input power supply is good, examine the magnetic contactor on the main circuit side for problems.

There is unsatisfactory balance between voltage phases.

  • Examine the input power for problems.

  • Make the drive input power stable.

  • Set L8-05 = 0 [Input Phase Loss Protection Sel = Disabled].

The main circuit capacitors have become unserviceable.

  • Examine the capacitor maintenance time in monitor U4-05 [CapacitorMaintenance]. If U4-05 is more than 90%, replace the control board or the drive. For information about replacing the control board, contact Yaskawa or your nearest sales representative.

  • If drive input power is correct and 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 error if the DC bus voltage changes irregularly without regeneration.

  • Do a Fault Reset to clear the fault.

  • Use L8-05 to enable and disable PF detection.