Fan cooling

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The cooling fan of the AC drive failed to start when a run command was issued. This indicates a potential fan motor failure, wiring issue, or a problem with the drive's internal fan control circuit. Without proper cooling, the drive will quickly overheat and trip, potentially leading to damage to internal power components.

• Failure of the internal cooling fan motor (e.g., seized bearings, open winding).
• Disconnection or damage to the fan's power cable or control signal wiring within the drive.
• Faulty fan control circuit on the drive's power board or control board failing to supply power to the fan.
• Blocked airflow to the fan preventing proper rotation or triggering an obstruction sensor.

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1. 1

   Visually inspect the drive's cooling fan(s) for physical damage, debris obstruction, or signs of slow rotation when a run command is active.

2. 2

   Measure voltage at the fan's power terminals (if accessible) when a run command is issued, comparing it to the fan's rated voltage (e.g., 24VDC, 48VDC, 230VAC).

3. 3

   Check continuity of the fan's power and control wiring from the fan connector to the main board connection points.

4. 4

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

5. 5

   If the fan motor appears functional but does not receive power, a replacement of the drive's control or power board may be required, as the fan control circuit is faulty.