Cause : Internal Fan Fault comes when he internal circulation fan in the regenerative unit is faulty or an internal circulation fan is faulty.

• Cycle power to the drive.
• Check for fan operation.
• Verify the cumulative operation time of the fan with monitor U4-03, and verify the cumulative operation time of the fan maintenance timer with U4-04.
• If the cooling fan has exceeded its expected performance life or is damaged in any other way, replace the fan.

Fault detected in the internal cooling fan or magnetic contactor to the power supply.
• Cycle power to the drive.
• If the fault continues to occur, replace the power board/gate drive board or the entire drive.