Inverter overload

What does ALARM 9 mean?

The frequency converter has been operating with more than 100% overload for too long, triggering a warning at 98% and an alarm at 100%. The unit will trip, and cannot be reset until the internal thermal counter falls below 90%. Prolonged overload can severely damage the inverter's power components.

• Motor or application load exceeding the frequency converter's continuous current rating (e.g., >100% of P1-05 Motor A).
• Incorrect frequency converter sizing for the connected motor and application's duty cycle.
• Motor current parameters (e.g., P1-05 Motor A) incorrectly set, leading to an inaccurate thermal model.
• High ambient temperature around the frequency converter, reducing its continuous current capacity.
• Blocked or restricted cooling fan/heatsink on the frequency converter, preventing adequate heat dissipation.

Click steps to track your progress.

1. 1

   Monitor the output current (parameter 16-10 Output Current) and load percentage (parameter 16-16 Load % on converter) during operation.

2. 2

   Verify the frequency converter's continuous current rating against the maximum operating current of the application.

3. 3

   Check ambient temperature around the frequency converter enclosure and ensure it is within the specified operating limits.

4. 4

   Inspect the frequency converter's cooling fan for obstruction or failure and clean heatsink fins if dusty.

5. 5

   Review motor data parameters (P1-03 Motor kW, P1-04 Motor V, P1-05 Motor A, P1-06 Motor cos phi) to ensure accurate motor model.

6. 6

   Reduce the mechanical load on the motor or consider oversizing the frequency converter if overload persists.