11 Troubleshooting
SMA Solar Technology AG
Operating manual STPxx-US-50-BE-en-11 75
11.1.8 Event 404
Event message:
• Grid incident
Explanation:
The inverter has disconnected from the utility grid. A stand-alone grid or a very large change in the
grid frequency was detected.
Corrective measures:
• Make sure there is no power outage or work being done on the utility grid and contact a grid
operator if necessary.
• Check the grid connection for significant short-term frequency fluctuations.
11.1.9 Event 501
Event message:
• Grid incident
Explanation:
The grid frequency is not within the permissible range. The inverter has disconnected from the utility
grid.
Corrective measures:
• If possible, check the grid frequency and observe how often fluctuations occur.
If fluctuations occur frequently and this message is displayed often, contact the grid operator
and request approval to change the operating parameters of the inverter.
If the grid operator gives his approval, discuss any changes to the operating parameters with
the Service.
11.1.10 Event 507
Event message:
• Active power limit AC frequency
Explanation:
The inverter has reduced its power due to a too-high grid frequency to ensure grid stability.
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