SMA SUNNY BOY 240 Instruction Manual page 60

11 Troubleshooting
Event Event, cause and corrective measures
number
202 Grid fault / Grid undervoltage fast (202)
The utility grid has been disconnected, the AC cable is damaged or the line voltage at
the connection point of the inverter is too low. The inverter has disconnected from the
utility grid.
Corrective measures:
1. Ensure that the circuit breaker is switched on.
2. Ensure that the AC cable is not damaged.
3. Ensure that the AC cable is correctly connected.
4. Check whether the line voltage at the connection point of the inverter is
permanently in the permissible range.
If the line voltage is outside the permissible range due to local grid conditions,
contact the grid operator. The grid operator must approve changes to the
operating parameters of the inverter.
If the line voltage is permanently within the permissible range and this message is
still displayed, contact the SMA Service Line.
301 Grid fault / Voltage increase protection (301)
The line voltage or grid impedance at the connection point of the inverter is too high.
The inverter has disconnected from the utility grid to comply with the power quality.
Corrective measures:
• Check whether the line voltage at the connection point of the inverter is
permanently in the permissible range.
If the line voltage is outside the permissible range due to local grid conditions,
contact the grid operator. The grid operator must approve changes to the
operating parameters of the inverter.
If the line voltage is permanently within the permissible range and this message is
still displayed, contact the SMA Service Line.
401 Grid fault / Island grid (401)
The inverter is no longer in grid parallel operation and has stopped feed-in operation
for safety reasons.
Corrective measures:
• Check the grid connection for significant, short-term frequency fluctuations.
60 SMG-SB240-IA-en-11
SMA Solar Technology AG
Installation Manual