Event 501 — Grid fault, power frequency out of range

What does 501 mean?

The inverter has disconnected from the utility grid because the power frequency is not within the permissible range. This is a protective measure to ensure stable operation and grid quality.

• Power frequency fluctuations that exceed the permissible range.
• Local grid conditions affecting frequency stability.

Click steps to track your progress.

1. 1

   If possible, check the power frequency and observe how often fluctuations occur.

2. 2

   If fluctuations occur frequently and this message is displayed often, contact your grid operator.

3. 3

   If the grid operator gives approval, discuss any necessary changes to the inverter's operating parameters with SMA Service.