11 Troubleshooting
SMA Solar Technology AG
Operating manualSTPxx-US-50-BE-en-1174
Explanation:
The ten-minute average value of the grid voltage is no longer within the permissible range. The grid
voltage or grid impedance at the connection point is too high. The inverter disconnects from the
utility grid to maintain power quality.
Corrective measures:
• During the feed-in operation, check whether the grid voltage at the connection point of the
inverter is permanently in the permissible range.
If the grid voltage is outside the permissible range due to local grid conditions, contact the grid
operator. The grid operator must agree with an adjustment of the voltage at the feed-in point
or with a change of the monitored operating limits.
If the grid voltage is permanently within the permissible range and this message is still
displayed, contact the Service.
11.1.6 Event 302
Event message:
• Active power limit AC voltage
Explanation:
The inverter has reduced its power due to a too-high grid voltage to ensure grid stability.
Corrective measures:
• If possible, check the grid voltage 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.
11.1.7 Event 401
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.
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