12 Troubleshooting
SMA Solar Technology AG
Operating manual
SB55-LV-JP-41-BE-en-13
68
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.
404
Frequency change not permitted
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 the Service.
507
Active power limit AC frequency
The inverter has reduced its power due to a too-high power frequency to en-
sure grid stability.
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
the Service.
