INVERTER COOLING FAN FAILURE

What does 444 n AXIS: INV. COOLING FAN FAILURE mean?

This warning signal on the Fanuc Series 0i-D/0i Mate-D αi servo system indicates a failure of the inverter cooling fan. This condition will lead to an inverter overheat alarm if not addressed, as reported by the servo amplifier (SVWRN4 active).

• Cooling fan motor failure in the inverter unit.
• Obstruction or blockage of the fan's intake or exhaust preventing proper airflow.
• Loose or damaged electrical connection to the inverter cooling fan.

Click steps to track your progress.

1. 1

   Visually inspect the inverter cooling fan for any blockages (e.g., dust, debris) or physical damage to the fan blades.

2. 2

   Check the electrical connection to the fan motor for proper seating and continuity.

3. 3

   Attempt to manually spin the fan blades (with power off) to check for binding or excessive resistance.

4. 4

   Verify the fan's operation by observing rotation during system power-on (if safe to do so).

5. 5

   If the fan is confirmed to be faulty or non-operational, replace the inverter cooling fan unit.