QuestionsCategory: ConsultingWhat is the Faulty Grid from SMA inverter’s screen mean?
Cris asked 2 years ago

What is the Faulty Grid from SMA inverter’s screen mean?

1 Answers
admin answered 2 years ago

Grid fault

The grid voltage or grid impedance at the connection point of the inverter is
too high. The inverter has disconnected from the utility grid.
Corrective measures:
• 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. Ask the grid operator whether the
voltage can be adjusted at the feed-in point or request approval to
change the monitored operating limits.
If the grid voltage is permanently within the permissible range and this
message is still displayed, contact the SMA Service Line.
202 to 203
Grid fault
The utility grid has been disconnected, the AC cable is damaged or the grid
voltage at the connection point of the inverter is too low. The inverter has disconnected from the utility grid.
Corrective measures:
• Make sure that the circuit breaker is switched on.
• Make sure that the AC cable is not damaged.
• Make sure that the AC cable is correctly connected.
• 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. Ask the grid operator whether the
voltage can be adjusted at the feed-in point or request approval to
change the monitored operating limits.
If the grid voltage is permanently within the permissible range and this
message is still displayed, contact the SMA Service Line.
SMA Solar Technology AG 10 Troubleshooting
Service Manual STP5-12TL-20-SG-en-12 21

Event number Display message, cause and corrective measures
301 Grid fault
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 comply with the power
quality.
Corrective measures:
• 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. Ask the grid operator whether the
voltage can be adjusted at the feed-in point or request approval to
change the monitored operating limits.
If the grid voltage is permanently within the permissible range and this
message is still displayed, contact the SMA Service Line.
401 to 404
Grid fault
The inverter is no longer in grid-parallel operation. The inverter has stopped
feeding into the utility grid.
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 disconnected 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 SMA Service Line.
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.