SMA SUNNY BOY 240 Instruction Manual page 58

11 Troubleshooting
Event Event, cause and corrective measures
number
6406 DC overcurrent / Overcurrent input A (HW) (6406)
The current at the module input of the inverter is too high. The inverter has interrupted
the feed-in operation.
Corrective measures:
• Check whether the line voltage at the connection point of the inverter is
permanently in the permissible range and/or whether voltage jumps occur
(e.g. by switching on and off large loads).
If voltage jumps occur or 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.
6415 Self diagnosis / Interference device (6305)
The cause must be determined by the SMA Service Line.
Corrective measures:
• Contact the SMA Service Line.
6450 Self diagnosis / Energy transfer not possible / Interference device (6450)
The inverter cannot feed into the utility grid. Possible causes: line voltage is too high;
a PV module is defective, soiled or shaded; a cloudy or foggy day.
Corrective measures:
1. 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.
2. Check whether the DC voltage is stable in a realistic range in accordance with the
datasheet of the PV module and the assessment of the weather situation.
Therefore, determine the voltage during inverter operation using a communication
product.
3. Check whether the respective PV module is heavily soiled or shaded.
Clean the PV module if soiled.
4. During a very cloudy or foggy day, wait for higher irradiation.
5. If none of the described causes is applicable and the message is still displayed,
contact the SMA Service Line.
58 SMG-SB240-IA-en-11
SMA Solar Technology AG
Installation Manual