11 Troubleshooting
SMA Solar Technology AG
Operating manual
STP3-6-3AV-40-BE-en-13
74
Event number
Message, cause and corrective measures
301
Grid fault
The ten-minute average value of the grid voltage is no longer within the per-
missible range. The grid voltage or grid impedance at the connection point is
too high. The inverter disconnects from the utility grid to maintain power qual-
ity.
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 Service.
302
Active power limit AC voltage
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.
401
404
Grid fault
The inverter has disconnected from the utility grid. A stand-alone grid or a very
large change in the power frequency was detected.
Corrective measures:
• Check the grid connection for significant short-term frequency fluctuations.
Summary of Contents for STP3.0-3AV-40
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