SMA Solar Technology SUNNY BOY 3.0, Operating Manual, Page: 65 / 100

Event number Message, cause and corrective measures
401
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.
501
Grid fault
The power frequency is not within the permissible range. The inverter has dis-
connected from the utility grid.
Corrective measures:
• If possible, check the power 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 Service (see Section 15 "Contact",
page 96).
601
Grid fault
The inverter has detected an excessively high proportion of direct current in
the grid current.
Corrective measures:
• Check the grid connection for direct current.
• If this message is displayed frequently, contact the grid operator and
check whether the monitoring threshold on the inverter can be raised.
12 Troubleshooting SMA Solar Technology AG
Operating Manual 65 SB30-50-1AV-40-BE-en-10