Fan alarm

¿Qué significa FN ?

This fan alarm appears on the operation panel when the cooling fan stops due to an alarm condition or operation inconsistent with the Pr. 244 (Cooling fan operation selection) setting. This alarm indicates a potential overheating risk, as adequate cooling is compromised, and the inverter will not trip immediately.

• Cooling fan motor failure (e.g., seized bearings, open winding) preventing it from rotating.
• Accumulation of dust and debris blocking the fan blades or air vents, leading to reduced airflow and potential overheating, causing the fan to trip.
• Incorrect setting of parameter Pr. 244 (Cooling fan operation selection), causing the fan to operate outside its normal limits or not at all when required.
• Disconnection or damage to the fan's power supply cable or feedback signal wire (if present) from the main control board.
• High ambient temperature causing the inverter to attempt to run the fan at maximum speed, leading to premature wear or overload trip.

Haga clic en los pasos para seguir su progreso.

1. 1

   1. Visually inspect the inverter's cooling fan(s) for physical damage, obstructions (dust, debris), or signs of the fan not rotating. Clean the fan blades and vents thoroughly.

2. 2

   2. Check the setting of Pr. 244 (Cooling fan operation selection) and ensure it is configured appropriately for the application (e.g., always ON, controlled by temperature, intermittent). Adjust if incorrect.

3. 3

   3. With power OFF and DC bus discharged, check the fan's electrical connections on the PCB for looseness or damage. Measure continuity of the fan motor windings if accessible.

4. 4

   4. If safe and accessible, briefly manually spin the fan blades to check for free movement and absence of binding. If stiff or noisy, replace the fan unit with an OEM replacement.

5. 5

   5. Monitor the inverter's internal temperature (if available via display or communication) to identify if the fan is failing to maintain adequate cooling under load, leading to a thermal shutdown.