Internal Fault

What does InF mean?

This fault indicates an internal malfunction within the drive controller, potentially stemming from environmental electromagnetic interference or an improper connection/disconnection of the local control option while powered. Ignoring this can result in total drive failure and loss of control.

• Excessive electromagnetic interference (EMI) disrupting internal drive logic (e.g., unshielded power cables near control wiring).
• Improper connection or disconnection of control panel/HMI while drive is powered, corrupting configuration.
• Transient voltage spike or sag on the control power supply (e.g., 24VDC) causing CPU instability.
• Corrupted firmware or configuration data due to power interruption during write cycles.
• Internal sensor fault (e.g., current, voltage, temperature sensor) providing erroneous data to the controller.

Click steps to track your progress.

1. 1

   1. Cycle drive power (turn off, wait 30 seconds, turn on) to clear transient conditions.

2. 2

   2. Verify control wiring shielding is properly terminated at the drive ground terminal and not at both ends (ground loop).

3. 3

   3. Measure incoming control power supply (e.g., 24VDC) stability with an oscilloscope for voltage dips or spikes.

4. 4

   4. Perform a factory reset (e.g., Parameter P9-01 = 1) to clear corrupted configuration, then re-enter essential motor parameters.

5. 5

   5. Check for loose internal connections by physically inspecting the drive's control board connections.