12 Troubleshooting
SMA Solar Technology AG
Operating Manual STPx0-3SE-40-BE-en-10 93
Event number Message, cause and corrective measures
501
502
503
Grid incident
The grid frequency is not within the permissible range. The inverter has discon-
nected 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.
601
Grid incident
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.
901
Grounding connection missing > Check connection
The grounding conductor is not correctly connected.
Corrective measures:
• Ensure that the grounding conductor is correctly connected.
1302
Waiting for grid voltage > Installation failure grid connection > Check
grid and fuses
L or N not connected.
Corrective measures:
• Ensure that L and N are connected.
• Ensure that the miniature circuit breaker is switched on.
• Ensure that the AC cable is not damaged and that it is connected
correctly.
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